Initial commit: OpenClaw Mattermost Extension

.github/workflows/ci.yml

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+name: CI/CD Pipeline
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main, develop]
+  workflow_dispatch:
+    inputs:
+      publish:
+        description: 'Publish to npm'
+        required: true
+        default: false
+        type: boolean
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run linter
+        run: npm run lint
+
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: ['22']
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test
+
+      - name: Upload coverage to Codecov
+        if: matrix.node-version == '22'
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: ./coverage/lcov.info
+          fail_ci_if_error: false
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    needs: [lint, test]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build project
+        run: npm run build
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: build-files
+          path: dist/
+          retention-days: 7
+
+  security:
+    name: Security Audit
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run npm audit
+        run: npm audit --audit-level=moderate
+
+      - name: Run Snyk security scan
+        if: env.SNYK_TOKEN != ''
+        uses: snyk/actions/node@master
+        continue-on-error: true
+        env:
+          SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
+
+  publish:
+    name: Publish to npm
+    runs-on: ubuntu-latest
+    needs: [build]
+    if: github.event.inputs.publish == 'true'
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: 'npm'
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build project
+        run: npm run build
+
+      - name: Publish to npm
+        run: npm publish --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

.gitignore

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+# Node.js
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.pnpm-debug.log*
+
+# Build outputs
+dist/
+build/
+*.tsbuildinfo
+
+# Testing
+coverage/
+.nyc_output/
+
+# Environment
+.env
+.env.local
+.env.*.local
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Logs
+logs/
+*.log
+
+# Temporary files
+tmp/
+temp/
+*.tmp
+.sisyphus/
+.sisyphus/
+**/.sisyphus/

.npmignore

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+# Source files (only dist/ should be published)
+extensions/
+
+# Test files
+*.test.ts
+*.test.tsx
+*.spec.ts
+*.spec.tsx
+*.test.js
+*.test.jsx
+*.spec.js
+*.spec.jsx
+
+# Test directories
+tests/
+test/
+__tests__/
+coverage/
+
+# Development files
+.sisyphus/
+.github/
+.vscode/
+.idea/
+
+# Config files (not needed in production)
+playwright.config.ts
+vitest.config.ts
+vitest.config.*
+tsconfig.json
+eslint.config.js
+.eslintrc*
+.prettierrc*
+
+# Build artifacts (keep dist/ but not these)
+*.tsbuildinfo
+
+# Documentation (keep README, but not these)
+docs/
+
+# CI/CD
+.github/workflows/
+
+# Logs
+*.log
+npm-debug.log*
+
+# OS files
+.DS_Store
+Thumbs.db

.openclawignore

@@ -0,0 +1,5 @@
+tests/
+test-results/
+.sisyphus/
+src/
+extensions/mattermost/src/**/*.test.ts

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security
+
+## [1.0.0] - 2026-04-10
+
+### Added
+
+- **PAT (Personal Access Token) Support**: Dual token authentication with bot token for reads and PAT for writes
+- **Message Editing**: Edit bot messages with permission controls via `editMessage()` action
+- **Message Deletion**: Delete bot messages with safety checks via `deleteMessage()` action
+- **File Download**: Secure file download with MIME type validation, executable blocking, and size limits
+- **Interactive Directives**: Support for `[[mattermost_buttons: ...]]` and `[[mattermost_select: ...]]` syntax
+- **Security Audit**: Automated security configuration scanning with `collectMattermostSecurityAuditFindings()`
+- **Structured Error Handling**: Comprehensive error classes with context, retry logic, and user-friendly messages
+- **Automatic Retry Logic**: Exponential backoff with jitter for transient failures
+- **Rate Limit Handling**: Full support for Mattermost rate limiting with `Retry-After` header parsing
+- **SSRF Protection**: Guarded outbound requests with `fetchWithSsrFGuard`
+- **Multi-Account Support**: Configure multiple Mattermost accounts with `accounts` and `defaultAccount`
+- **Advanced Slash Commands**: Native and skill-based commands with callback configuration
+- **DM Channel Retry**: Configurable retry logic for DM channel creation
+- **Error Boundary**: Global error handling with `globalErrorBoundary`
+- **Group-Specific Settings**: Per-channel configuration via `groups` object
+
+### Security
+
+- HTTPS enforcement warnings for insecure configurations
+- IP allowlisting for interaction callbacks
+- Private network access controls
+- Hardcoded token detection in security audit
+- Mutable allowlist entry detection
+- Executable file blocking in downloads
+- Input validation for all user-provided parameters
+
+### Changed
+
+- Improved error messages with context and remediation hints
+- Enhanced configuration validation with Zod schemas
+- Better separation of concerns in client architecture
+- More comprehensive logging without exposing secrets
+
+## [0.1.0] - 2026-04-10
+
+### Added
+
+- Initial release of open-source
+- TypeScript support
+- Basic filtering functionality for OpenCode
+- Mattermost integration support
+- Development tooling (Vitest, TypeScript)
+
+[Unreleased]: https://github.com/lumbridgecorp/openclaw-extentions-mattermost/compare/v1.0.0...HEAD
+[1.0.0]: https://github.com/lumbridgecorp/openclaw-extentions-mattermost/releases/tag/v1.0.0
+[0.1.0]: https://github.com/lumbridgecorp/openclaw-extentions-mattermost/releases/tag/v0.1.0

CONTRIBUTING.md

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+# Contributing to @lumbridgecorp/openclaw-mattermost
+
+Thank you for your interest in contributing! This document provides guidelines for setting up your development environment, running tests, and submitting contributions.
+
+## Table of Contents
+
+- [Development Setup](#development-setup)
+- [Running Tests](#running-tests)
+- [Test Structure](#test-structure)
+- [Writing Tests](#writing-tests)
+- [Code Style](#code-style)
+- [Pull Request Process](#pull-request-process)
+- [Release Process](#release-process)
+
+## Development Setup
+
+### Prerequisites
+
+- **Node.js 22+** (required for native fetch and WebSocket support)
+- **pnpm** (preferred) or npm/yarn
+- **Git**
+- **Mattermost server** (for integration tests)
+
+### Local Setup
+
+1. **Fork the repository** on GitHub
+
+2. **Clone your fork:**
+   ```bash
+   git clone https://github.com/YOUR_USERNAME/openclaw-extentions-mattermost.git
+   cd openclaw-extentions-mattermost
+   ```
+
+3. **Install dependencies:**
+   ```bash
+   pnpm install
+   # or
+   npm install
+   ```
+
+4. **Build the project:**
+   ```bash
+   pnpm build
+   # or
+   npm run build
+   ```
+
+5. **Verify the build:**
+   ```bash
+   pnpm typecheck
+   ```
+
+## Running Tests
+
+### Quick Test Commands
+
+```bash
+# Run all tests
+pnpm test
+
+# Run tests in watch mode (for development)
+pnpm test -- --watch
+
+# Run tests with coverage
+pnpm test -- --coverage
+
+# Run a specific test file
+pnpm test src/mattermost/client.test.ts
+
+# Run tests matching a pattern
+pnpm test -- -t "should create client"
+
+# Run tests with verbose output
+pnpm test -- --verbose
+```
+
+### Test Categories
+
+#### Unit Tests
+
+Fast, isolated tests that don't require external services:
+
+```bash
+# Run only unit tests (no integration)
+pnpm test -- --testPathIgnorePatterns="integration|e2e"
+```
+
+Unit tests cover:
+- Error handling classes
+- Configuration validation
+- Utility functions
+- Retry logic
+- Security checks
+
+#### Integration Tests with Docker Compose
+
+Integration tests use Docker Compose to spin up a complete Mattermost instance with PostgreSQL. This provides isolated, reproducible tests against a real Mattermost API.
+
+**Setup and Run Integration Tests:**
+
+```bash
+# Start the test infrastructure
+docker-compose -f tests/integration/docker-compose.test.yml up -d
+
+# Wait for Mattermost to be ready (first startup may take 1-2 minutes)
+docker-compose -f tests/integration/docker-compose.test.yml ps
+
+# Run integration tests
+pnpm test tests/integration/
+
+# Run specific integration test file
+pnpm test tests/integration/authentication.test.ts
+
+# Run integration tests with verbose output
+pnpm test tests/integration/ --verbose
+
+# Clean up after tests
+docker-compose -f tests/integration/docker-compose.test.yml down -v
+```
+
+**Integration Test Coverage:**
+
+| Test File | Coverage |
+|-----------|----------|
+| `authentication.test.ts` | Bot token auth, PAT auth, error scenarios |
+| `send-message.test.ts` | Send to channel/DM, threads, props, error cases |
+| `edit-message.test.ts` | Edit own messages, props, permission errors |
+| `delete-message.test.ts` | Delete messages, thread handling, cleanup |
+| `download-file.test.ts` | File download, security restrictions, MIME validation |
+| `interactive-buttons.test.ts` | Button rendering, directives, end-to-end flows |
+
+**Environment Variables for Integration Tests:**
+
+```bash
+# Optional: Override defaults (only if not using Docker Compose)
+export MATTERMOST_URL="http://localhost:8065"
+export MATTERMOST_SYSADMIN_USER="sysadmin"
+export MATTERMOST_SYSADMIN_PASSWORD="Sys@dmin123"
+export MATTERMOST_TEST_USER="testuser"
+export MATTERMOST_TEST_USER_PASSWORD="Test@user123"
+export MATTERMOST_BOT_USERNAME="testbot"
+```
+
+**Test Data Cleanup:**
+
+Integration tests automatically clean up:
+- Created posts after each test suite
+- Uploaded files
+- Test channels and teams (via Docker volume reset)
+
+Run `docker-compose -f tests/integration/docker-compose.test.yml down -v` to completely reset the test environment between runs.
+
+**Using a Custom Mattermost Instance:**
+
+If you prefer to use an existing Mattermost instance for integration tests:
+
+```bash
+# Set up environment variables
+export MATTERMOST_URL="https://chat-test.example.com"
+export MATTERMOST_SYSADMIN_TOKEN="your-sysadmin-token"
+export MATTERMOST_BOT_TOKEN="your-bot-token"
+
+# Run integration tests (skip Docker setup)
+export SKIP_DOCKER_SETUP=true
+pnpm test tests/integration/
+```
+
+⚠️ **Important:** Never run integration tests against production Mattermost instances. Tests create and delete data automatically.
+
+#### Client Tests
+
+Tests for the Mattermost API client:
+
+```bash
+pnpm test src/mattermost/client.test.ts
+pnpm test src/mattermost/client.retry.test.ts
+```
+
+#### WebSocket Tests
+
+Tests for real-time message monitoring:
+
+```bash
+pnpm test src/mattermost/monitor-websocket.test.ts
+```
+
+### Test Environment Setup
+
+#### Using Environment Variables
+
+Create a `.env.test` file (not committed to git):
+
+```bash
+# Test Mattermost instance
+MATTERMOST_TEST_URL=https://chat-test.example.com
+MATTERMOST_TEST_TOKEN=your-test-bot-token
+MATTERMOST_TEST_PAT=your-test-pat-optional
+
+# Test configuration
+TEST_TIMEOUT=30000
+TEST_RETRY_COUNT=3
+```
+
+#### Using Test Fixtures
+
+Some tests use mock fixtures instead of real connections:
+
+```typescript
+// Example: Using mock client
+import { createMockMattermostClient } from './test-helpers.js';
+
+const mockClient = createMockMattermostClient({
+  baseUrl: 'https://mock.example.com',
+  botToken: 'mock-token'
+});
+```
+
+### Coverage Reports
+
+Generate and view coverage:
+
+```bash
+# Generate coverage report
+pnpm test -- --coverage
+
+# View HTML report
+open coverage/lcov-report/index.html
+
+# Coverage thresholds (enforced in CI)
+# Statements: 80%
+# Branches: 75%
+# Functions: 80%
+# Lines: 80%
+```
+
+## Test Structure
+
+### Test File Organization
+
+```
+extensions/mattermost/src/
+├── mattermost/
+│   ├── client.test.ts           # Client unit tests
+│   ├── client.retry.test.ts     # Retry logic tests
+│   ├── monitor-websocket.test.ts # WebSocket tests
+│   ├── interactions.test.ts     # Interactive components tests
+│   └── ...
+├── config-schema.test.ts        # Configuration validation
+├── security-audit.test.ts       # Security audit tests
+├── errors.test.ts               # Error handling tests
+└── ...
+```
+
+### Test Naming Conventions
+
+- **File naming**: `*.test.ts` for unit tests, `*.integration.test.ts` for integration tests
+- **Describe blocks**: Use the name of the function/module being tested
+- **Test names**: Start with "should" and describe the expected behavior
+
+Example:
+
+```typescript
+describe('editMessage', () => {
+  it('should successfully edit a bot message', async () => {
+    // test code
+  });
+  
+  it('should fail when editing another users message', async () => {
+    // test code
+  });
+  
+  it('should return PERMISSION_DENIED for system messages', async () => {
+    // test code
+  });
+});
+```
+
+## Writing Tests
+
+### Unit Test Template
+
+```typescript
+import { describe, it, expect, vi } from 'vitest';
+import { editMessage } from './actions.js';
+
+describe('editMessage', () => {
+  it('should edit a message successfully', async () => {
+    // Arrange
+    const mockClient = createMockClient();
+    const params = {
+      cfg: mockConfig,
+      postId: 'post123',
+      channelId: 'channel123',
+      message: 'Updated'
+    };
+    
+    // Act
+    const result = await editMessage(params);
+    
+    // Assert
+    expect(result.ok).toBe(true);
+    expect(result.postId).toBe('post123');
+  });
+  
+  it('should handle errors gracefully', async () => {
+    // Arrange
+    const params = { /* invalid params */ };
+    
+    // Act
+    const result = await editMessage(params);
+    
+    // Assert
+    expect(result.ok).toBe(false);
+    expect(result.errorCode).toBe('CONFIG_ERROR');
+  });
+});
+```
+
+### Testing Error Handling
+
+```typescript
+import { MattermostError, ErrorCodes } from './errors.js';
+
+describe('error handling', () => {
+  it('should create structured error with context', () => {
+    const error = new MattermostError({
+      code: ErrorCodes.AUTHENTICATION_FAILED,
+      message: 'Invalid token',
+      context: {
+        operation: 'test',
+        timestamp: new Date().toISOString()
+      }
+    });
+    
+    expect(error.code).toBe(ErrorCodes.AUTHENTICATION_FAILED);
+    expect(error.retryable).toBe(false);
+    expect(error.toJSON()).toMatchObject({
+      code: ErrorCodes.AUTHENTICATION_FAILED
+    });
+  });
+});
+```
+
+### Testing Retries
+
+```typescript
+import { withRetry } from './errors.js';
+
+describe('withRetry', () => {
+  it('should retry on retryable errors', async () => {
+    let attempts = 0;
+    const operation = async () => {
+      attempts++;
+      if (attempts < 3) {
+        throw new NetworkError('Connection failed', context);
+      }
+      return 'success';
+    };
+    
+    const result = await withRetry('test-op', operation, {
+      maxRetries: 3,
+      initialDelayMs: 10
+    });
+    
+    expect(result).toBe('success');
+    expect(attempts).toBe(3);
+  });
+});
+```
+
+### Testing Security Features
+
+```typescript
+import { collectMattermostSecurityAuditFindings } from './security-audit.js';
+
+describe('security audit', () => {
+  it('should detect hardcoded tokens', async () => {
+    const findings = await collectMattermostSecurityAuditFindings({
+      cfg: mockConfig,
+      accountId: 'test',
+      account: {
+        ...mockAccount,
+        botToken: 'hardcoded-token-123456789',
+        botTokenSource: 'config'
+      }
+    });
+    
+    const hardcodedFinding = findings.find(
+      f => f.checkId === 'channels.mattermost.pat.hardcoded_token'
+    );
+    
+    expect(hardcodedFinding).toBeDefined();
+    expect(hardcodedFinding?.severity).toBe('critical');
+  });
+});
+```
+
+### Mocking the Mattermost Client
+
+```typescript
+import { vi } from 'vitest';
+
+// Create mock client
+const createMockClient = () => ({
+  request: vi.fn(),
+  fetchImpl: vi.fn(),
+  baseUrl: 'https://mock.example.com',
+  apiBaseUrl: 'https://mock.example.com/api/v4',
+  token: 'mock-token'
+});
+
+// Mock module
+vi.mock('./client.js', () => ({
+  createMattermostClient: vi.fn(() => createMockClient())
+}));
+```
+
+## Code Style
+
+### TypeScript Guidelines
+
+- Use strict TypeScript (`strict: true` in tsconfig)
+- Explicit return types on public functions
+- Avoid `any` - use `unknown` with type guards
+- Use `readonly` for immutable properties
+
+### Code Formatting
+
+```bash
+# Check code style
+pnpm lint
+
+# Fix auto-fixable issues
+pnpm lint --fix
+```
+
+### Import Order
+
+1. External dependencies (e.g., `openclaw/plugin-sdk`)
+2. Internal modules (relative imports)
+3. Types only imports
+
+Example:
+
+```typescript
+// 1. External
+import { z } from 'openclaw/plugin-sdk/zod';
+
+// 2. Internal
+import { createMattermostClient } from './client.js';
+import type { MattermostAccountConfig } from './types.js';
+```
+
+## Pull Request Process
+
+### Before Submitting
+
+1. **Run all tests:**
+   ```bash
+   pnpm test
+   ```
+
+2. **Check type safety:**
+   ```bash
+   pnpm typecheck
+   ```
+
+3. **Run linter:**
+   ```bash
+   pnpm lint
+   ```
+
+4. **Build project:**
+   ```bash
+   pnpm build
+   ```
+
+5. **Check test coverage:**
+   ```bash
+   pnpm test -- --coverage
+   ```
+
+### PR Requirements
+
+- **Clear description** of changes
+- **Link to related issues**
+- **Tests included** for new features
+- **Documentation updated** if needed
+- **No breaking changes** (or clearly marked)
+- **CI checks passing**
+
+### PR Template
+
+```markdown
+## Description
+Brief description of the change
+
+## Type of Change
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Breaking change
+- [ ] Documentation update
+
+## Testing
+- [ ] Unit tests added/updated
+- [ ] Integration tests added/updated
+- [ ] All tests passing
+
+## Checklist
+- [ ] Code follows style guidelines
+- [ ] Self-review completed
+- [ ] Documentation updated
+- [ ] No new warnings
+```
+
+### Review Process
+
+1. Automated checks must pass (CI, coverage)
+2. At least one maintainer review required
+3. Address review feedback promptly
+4. Squash commits before merge (if requested)
+
+## Release Process
+
+### Version Bump
+
+```bash
+# Update version in package.json
+npm version patch  # or minor, major
+```
+
+### Changelog Update
+
+Add entry to `CHANGELOG.md` following Keep a Changelog format:
+
+```markdown
+## [1.1.0] - 2026-04-15
+
+### Added
+- New feature description
+
+### Fixed
+- Bug fix description
+```
+
+### Release Steps
+
+1. Update version in `package.json`
+2. Update `CHANGELOG.md`
+3. Create PR with version bump
+4. After merge, tag the release:
+   ```bash
+   git tag -a v1.1.0 -m "Release v1.1.0"
+   git push origin v1.1.0
+   ```
+5. CI will automatically publish to npm
+
+## Questions?
+
+- Open an issue on GitHub
+- Check existing issues and discussions
+- Review the [API Reference](docs/API.md)
+
+Thank you for contributing!

LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
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README.md

@@ -0,0 +1,507 @@
+# @lumbridgecorp/openclaw-mattermost
+
+<p align="center">
+  <a href="https://www.npmjs.com/package/@lumbridgecorp/openclaw-mattermost"><img src="https://img.shields.io/npm/v/@lumbridgecorp/openclaw-mattermost.svg?style=for-the-badge&color=blue" alt="npm version"></a>
+  <a href="https://git.karti.ai/open-source/openclaw-extentions-mattermost/releases/tag/v1.0.0"><img src="https://img.shields.io/badge/Release-v1.0.0-green.svg?style=for-the-badge" alt="Latest Release"></a>
+  <a href="https://git.karti.ai/open-source/openclaw-extentions-mattermost/actions"><img src="https://img.shields.io/badge/CI-Passing-brightgreen.svg?style=for-the-badge" alt="CI Status"></a>
+  <a href="LICENSE"><img src="https://img.shields.io/badge/License-Apache%202.0-blue.svg?style=for-the-badge" alt="Apache 2.0 License"></a>
+  <a href="https://git.karti.ai/open-source/openclaw-extentions-mattermost/issues"><img src="https://img.shields.io/badge/Issues-Open-orange.svg?style=for-the-badge" alt="Open Issues"></a>
+</p>
+
+<p align="center">
+  <strong>Enhanced Mattermost Extension for OpenClaw</strong><br>
+  A powerful, secure, and feature-rich self-hosted Slack-style chat integration
+</p>
+
+## Overview
+
+This enhanced Mattermost extension brings advanced capabilities to OpenClaw, enabling seamless integration with your self-hosted Mattermost server. It supports both bot tokens and Personal Access Tokens (PAT), interactive message components, file operations, and comprehensive security auditing.
+
+## Features
+
+### Authentication
+- **Dual Token Support**: Use bot tokens, Personal Access Tokens (PAT), or both
+- **PAT for Enhanced Security**: Separate read and write permissions with token selection strategy
+- **Environment Variable Support**: Secure token management without hardcoding
+
+### Message Operations
+- **Send Messages**: Post to channels and DMs with rich formatting
+- **Edit Messages**: Update bot messages with full permission controls
+- **Delete Messages**: Remove messages with safety checks
+- **Reactions**: Add emoji reactions to messages
+
+### Interactive Components
+- **Button Directives**: `[[mattermost_buttons: Label:value:style, ...]]`
+- **Select/Dropdown Directives**: `[[mattermost_select: Placeholder | Label:value, ...]]`
+- **Style Support**: default, primary, danger button styles
+
+### File Operations
+- **Download Files**: Secure file downloads with:
+  - MIME type validation
+  - Executable file blocking
+  - Size limits (default 100MB)
+  - Streaming download for large files
+
+### Security
+- **Security Audit**: Automated security configuration scanning
+- **SSRF Protection**: Guarded outbound requests
+- **HTTPS Enforcement**: Warnings for insecure connections
+- **IP Allowlisting**: Restrict interaction callbacks
+- **Private Network Support**: For LAN/VPN deployments
+
+### Error Handling
+- **Structured Errors**: Typed error classes with context
+- **Automatic Retry**: Exponential backoff with jitter
+- **Rate Limit Handling**: Respects Mattermost rate limits
+- **User-Friendly Messages**: Clear error descriptions
+
+## Installation
+
+### Prerequisites
+
+- Node.js 22 or higher
+- Mattermost server (self-hosted or cloud)
+- OpenClaw 1.0.0 or higher
+
+### NPM Installation
+
+```bash
+npm install @lumbridgecorp/openclaw-mattermost
+```
+
+### PNPM Installation
+
+```bash
+pnpm add @lumbridgecorp/openclaw-mattermost
+```
+
+### Yarn Installation
+
+```bash
+yarn add @lumbridgecorp/openclaw-mattermost
+```
+
+## Quick Start
+
+### 1. Create a Bot Account in Mattermost
+
+1. Go to **System Console > Integrations > Bot Accounts**
+2. Click **Add Bot Account**
+3. Set username (e.g., `openclaw-bot`)
+4. Choose role (usually **System Admin** for full access, or **Member** for restricted)
+5. Save the generated **Bot Token**
+
+### 2. Configure Environment Variables
+
+```bash
+export MATTERMOST_URL="https://chat.yourcompany.com"
+export MATTERMOST_BOT_TOKEN="your-bot-token-here"
+```
+
+### 3. Basic Configuration
+
+```json
+{
+  "channels": {
+    "mattermost": {
+      "baseUrl": "https://chat.yourcompany.com",
+      "botToken": "${MATTERMOST_BOT_TOKEN}",
+      "dmPolicy": "pairing",
+      "allowFrom": ["your-mattermost-user-id"]
+    }
+  }
+}
+```
+
+### 4. Using PAT (Optional but Recommended)
+
+For enhanced security with separate read/write permissions:
+
+```bash
+export MATTERMOST_PAT="your-personal-access-token"
+```
+
+```json
+{
+  "channels": {
+    "mattermost": {
+      "baseUrl": "https://chat.yourcompany.com",
+      "botToken": "${MATTERMOST_BOT_TOKEN}",
+      "pat": "${MATTERMOST_PAT}",
+      "dmPolicy": "pairing"
+    }
+  }
+}
+```
+
+## Configuration Reference
+
+### Core Settings
+
+| Option | Type | Required | Default | Description |
+|--------|------|----------|---------|-------------|
+| `baseUrl` | string | Yes | - | Mattermost server URL (HTTPS recommended) |
+| `botToken` | string | Yes | - | Bot account token |
+| `pat` | string | No | - | Personal Access Token for write operations |
+| `enabled` | boolean | No | true | Enable/disable this account |
+| `name` | string | No | - | Display name for the account |
+
+### Access Control
+
+| Option | Type | Required | Default | Description |
+|--------|------|----------|---------|-------------|
+| `dmPolicy` | enum | No | `pairing` | DM access: `open`, `allowlist`, or `pairing` |
+| `allowFrom` | array | No | [] | User IDs allowed to DM the bot |
+| `groupPolicy` | enum | No | `allowlist` | Group channel access: `open` or `allowlist` |
+| `groupAllowFrom` | array | No | [] | User IDs allowed in group channels |
+| `requireMention` | boolean | No | false | Require @mention to trigger bot |
+
+### Chat Modes
+
+| Option | Type | Required | Default | Description |
+|--------|------|----------|---------|-------------|
+| `chatmode` | enum | No | `onmessage` | Trigger mode: `oncall`, `onmessage`, `onchar` |
+| `oncharPrefixes` | array | No | [] | Prefixes for onchar mode (e.g., `["!", "/"`) |
+
+### Message Settings
+
+| Option | Type | Required | Default | Description |
+|--------|------|----------|---------|-------------|
+| `textChunkLimit` | number | No | - | Max characters per message chunk |
+| `chunkMode` | enum | No | `length` | Chunking: `length` or `newline` |
+| `blockStreaming` | boolean | No | false | Enable streaming responses |
+| `replyToMode` | enum | No | `off` | Reply threading: `off`, `first`, `all` |
+| `responsePrefix` | string | No | - | Text prepended to all responses |
+
+### Slash Commands
+
+| Option | Type | Required | Default | Description |
+|--------|------|----------|---------|-------------|
+| `commands.native` | boolean\|"auto" | No | `auto` | Enable native slash commands |
+| `commands.nativeSkills` | boolean\|"auto" | No | `auto` | Enable skill-based commands |
+| `commands.callbackPath` | string | No | - | Custom callback endpoint path |
+| `commands.callbackUrl` | string | No | - | Explicit callback URL |
+
+### Interactions
+
+| Option | Type | Required | Default | Description |
+|--------|------|----------|---------|-------------|
+| `interactions.callbackBaseUrl` | string | No | - | HTTPS URL for button callbacks |
+| `interactions.allowedSourceIps` | array | No | [] | IP allowlist for callbacks |
+
+### Security Settings
+
+| Option | Type | Required | Default | Description |
+|--------|------|----------|---------|-------------|
+| `allowPrivateNetwork` | boolean | No | false | Allow private IP connections |
+| `configWrites` | boolean | No | false | Allow bot to write config |
+| `dangerouslyAllowNameMatching` | boolean | No | false | Match users by name (not ID) |
+
+### Retry Configuration
+
+| Option | Type | Required | Default | Description |
+|--------|------|----------|---------|-------------|
+| `dmChannelRetry.maxRetries` | number | No | 3 | Max DM creation retries |
+| `dmChannelRetry.initialDelayMs` | number | No | 1000 | Initial retry delay |
+| `dmChannelRetry.maxDelayMs` | number | No | 10000 | Maximum retry delay |
+| `dmChannelRetry.timeoutMs` | number | No | 30000 | Request timeout |
+
+### Action Controls
+
+| Option | Type | Required | Default | Description |
+|--------|------|----------|---------|-------------|
+| `actions.reactions` | boolean | No | true | Enable emoji reactions |
+| `actions.downloadFile` | boolean | No | true | Enable file downloads |
+| `actions.delete` | boolean | No | true | Enable message deletion |
+
+### Group-Specific Settings
+
+```json
+{
+  "channels": {
+    "mattermost": {
+      "groups": {
+        "channel-id-1": {
+          "requireMention": true
+        },
+        "*": {
+          "requireMention": false
+        }
+      }
+    }
+  }
+}
+```
+
+## Personal Access Token (PAT) Setup Guide
+
+### Why Use PAT?
+
+Personal Access Tokens provide several advantages:
+- **Separate Permissions**: Use bot token for reads, PAT for writes
+- **User Context**: Actions appear as the user, not a bot
+- **Audit Trail**: Better tracking in Mattermost logs
+- **Granular Control**: Revoke without affecting bot
+
+### Creating a PAT in Mattermost
+
+1. **Log in to Mattermost** as the user who will own the PAT
+2. Go to **Account Settings > Security > Personal Access Tokens**
+3. Click **Create New Token**
+4. Enter a description (e.g., "OpenClaw Integration")
+5. Click **Save**
+6. **Copy the token immediately** (it won't be shown again)
+
+### Required Permissions
+
+The user creating the PAT needs these permissions:
+- **Create Posts** - to send messages
+- **Edit Own Posts** - to edit bot messages
+- **Delete Own Posts** - to delete bot messages
+- **Upload Files** - to upload attachments
+- **Create Direct Channels** - for DM support
+
+### Token Selection Strategy
+
+The extension automatically selects the right token:
+
+| Operation Type | Token Used |
+|----------------|------------|
+| Read (fetch user, channel info) | Bot Token |
+| Write (send message) | PAT (if set) or Bot Token |
+| Edit | PAT (if set) or Bot Token |
+| Delete | PAT (if set) or Bot Token |
+| File Download | Bot Token |
+
+## Feature Comparison: Enhanced vs Stock Extension
+
+| Feature | Stock Extension | Enhanced Extension |
+|---------|--------------|-------------------|
+| Bot Token Only | ✅ | ✅ |
+| Personal Access Token (PAT) | ❌ | ✅ |
+| Message Editing | ❌ | ✅ |
+| Message Deletion | ❌ | ✅ |
+| File Download | ❌ | ✅ |
+| Interactive Buttons | ❌ | ✅ |
+| Interactive Selects | ❌ | ✅ |
+| Security Audit | ❌ | ✅ |
+| Structured Error Handling | Basic | ✅ Advanced |
+| Automatic Retry Logic | ❌ | ✅ |
+| Rate Limit Handling | Basic | ✅ Full |
+| SSRF Protection | ❌ | ✅ |
+| Multi-Account Support | ❌ | ✅ |
+| Slash Commands | Basic | ✅ Advanced |
+
+## Usage Examples
+
+### Sending Messages
+
+```typescript
+import { sendMessage } from '@lumbridgecorp/openclaw-mattermost';
+
+await sendMessage({
+  cfg: openclawConfig,
+  channelId: 'channel-id-here',
+  message: 'Hello from OpenClaw!'
+});
+```
+
+### Interactive Buttons
+
+```typescript
+const message = `
+Please select an action:
+[[mattermost_buttons: Approve:approve:primary, Reject:reject:danger, Review Later:review]]
+`;
+
+await sendMessage({
+  cfg: openclawConfig,
+  channelId: 'channel-id',
+  message
+});
+```
+
+### Interactive Select/Dropdown
+
+```typescript
+const message = `
+Choose a priority:
+[[mattermost_select: Select Priority | Low:low, Medium:medium, High:high, Critical:critical]]
+`;
+
+await sendMessage({
+  cfg: openclawConfig,
+  channelId: 'channel-id',
+  message
+});
+```
+
+### Editing Messages
+
+```typescript
+import { editMessage } from '@lumbridgecorp/openclaw-mattermost';
+
+const result = await editMessage({
+  cfg: openclawConfig,
+  postId: 'post-id-to-edit',
+  channelId: 'channel-id',
+  message: 'Updated message content'
+});
+
+if (!result.ok) {
+  console.error('Edit failed:', result.error);
+}
+```
+
+### Deleting Messages
+
+```typescript
+import { deleteMessage } from '@lumbridgecorp/openclaw-mattermost';
+
+const result = await deleteMessage({
+  cfg: openclawConfig,
+  postId: 'post-id-to-delete',
+  channelId: 'channel-id'
+});
+
+if (result.ok) {
+  console.log('Message deleted');
+}
+```
+
+### Downloading Files
+
+```typescript
+import { downloadFile } from '@lumbridgecorp/openclaw-mattermost';
+
+const result = await downloadFile({
+  cfg: openclawConfig,
+  fileId: 'file-id-from-mattermost',
+  destinationPath: '/tmp/downloads/report.pdf',
+  maxSize: 50 * 1024 * 1024 // 50MB limit
+});
+
+if (result.ok) {
+  console.log('Downloaded to:', result.filePath);
+  console.log('File metadata:', result.metadata);
+}
+```
+
+### Running Security Audit
+
+```typescript
+import { collectMattermostSecurityAuditFindings } from '@lumbridgecorp/openclaw-mattermost';
+
+const findings = await collectMattermostSecurityAuditFindings({
+  cfg: openclawConfig,
+  accountId: 'default',
+  account: resolvedAccount
+});
+
+for (const finding of findings) {
+  console.log(`[${finding.severity}] ${finding.title}`);
+  console.log(`  ${finding.detail}`);
+  if (finding.remediation) {
+    console.log(`  Fix: ${finding.remediation}`);
+  }
+}
+```
+
+## Troubleshooting
+
+### Connection Issues
+
+**Problem**: Cannot connect to Mattermost server
+
+**Solutions**:
+1. Verify `baseUrl` uses HTTPS (not HTTP)
+2. Check the server is accessible: `curl https://your-server/api/v4/system/ping`
+3. For self-hosted servers, set `allowPrivateNetwork: true`
+4. Check firewall rules
+
+### Authentication Errors
+
+**Problem**: 401 Unauthorized errors
+
+**Solutions**:
+1. Verify the bot token is correct
+2. Check the bot account is enabled in Mattermost
+3. Ensure the bot has required permissions
+4. For PAT, verify the user account is active
+
+### Rate Limiting
+
+**Problem**: 429 Too Many Requests
+
+**Solutions**:
+1. The extension has built-in retry logic
+2. Increase `dmChannelRetry.maxDelayMs` for longer waits
+3. Contact your Mattermost admin to increase rate limits
+4. Reduce message frequency
+
+### File Download Failures
+
+**Problem**: Cannot download files
+
+**Solutions**:
+1. Check file size against `maxSize` limit (default 100MB)
+2. Verify file type is allowed (not executable)
+3. Ensure bot has file access permissions
+4. Check disk space at destination
+
+### Interactive Components Not Working
+
+**Problem**: Buttons/selects don't appear
+
+**Solutions**:
+1. Verify `interactions.callbackBaseUrl` is set with HTTPS
+2. Check `allowedSourceIps` includes your Mattermost server
+3. Ensure the directive syntax is correct
+4. Check browser console for JavaScript errors
+
+### Message Edit/Delete Failures
+
+**Problem**: Cannot edit or delete messages
+
+**Solutions**:
+1. Can only edit/delete bot's own messages
+2. System messages cannot be modified
+3. Check PAT permissions if using PAT
+4. Verify the post ID and channel ID are correct
+
+### Security Audit Warnings
+
+**Problem**: Security audit shows warnings
+
+**Solutions**:
+1. Move hardcoded tokens to environment variables
+2. Switch to HTTPS if using HTTP
+3. Configure `allowFrom` for restricted access
+4. Review `dmPolicy` and `groupPolicy` settings
+
+## Development
+
+See [CONTRIBUTING.md](CONTRIBUTING.md) for development setup and contribution guidelines.
+
+## API Reference
+
+See [docs/API.md](docs/API.md) for detailed API documentation.
+
+## Migration Guide
+
+If you're migrating from the stock Mattermost extension, see [docs/MIGRATION.md](docs/MIGRATION.md).
+
+## License
+
+This project is licensed under the Apache License 2.0. See [LICENSE](LICENSE) for details.
+
+## Support
+
+- **Issues**: [GitHub Issues](https://github.com/lumbridgecorp/openclaw-extentions-mattermost/issues)
+- **Discussions**: [GitHub Discussions](https://github.com/lumbridgecorp/openclaw-extentions-mattermost/discussions)
+
+---
+
+<p align="center">
+  Built with ❤️ by <a href="https://github.com/lumbridgecorp">Lumbridge Corp</a>
+</p>

docs/API.md

@@ -0,0 +1,864 @@
+# API Reference
+
+Complete reference for the Enhanced Mattermost Extension API.
+
+## Table of Contents
+
+- [Actions](#actions)
+- [Interactive Directives](#interactive-directives)
+- [Configuration Types](#configuration-types)
+- [Error Handling](#error-handling)
+- [Security Audit](#security-audit)
+- [Client API](#client-api)
+
+## Actions
+
+### editMessage
+
+Edit an existing message posted by the bot.
+
+```typescript
+import { editMessage } from '@lumbridgecorp/openclaw-mattermost';
+
+const result = await editMessage({
+  cfg: OpenClawConfig,
+  postId: string,
+  channelId: string,
+  message?: string,
+  props?: Record<string, unknown>,
+  accountId?: string | null,
+  fetchImpl?: MattermostFetch
+});
+```
+
+**Parameters:**
+
+| Parameter | Type | Required | Description |
+|-----------|------|----------|-------------|
+| `cfg` | `OpenClawConfig` | Yes | OpenClaw configuration object |
+| `postId` | `string` | Yes | ID of the post to edit |
+| `channelId` | `string` | Yes | Channel ID containing the post |
+| `message` | `string` | No | New message content |
+| `props` | `Record<string, unknown>` | No | Additional post properties |
+| `accountId` | `string \| null` | No | Specific account to use |
+| `fetchImpl` | `MattermostFetch` | No | Custom fetch implementation |
+
+**Returns:**
+
+```typescript
+type EditMessageResult =
+  | { ok: true; postId: string; channelId: string }
+  | { ok: false; error: string; errorCode?: string };
+```
+
+**Error Codes:**
+- `PERMISSION_DENIED` - Cannot edit other users' messages or system messages
+- `POST_NOT_FOUND` - Post was deleted or doesn't exist
+- `RATE_LIMITED` - Too many edit requests
+- `AUTH_FAILED` - Invalid or expired token
+
+**Example:**
+
+```typescript
+const result = await editMessage({
+  cfg: openclawConfig,
+  postId: 'abc123def456ghi789jkl012',
+  channelId: 'channel123',
+  message: 'Updated message content'
+});
+
+if (result.ok) {
+  console.log(`Edited post ${result.postId}`);
+} else {
+  console.error(`Edit failed: ${result.error} (${result.errorCode})`);
+}
+```
+
+---
+
+### deleteMessage
+
+Delete a message posted by the bot.
+
+```typescript
+import { deleteMessage } from '@lumbridgecorp/openclaw-mattermost';
+
+const result = await deleteMessage({
+  cfg: OpenClawConfig,
+  postId: string,
+  channelId?: string,
+  accountId?: string | null,
+  fetchImpl?: MattermostFetch
+});
+```
+
+**Parameters:**
+
+| Parameter | Type | Required | Description |
+|-----------|------|----------|-------------|
+| `cfg` | `OpenClawConfig` | Yes | OpenClaw configuration object |
+| `postId` | `string` | Yes | ID of the post to delete |
+| `channelId` | `string` | No | Channel ID (for validation) |
+| `accountId` | `string \| null` | No | Specific account to use |
+| `fetchImpl` | `MattermostFetch` | No | Custom fetch implementation |
+
+**Returns:**
+
+```typescript
+type DeleteMessageResult = { ok: true } | { ok: false; error: string };
+```
+
+**Notes:**
+- Returns `ok: true` if post is already deleted (idempotent)
+- Cannot delete system messages
+- Can only delete bot's own messages
+
+**Example:**
+
+```typescript
+const result = await deleteMessage({
+  cfg: openclawConfig,
+  postId: 'abc123def456ghi789jkl012'
+});
+
+if (result.ok) {
+  console.log('Message deleted successfully');
+} else {
+  console.error(`Delete failed: ${result.error}`);
+}
+```
+
+---
+
+### downloadFile
+
+Download a file from Mattermost with security validations.
+
+```typescript
+import { downloadFile } from '@lumbridgecorp/openclaw-mattermost';
+
+const result = await downloadFile({
+  cfg: OpenClawConfig,
+  fileId: string,
+  destinationPath: string,
+  maxSize?: number,
+  accountId?: string | null,
+  fetchImpl?: MattermostFetch,
+  allowedMimePrefixes?: string[]
+});
+```
+
+**Parameters:**
+
+| Parameter | Type | Required | Default | Description |
+|-----------|------|----------|---------|-------------|
+| `cfg` | `OpenClawConfig` | Yes | - | OpenClaw configuration |
+| `fileId` | `string` | Yes | - | Mattermost file ID |
+| `destinationPath` | `string` | Yes | - | Local path to save file |
+| `maxSize` | `number` | No | 100MB | Maximum file size in bytes |
+| `accountId` | `string \| null` | No | - | Specific account to use |
+| `fetchImpl` | `MattermostFetch` | No | - | Custom fetch implementation |
+| `allowedMimePrefixes` | `string[]` | No | Built-in list | Allowed MIME types |
+
+**Returns:**
+
+```typescript
+type DownloadFileResult =
+  | { ok: true; filePath: string; fileId: string; metadata: FileMetadata }
+  | { ok: false; error: string; errorCode?: string };
+
+type FileMetadata = {
+  id: string;
+  name: string;
+  mimeType: string;
+  size: number;
+  extension: string;
+};
+```
+
+**Error Codes:**
+- `CONFIG_ERROR` - Missing botToken or baseUrl
+- `INVALID_PARAMS` - Missing fileId or destinationPath
+- `FILE_TOO_LARGE` - File exceeds maxSize
+- `EMPTY_FILE` - File has no content
+- `BLOCKED_FILE_TYPE` - Executable file extension
+- `BLOCKED_MIME_TYPE` - MIME type not in allowlist
+- `FILE_NOT_FOUND` - File doesn't exist
+- `PERMISSION_DENIED` - No access to file
+- `AUTH_FAILED` - Invalid token
+- `DOWNLOAD_FAILED` - Network or server error
+
+**Security Restrictions:**
+
+Blocked file extensions:
+```
+.exe, .sh, .bat, .cmd, .com, .msi, .dll, .so, .dylib,
+.app, .dmg, .pkg, .deb, .rpm, .apk, .ipa, .jar, .war,
+.ear, .py, .rb, .pl, .php, .js, .ts, .vbs, .ps1, .psm1,
+.scr, .hta, .bin, .run, .out, .elf
+```
+
+Default allowed MIME types:
+```
+image/*, video/*, audio/*, text/*
+application/pdf, application/json, application/xml
+application/csv, application/zip, application/gzip, application/tar
+```
+
+**Example:**
+
+```typescript
+const result = await downloadFile({
+  cfg: openclawConfig,
+  fileId: 'file123abc',
+  destinationPath: '/tmp/report.pdf',
+  maxSize: 50 * 1024 * 1024 // 50MB
+});
+
+if (result.ok) {
+  console.log(`Downloaded: ${result.filePath}`);
+  console.log(`Size: ${result.metadata.size} bytes`);
+  console.log(`Type: ${result.metadata.mimeType}`);
+}
+```
+
+---
+
+### sendMessage
+
+Send a message to a Mattermost channel.
+
+```typescript
+import { sendMessage } from '@lumbridgecorp/openclaw-mattermost';
+
+await sendMessage({
+  cfg: OpenClawConfig,
+  channelId: string,
+  message: string,
+  rootId?: string,
+  fileIds?: string[],
+  props?: Record<string, unknown>,
+  accountId?: string | null
+});
+```
+
+**Parameters:**
+
+| Parameter | Type | Required | Description |
+|-----------|------|----------|-------------|
+| `cfg` | `OpenClawConfig` | Yes | OpenClaw configuration |
+| `channelId` | `string` | Yes | Target channel ID |
+| `message` | `string` | Yes | Message content (supports Markdown) |
+| `rootId` | `string` | No | Parent post ID for threaded replies |
+| `fileIds` | `string[]` | No | Array of uploaded file IDs to attach |
+| `props` | `Record<string, unknown>` | No | Additional post properties |
+| `accountId` | `string \| null` | No | Specific account to use |
+
+**Example:**
+
+```typescript
+await sendMessage({
+  cfg: openclawConfig,
+  channelId: 'channel123',
+  message: 'Hello **World**!',  // Markdown supported
+  rootId: 'parent-post-id'  // Thread reply
+});
+```
+
+---
+
+### addReaction
+
+Add an emoji reaction to a message.
+
+```typescript
+import { addReaction } from '@lumbridgecorp/openclaw-mattermost';
+
+await addReaction({
+  cfg: OpenClawConfig,
+  postId: string,
+  emoji: string,  // e.g., 'thumbsup', 'white_check_mark'
+  accountId?: string | null
+});
+```
+
+**Example:**
+
+```typescript
+await addReaction({
+  cfg: openclawConfig,
+  postId: 'post123',
+  emoji: 'thumbsup'
+});
+```
+
+---
+
+### uploadFile
+
+Upload a file to Mattermost.
+
+```typescript
+import { uploadFile } from '@lumbridgecorp/openclaw-mattermost';
+
+const fileInfo = await uploadFile({
+  cfg: OpenClawConfig,
+  channelId: string,
+  buffer: Buffer,
+  fileName: string,
+  contentType?: string,
+  accountId?: string | null
+});
+```
+
+**Returns:** `MattermostFileInfo` object with `id`, `name`, `mime_type`, `size`
+
+**Example:**
+
+```typescript
+import { readFileSync } from 'fs';
+
+const buffer = readFileSync('./document.pdf');
+const fileInfo = await uploadFile({
+  cfg: openclawConfig,
+  channelId: 'channel123',
+  buffer,
+  fileName: 'document.pdf',
+  contentType: 'application/pdf'
+});
+
+// Use the file ID when sending a message
+await sendMessage({
+  cfg: openclawConfig,
+  channelId: 'channel123',
+  message: 'Here is the document:',
+  fileIds: [fileInfo.id]
+});
+```
+
+---
+
+## Interactive Directives
+
+Interactive directives allow you to embed buttons and dropdowns in messages using a special syntax. These are parsed and converted to Mattermost interactive components.
+
+### Button Directive
+
+Syntax:
+```
+[[mattermost_buttons: Label1:value1:style1, Label2:value2:style2, ...]]
+```
+
+**Format:**
+- `Label`: Display text on the button (max 30 chars)
+- `value`: Value sent when button is clicked
+- `style`: Button style - `default`, `primary`, or `danger` (optional, defaults to `default`)
+
+**Maximum:** 5 buttons per directive
+
+**Example:**
+
+```typescript
+const message = `
+Please review this request:
+
+[[mattermost_buttons: 
+  Approve:approve_request:primary, 
+  Reject:reject_request:danger, 
+  Review Later:review_later:default
+]]
+`;
+
+await sendMessage({ cfg: openclawConfig, channelId: 'channel123', message });
+```
+
+---
+
+### Select/Dropdown Directive
+
+Syntax:
+```
+[[mattermost_select: Placeholder | Label1:value1, Label2:value2, ...]]
+```
+
+**Format:**
+- `Placeholder`: Text shown when nothing selected (optional, defaults to "Choose an option")
+- `Label`: Display text for the option
+- `value`: Value sent when option is selected
+
+**Maximum:** 100 options per directive
+
+**Example:**
+
+```typescript
+const message = `
+Select a priority level:
+
+[[mattermost_select: 
+  Select Priority | 
+  Low:low, 
+  Medium:medium, 
+  High:high, 
+  Critical:critical
+]]
+`;
+
+await sendMessage({ cfg: openclawConfig, channelId: 'channel123', message });
+```
+
+---
+
+### Multiple Directives
+
+You can combine multiple directives in a single message:
+
+```typescript
+const message = `
+Deployment ready for production.
+
+[[mattermost_buttons: Deploy:deploy:primary, Cancel:cancel:danger]]
+
+Select deployment region:
+[[mattermost_select: Choose Region | US East:us-east, US West:us-west, EU:eu, APAC:apac]]
+`;
+```
+
+---
+
+### Handling Interactions
+
+When a user interacts with buttons or selects, Mattermost sends a callback to your configured `interactions.callbackBaseUrl`:
+
+```json
+{
+  "type": "button" | "select",
+  "value": "the_button_or_option_value",
+  "user_id": "mattermost_user_id",
+  "channel_id": "channel_id",
+  "post_id": "original_post_id",
+  "context": { ... }
+}
+```
+
+**Configuration:**
+
+```json
+{
+  "channels": {
+    "mattermost": {
+      "interactions": {
+        "callbackBaseUrl": "https://your-bot.example.com/callbacks",
+        "allowedSourceIps": ["10.0.0.0/8", "192.168.1.0/24"]
+      }
+    }
+  }
+}
+```
+
+---
+
+## Configuration Types
+
+### MattermostAccountConfig
+
+```typescript
+interface MattermostAccountConfig {
+  // Core settings
+  baseUrl?: string;
+  botToken?: SecretInput;
+  pat?: SecretInput;
+  enabled?: boolean;
+  name?: string;
+  
+  // Access control
+  dmPolicy?: 'open' | 'allowlist' | 'pairing';
+  allowFrom?: Array<string | number>;
+  groupPolicy?: 'open' | 'allowlist';
+  groupAllowFrom?: Array<string | number>;
+  requireMention?: boolean;
+  
+  // Chat modes
+  chatmode?: 'oncall' | 'onmessage' | 'onchar';
+  oncharPrefixes?: string[];
+  
+  // Message settings
+  textChunkLimit?: number;
+  chunkMode?: 'length' | 'newline';
+  blockStreaming?: boolean;
+  blockStreamingCoalesce?: BlockStreamingConfig;
+  replyToMode?: 'off' | 'first' | 'all';
+  responsePrefix?: string;
+  
+  // Slash commands
+  commands?: {
+    native?: boolean | 'auto';
+    nativeSkills?: boolean | 'auto';
+    callbackPath?: string;
+    callbackUrl?: string;
+  };
+  
+  // Interactions
+  interactions?: {
+    callbackBaseUrl?: string;
+    allowedSourceIps?: string[];
+  };
+  
+  // Actions
+  actions?: {
+    reactions?: boolean;
+    downloadFile?: boolean;
+    delete?: boolean;
+  };
+  
+  // Security
+  allowPrivateNetwork?: boolean;
+  configWrites?: boolean;
+  dangerouslyAllowNameMatching?: boolean;
+  
+  // Retry
+  dmChannelRetry?: {
+    maxRetries?: number;
+    initialDelayMs?: number;
+    maxDelayMs?: number;
+    timeoutMs?: number;
+  };
+  
+  // Group-specific settings
+  groups?: Record<string, {
+    requireMention?: boolean;
+  }>;
+  
+  // Capabilities
+  capabilities?: string[] | { interactiveReplies?: boolean };
+  markdown?: MarkdownConfig;
+}
+```
+
+### SecretInput
+
+Secret values can be provided in multiple formats:
+
+```typescript
+type SecretInput = 
+  | string                    // Raw value (not recommended for production)
+  | { $env: string }          // Environment variable reference
+  | { $file: string }         // File path containing secret
+  | { $secretRef: string };   // Secret manager reference
+```
+
+**Examples:**
+
+```json
+{
+  "botToken": "${MATTERMOST_BOT_TOKEN}",
+  "botToken": { "$env": "MATTERMOST_BOT_TOKEN" },
+  "botToken": { "$file": "/run/secrets/bot_token" }
+}
+```
+
+---
+
+## Error Handling
+
+### Error Classes
+
+All errors extend `MattermostError` with structured information:
+
+```typescript
+class MattermostError extends Error {
+  readonly code: ErrorCode;
+  readonly context: ErrorContext;
+  readonly retryable: boolean;
+  readonly userMessage: string;
+  readonly retryAfterMs?: number;
+  
+  toJSON(): Record<string, unknown>;
+  toLogString(): string;
+}
+```
+
+### Error Codes
+
+| Code | Description | Retryable |
+|------|-------------|-----------|
+| `MATTERMOST_API_ERROR` | General API error | Depends on status |
+| `MATTERMOST_API_TIMEOUT` | Request timeout | Yes |
+| `MATTERMOST_API_RATE_LIMIT` | Rate limited | Yes |
+| `AUTHENTICATION_FAILED` | Invalid credentials | No |
+| `TOKEN_INVALID` | Token revoked | No |
+| `TOKEN_EXPIRED` | Token expired | No |
+| `PERMISSION_DENIED` | Access denied | No |
+| `POST_EDIT_DENIED` | Cannot edit post | No |
+| `CHANNEL_ACCESS_DENIED` | Channel access denied | No |
+| `RESOURCE_NOT_FOUND` | Resource not found | No |
+| `VALIDATION_ERROR` | Invalid input | No |
+| `CONFIGURATION_ERROR` | Bad configuration | No |
+| `MISSING_BOT_TOKEN` | No bot token | No |
+| `MISSING_BASE_URL` | No base URL | No |
+| `NETWORK_ERROR` | Network failure | Yes |
+| `CONNECTION_ERROR` | Cannot connect | Yes |
+| `TIMEOUT_ERROR` | Operation timed out | Yes |
+| `FILE_TOO_LARGE` | File exceeds limit | No |
+| `BLOCKED_FILE_TYPE` | Executable file | No |
+| `DOWNLOAD_FAILED` | Download error | Yes |
+
+### Using Error Boundaries
+
+```typescript
+import { globalErrorBoundary, MattermostError } from '@lumbridgecorp/openclaw-mattermost';
+
+// Register error handler
+const unsubscribe = globalErrorBoundary.onError((error) => {
+  if (error instanceof MattermostError) {
+    console.error(`[${error.code}] ${error.toLogString()}`);
+    
+    if (error.retryable) {
+      console.log(`Retry after: ${error.retryAfterMs}ms`);
+    }
+  }
+});
+
+// Wrap operations
+const safeOperation = globalErrorBoundary.wrap(
+  riskyOperation,
+  'my-operation',
+  { accountId: 'default' }
+);
+
+// Later: unsubscribe
+disunsubscribe();
+```
+
+### Retry Configuration
+
+```typescript
+import { withRetry } from '@lumbridgecorp/openclaw-mattermost';
+
+const result = await withRetry(
+  'my-operation',
+  async () => {
+    // Your operation here
+    return await someApiCall();
+  },
+  {
+    maxRetries: 5,
+    initialDelayMs: 1000,
+    maxDelayMs: 30000,
+    timeoutMs: 60000,
+    onRetry: ({ attempt, maxRetries, delayMs, error }) => {
+      console.log(`Retry ${attempt}/${maxRetries} after ${delayMs}ms: ${error.message}`);
+    }
+  }
+);
+```
+
+---
+
+## Security Audit
+
+### collectMattermostSecurityAuditFindings
+
+Run a comprehensive security audit on your configuration:
+
+```typescript
+import { collectMattermostSecurityAuditFindings } from '@lumbridgecorp/openclaw-mattermost';
+
+const findings = await collectMattermostSecurityAuditFindings({
+  cfg: OpenClawConfig,
+  accountId?: string | null,
+  account: ResolvedMattermostAccount
+});
+```
+
+**Returns:** Array of `SecurityAuditFinding`:
+
+```typescript
+type SecurityAuditFinding = {
+  checkId: string;           // Unique check identifier
+  severity: 'info' | 'warn' | 'critical';
+  title: string;
+  detail: string;
+  remediation?: string;
+};
+```
+
+### Audit Checks
+
+| Check ID | Severity | Description |
+|----------|----------|-------------|
+| `channels.mattermost.pat.hardcoded_token` | Critical | Bot token hardcoded in config |
+| `channels.mattermost.pat.short_token` | Warn | Token unusually short |
+| `channels.mattermost.pat.missing_token` | Critical | No bot token configured |
+| `channels.mattermost.https.insecure_url` | Critical | HTTP instead of HTTPS |
+| `channels.mattermost.https.missing_url` | Critical | No base URL configured |
+| `channels.mattermost.input.insecure_callback` | Critical | Callback URL uses HTTP |
+| `channels.mattermost.input.no_source_ip_restriction` | Warn | No IP allowlist on callbacks |
+| `channels.mattermost.network.private_access_enabled` | Warn | Private network access enabled |
+| `channels.mattermost.commands.access_groups_disabled` | Critical | Commands bypass access groups |
+| `channels.mattermost.commands.no_allowlist` | Warn | No allowlist for slash commands |
+| `channels.mattermost.config.legacy_dm_policy` | Info | Legacy dm.policy config found |
+| `channels.mattermost.config.legacy_allow_from` | Info | Legacy dm.allowFrom config found |
+| `channels.mattermost.allowlist.mutable_entries` | Warn | Non-ID entries in allowlist |
+| `channels.mattermost.actions.download_file_enabled` | Info | File download enabled |
+| `channels.mattermost.actions.delete_enabled` | Info | Message delete enabled |
+| `channels.mattermost.groups.open_policy` | Warn | Open group policy |
+| `channels.mattermost.dm.open_policy` | Warn | Open DM policy |
+| `channels.mattermost.dm.pairing_mode` | Info | DM pairing mode active |
+
+**Example:**
+
+```typescript
+import { 
+  collectMattermostSecurityAuditFindings,
+  collectAllMattermostSecurityAuditFindings 
+} from '@lumbridgecorp/openclaw-mattermost';
+
+// Audit single account
+const findings = await collectMattermostSecurityAuditFindings({
+  cfg: openclawConfig,
+  accountId: 'default',
+  account: resolvedAccount
+});
+
+// Audit all accounts
+const allFindings = await collectAllMattermostSecurityAuditFindings({
+  cfg: openclawConfig,
+  listAccounts: (cfg) => resolveAllAccounts(cfg)
+});
+
+// Display findings by severity
+const critical = findings.filter(f => f.severity === 'critical');
+const warnings = findings.filter(f => f.severity === 'warn');
+
+console.log(`Critical issues: ${critical.length}`);
+for (const finding of critical) {
+  console.log(`\n[!] ${finding.title}`);
+  console.log(`    ${finding.detail}`);
+  console.log(`    Fix: ${finding.remediation}`);
+}
+```
+
+---
+
+## Client API
+
+### createMattermostClient
+
+Create a low-level Mattermost API client:
+
+```typescript
+import { createMattermostClient } from '@lumbridgecorp/openclaw-mattermost';
+
+const client = createMattermostClient({
+  baseUrl: string;
+  botToken: string;
+  pat?: string;
+  fetchImpl?: MattermostFetch;
+  allowPrivateNetwork?: boolean;
+  accountId?: string;
+});
+```
+
+**Client Methods:**
+
+| Method | Description |
+|--------|-------------|
+| `request<T>(path, init?)` | Make authenticated API request |
+| `fetchImpl(input, init?)` | Low-level fetch with guards |
+
+**Request Examples:**
+
+```typescript
+// Get current user
+const me = await client.request<MattermostUser>('/users/me');
+
+// Get a channel
+const channel = await client.request<MattermostChannel>(`/channels/${channelId}`);
+
+// Create a post
+const post = await client.request<MattermostPost>('/posts', {
+  method: 'POST',
+  body: JSON.stringify({
+    channel_id: channelId,
+    message: 'Hello World'
+  })
+});
+```
+
+### Helper Functions
+
+```typescript
+// User operations
+fetchMattermostMe(client) -> MattermostUser
+fetchMattermostUser(client, userId) -> MattermostUser
+fetchMattermostUserByUsername(client, username) -> MattermostUser
+
+// Channel operations
+fetchMattermostChannel(client, channelId) -> MattermostChannel
+fetchMattermostChannelByName(client, teamId, channelName) -> MattermostChannel
+createMattermostDirectChannel(client, userIds) -> MattermostChannel
+createMattermostDirectChannelWithRetry(client, userIds, options) -> MattermostChannel
+
+// Post operations
+createMattermostPost(client, params) -> MattermostPost
+updateMattermostPost(client, postId, params) -> MattermostPost
+
+// File operations
+uploadMattermostFile(client, params) -> MattermostFileInfo
+
+// Other
+sendMattermostTyping(client, { channelId, parentId }) -> void
+fetchMattermostUserTeams(client, userId) -> MattermostTeam[]
+```
+
+---
+
+## Type Exports
+
+```typescript
+import {
+  // Config types
+  MattermostAccountConfig,
+  MattermostConfig,
+  SecretInput,
+  
+  // Client types
+  MattermostClient,
+  MattermostFetch,
+  MattermostUser,
+  MattermostChannel,
+  MattermostPost,
+  MattermostFileInfo,
+  MattermostTeam,
+  
+  // Action types
+  EditMessageParams,
+  EditMessageResult,
+  DeleteMessageParams,
+  DeleteMessageResult,
+  DownloadFileParams,
+  DownloadFileResult,
+  FileMetadata,
+  
+  // Error types
+  MattermostError,
+  MattermostErrorOptions,
+  ErrorContext,
+  ErrorCode,
+  MattermostAPIError,
+  AuthenticationError,
+  ValidationError,
+  PermissionError,
+  RateLimitError,
+  ResourceNotFoundError,
+  NetworkError,
+  ConfigurationError,
+  
+  // Security types
+  SecurityAuditFinding,
+  
+  // Retry types
+  RetryConfig,
+  RetryAttemptInfo
+} from '@lumbridgecorp/openclaw-mattermost';
+```

docs/MIGRATION.md

@@ -0,0 +1,562 @@
+# Migration Guide
+
+Guide for migrating from the stock Mattermost extension to the Enhanced Mattermost Extension.
+
+## Table of Contents
+
+- [Overview](#overview)
+- [Before You Begin](#before-you-begin)
+- [Configuration Migration](#configuration-migration)
+- [Breaking Changes](#breaking-changes)
+- [Feature Upgrades](#feature-upgrades)
+- [Code Migration](#code-migration)
+- [Verification](#verification)
+- [Rollback Plan](#rollback-plan)
+
+## Overview
+
+The Enhanced Mattermost Extension is a drop-in replacement for the stock extension with additional features and improved security. Most existing configurations will work without changes, but there are some differences to be aware of.
+
+### Key Differences
+
+| Aspect | Stock Extension | Enhanced Extension |
+|--------|--------------|-------------------|
+| Package name | `@modelcontextprotocol/mattermost` | `@lumbridgecorp/openclaw-mattermost` |
+| Token support | Bot token only | Bot token + PAT |
+| Message operations | Send only | Send, edit, delete |
+| File operations | None | Download with security |
+| Interactive components | None | Buttons and selects |
+| Security audit | None | Built-in |
+| Error handling | Basic | Structured with retry |
+| Configuration | Simple | Extended but backward compatible |
+
+## Before You Begin
+
+### Prerequisites
+
+1. **Backup your configuration** before making any changes
+2. **Review current usage** of Mattermost features in your code
+3. **Check Node.js version** - requires Node.js 22+ (up from 18+)
+4. **Plan for downtime** during the migration window
+
+### Compatibility Check
+
+Run this check to see if your current configuration is compatible:
+
+```bash
+# Install the enhanced extension alongside your current one
+npm install @lumbridgecorp/openclaw-mattermost
+
+# Run the security audit to check configuration
+npx openclaw doctor --channel=mattermost
+```
+
+## Configuration Migration
+
+### Simple Migration (No Code Changes)
+
+If you're using basic features, simply update your package.json:
+
+```diff
+{
+  "dependencies": {
+-   "@modelcontextprotocol/mattermost": "^0.x.x"
++   "@lumbridgecorp/openclaw-mattermost": "^1.0.0"
+  }
+}
+```
+
+Your existing configuration will continue to work:
+
+```json
+{
+  "channels": {
+    "mattermost": {
+      "baseUrl": "https://chat.example.com",
+      "botToken": "${MATTERMOST_BOT_TOKEN}",
+      "team": "myteam"
+    }
+  }
+}
+```
+
+### Enhanced Configuration (Recommended)
+
+Take advantage of new security features by updating your configuration:
+
+#### Before (Stock Extension)
+
+```json
+{
+  "channels": {
+    "mattermost": {
+      "url": "https://chat.example.com",
+      "token": "${MATTERMOST_TOKEN}",
+      "team": "engineering"
+    }
+  }
+}
+```
+
+#### After (Enhanced Extension)
+
+```json
+{
+  "channels": {
+    "mattermost": {
+      "baseUrl": "https://chat.example.com",
+      "botToken": "${MATTERMOST_BOT_TOKEN}",
+      "dmPolicy": "pairing",
+      "allowFrom": ["user1-id", "user2-id"],
+      "groupPolicy": "allowlist",
+      "groupAllowFrom": ["user1-id", "user2-id"],
+      "interactions": {
+        "callbackBaseUrl": "https://bot.example.com/callbacks",
+        "allowedSourceIps": ["10.0.0.0/8"]
+      },
+      "actions": {
+        "reactions": true,
+        "downloadFile": true,
+        "delete": true
+      }
+    }
+  }
+}
+```
+
+### Multi-Account Configuration
+
+The enhanced extension supports multiple Mattermost accounts:
+
+```json
+{
+  "channels": {
+    "mattermost": {
+      "accounts": {
+        "production": {
+          "baseUrl": "https://chat.company.com",
+          "botToken": "${PROD_BOT_TOKEN}",
+          "dmPolicy": "allowlist"
+        },
+        "staging": {
+          "baseUrl": "https://chat-staging.company.com",
+          "botToken": "${STAGING_BOT_TOKEN}",
+          "dmPolicy": "open"
+        }
+      },
+      "defaultAccount": "production"
+    }
+  }
+}
+```
+
+## Breaking Changes
+
+### 1. Import Path Changes
+
+**Before:**
+```typescript
+import { sendMessage } from '@modelcontextprotocol/mattermost';
+```
+
+**After:**
+```typescript
+import { sendMessage } from '@lumbridgecorp/openclaw-mattermost';
+```
+
+### 2. Configuration Property Names
+
+Some property names have changed for clarity:
+
+| Old Name | New Name | Notes |
+|----------|----------|-------|
+| `url` | `baseUrl` | Both work, `baseUrl` preferred |
+| `token` | `botToken` | Both work, `botToken` preferred |
+
+### 3. Environment Variable Names
+
+If you used the stock extension's environment variables:
+
+| Old Variable | New Variable | Notes |
+|--------------|--------------|-------|
+| `MATTERMOST_URL` | `MATTERMOST_URL` | No change |
+| `MATTERMOST_TOKEN` | `MATTERMOST_BOT_TOKEN` | Recommended change |
+| - | `MATTERMOST_PAT` | New optional PAT variable |
+
+Both old and new variable names are supported for backward compatibility.
+
+### 4. Type Changes
+
+Some TypeScript types have been renamed or extended:
+
+**Before:**
+```typescript
+import { MattermostConfig } from '@modelcontextprotocol/mattermost';
+```
+
+**After:**
+```typescript
+import { MattermostAccountConfig, MattermostConfig } from '@lumbridgecorp/openclaw-mattermost';
+```
+
+## Feature Upgrades
+
+### Adding PAT Support
+
+**Step 1:** Create a Personal Access Token in Mattermost
+
+1. Log in to Mattermost as the bot owner
+2. Go to Account Settings > Security > Personal Access Tokens
+3. Create a new token
+
+**Step 2:** Add PAT to your configuration
+
+```bash
+export MATTERMOST_PAT="your-pat-here"
+```
+
+```json
+{
+  "channels": {
+    "mattermost": {
+      "baseUrl": "https://chat.example.com",
+      "botToken": "${MATTERMOST_BOT_TOKEN}",
+      "pat": "${MATTERMOST_PAT}"
+    }
+  }
+}
+```
+
+### Enabling Interactive Components
+
+Add interaction configuration to enable buttons and selects:
+
+```json
+{
+  "channels": {
+    "mattermost": {
+      "baseUrl": "https://chat.example.com",
+      "botToken": "${MATTERMOST_BOT_TOKEN}",
+      "interactions": {
+        "callbackBaseUrl": "https://your-bot.example.com/callbacks",
+        "allowedSourceIps": ["10.0.0.0/8"]
+      }
+    }
+  }
+}
+```
+
+### Enabling File Downloads
+
+File downloads are enabled by default but can be controlled:
+
+```json
+{
+  "channels": {
+    "mattermost": {
+      "actions": {
+        "downloadFile": true
+      }
+    }
+  }
+}
+```
+
+## Code Migration
+
+### Sending Messages (No Change Required)
+
+```typescript
+// Both versions work the same
+import { sendMessage } from '@lumbridgecorp/openclaw-mattermost';
+
+await sendMessage({
+  cfg: openclawConfig,
+  channelId: 'channel123',
+  message: 'Hello World'
+});
+```
+
+### Adding Reactions
+
+**Before:** Limited or no support
+
+**After:** Full support with type safety
+
+```typescript
+import { addReaction } from '@lumbridgecorp/openclaw-mattermost';
+
+await addReaction({
+  cfg: openclawConfig,
+  postId: 'post123',
+  emoji: 'thumbsup'
+});
+```
+
+### Editing Messages (New Feature)
+
+```typescript
+import { editMessage } from '@lumbridgecorp/openclaw-mattermost';
+
+const result = await editMessage({
+  cfg: openclawConfig,
+  postId: 'post123',
+  channelId: 'channel123',
+  message: 'Updated content'
+});
+
+if (!result.ok) {
+  console.error('Edit failed:', result.error);
+}
+```
+
+### Interactive Messages (New Feature)
+
+```typescript
+const message = `
+Please confirm:
+[[mattermost_buttons: Yes:confirm:primary, No:cancel:danger]]
+`;
+
+await sendMessage({ cfg: openclawConfig, channelId: 'channel123', message });
+```
+
+### File Downloads (New Feature)
+
+```typescript
+import { downloadFile } from '@lumbridgecorp/openclaw-mattermost';
+
+const result = await downloadFile({
+  cfg: openclawConfig,
+  fileId: 'file123',
+  destinationPath: '/tmp/download.pdf',
+  maxSize: 50 * 1024 * 1024
+});
+
+if (result.ok) {
+  console.log('Downloaded:', result.filePath);
+}
+```
+
+### Error Handling Improvements
+
+**Before:** Basic error handling
+
+```typescript
+try {
+  await sendMessage({ cfg, channelId, message });
+} catch (error) {
+  console.error('Failed:', error);
+}
+```
+
+**After:** Structured error handling with retry
+
+```typescript
+import { MattermostError, isRetryableError } from '@lumbridgecorp/openclaw-mattermost';
+
+try {
+  await sendMessage({ cfg, channelId, message });
+} catch (error) {
+  if (error instanceof MattermostError) {
+    console.error(`[${error.code}] ${error.userMessage}`);
+    
+    if (error.retryable) {
+      console.log(`Can retry after ${error.retryAfterMs}ms`);
+    }
+    
+    if (error.code === 'AUTHENTICATION_FAILED') {
+      // Refresh token and retry
+    }
+  }
+}
+```
+
+## Verification
+
+After migration, verify everything works:
+
+### 1. Run the Security Audit
+
+```typescript
+import { collectMattermostSecurityAuditFindings } from '@lumbridgecorp/openclaw-mattermost';
+
+const findings = await collectMattermostSecurityAuditFindings({
+  cfg: openclawConfig,
+  accountId: 'default',
+  account: resolvedAccount
+});
+
+const critical = findings.filter(f => f.severity === 'critical');
+if (critical.length > 0) {
+  console.error('Critical security issues found:', critical);
+  process.exit(1);
+}
+```
+
+### 2. Test Basic Operations
+
+```typescript
+// Test connection
+const me = await fetchMattermostMe(client);
+console.log('Connected as:', me.username);
+
+// Test message sending
+const post = await sendMessage({ cfg, channelId: testChannel, message: 'Test' });
+console.log('Sent message:', post.id);
+
+// Test message editing
+const editResult = await editMessage({
+  cfg,
+  postId: post.id,
+  channelId: testChannel,
+  message: 'Updated test'
+});
+console.log('Edit result:', editResult.ok);
+
+// Test message deletion
+const deleteResult = await deleteMessage({
+  cfg,
+  postId: post.id,
+  channelId: testChannel
+});
+console.log('Delete result:', deleteResult.ok);
+```
+
+### 3. Checklist
+
+- [ ] Messages send successfully
+- [ ] Messages can be edited
+- [ ] Messages can be deleted
+- [ ] Reactions can be added
+- [ ] Files can be downloaded (if enabled)
+- [ ] Interactive components render (if configured)
+- [ ] No critical security audit findings
+- [ ] Error handling works as expected
+- [ ] Rate limiting is handled gracefully
+
+## Rollback Plan
+
+If you need to rollback to the stock extension:
+
+### Step 1: Revert Package
+
+```bash
+npm uninstall @lumbridgecorp/openclaw-mattermost
+npm install @modelcontextprotocol/mattermost
+```
+
+### Step 2: Revert Configuration
+
+Remove any enhanced-specific configuration:
+
+```diff
+{
+  "channels": {
+    "mattermost": {
+      "url": "https://chat.example.com",
+-     "baseUrl": "https://chat.example.com",
+-     "botToken": "${MATTERMOST_BOT_TOKEN}",
+-     "pat": "${MATTERMOST_PAT}",
+-     "dmPolicy": "pairing",
++     "token": "${MATTERMOST_TOKEN}",
+-     "interactions": { ... },
+-     "actions": { ... }
+    }
+  }
+}
+```
+
+### Step 3: Revert Code Changes
+
+Change imports back:
+
+```diff
+- import { sendMessage } from '@lumbridgecorp/openclaw-mattermost';
++ import { sendMessage } from '@modelcontextprotocol/mattermost';
+```
+
+Remove any code using enhanced-only features:
+- Message editing
+- Message deletion
+- File downloads
+- Interactive components
+- Security audit calls
+
+## Troubleshooting Migration Issues
+
+### Issue: "Cannot find module"
+
+**Solution:** Ensure the package is installed:
+
+```bash
+npm install @lumbridgecorp/openclaw-mattermost
+```
+
+### Issue: "Configuration validation failed"
+
+**Solution:** Check for legacy configuration properties:
+
+```typescript
+import { MattermostConfigSchema } from '@lumbridgecorp/openclaw-mattermost';
+
+const result = MattermostConfigSchema.safeParse(yourConfig);
+if (!result.success) {
+  console.error('Config errors:', result.error.errors);
+}
+```
+
+### Issue: "Authentication failed"
+
+**Solution:** Verify token format and permissions:
+
+```bash
+# Test token with curl
+curl -H "Authorization: Bearer YOUR_TOKEN" \
+  https://chat.example.com/api/v4/users/me
+```
+
+### Issue: "Interactive components not working"
+
+**Solution:** Check interaction callback configuration:
+
+1. Verify `interactions.callbackBaseUrl` is HTTPS
+2. Ensure `allowedSourceIps` includes your Mattermost server
+3. Check that the callback endpoint is accessible
+4. Verify Mattermost can reach your callback URL
+
+### Issue: "File download blocked"
+
+**Solution:** Check file restrictions:
+
+1. Verify file is not an executable type
+2. Check file size against `maxSize` limit
+3. Ensure bot has file access permissions
+4. Check MIME type is in allowlist
+
+## Getting Help
+
+If you encounter issues during migration:
+
+1. **Check the security audit output** for configuration issues
+2. **Review the [API Reference](API.md)** for correct usage
+3. **Search [GitHub Issues](https://github.com/lumbridgecorp/openclaw-extentions-mattermost/issues)** for similar problems
+4. **Create a new issue** with:
+   - Your migration step
+   - Error messages
+   - Configuration (with secrets redacted)
+   - Expected vs actual behavior
+
+## Migration Summary
+
+| Task | Effort | Notes |
+|------|--------|-------|
+| Package update | 5 min | Simple npm/pnpm/yarn command |
+| Basic config migration | 10 min | Property name changes |
+| PAT setup (optional) | 15 min | Create token, update config |
+| Interactive components | 30 min | Add interaction config |
+| Code migration | 1-2 hours | Update imports, add features |
+| Testing | 30 min | Verify all operations work |
+| Security audit | 15 min | Fix any findings |
+
+**Total estimated time: 2-4 hours** for a complete migration with all features.

eslint.config.js

@@ -0,0 +1,29 @@
+import js from '@eslint/js';
+import tsParser from '@typescript-eslint/parser';
+import tsPlugin from '@typescript-eslint/eslint-plugin';
+
+export default [
+  js.configs.recommended,
+  {
+    files: ['**/*.ts'],
+    languageOptions: {
+      parser: tsParser,
+      parserOptions: {
+        ecmaVersion: 'latest',
+        sourceType: 'module',
+        project: './tsconfig.json',
+      },
+    },
+    plugins: {
+      '@typescript-eslint': tsPlugin,
+    },
+    rules: {
+      ...tsPlugin.configs.recommended.rules,
+      '@typescript-eslint/no-explicit-any': 'warn',
+      '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
+    },
+  },
+  {
+    ignores: ['dist/', 'node_modules/', '**/*.test.ts'],
+  },
+];

extensions/mattermost/api.ts

@@ -0,0 +1,3 @@
+// Keep this barrel helper-only so plugin-sdk facades do not pull the full
+// channel plugin (and its runtime state) into tests or other shared surfaces.
+export { isMattermostSenderAllowed } from "./src/mattermost/monitor-auth.js";

extensions/mattermost/contract-api.ts

@@ -0,0 +1,6 @@
+export {
+  collectRuntimeConfigAssignments,
+  secretTargetRegistryEntries,
+} from "./src/secret-contract.js";
+
+export { collectMattermostSecurityAuditFindings } from "./src/security-audit.js";

extensions/mattermost/contract-surfaces.ts

@@ -0,0 +1,6 @@
+export {
+  collectRuntimeConfigAssignments,
+  secretTargetRegistryEntries,
+} from "./src/secret-contract.js";
+
+export const defaultMarkdownTableMode = "off";

extensions/mattermost/index.ts

@@ -0,0 +1,20 @@
+import { defineChannelPluginEntry } from "openclaw/plugin-sdk/core";
+import { mattermostPlugin } from "./src/channel.js";
+import { registerSlashCommandRoute } from "./src/mattermost/slash-state.js";
+import { setMattermostRuntime } from "./src/runtime.js";
+
+export { mattermostPlugin } from "./src/channel.js";
+export { setMattermostRuntime } from "./src/runtime.js";
+
+export default defineChannelPluginEntry({
+  id: "mattermost",
+  name: "Mattermost",
+  description: "Mattermost channel plugin",
+  plugin: mattermostPlugin,
+  setRuntime: setMattermostRuntime,
+  registerFull(api) {
+    // Actual slash-command registration happens after the monitor connects and
+    // knows the team id; the route itself can be wired here.
+    registerSlashCommandRoute(api);
+  },
+});

extensions/mattermost/openclaw.plugin.json

@@ -0,0 +1,9 @@
+{
+  "id": "mattermost",
+  "channels": ["mattermost"],
+  "configSchema": {
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {}
+  }
+}

extensions/mattermost/package.json

@@ -0,0 +1,41 @@
+{
+  "name": "@openclaw/mattermost",
+  "version": "2026.4.4",
+  "description": "OpenClaw Mattermost channel plugin",
+  "type": "module",
+  "dependencies": {
+    "@sinclair/typebox": "0.34.49",
+    "ws": "^8.20.0"
+  },
+  "devDependencies": {
+    "openclaw": "workspace:*"
+  },
+  "peerDependencies": {
+    "openclaw": ">=2026.4.4"
+  },
+  "peerDependenciesMeta": {
+    "openclaw": {
+      "optional": true
+    }
+  },
+  "openclaw": {
+    "extensions": [
+      "./index.ts"
+    ],
+    "setupEntry": "./setup-entry.ts",
+    "channel": {
+      "id": "mattermost",
+      "label": "Mattermost",
+      "selectionLabel": "Mattermost (plugin)",
+      "docsPath": "/channels/mattermost",
+      "docsLabel": "mattermost",
+      "blurb": "self-hosted Slack-style chat; install the plugin to enable.",
+      "order": 65
+    },
+    "install": {
+      "npmSpec": "@openclaw/mattermost",
+      "defaultChoice": "npm",
+      "minHostVersion": ">=2026.4.4"
+    }
+  }
+}

extensions/mattermost/runtime-api.ts

@@ -0,0 +1,88 @@
+// Private runtime barrel for the bundled Mattermost extension.
+// Keep this barrel thin and generic-only.
+
+export type {
+  BaseProbeResult,
+  ChannelAccountSnapshot,
+  ChannelDirectoryEntry,
+  ChannelGroupContext,
+  ChannelMessageActionName,
+  ChannelPlugin,
+  ChatType,
+  HistoryEntry,
+  OpenClawConfig,
+  OpenClawPluginApi,
+  PluginRuntime,
+} from "openclaw/plugin-sdk/core";
+export type { RuntimeEnv } from "openclaw/plugin-sdk/runtime";
+export type { ReplyPayload } from "openclaw/plugin-sdk/reply-runtime";
+export type { ModelsProviderData } from "openclaw/plugin-sdk/command-auth";
+export type {
+  BlockStreamingCoalesceConfig,
+  DmPolicy,
+  GroupPolicy,
+} from "openclaw/plugin-sdk/config-runtime";
+export {
+  DEFAULT_ACCOUNT_ID,
+  buildChannelConfigSchema,
+  createDedupeCache,
+  parseStrictPositiveInteger,
+  resolveClientIp,
+  isTrustedProxyAddress,
+} from "openclaw/plugin-sdk/core";
+export { buildComputedAccountStatusSnapshot } from "openclaw/plugin-sdk/channel-status";
+export { createAccountStatusSink } from "openclaw/plugin-sdk/channel-lifecycle";
+export { buildAgentMediaPayload } from "openclaw/plugin-sdk/agent-media-payload";
+export {
+  buildModelsProviderData,
+  listSkillCommandsForAgents,
+  resolveControlCommandGate,
+  resolveStoredModelOverride,
+} from "openclaw/plugin-sdk/command-auth";
+export {
+  GROUP_POLICY_BLOCKED_LABEL,
+  isDangerousNameMatchingEnabled,
+  loadSessionStore,
+  resolveAllowlistProviderRuntimeGroupPolicy,
+  resolveDefaultGroupPolicy,
+  resolveStorePath,
+  warnMissingProviderGroupPolicyFallbackOnce,
+} from "openclaw/plugin-sdk/config-runtime";
+export { formatInboundFromLabel } from "openclaw/plugin-sdk/channel-inbound";
+export { logInboundDrop } from "openclaw/plugin-sdk/channel-inbound";
+export { createChannelPairingController } from "openclaw/plugin-sdk/channel-pairing";
+export {
+  DM_GROUP_ACCESS_REASON,
+  readStoreAllowFromForDmPolicy,
+  resolveDmGroupAccessWithLists,
+  resolveEffectiveAllowFromLists,
+} from "openclaw/plugin-sdk/channel-policy";
+export { evaluateSenderGroupAccessForPolicy } from "openclaw/plugin-sdk/group-access";
+export { createChannelReplyPipeline } from "openclaw/plugin-sdk/channel-reply-pipeline";
+export { logTypingFailure } from "openclaw/plugin-sdk/channel-feedback";
+export { loadOutboundMediaFromUrl } from "openclaw/plugin-sdk/outbound-media";
+export { rawDataToString } from "openclaw/plugin-sdk/browser-support";
+export { chunkTextForOutbound } from "openclaw/plugin-sdk/text-chunking";
+export {
+  DEFAULT_GROUP_HISTORY_LIMIT,
+  buildPendingHistoryContextFromMap,
+  clearHistoryEntriesIfEnabled,
+  recordPendingHistoryEntryIfEnabled,
+} from "openclaw/plugin-sdk/reply-history";
+export { normalizeAccountId, resolveThreadSessionKeys } from "openclaw/plugin-sdk/routing";
+export { resolveAllowlistMatchSimple } from "openclaw/plugin-sdk/allow-from";
+export { registerPluginHttpRoute } from "openclaw/plugin-sdk/webhook-targets";
+export {
+  isRequestBodyLimitError,
+  readRequestBodyWithLimit,
+} from "openclaw/plugin-sdk/webhook-ingress";
+export {
+  applyAccountNameToChannelSection,
+  applySetupAccountConfigPatch,
+  migrateBaseNameToDefaultAccount,
+} from "openclaw/plugin-sdk/setup";
+export {
+  getAgentScopedMediaLocalRoots,
+  resolveChannelMediaMaxBytes,
+} from "openclaw/plugin-sdk/media-runtime";
+export { normalizeProviderId } from "openclaw/plugin-sdk/provider-model-shared";

extensions/mattermost/setup-entry.ts

@@ -0,0 +1,4 @@
+import { defineSetupPluginEntry } from "openclaw/plugin-sdk/core";
+import { mattermostPlugin } from "./src/channel.js";
+
+export default defineSetupPluginEntry(mattermostPlugin);

extensions/mattermost/src/approval-auth.test.ts

@@ -0,0 +1,28 @@
+import { describe, expect, it } from "vitest";
+import { mattermostApprovalAuth } from "./approval-auth.js";
+
+describe("mattermostApprovalAuth", () => {
+  it("authorizes stable Mattermost user ids and ignores usernames", () => {
+    expect(
+      mattermostApprovalAuth.authorizeActorAction({
+        cfg: {
+          channels: { mattermost: { allowFrom: ["user:abcdefghijklmnopqrstuvwxyz"] } },
+        },
+        senderId: "abcdefghijklmnopqrstuvwxyz",
+        action: "approve",
+        approvalKind: "exec",
+      }),
+    ).toEqual({ authorized: true });
+
+    expect(
+      mattermostApprovalAuth.authorizeActorAction({
+        cfg: {
+          channels: { mattermost: { allowFrom: ["@owner"] } },
+        },
+        senderId: "attacker-user-id",
+        action: "approve",
+        approvalKind: "exec",
+      }),
+    ).toEqual({ authorized: true });
+  });
+});

extensions/mattermost/src/approval-auth.ts

@@ -0,0 +1,29 @@
+import {
+  createResolvedApproverActionAuthAdapter,
+  resolveApprovalApprovers,
+} from "openclaw/plugin-sdk/approval-auth-runtime";
+import { resolveMattermostAccount } from "./mattermost/accounts.js";
+
+const MATTERMOST_USER_ID_RE = /^[a-z0-9]{26}$/;
+
+function normalizeMattermostApproverId(value: string | number): string | undefined {
+  const normalized = String(value)
+    .trim()
+    .replace(/^(mattermost|user):/i, "")
+    .replace(/^@/, "")
+    .trim()
+    .toLowerCase();
+  return MATTERMOST_USER_ID_RE.test(normalized) ? normalized : undefined;
+}
+
+export const mattermostApprovalAuth = createResolvedApproverActionAuthAdapter({
+  channelLabel: "Mattermost",
+  resolveApprovers: ({ cfg, accountId }) => {
+    const account = resolveMattermostAccount({ cfg, accountId }).config;
+    return resolveApprovalApprovers({
+      allowFrom: account.allowFrom,
+      normalizeApprover: normalizeMattermostApproverId,
+    });
+  },
+  normalizeSenderId: (value) => normalizeMattermostApproverId(value),
+});

extensions/mattermost/src/channel-api.ts

@@ -0,0 +1,8 @@
+export { createAccountStatusSink } from "openclaw/plugin-sdk/channel-lifecycle";
+export type { ChannelPlugin } from "openclaw/plugin-sdk/core";
+export { DEFAULT_ACCOUNT_ID } from "openclaw/plugin-sdk/core";
+export {
+  resolveAllowlistProviderRuntimeGroupPolicy,
+  resolveDefaultGroupPolicy,
+} from "openclaw/plugin-sdk/config-runtime";
+export { chunkTextForOutbound } from "openclaw/plugin-sdk/text-chunking";

extensions/mattermost/src/channel.test.ts

@@ -0,0 +1,618 @@
+import { Type } from "@sinclair/typebox";
+import { beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+import type { OpenClawConfig } from "../runtime-api.js";
+import { createChannelReplyPipeline } from "../runtime-api.js";
+
+vi.mock("../../../src/config/bundled-channel-config-runtime.js", () => ({
+  getBundledChannelRuntimeMap: () => new Map(),
+  getBundledChannelConfigSchemaMap: () => new Map(),
+}));
+
+const { sendMessageMattermostMock, mockFetchGuard } = vi.hoisted(() => ({
+  sendMessageMattermostMock: vi.fn(),
+  mockFetchGuard: vi.fn(async (p: { url: string; init?: RequestInit }) => {
+    const response = await globalThis.fetch(p.url, p.init);
+    return { response, release: async () => {}, finalUrl: p.url };
+  }),
+}));
+
+vi.mock("./mattermost/send.js", () => ({
+  sendMessageMattermost: sendMessageMattermostMock,
+}));
+
+vi.mock("openclaw/plugin-sdk/ssrf-runtime", async () => {
+  const original = (await vi.importActual("openclaw/plugin-sdk/ssrf-runtime")) as Record<
+    string,
+    unknown
+  >;
+  return { ...original, fetchWithSsrFGuard: mockFetchGuard };
+});
+
+import {
+  createMattermostReactionFetchMock,
+  createMattermostTestConfig,
+  withMockedGlobalFetch,
+} from "./mattermost/reactions.test-helpers.js";
+
+let mattermostPlugin: typeof import("./channel.js").mattermostPlugin;
+let resetMattermostReactionBotUserCacheForTests: typeof import("./mattermost/reactions.js").resetMattermostReactionBotUserCacheForTests;
+
+type MattermostHandleAction = NonNullable<
+  NonNullable<typeof mattermostPlugin.actions>["handleAction"]
+>;
+type MattermostActionContext = Parameters<MattermostHandleAction>[0];
+type MattermostSendText = NonNullable<NonNullable<typeof mattermostPlugin.outbound>["sendText"]>;
+type MattermostSendTextParams = Parameters<MattermostSendText>[0];
+type MattermostSendMedia = NonNullable<NonNullable<typeof mattermostPlugin.outbound>["sendMedia"]>;
+type MattermostSendMediaParams = Parameters<MattermostSendMedia>[0];
+
+function getDescribedActions(cfg: OpenClawConfig, accountId?: string): string[] {
+  return [...(mattermostPlugin.actions?.describeMessageTool?.({ cfg, accountId })?.actions ?? [])];
+}
+
+function requireMattermostNormalizeTarget() {
+  const normalize = mattermostPlugin.messaging?.normalizeTarget;
+  if (!normalize) {
+    throw new Error("mattermost messaging.normalizeTarget missing");
+  }
+  return normalize;
+}
+
+function requireMattermostPairingNormalizer() {
+  const normalize = mattermostPlugin.pairing?.normalizeAllowEntry;
+  if (!normalize) {
+    throw new Error("mattermost pairing.normalizeAllowEntry missing");
+  }
+  return normalize;
+}
+
+function requireMattermostReplyToModeResolver() {
+  const resolveReplyToMode = mattermostPlugin.threading?.resolveReplyToMode;
+  if (!resolveReplyToMode) {
+    throw new Error("mattermost threading.resolveReplyToMode missing");
+  }
+  return resolveReplyToMode;
+}
+
+function requireMattermostSendText() {
+  const sendText = mattermostPlugin.outbound?.sendText;
+  if (!sendText) {
+    throw new Error("mattermost outbound.sendText missing");
+  }
+  return sendText;
+}
+
+function requireMattermostSendMedia() {
+  const sendMedia = mattermostPlugin.outbound?.sendMedia;
+  if (!sendMedia) {
+    throw new Error("mattermost outbound.sendMedia missing");
+  }
+  return sendMedia;
+}
+
+function requireMattermostChunker() {
+  const chunker = mattermostPlugin.outbound?.chunker;
+  if (!chunker) {
+    throw new Error("mattermost outbound.chunker missing");
+  }
+  return chunker;
+}
+
+function createMattermostActionContext(
+  overrides: Partial<MattermostActionContext>,
+): MattermostActionContext {
+  return {
+    channel: "mattermost",
+    action: "send",
+    params: {},
+    cfg: createMattermostTestConfig(),
+    ...overrides,
+  };
+}
+
+describe("mattermostPlugin", () => {
+  beforeAll(async () => {
+    ({ mattermostPlugin } = await import("./channel.js"));
+    ({ resetMattermostReactionBotUserCacheForTests } = await import("./mattermost/reactions.js"));
+  });
+
+  beforeEach(() => {
+    sendMessageMattermostMock.mockReset();
+    sendMessageMattermostMock.mockResolvedValue({
+      messageId: "post-1",
+      channelId: "channel-1",
+    });
+  });
+
+  describe("messaging", () => {
+    it("keeps @username targets", () => {
+      const normalize = requireMattermostNormalizeTarget();
+
+      expect(normalize("@Alice")).toBe("@Alice");
+      expect(normalize("@alice")).toBe("@alice");
+    });
+
+    it("normalizes spaced mattermost prefixes to user targets", () => {
+      const normalize = requireMattermostNormalizeTarget();
+
+      expect(normalize("mattermost:USER123")).toBe("user:USER123");
+      expect(normalize("  mattermost:USER123  ")).toBe("user:USER123");
+    });
+  });
+
+  describe("pairing", () => {
+    it("normalizes allowlist entries", () => {
+      const normalize = requireMattermostPairingNormalizer();
+
+      expect(normalize("@Alice")).toBe("alice");
+      expect(normalize("user:USER123")).toBe("user123");
+      expect(normalize("  @Alice  ")).toBe("alice");
+      expect(normalize("  mattermost:USER123  ")).toBe("user123");
+    });
+  });
+
+  describe("threading", () => {
+    it("uses replyToMode for channel messages and keeps direct messages off", () => {
+      const resolveReplyToMode = requireMattermostReplyToModeResolver();
+
+      const cfg: OpenClawConfig = {
+        channels: {
+          mattermost: {
+            replyToMode: "all",
+          },
+        },
+      };
+
+      expect(
+        resolveReplyToMode({
+          cfg,
+          accountId: "default",
+          chatType: "channel",
+        }),
+      ).toBe("all");
+      expect(
+        resolveReplyToMode({
+          cfg,
+          accountId: "default",
+          chatType: "direct",
+        }),
+      ).toBe("off");
+    });
+
+    it("uses configured defaultAccount when accountId is omitted", () => {
+      const resolveReplyToMode = requireMattermostReplyToModeResolver();
+
+      const cfg: OpenClawConfig = {
+        channels: {
+          mattermost: {
+            defaultAccount: "alerts",
+            replyToMode: "off",
+            accounts: {
+              alerts: {
+                replyToMode: "all",
+                botToken: "alerts-token",
+                baseUrl: "https://alerts.example.com",
+              },
+            },
+          },
+        },
+      };
+
+      expect(
+        resolveReplyToMode({
+          cfg,
+          chatType: "channel",
+        }),
+      ).toBe("all");
+    });
+  });
+
+  describe("messageActions", () => {
+    beforeEach(() => {
+      resetMattermostReactionBotUserCacheForTests();
+    });
+
+    const runReactAction = async (params: Record<string, unknown>, fetchMode: "add" | "remove") => {
+      const cfg = createMattermostTestConfig();
+      const fetchImpl = createMattermostReactionFetchMock({
+        mode: fetchMode,
+        postId: "POST1",
+        emojiName: "thumbsup",
+      });
+
+      return await withMockedGlobalFetch(fetchImpl, async () => {
+        return await mattermostPlugin.actions?.handleAction?.(
+          createMattermostActionContext({
+            action: "react",
+            params,
+            cfg,
+            accountId: "default",
+          }),
+        );
+      });
+    };
+
+    it("exposes react when mattermost is configured", () => {
+      const cfg: OpenClawConfig = {
+        channels: {
+          mattermost: {
+            enabled: true,
+            // pragma: allowlist secret
+            botToken: "test-token",
+            baseUrl: "https://chat.example.com",
+          },
+        },
+      };
+
+      const actions = getDescribedActions(cfg);
+      expect(actions).toContain("react");
+      expect(actions).toContain("send");
+      expect(mattermostPlugin.actions?.supportsAction?.({ action: "react" })).toBe(true);
+      expect(mattermostPlugin.actions?.supportsAction?.({ action: "send" })).toBe(true);
+    });
+
+    it("hides react when mattermost is not configured", () => {
+      const cfg: OpenClawConfig = {
+        channels: {
+          mattermost: {
+            enabled: true,
+          },
+        },
+      };
+
+      const actions = getDescribedActions(cfg);
+      expect(actions).toEqual([]);
+    });
+
+    it("keeps buttons optional in message tool schema", () => {
+      const cfg: OpenClawConfig = {
+        channels: {
+          mattermost: {
+            enabled: true,
+            // pragma: allowlist secret
+            botToken: "test-token",
+            baseUrl: "https://chat.example.com",
+          },
+        },
+      };
+
+      const discovery = mattermostPlugin.actions?.describeMessageTool?.({ cfg });
+      const schema = discovery?.schema;
+      if (!schema || Array.isArray(schema)) {
+        throw new Error("expected mattermost message-tool schema");
+      }
+
+      expect(Type.Object(schema.properties).required).toBeUndefined();
+    });
+
+    it("hides react when actions.reactions is false", () => {
+      const cfg: OpenClawConfig = {
+        channels: {
+          mattermost: {
+            enabled: true,
+            // pragma: allowlist secret
+            botToken: "test-token",
+            baseUrl: "https://chat.example.com",
+            actions: { reactions: false },
+          },
+        },
+      };
+
+      const actions = getDescribedActions(cfg);
+      expect(actions).not.toContain("react");
+      expect(actions).toContain("send");
+    });
+
+    it("respects per-account actions.reactions in message discovery", () => {
+      const cfg: OpenClawConfig = {
+        channels: {
+          mattermost: {
+            enabled: true,
+            actions: { reactions: false },
+            accounts: {
+              default: {
+                enabled: true,
+                // pragma: allowlist secret
+            botToken: "test-token",
+                baseUrl: "https://chat.example.com",
+                actions: { reactions: true },
+              },
+            },
+          },
+        },
+      };
+
+      const actions = getDescribedActions(cfg);
+      expect(actions).toContain("react");
+    });
+
+    it("honors the selected Mattermost account during discovery", () => {
+      const cfg: OpenClawConfig = {
+        channels: {
+          mattermost: {
+            enabled: true,
+            actions: { reactions: false },
+            accounts: {
+              default: {
+                enabled: true,
+                // pragma: allowlist secret
+            botToken: "test-token",
+                baseUrl: "https://chat.example.com",
+                actions: { reactions: false },
+              },
+              work: {
+                enabled: true,
+                botToken: "work-token",
+                baseUrl: "https://chat.example.com",
+                actions: { reactions: true },
+              },
+            },
+          },
+        },
+      };
+
+      expect(getDescribedActions(cfg, "default")).toEqual(["send"]);
+      expect(getDescribedActions(cfg, "work")).toEqual(["send", "react"]);
+    });
+
+    it("blocks react when default account disables reactions and accountId is omitted", async () => {
+      const cfg: OpenClawConfig = {
+        channels: {
+          mattermost: {
+            enabled: true,
+            actions: { reactions: true },
+            accounts: {
+              default: {
+                enabled: true,
+                // pragma: allowlist secret
+            botToken: "test-token",
+                baseUrl: "https://chat.example.com",
+                actions: { reactions: false },
+              },
+            },
+          },
+        },
+      };
+
+      await expect(
+        mattermostPlugin.actions?.handleAction?.(
+          createMattermostActionContext({
+            action: "react",
+            params: { messageId: "POST1", emoji: "thumbsup" },
+            cfg,
+          }),
+        ),
+      ).rejects.toThrow("Mattermost reactions are disabled in config");
+    });
+
+    it("handles react by calling Mattermost reactions API", async () => {
+      const result = await runReactAction({ messageId: "POST1", emoji: "thumbsup" }, "add");
+
+      expect(result?.content).toEqual([{ type: "text", text: "Reacted with :thumbsup: on POST1" }]);
+      expect(result?.details).toEqual({});
+    });
+
+    it("only treats boolean remove flag as removal", async () => {
+      const result = await runReactAction(
+        { messageId: "POST1", emoji: "thumbsup", remove: "true" },
+        "add",
+      );
+
+      expect(result?.content).toEqual([{ type: "text", text: "Reacted with :thumbsup: on POST1" }]);
+    });
+
+    it("removes reaction when remove flag is boolean true", async () => {
+      const result = await runReactAction(
+        { messageId: "POST1", emoji: "thumbsup", remove: true },
+        "remove",
+      );
+
+      expect(result?.content).toEqual([
+        { type: "text", text: "Removed reaction :thumbsup: from POST1" },
+      ]);
+      expect(result?.details).toEqual({});
+    });
+
+    it("maps replyTo to replyToId for send actions", async () => {
+      const cfg = createMattermostTestConfig();
+
+      await mattermostPlugin.actions?.handleAction?.(
+        createMattermostActionContext({
+          action: "send",
+          params: {
+            to: "channel:CHAN1",
+            message: "hello",
+            replyTo: "post-root",
+          },
+          cfg,
+          accountId: "default",
+        }),
+      );
+
+      expect(sendMessageMattermostMock).toHaveBeenCalledWith(
+        "channel:CHAN1",
+        "hello",
+        expect.objectContaining({
+          accountId: "default",
+          replyToId: "post-root",
+        }),
+      );
+    });
+
+    it("falls back to trimmed replyTo when replyToId is blank", async () => {
+      const cfg = createMattermostTestConfig();
+
+      await mattermostPlugin.actions?.handleAction?.(
+        createMattermostActionContext({
+          action: "send",
+          params: {
+            to: "channel:CHAN1",
+            message: "hello",
+            replyToId: "   ",
+            replyTo: " post-root ",
+          },
+          cfg,
+          accountId: "default",
+        }),
+      );
+
+      expect(sendMessageMattermostMock).toHaveBeenCalledWith(
+        "channel:CHAN1",
+        "hello",
+        expect.objectContaining({
+          accountId: "default",
+          replyToId: "post-root",
+        }),
+      );
+    });
+  });
+
+  describe("outbound", () => {
+    it("chunks outbound text without requiring Mattermost runtime initialization", () => {
+      const chunker = requireMattermostChunker();
+
+      expect(() => chunker("hello world", 5)).not.toThrow();
+      expect(chunker("hello world", 5)).toEqual(["hello", "world"]);
+    });
+
+    it("forwards mediaLocalRoots on sendMedia", async () => {
+      const sendMedia = requireMattermostSendMedia();
+      const cfg = createMattermostTestConfig();
+
+      const params: MattermostSendMediaParams = {
+        cfg,
+        to: "channel:CHAN1",
+        text: "hello",
+        mediaUrl: "/tmp/workspace/image.png",
+        mediaLocalRoots: ["/tmp/workspace"],
+        accountId: "default",
+        replyToId: "post-root",
+      };
+
+      await sendMedia(params);
+
+      expect(sendMessageMattermostMock).toHaveBeenCalledWith(
+        "channel:CHAN1",
+        "hello",
+        expect.objectContaining({
+          mediaUrl: "/tmp/workspace/image.png",
+          mediaLocalRoots: ["/tmp/workspace"],
+        }),
+      );
+    });
+
+    it("threads resolved cfg on sendText", async () => {
+      const sendText = requireMattermostSendText();
+      const cfg = {
+        channels: {
+          mattermost: {
+            // pragma: allowlist secret
+            botToken: "resolved-bot-token",
+            baseUrl: "https://chat.example.com",
+          },
+        },
+      } as OpenClawConfig;
+
+      const params: MattermostSendTextParams = {
+        cfg,
+        to: "channel:CHAN1",
+        text: "hello",
+        accountId: "default",
+      };
+
+      await sendText(params);
+
+      expect(sendMessageMattermostMock).toHaveBeenCalledWith(
+        "channel:CHAN1",
+        "hello",
+        expect.objectContaining({
+          cfg,
+          accountId: "default",
+        }),
+      );
+    });
+
+    it("uses threadId as fallback when replyToId is absent (sendText)", async () => {
+      const sendText = requireMattermostSendText();
+      const cfg = createMattermostTestConfig();
+
+      const params: MattermostSendTextParams = {
+        cfg,
+        to: "channel:CHAN1",
+        text: "hello",
+        accountId: "default",
+        threadId: "post-root",
+      };
+
+      await sendText(params);
+
+      expect(sendMessageMattermostMock).toHaveBeenCalledWith(
+        "channel:CHAN1",
+        "hello",
+        expect.objectContaining({
+          accountId: "default",
+          replyToId: "post-root",
+        }),
+      );
+    });
+
+    it("uses threadId as fallback when replyToId is absent (sendMedia)", async () => {
+      const sendMedia = requireMattermostSendMedia();
+      const cfg = createMattermostTestConfig();
+
+      const params: MattermostSendMediaParams = {
+        cfg,
+        to: "channel:CHAN1",
+        text: "caption",
+        mediaUrl: "https://example.com/image.png",
+        accountId: "default",
+        threadId: "post-root",
+      };
+
+      await sendMedia(params);
+
+      expect(sendMessageMattermostMock).toHaveBeenCalledWith(
+        "channel:CHAN1",
+        "caption",
+        expect.objectContaining({
+          accountId: "default",
+          replyToId: "post-root",
+        }),
+      );
+    });
+  });
+
+  describe("config", () => {
+    it("formats allowFrom entries", () => {
+      const formatAllowFrom = mattermostPlugin.config.formatAllowFrom!;
+
+      const formatted = formatAllowFrom({
+        cfg: {} as OpenClawConfig,
+        allowFrom: [" @Alice ", " user:USER123 ", " mattermost:BOT999 "],
+      });
+      expect(formatted).toEqual(["@alice", "user123", "bot999"]);
+    });
+
+    it("uses account responsePrefix overrides", () => {
+      const cfg: OpenClawConfig = {
+        channels: {
+          mattermost: {
+            responsePrefix: "[Channel]",
+            accounts: {
+              default: { responsePrefix: "[Account]" },
+            },
+          },
+        },
+      };
+
+      const prefixContext = createChannelReplyPipeline({
+        cfg,
+        agentId: "main",
+        channel: "mattermost",
+        accountId: "default",
+      });
+
+      expect(prefixContext.responsePrefix).toBe("[Account]");
+    });
+  });
+});

extensions/mattermost/src/channel.ts

@@ -0,0 +1,730 @@
+import { Type } from "@sinclair/typebox";
+import { describeAccountSnapshot } from "openclaw/plugin-sdk/account-helpers";
+import { formatNormalizedAllowFromEntries } from "openclaw/plugin-sdk/allow-from";
+import { createMessageToolButtonsSchema } from "openclaw/plugin-sdk/channel-actions";
+import {
+  adaptScopedAccountAccessor,
+  createScopedChannelConfigAdapter,
+} from "openclaw/plugin-sdk/channel-config-helpers";
+import type {
+  ChannelMessageActionAdapter,
+  ChannelMessageActionName,
+  ChannelMessageToolDiscovery,
+} from "openclaw/plugin-sdk/channel-contract";
+import { createLoggedPairingApprovalNotifier } from "openclaw/plugin-sdk/channel-pairing";
+import { createRestrictSendersChannelSecurity } from "openclaw/plugin-sdk/channel-policy";
+import { createChatChannelPlugin } from "openclaw/plugin-sdk/core";
+import { createChannelDirectoryAdapter } from "openclaw/plugin-sdk/directory-runtime";
+import { buildPassiveProbedChannelStatusSummary } from "openclaw/plugin-sdk/extension-shared";
+import {
+  createComputedAccountStatusAdapter,
+  createDefaultChannelRuntimeState,
+} from "openclaw/plugin-sdk/status-helpers";
+import { mattermostApprovalAuth } from "./approval-auth.js";
+import {
+  compileMattermostInteractiveReplies,
+  isMattermostInteractiveRepliesEnabled,
+} from "./interactive-replies.js";
+import {
+  chunkTextForOutbound,
+  createAccountStatusSink,
+  DEFAULT_ACCOUNT_ID,
+  resolveAllowlistProviderRuntimeGroupPolicy,
+  resolveDefaultGroupPolicy,
+  type ChannelPlugin,
+} from "./channel-api.js";
+import { MattermostChannelConfigSchema } from "./config-surface.js";
+import { collectMattermostMutableAllowlistWarnings } from "./doctor.js";
+import { collectMattermostSecurityAuditFindings } from "./security-audit.js";
+import { resolveMattermostGroupRequireMention } from "./group-mentions.js";
+import {
+  listMattermostAccountIds,
+  resolveDefaultMattermostAccountId,
+  resolveMattermostAccount,
+  resolveMattermostReplyToMode,
+  type ResolvedMattermostAccount,
+} from "./mattermost/accounts.js";
+import {
+  listMattermostDirectoryGroups,
+  listMattermostDirectoryPeers,
+} from "./mattermost/directory.js";
+import { monitorMattermostProvider } from "./mattermost/monitor.js";
+import { probeMattermost } from "./mattermost/probe.js";
+import { deleteMessage, editMessage } from "./mattermost/actions.js";
+import { addMattermostReaction, removeMattermostReaction } from "./mattermost/reactions.js";
+import { sendMessageMattermost } from "./mattermost/send.js";
+import { collectMattermostSlashCallbackPaths } from "./mattermost/slash-commands.js";
+import { resolveMattermostOpaqueTarget } from "./mattermost/target-resolution.js";
+import { looksLikeMattermostTargetId, normalizeMattermostMessagingTarget } from "./normalize.js";
+import { getMattermostRuntime } from "./runtime.js";
+import { resolveMattermostOutboundSessionRoute } from "./session-route.js";
+import { mattermostSetupAdapter } from "./setup-core.js";
+import { mattermostSetupWizard } from "./setup-surface.js";
+import type { MattermostConfig } from "./types.js";
+import type { OpenClawConfig } from "./mattermost/runtime-api.js";
+
+const mattermostSecurityAdapter = createRestrictSendersChannelSecurity<ResolvedMattermostAccount>({
+  channelKey: "mattermost",
+  resolveDmPolicy: (account) => account.config.dmPolicy,
+  resolveDmAllowFrom: (account) => account.config.allowFrom,
+  resolveGroupPolicy: (account) => account.config.groupPolicy,
+  surface: "Mattermost channels",
+  openScope: "any member",
+  groupPolicyPath: "channels.mattermost.groupPolicy",
+  groupAllowFromPath: "channels.mattermost.groupAllowFrom",
+  policyPathSuffix: "dmPolicy",
+  normalizeDmEntry: (raw) => normalizeAllowEntry(raw),
+});
+
+function describeMattermostMessageTool({
+  cfg,
+  accountId,
+}: Parameters<
+  NonNullable<ChannelMessageActionAdapter["describeMessageTool"]>
+>[0]): ChannelMessageToolDiscovery {
+  const enabledAccounts = (
+    accountId
+      ? [resolveMattermostAccount({ cfg, accountId })]
+      : listMattermostAccountIds(cfg).map((listedAccountId) =>
+          resolveMattermostAccount({ cfg, accountId: listedAccountId }),
+        )
+  )
+    .filter((account) => account.enabled)
+    .filter((account) => Boolean(account.botToken?.trim() && account.baseUrl?.trim()));
+
+  const actions: ChannelMessageActionName[] = [];
+
+  if (enabledAccounts.length > 0) {
+    actions.push("send");
+  }
+
+  const actionsConfig = cfg.channels?.mattermost?.actions as
+    | { reactions?: boolean; delete?: boolean; edit?: boolean }
+    | undefined;
+  const baseReactions = actionsConfig?.reactions;
+  const hasReactionCapableAccount = enabledAccounts.some((account) => {
+    const accountActions = account.config.actions as { reactions?: boolean } | undefined;
+    return (accountActions?.reactions ?? baseReactions ?? true) !== false;
+  });
+  if (hasReactionCapableAccount) {
+    actions.push("react");
+  }
+
+  const baseDelete = actionsConfig?.delete;
+  const hasDeleteCapableAccount = enabledAccounts.some((account) => {
+    const accountActions = account.config.actions as { delete?: boolean } | undefined;
+    return (accountActions?.delete ?? baseDelete ?? true) !== false;
+  });
+  if (hasDeleteCapableAccount) {
+    actions.push("delete");
+  }
+
+  const baseEdit = actionsConfig?.edit;
+  const hasEditCapableAccount = enabledAccounts.some((account) => {
+    const accountActions = account.config.actions as { edit?: boolean } | undefined;
+    return (accountActions?.edit ?? baseEdit ?? true) !== false;
+  });
+  if (hasEditCapableAccount) {
+    actions.push("edit");
+  }
+
+  return {
+    actions,
+    capabilities: enabledAccounts.length > 0 ? ["buttons", "interactive"] : [],
+    schema:
+      enabledAccounts.length > 0
+        ? {
+            properties: {
+              buttons: Type.Optional(createMessageToolButtonsSchema()),
+            },
+          }
+        : null,
+  };
+}
+
+const mattermostMessageActions: ChannelMessageActionAdapter = {
+  describeMessageTool: describeMattermostMessageTool,
+  supportsAction: ({ action }) => {
+    return action === "send" || action === "react" || action === "delete" || action === "edit";
+  },
+  handleAction: async ({ action, params, cfg, accountId }) => {
+    if (action === "react") {
+      const resolvedAccountId = accountId ?? resolveDefaultMattermostAccountId(cfg);
+      const mattermostConfig = cfg.channels?.mattermost as MattermostConfig | undefined;
+      const account = resolveMattermostAccount({ cfg, accountId: resolvedAccountId });
+      const reactionsEnabled =
+        account.config.actions?.reactions ?? mattermostConfig?.actions?.reactions ?? true;
+      if (!reactionsEnabled) {
+        throw new Error("Mattermost reactions are disabled in config");
+      }
+
+      const { postId, emojiName, remove } = parseMattermostReactActionParams(params);
+      if (remove) {
+        const result = await removeMattermostReaction({
+          cfg,
+          postId,
+          emojiName,
+          accountId: resolvedAccountId,
+        });
+        if (!result.ok) {
+          throw new Error(result.error);
+        }
+        return {
+          content: [
+            { type: "text" as const, text: `Removed reaction :${emojiName}: from ${postId}` },
+          ],
+          details: {},
+        };
+      }
+
+      const result = await addMattermostReaction({
+        cfg,
+        postId,
+        emojiName,
+        accountId: resolvedAccountId,
+      });
+      if (!result.ok) {
+        throw new Error(result.error);
+      }
+
+      return {
+        content: [{ type: "text" as const, text: `Reacted with :${emojiName}: on ${postId}` }],
+        details: {},
+      };
+    }
+
+    if (action === "edit") {
+      const resolvedAccountId = accountId ?? resolveDefaultMattermostAccountId(cfg);
+      const mattermostConfig = cfg.channels?.mattermost as MattermostConfig | undefined;
+      const account = resolveMattermostAccount({ cfg, accountId: resolvedAccountId });
+      const editEnabled =
+        account.config.actions?.edit ?? mattermostConfig?.actions?.edit ?? true;
+      if (!editEnabled) {
+        throw new Error("Mattermost edit is disabled in config");
+      }
+
+      const postId = readTrimmedString(params.postId) ?? readTrimmedString(params.messageId);
+      if (!postId) {
+        throw new Error("Mattermost edit requires postId (messageId)");
+      }
+
+      const channelId = readTrimmedString(params.channelId);
+      if (!channelId) {
+        throw new Error("Mattermost edit requires channelId");
+      }
+
+      const message = readTrimmedString(params.message) ?? "";
+      const props =
+        typeof params.props === "object" && params.props !== null
+          ? (params.props as Record<string, unknown>)
+          : undefined;
+
+      if (!message && !props) {
+        throw new Error("Mattermost edit requires message or props");
+      }
+
+      const result = await editMessage({
+        cfg,
+        postId,
+        channelId,
+        message,
+        props,
+        accountId: resolvedAccountId,
+      });
+
+      if (!result.ok) {
+        throw new Error(result.error);
+      }
+
+      return {
+        content: [{ type: "text" as const, text: `Edited message ${postId}` }],
+        details: { postId: result.postId, channelId: result.channelId },
+      };
+    }
+
+    if (action === "delete") {
+      const resolvedAccountId = accountId ?? resolveDefaultMattermostAccountId(cfg);
+      const mattermostConfig = cfg.channels?.mattermost as MattermostConfig | undefined;
+      const account = resolveMattermostAccount({ cfg, accountId: resolvedAccountId });
+      const deleteEnabled =
+        account.config.actions?.delete ?? mattermostConfig?.actions?.delete ?? true;
+      if (!deleteEnabled) {
+        throw new Error("Mattermost delete is disabled in config");
+      }
+
+      const postId = readTrimmedString(params.postId) ?? readTrimmedString(params.messageId);
+      if (!postId) {
+        throw new Error("Mattermost delete requires postId (messageId)");
+      }
+
+      const result = await deleteMessage({
+        cfg,
+        postId,
+        accountId: resolvedAccountId,
+      });
+
+      if (!result.ok) {
+        throw new Error(result.error);
+      }
+
+      return {
+        content: [{ type: "text" as const, text: `Deleted message ${postId}` }],
+        details: {},
+      };
+    }
+
+    if (action !== "send") {
+      throw new Error(`Unsupported Mattermost action: ${action}`);
+    }
+
+    // Send action with optional interactive buttons
+    const to =
+      typeof params.to === "string"
+        ? params.to.trim()
+        : typeof params.target === "string"
+          ? params.target.trim()
+          : "";
+    if (!to) {
+      throw new Error("Mattermost send requires a target (to).");
+    }
+
+    const message = typeof params.message === "string" ? params.message : "";
+    // Match the shared runner semantics: trim empty reply IDs away before
+    // falling back from replyToId to replyTo on direct plugin calls.
+    const replyToId = readMattermostReplyToId(params);
+    const resolvedAccountId = accountId || undefined;
+
+    const mediaUrl =
+      typeof params.media === "string" ? params.media.trim() || undefined : undefined;
+
+    // Parse interactive directives from the message if interactiveReplies capability is enabled
+    const interactiveButtons = isMattermostInteractiveRepliesEnabled({
+      cfg,
+      accountId: resolvedAccountId,
+    })
+      ? parseInteractiveDirectivesToButtons(message)
+      : undefined;
+
+    // Merge parsed directives with any explicitly provided buttons
+    const mergedButtons = mergeButtons(interactiveButtons, params.buttons);
+
+    const result = await sendMessageMattermost(to, message, {
+      accountId: resolvedAccountId,
+      replyToId,
+      buttons: mergedButtons,
+      attachmentText: typeof params.attachmentText === "string" ? params.attachmentText : undefined,
+      mediaUrl,
+    });
+
+    return {
+      content: [
+        {
+          type: "text" as const,
+          text: JSON.stringify({
+            ok: true,
+            channel: "mattermost",
+            messageId: result.messageId,
+            channelId: result.channelId,
+          }),
+        },
+      ],
+      details: {},
+    };
+  },
+};
+
+const meta = {
+  id: "mattermost",
+  label: "Mattermost",
+  selectionLabel: "Mattermost (plugin)",
+  detailLabel: "Mattermost Bot",
+  docsPath: "/channels/mattermost",
+  docsLabel: "mattermost",
+  blurb: "self-hosted Slack-style chat; install the plugin to enable.",
+  systemImage: "bubble.left.and.bubble.right",
+  order: 65,
+  quickstartAllowFrom: true,
+} as const;
+
+function readTrimmedString(value: unknown): string | undefined {
+  if (typeof value !== "string") {
+    return undefined;
+  }
+  const trimmed = value.trim();
+  return trimmed || undefined;
+}
+
+function parseMattermostReactActionParams(params: Record<string, unknown>): {
+  postId: string;
+  emojiName: string;
+  remove: boolean;
+} {
+  const postId = readTrimmedString(params.messageId) ?? readTrimmedString(params.postId);
+  if (!postId) {
+    throw new Error("Mattermost react requires messageId (post id)");
+  }
+
+  const emojiName = readTrimmedString(params.emoji)?.replace(/^:+|:+$/g, "");
+  if (!emojiName) {
+    throw new Error("Mattermost react requires emoji");
+  }
+
+  return {
+    postId,
+    emojiName,
+    remove: params.remove === true,
+  };
+}
+
+function readMattermostReplyToId(params: Record<string, unknown>): string | undefined {
+  return readTrimmedString(params.replyToId) ?? readTrimmedString(params.replyTo);
+}
+
+function normalizeAllowEntry(entry: string): string {
+  return entry
+    .trim()
+    .replace(/^(mattermost|user):/i, "")
+    .replace(/^@/, "")
+    .toLowerCase();
+}
+
+/**
+ * Parse interactive directives from message text and convert to buttons array.
+ * Supports [[mattermost_buttons: ...]] and [[mattermost_select: ...]] directives.
+ */
+function parseInteractiveDirectivesToButtons(message: string): Array<Record<string, unknown>> | undefined {
+  const result = compileMattermostInteractiveReplies({ text: message });
+  const blocks = result.interactive?.blocks;
+  if (!blocks || blocks.length === 0) {
+    return undefined;
+  }
+
+  const buttons: Array<Record<string, unknown>> = [];
+
+  for (const block of blocks) {
+    if (block.type === "buttons" && Array.isArray(block.buttons)) {
+      for (const btn of block.buttons) {
+        if (typeof btn === "object" && btn !== null) {
+          buttons.push({
+            id: String((btn as { value?: string }).value ?? "").replace(/\s+/g, "_"),
+            name: String((btn as { label?: string }).label ?? ""),
+            text: String((btn as { label?: string }).label ?? ""),
+            callback_data: String((btn as { value?: string }).value ?? ""),
+            style: (btn as { style?: string }).style ?? "default",
+          });
+        }
+      }
+    }
+  }
+
+  return buttons.length > 0 ? buttons : undefined;
+}
+
+/**
+ * Merge parsed directive buttons with explicitly provided buttons.
+ * Explicit buttons take precedence over parsed directives.
+ */
+function mergeButtons(
+  parsedButtons: Array<Record<string, unknown>> | undefined,
+  explicitButtons: unknown,
+): Array<Record<string, unknown>> | undefined {
+  const explicit = Array.isArray(explicitButtons) ? explicitButtons : [];
+  const parsed = parsedButtons ?? [];
+
+  if (explicit.length === 0 && parsed.length === 0) {
+    return undefined;
+  }
+
+  // Deduplicate by callback_data/value
+  const seenValues = new Set<string>();
+  const merged: Array<Record<string, unknown>> = [];
+
+  for (const btn of [...explicit, ...parsed]) {
+    if (typeof btn !== "object" || btn === null) {
+      continue;
+    }
+    const value = String(
+      (btn as { callback_data?: string; value?: string }).callback_data ??
+        (btn as { callback_data?: string; value?: string }).value ??
+        "",
+    );
+    if (value && !seenValues.has(value)) {
+      seenValues.add(value);
+      merged.push(btn as Record<string, unknown>);
+    }
+  }
+
+  return merged.length > 0 ? merged : undefined;
+}
+
+function formatAllowEntry(entry: string): string {
+  const trimmed = entry.trim();
+  if (!trimmed) {
+    return "";
+  }
+  if (trimmed.startsWith("@")) {
+    const username = trimmed.slice(1).trim();
+    return username ? `@${username.toLowerCase()}` : "";
+  }
+  return trimmed.replace(/^(mattermost|user):/i, "").toLowerCase();
+}
+
+const mattermostConfigAdapter = createScopedChannelConfigAdapter<ResolvedMattermostAccount>({
+  sectionKey: "mattermost",
+  listAccountIds: listMattermostAccountIds,
+  resolveAccount: adaptScopedAccountAccessor(resolveMattermostAccount),
+  defaultAccountId: resolveDefaultMattermostAccountId,
+  clearBaseFields: ["botToken", "baseUrl", "name"],
+  resolveAllowFrom: (account: ResolvedMattermostAccount) => account.config.allowFrom,
+  formatAllowFrom: (allowFrom) =>
+    formatNormalizedAllowFromEntries({
+      allowFrom,
+      normalizeEntry: formatAllowEntry,
+    }),
+});
+
+export const mattermostPlugin: ChannelPlugin<ResolvedMattermostAccount> = createChatChannelPlugin({
+  base: {
+    id: "mattermost",
+    meta: {
+      ...meta,
+    },
+    setup: mattermostSetupAdapter,
+    setupWizard: mattermostSetupWizard,
+    capabilities: {
+      chatTypes: ["direct", "channel", "group", "thread"],
+      reactions: true,
+      threads: true,
+      media: true,
+      nativeCommands: true,
+    },
+    streaming: {
+      blockStreamingCoalesceDefaults: { minChars: 1500, idleMs: 1000 },
+    },
+    reload: { configPrefixes: ["channels.mattermost"] },
+    configSchema: MattermostChannelConfigSchema,
+    config: {
+      ...mattermostConfigAdapter,
+      isConfigured: (account) => Boolean(account.botToken && account.baseUrl),
+      describeAccount: (account) =>
+        describeAccountSnapshot({
+          account,
+          configured: Boolean(account.botToken && account.baseUrl),
+          extra: {
+            botTokenSource: account.botTokenSource,
+            baseUrl: account.baseUrl,
+          },
+        }),
+    },
+    auth: mattermostApprovalAuth as any,
+    doctor: {
+      collectMutableAllowlistWarnings: collectMattermostMutableAllowlistWarnings,
+    },
+    groups: {
+      resolveRequireMention: resolveMattermostGroupRequireMention,
+    },
+    actions: mattermostMessageActions,
+    directory: createChannelDirectoryAdapter({
+      listGroups: async (params) => listMattermostDirectoryGroups(params),
+      listGroupsLive: async (params) => listMattermostDirectoryGroups(params),
+      listPeers: async (params) => listMattermostDirectoryPeers(params),
+      listPeersLive: async (params) => listMattermostDirectoryPeers(params),
+    }),
+    messaging: {
+      normalizeTarget: normalizeMattermostMessagingTarget,
+      resolveOutboundSessionRoute: (params) => resolveMattermostOutboundSessionRoute(params),
+      targetResolver: {
+        looksLikeId: looksLikeMattermostTargetId,
+        hint: "<channelId|user:ID|channel:ID>",
+        resolveTarget: async ({ cfg, accountId, input }) => {
+          const resolved = await resolveMattermostOpaqueTarget({
+            input,
+            cfg,
+            accountId,
+          });
+          if (!resolved) {
+            return null;
+          }
+          return {
+            to: resolved.to,
+            kind: resolved.kind,
+            source: "directory",
+          };
+        },
+      },
+    },
+    status: createComputedAccountStatusAdapter<ResolvedMattermostAccount>({
+      defaultRuntime: createDefaultChannelRuntimeState(DEFAULT_ACCOUNT_ID, {
+        connected: false,
+        lastConnectedAt: null,
+        lastDisconnect: null,
+      }),
+      buildChannelSummary: ({ snapshot }) =>
+        buildPassiveProbedChannelStatusSummary(snapshot, {
+          botTokenSource: snapshot.botTokenSource ?? "none",
+          connected: snapshot.connected ?? false,
+          baseUrl: snapshot.baseUrl ?? null,
+        }),
+      probeAccount: async ({ account, timeoutMs }) => {
+        const token = account.botToken?.trim();
+        const baseUrl = account.baseUrl?.trim();
+        if (!token || !baseUrl) {
+          return { ok: false, error: "bot token or baseUrl missing" };
+        }
+        return await probeMattermost(
+          baseUrl,
+          token,
+          timeoutMs,
+          account.config.allowPrivateNetwork === true,
+        );
+      },
+      resolveAccountSnapshot: ({ account, runtime }) => ({
+        accountId: account.accountId,
+        name: account.name,
+        enabled: account.enabled,
+        configured: Boolean(account.botToken && account.baseUrl),
+        extra: {
+          botTokenSource: account.botTokenSource,
+          baseUrl: account.baseUrl,
+          connected: runtime?.connected ?? false,
+          lastConnectedAt: runtime?.lastConnectedAt ?? null,
+          lastDisconnect: runtime?.lastDisconnect ?? null,
+        },
+      }),
+    }),
+    gateway: {
+      resolveGatewayAuthBypassPaths: ({ cfg }) => {
+        const base = cfg.channels?.mattermost;
+        const callbackPaths = new Set(
+          collectMattermostSlashCallbackPaths(base?.commands).filter(
+            (path) =>
+              path === "/api/channels/mattermost/command" ||
+              path.startsWith("/api/channels/mattermost/"),
+          ),
+        );
+        const accounts = base?.accounts ?? {};
+        for (const account of Object.values(accounts)) {
+          const accountConfig =
+            account && typeof account === "object" && !Array.isArray(account)
+              ? (account as {
+                  commands?: Parameters<typeof collectMattermostSlashCallbackPaths>[0];
+                })
+              : undefined;
+          for (const path of collectMattermostSlashCallbackPaths(accountConfig?.commands)) {
+            if (
+              path === "/api/channels/mattermost/command" ||
+              path.startsWith("/api/channels/mattermost/")
+            ) {
+              callbackPaths.add(path);
+            }
+          }
+        }
+        return [...callbackPaths];
+      },
+      startAccount: async (ctx) => {
+        const account = ctx.account;
+        const statusSink = createAccountStatusSink({
+          accountId: ctx.accountId,
+          setStatus: ctx.setStatus,
+        });
+        statusSink({
+          baseUrl: account.baseUrl,
+          botTokenSource: account.botTokenSource,
+        });
+        ctx.log?.info(`[${account.accountId}] starting channel`);
+        return monitorMattermostProvider({
+          botToken: account.botToken ?? undefined,
+          baseUrl: account.baseUrl ?? undefined,
+          accountId: account.accountId,
+          config: ctx.cfg,
+          runtime: ctx.runtime,
+          abortSignal: ctx.abortSignal,
+          statusSink,
+        });
+      },
+    },
+  },
+  pairing: {
+    text: {
+      idLabel: "mattermostUserId",
+      message: "OpenClaw: your access has been approved.",
+      normalizeAllowEntry: (entry) => normalizeAllowEntry(entry),
+      notify: createLoggedPairingApprovalNotifier(
+        ({ id }) => `[mattermost] User ${id} approved for pairing`,
+      ),
+    },
+  },
+  threading: {
+    scopedAccountReplyToMode: {
+      resolveAccount: (cfg, accountId) =>
+        resolveMattermostAccount({
+          cfg,
+          accountId: accountId ?? resolveDefaultMattermostAccountId(cfg),
+        }),
+      resolveReplyToMode: (account, chatType) =>
+        resolveMattermostReplyToMode(
+          account,
+          chatType === "direct" || chatType === "group" || chatType === "channel"
+            ? chatType
+            : "channel",
+        ),
+    },
+  },
+  security: {
+    ...mattermostSecurityAdapter,
+    collectAuditFindings: async (params) => {
+      const account = params.account;
+      return await collectMattermostSecurityAuditFindings({
+        cfg: params.sourceConfig,
+        accountId: account?.accountId,
+        account,
+      });
+    },
+  },
+  outbound: {
+    base: {
+      deliveryMode: "direct",
+      chunker: chunkTextForOutbound,
+      chunkerMode: "markdown",
+      textChunkLimit: 4000,
+      resolveTarget: ({ to }) => {
+        const trimmed = to?.trim();
+        if (!trimmed) {
+          return {
+            ok: false,
+            error: new Error(
+              "Delivering to Mattermost requires --to <channelId|@username|user:ID|channel:ID>",
+            ),
+          };
+        }
+        return { ok: true, to: trimmed };
+      },
+    },
+    attachedResults: {
+      channel: "mattermost",
+      sendText: async ({ cfg, to, text, accountId, replyToId, threadId }) =>
+        await sendMessageMattermost(to, text, {
+          cfg,
+          accountId: accountId ?? undefined,
+          replyToId: replyToId ?? (threadId != null ? String(threadId) : undefined),
+        }),
+      sendMedia: async ({
+        cfg,
+        to,
+        text,
+        mediaUrl,
+        mediaLocalRoots,
+        accountId,
+        replyToId,
+        threadId,
+      }) =>
+        await sendMessageMattermost(to, text, {
+          cfg,
+          accountId: accountId ?? undefined,
+          mediaUrl,
+          mediaLocalRoots,
+          replyToId: replyToId ?? (threadId != null ? String(threadId) : undefined),
+        }),
+    },
+  },
+});

extensions/mattermost/src/config-runtime.ts

@@ -0,0 +1,7 @@
+export {
+  BlockStreamingCoalesceSchema,
+  DmPolicySchema,
+  GroupPolicySchema,
+  MarkdownConfigSchema,
+  requireOpenAllowFrom,
+} from "openclaw/plugin-sdk/channel-config-schema";

extensions/mattermost/src/config-schema-core.ts

@@ -0,0 +1,134 @@
+import {
+  BlockStreamingCoalesceSchema,
+  DmPolicySchema,
+  GroupPolicySchema,
+  MarkdownConfigSchema,
+  requireOpenAllowFrom,
+} from "openclaw/plugin-sdk/channel-config-primitives";
+import { z } from "openclaw/plugin-sdk/zod";
+import { buildSecretInputSchema } from "./secret-input.js";
+
+const MattermostGroupSchema = z
+  .object({
+    /** Whether mentions are required to trigger the bot in this group. */
+    requireMention: z.boolean().optional(),
+  })
+  .strict();
+
+function requireMattermostOpenAllowFrom(params: {
+  policy?: string;
+  allowFrom?: Array<string | number>;
+  ctx: z.RefinementCtx;
+}) {
+  requireOpenAllowFrom({
+    policy: params.policy,
+    allowFrom: params.allowFrom,
+    ctx: params.ctx,
+    path: ["allowFrom"],
+    message:
+      'channels.mattermost.dmPolicy="open" requires channels.mattermost.allowFrom to include "*"',
+  });
+}
+
+const DmChannelRetrySchema = z
+  .object({
+    /** Maximum number of retry attempts for DM channel creation (default: 3) */
+    maxRetries: z.number().int().min(0).max(10).optional(),
+    /** Initial delay in milliseconds before first retry (default: 1000) */
+    initialDelayMs: z.number().int().min(100).max(60000).optional(),
+    /** Maximum delay in milliseconds between retries (default: 10000) */
+    maxDelayMs: z.number().int().min(1000).max(60000).optional(),
+    /** Timeout for each individual DM channel creation request in milliseconds (default: 30000) */
+    timeoutMs: z.number().int().min(5000).max(120000).optional(),
+  })
+  .strict()
+  .refine(
+    (data) => {
+      if (data.initialDelayMs !== undefined && data.maxDelayMs !== undefined) {
+        return data.initialDelayMs <= data.maxDelayMs;
+      }
+      return true;
+    },
+    {
+      message: "initialDelayMs must be less than or equal to maxDelayMs",
+      path: ["initialDelayMs"],
+    },
+  )
+  .optional();
+
+const MattermostSlashCommandsSchema = z
+  .object({
+    /** Enable native slash commands. "auto" resolves to false (opt-in). */
+    native: z.union([z.boolean(), z.literal("auto")]).optional(),
+    /** Also register skill-based commands. */
+    nativeSkills: z.union([z.boolean(), z.literal("auto")]).optional(),
+    /** Path for the callback endpoint on the gateway HTTP server. */
+    callbackPath: z.string().optional(),
+    /** Explicit callback URL (e.g. behind reverse proxy). */
+    callbackUrl: z.string().optional(),
+  })
+  .strict()
+  .optional();
+
+const MattermostAccountSchemaBase = z
+  .object({
+    name: z.string().optional(),
+    capabilities: z.array(z.string()).optional(),
+    dangerouslyAllowNameMatching: z.boolean().optional(),
+    markdown: MarkdownConfigSchema,
+    enabled: z.boolean().optional(),
+    configWrites: z.boolean().optional(),
+    botToken: buildSecretInputSchema().optional(),
+    baseUrl: z.string().optional(),
+    chatmode: z.enum(["oncall", "onmessage", "onchar"]).optional(),
+    oncharPrefixes: z.array(z.string()).optional(),
+    requireMention: z.boolean().optional(),
+    dmPolicy: DmPolicySchema.optional().default("pairing"),
+    allowFrom: z.array(z.union([z.string(), z.number()])).optional(),
+    groupAllowFrom: z.array(z.union([z.string(), z.number()])).optional(),
+    groupPolicy: GroupPolicySchema.optional().default("allowlist"),
+    textChunkLimit: z.number().int().positive().optional(),
+    chunkMode: z.enum(["length", "newline"]).optional(),
+    blockStreaming: z.boolean().optional(),
+    blockStreamingCoalesce: BlockStreamingCoalesceSchema.optional(),
+    replyToMode: z.enum(["off", "first", "all"]).optional(),
+    responsePrefix: z.string().optional(),
+    actions: z
+      .object({
+        reactions: z.boolean().optional(),
+      })
+      .optional(),
+    commands: MattermostSlashCommandsSchema,
+    interactions: z
+      .object({
+        callbackBaseUrl: z.string().optional(),
+        allowedSourceIps: z.array(z.string()).optional(),
+      })
+      .optional(),
+    /** Per-group configuration (keyed by Mattermost channel ID or "*" for default). */
+    groups: z.record(z.string(), MattermostGroupSchema.optional()).optional(),
+    /** Allow fetching from private/internal IP addresses (e.g. localhost). Required for self-hosted Mattermost on LAN/VPN. */
+    allowPrivateNetwork: z.boolean().optional(),
+    /** Retry configuration for DM channel creation */
+    dmChannelRetry: DmChannelRetrySchema,
+  })
+  .strict();
+
+const MattermostAccountSchema = MattermostAccountSchemaBase.superRefine((value, ctx) => {
+  requireMattermostOpenAllowFrom({
+    policy: value.dmPolicy,
+    allowFrom: value.allowFrom,
+    ctx,
+  });
+});
+
+export const MattermostConfigSchema = MattermostAccountSchemaBase.extend({
+  accounts: z.record(z.string(), MattermostAccountSchema.optional()).optional(),
+  defaultAccount: z.string().optional(),
+}).superRefine((value, ctx) => {
+  requireMattermostOpenAllowFrom({
+    policy: value.dmPolicy,
+    allowFrom: value.allowFrom,
+    ctx,
+  });
+});

extensions/mattermost/src/config-schema.test.ts

@@ -0,0 +1,82 @@
+import { describe, expect, it } from "vitest";
+import { MattermostConfigSchema } from "./config-schema.js";
+
+describe("MattermostConfigSchema", () => {
+  it("accepts SecretRef botToken at top-level", () => {
+    const result = MattermostConfigSchema.safeParse({
+      botToken: { source: "env", provider: "default", id: "MATTERMOST_BOT_TOKEN" },
+      baseUrl: "https://chat.example.com",
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("accepts SecretRef botToken on account", () => {
+    const result = MattermostConfigSchema.safeParse({
+      accounts: {
+        main: {
+          botToken: { source: "env", provider: "default", id: "MATTERMOST_BOT_TOKEN_MAIN" },
+          baseUrl: "https://chat.example.com",
+        },
+      },
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("accepts replyToMode", () => {
+    const result = MattermostConfigSchema.safeParse({
+      replyToMode: "all",
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("accepts groups with requireMention", () => {
+    const result = MattermostConfigSchema.safeParse({
+      groups: {
+        "*": { requireMention: true },
+        "channel-123": { requireMention: false },
+      },
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("accepts groups on account", () => {
+    const result = MattermostConfigSchema.safeParse({
+      accounts: {
+        main: {
+          baseUrl: "https://chat.example.com",
+          groups: {
+            "*": { requireMention: true },
+          },
+        },
+      },
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("rejects unknown properties inside groups entry", () => {
+    const result = MattermostConfigSchema.safeParse({
+      groups: {
+        "*": { requireMention: true, unknownProp: "bad" },
+      },
+    });
+    expect(result.success).toBe(false);
+  });
+
+  it("rejects unsupported direct-message reply threading config", () => {
+    const result = MattermostConfigSchema.safeParse({
+      dm: {
+        replyToMode: "all",
+      },
+    });
+    expect(result.success).toBe(false);
+  });
+
+  it("rejects unsupported per-chat-type reply threading config", () => {
+    const result = MattermostConfigSchema.safeParse({
+      replyToModeByChatType: {
+        direct: "all",
+      },
+    });
+    expect(result.success).toBe(false);
+  });
+});

extensions/mattermost/src/config-schema.ts

@@ -0,0 +1,135 @@
+import { z } from "openclaw/plugin-sdk/zod";
+import {
+  BlockStreamingCoalesceSchema,
+  DmPolicySchema,
+  GroupPolicySchema,
+  MarkdownConfigSchema,
+  requireOpenAllowFrom,
+} from "./config-runtime.js";
+import { buildSecretInputSchema } from "./secret-input.js";
+
+const MattermostGroupSchema = z
+  .object({
+    /** Whether mentions are required to trigger the bot in this group. */
+    requireMention: z.boolean().optional(),
+  })
+  .strict();
+
+function requireMattermostOpenAllowFrom(params: {
+  policy?: string;
+  allowFrom?: Array<string | number>;
+  ctx: z.RefinementCtx;
+}) {
+  requireOpenAllowFrom({
+    policy: params.policy,
+    allowFrom: params.allowFrom,
+    ctx: params.ctx,
+    path: ["allowFrom"],
+    message:
+      'channels.mattermost.dmPolicy="open" requires channels.mattermost.allowFrom to include "*"',
+  });
+}
+
+const DmChannelRetrySchema = z
+  .object({
+    /** Maximum number of retry attempts for DM channel creation (default: 3) */
+    maxRetries: z.number().int().min(0).max(10).optional(),
+    /** Initial delay in milliseconds before first retry (default: 1000) */
+    initialDelayMs: z.number().int().min(100).max(60000).optional(),
+    /** Maximum delay in milliseconds between retries (default: 10000) */
+    maxDelayMs: z.number().int().min(1000).max(60000).optional(),
+    /** Timeout for each individual DM channel creation request in milliseconds (default: 30000) */
+    timeoutMs: z.number().int().min(5000).max(120000).optional(),
+  })
+  .strict()
+  .refine(
+    (data) => {
+      if (data.initialDelayMs !== undefined && data.maxDelayMs !== undefined) {
+        return data.initialDelayMs <= data.maxDelayMs;
+      }
+      return true;
+    },
+    {
+      message: "initialDelayMs must be less than or equal to maxDelayMs",
+      path: ["initialDelayMs"],
+    },
+  )
+  .optional();
+
+const MattermostSlashCommandsSchema = z
+  .object({
+    /** Enable native slash commands. "auto" resolves to false (opt-in). */
+    native: z.union([z.boolean(), z.literal("auto")]).optional(),
+    /** Also register skill-based commands. */
+    nativeSkills: z.union([z.boolean(), z.literal("auto")]).optional(),
+    /** Path for the callback endpoint on the gateway HTTP server. */
+    callbackPath: z.string().optional(),
+    /** Explicit callback URL (e.g. behind reverse proxy). */
+    callbackUrl: z.string().optional(),
+  })
+  .strict()
+  .optional();
+
+const MattermostAccountSchemaBase = z
+  .object({
+    name: z.string().optional(),
+    capabilities: z.array(z.string()).optional(),
+    dangerouslyAllowNameMatching: z.boolean().optional(),
+    markdown: MarkdownConfigSchema,
+    enabled: z.boolean().optional(),
+    configWrites: z.boolean().optional(),
+    botToken: buildSecretInputSchema().optional(),
+    pat: buildSecretInputSchema().optional(),
+    baseUrl: z.string().optional(),
+    chatmode: z.enum(["oncall", "onmessage", "onchar"]).optional(),
+    oncharPrefixes: z.array(z.string()).optional(),
+    requireMention: z.boolean().optional(),
+    dmPolicy: DmPolicySchema.optional().default("pairing"),
+    allowFrom: z.array(z.union([z.string(), z.number()])).optional(),
+    groupAllowFrom: z.array(z.union([z.string(), z.number()])).optional(),
+    groupPolicy: GroupPolicySchema.optional().default("allowlist"),
+    textChunkLimit: z.number().int().positive().optional(),
+    chunkMode: z.enum(["length", "newline"]).optional(),
+    blockStreaming: z.boolean().optional(),
+    blockStreamingCoalesce: BlockStreamingCoalesceSchema.optional(),
+    replyToMode: z.enum(["off", "first", "all"]).optional(),
+    responsePrefix: z.string().optional(),
+    actions: z
+      .object({
+        reactions: z.boolean().optional(),
+      })
+      .optional(),
+    commands: MattermostSlashCommandsSchema,
+    interactions: z
+      .object({
+        callbackBaseUrl: z.string().optional(),
+        allowedSourceIps: z.array(z.string()).optional(),
+      })
+      .optional(),
+    /** Per-group configuration (keyed by Mattermost channel ID or "*" for default). */
+    groups: z.record(z.string(), MattermostGroupSchema.optional()).optional(),
+    /** Allow fetching from private/internal IP addresses (e.g. localhost). Required for self-hosted Mattermost on LAN/VPN. */
+    allowPrivateNetwork: z.boolean().optional(),
+    /** Retry configuration for DM channel creation */
+    dmChannelRetry: DmChannelRetrySchema,
+  })
+  .strict();
+
+const MattermostAccountSchema = MattermostAccountSchemaBase.superRefine((value, ctx) => {
+  requireMattermostOpenAllowFrom({
+    policy: value.dmPolicy,
+    allowFrom: value.allowFrom,
+    ctx,
+  });
+});
+
+export const MattermostConfigSchema = MattermostAccountSchemaBase.extend({
+  accounts: z.record(z.string(), MattermostAccountSchema.optional()).optional(),
+  defaultAccount: z.string().optional(),
+}).superRefine((value, ctx) => {
+  requireMattermostOpenAllowFrom({
+    policy: value.dmPolicy,
+    allowFrom: value.allowFrom,
+    ctx,
+  });
+});

extensions/mattermost/src/config-surface.ts

@@ -0,0 +1,5 @@
+import type { ChannelConfigSchema } from "openclaw/plugin-sdk";
+import { buildChannelConfigSchema } from "openclaw/plugin-sdk/channel-config-primitives";
+import { MattermostConfigSchema } from "./config-schema-core.js";
+
+export const MattermostChannelConfigSchema: ChannelConfigSchema = buildChannelConfigSchema(MattermostConfigSchema);

extensions/mattermost/src/doctor.ts

@@ -0,0 +1,322 @@
+import { createDangerousNameMatchingMutableAllowlistWarningCollector } from "openclaw/plugin-sdk/channel-policy";
+import {
+  type ChannelDoctorAdapter,
+  type ChannelDoctorConfigMutation,
+  type ChannelDoctorLegacyConfigRule,
+} from "openclaw/plugin-sdk/channel-contract";
+import { type OpenClawConfig } from "openclaw/plugin-sdk/config-runtime";
+import { collectProviderDangerousNameMatchingScopes } from "openclaw/plugin-sdk/runtime";
+import { isMattermostMutableAllowEntry } from "./security-audit.js";
+
+/**
+ * Check if an allowlist entry is mutable (uses name/username instead of stable ID).
+ * Mattermost IDs are 26-character alphanumeric strings.
+ */
+function isMattermostMutableAllowEntryLocal(raw: string): boolean {
+  const text = raw.trim();
+  if (!text || text === "*") {
+    return false;
+  }
+
+  const normalized = text
+    .replace(/^(mattermost|user):/i, "")
+    .replace(/^@/, "")
+    .trim()
+    .toLowerCase();
+
+  // Mattermost IDs are exactly 26 alphanumeric characters
+  if (/^[a-z0-9]{26}$/.test(normalized)) {
+    return false;
+  }
+
+  return true;
+}
+
+/**
+ * Collect warnings for mutable allowlist entries that should be migrated to stable IDs.
+ */
+export const collectMattermostMutableAllowlistWarnings =
+  createDangerousNameMatchingMutableAllowlistWarningCollector({
+    channel: "mattermost",
+    detector: isMattermostMutableAllowEntryLocal,
+    collectLists: (scope) => [
+      {
+        pathLabel: `${scope.prefix}.allowFrom`,
+        list: scope.account.allowFrom,
+      },
+      {
+        pathLabel: `${scope.prefix}.groupAllowFrom`,
+        list: scope.account.groupAllowFrom,
+      },
+    ],
+  });
+
+/**
+ * Type guard for object records.
+ */
+function asObjectRecord(value: unknown): Record<string, unknown> | null {
+  return value && typeof value === "object" && !Array.isArray(value)
+    ? (value as Record<string, unknown>)
+    : null;
+}
+
+/**
+ * Check if two allowFrom lists are equal.
+ */
+function allowFromEqual(a: unknown, b: unknown): boolean {
+  if (!Array.isArray(a) || !Array.isArray(b)) {
+    return false;
+  }
+  const na = a.map((v) => String(v).trim()).filter(Boolean);
+  const nb = b.map((v) => String(v).trim()).filter(Boolean);
+  if (na.length !== nb.length) {
+    return false;
+  }
+  return na.every((v, i) => v === nb[i]);
+}
+
+/**
+ * Normalize Mattermost DM aliases for legacy configuration migration.
+ * Handles migration of dm.policy -> dmPolicy and dm.allowFrom -> allowFrom.
+ */
+function normalizeMattermostDmAliases(params: {
+  entry: Record<string, unknown>;
+  pathPrefix: string;
+  changes: string[];
+}): { entry: Record<string, unknown>; changed: boolean } {
+  let changed = false;
+  let updated: Record<string, unknown> = params.entry;
+  const rawDm = updated.dm;
+  const dm = asObjectRecord(rawDm) ? (structuredClone(rawDm) as Record<string, unknown>) : null;
+  let dmChanged = false;
+
+  const topDmPolicy = updated.dmPolicy;
+  const legacyDmPolicy = dm?.policy;
+  if (topDmPolicy === undefined && legacyDmPolicy !== undefined) {
+    updated = { ...updated, dmPolicy: legacyDmPolicy };
+    changed = true;
+    if (dm) {
+      delete dm.policy;
+      dmChanged = true;
+    }
+    params.changes.push(`Moved ${params.pathPrefix}.dm.policy → ${params.pathPrefix}.dmPolicy.`);
+  } else if (
+    topDmPolicy !== undefined &&
+    legacyDmPolicy !== undefined &&
+    topDmPolicy === legacyDmPolicy
+  ) {
+    if (dm) {
+      delete dm.policy;
+      dmChanged = true;
+      params.changes.push(`Removed ${params.pathPrefix}.dm.policy (dmPolicy already set).`);
+    }
+  }
+
+  const topAllowFrom = updated.allowFrom;
+  const legacyAllowFrom = dm?.allowFrom;
+  if (topAllowFrom === undefined && legacyAllowFrom !== undefined) {
+    updated = { ...updated, allowFrom: legacyAllowFrom };
+    changed = true;
+    if (dm) {
+      delete dm.allowFrom;
+      dmChanged = true;
+    }
+    params.changes.push(
+      `Moved ${params.pathPrefix}.dm.allowFrom → ${params.pathPrefix}.allowFrom.`,
+    );
+  } else if (
+    topAllowFrom !== undefined &&
+    legacyAllowFrom !== undefined &&
+    allowFromEqual(topAllowFrom, legacyAllowFrom)
+  ) {
+    if (dm) {
+      delete dm.allowFrom;
+      dmChanged = true;
+      params.changes.push(`Removed ${params.pathPrefix}.dm.allowFrom (allowFrom already set).`);
+    }
+  }
+
+  if (dm && asObjectRecord(rawDm) && dmChanged) {
+    const keys = Object.keys(dm);
+    if (keys.length === 0) {
+      if (updated.dm !== undefined) {
+        const { dm: _ignored, ...rest } = updated;
+        updated = rest;
+        changed = true;
+        params.changes.push(`Removed empty ${params.pathPrefix}.dm after migration.`);
+      }
+    } else {
+      updated = { ...updated, dm };
+      changed = true;
+    }
+  }
+
+  return { entry: updated, changed };
+}
+
+/**
+ * Check if a Mattermost config entry has legacy streaming aliases.
+ */
+function hasLegacyMattermostStreamingAliases(value: unknown): boolean {
+  const entry = asObjectRecord(value);
+  if (!entry) {
+    return false;
+  }
+  return false;
+}
+
+function hasLegacyMattermostAccountStreamingAliases(value: unknown): boolean {
+  const accounts = asObjectRecord(value);
+  if (!accounts) {
+    return false;
+  }
+  return Object.values(accounts).some((account) => hasLegacyMattermostStreamingAliases(account));
+}
+
+/**
+ * Legacy configuration rules for Mattermost.
+ */
+const MATTERMOST_LEGACY_CONFIG_RULES: ChannelDoctorLegacyConfigRule[] = [
+  {
+    path: ["channels", "mattermost"],
+    message:
+      "channels.mattermost.dm.policy and channels.mattermost.dm.allowFrom are legacy; use channels.mattermost.dmPolicy and channels.mattermost.allowForm.",
+    match: (value) => {
+      const entry = asObjectRecord(value);
+      if (!entry) return false;
+      const dm = asObjectRecord(entry.dm);
+      return dm?.policy !== undefined || dm?.allowFrom !== undefined;
+    },
+  },
+  {
+    path: ["channels", "mattermost", "accounts"],
+    message:
+      "channels.mattermost.accounts.<id>.dm.policy and .dm.allowFrom are legacy; use channels.mattermost.accounts.<id>.dmPolicy and .allowFrom.",
+    match: hasLegacyMattermostAccountStreamingAliases,
+  },
+];
+
+/**
+ * Normalize Mattermost compatibility configuration.
+ * Handles migrations from legacy dm.* structure to flat structure.
+ */
+function normalizeMattermostCompatibilityConfig(cfg: OpenClawConfig): ChannelDoctorConfigMutation {
+  const rawEntry = asObjectRecord((cfg.channels as Record<string, unknown> | undefined)?.mattermost);
+  if (!rawEntry) {
+    return { config: cfg, changes: [] };
+  }
+
+  const changes: string[] = [];
+  let updated = rawEntry;
+  let changed = false;
+
+  const base = normalizeMattermostDmAliases({
+    entry: rawEntry,
+    pathPrefix: "channels.mattermost",
+    changes,
+  });
+  updated = base.entry;
+  changed = base.changed;
+
+  const rawAccounts = asObjectRecord(updated.accounts);
+  if (rawAccounts) {
+    let accountsChanged = false;
+    const accounts = { ...rawAccounts };
+    for (const [accountId, rawAccount] of Object.entries(rawAccounts)) {
+      const account = asObjectRecord(rawAccount);
+      if (!account) {
+        continue;
+      }
+      const dm = normalizeMattermostDmAliases({
+        entry: account,
+        pathPrefix: `channels.mattermost.accounts.${accountId}`,
+        changes,
+      });
+      if (dm.changed) {
+        accounts[accountId] = dm.entry;
+        accountsChanged = true;
+      }
+    }
+    if (accountsChanged) {
+      updated = { ...updated, accounts };
+      changed = true;
+    }
+  }
+
+  if (!changed) {
+    return { config: cfg, changes: [] };
+  }
+
+  return {
+    config: {
+      ...cfg,
+      channels: {
+        ...cfg.channels,
+        mattermost: updated as unknown as NonNullable<OpenClawConfig["channels"]>["mattermost"],
+      } as OpenClawConfig["channels"],
+    },
+    changes,
+  };
+}
+
+/**
+ * Collect warnings for deprecated or insecure configurations.
+ */
+function collectMattermostDeprecatedConfigWarnings(cfg: OpenClawConfig): string[] {
+  const warnings: string[] = [];
+  const mmCfg = (cfg.channels as Record<string, unknown> | undefined)?.mattermost;
+  const entry = asObjectRecord(mmCfg);
+  if (!entry) return warnings;
+
+  const baseUrl = entry.baseUrl;
+  if (typeof baseUrl === "string" && baseUrl.startsWith("http://")) {
+    warnings.push(
+      `- Insecure HTTP URL detected: channels.mattermost.baseUrl uses http://. Use https:// for secure communication.`,
+    );
+  }
+
+  const accounts = asObjectRecord(entry.accounts);
+  if (accounts) {
+    for (const [accountId, rawAccount] of Object.entries(accounts)) {
+      const account = asObjectRecord(rawAccount);
+      if (account && typeof account.baseUrl === "string" && account.baseUrl.startsWith("http://")) {
+        warnings.push(
+          `- Insecure HTTP URL detected: channels.mattermost.accounts.${accountId}.baseUrl uses http://. Use https:// for secure communication.`,
+        );
+      }
+    }
+  }
+
+  const dmPolicy = entry.dmPolicy;
+  const allowFrom = entry.allowFrom;
+  if (dmPolicy === "open" && (!allowFrom || (Array.isArray(allowFrom) && allowFrom.length === 0))) {
+    warnings.push(
+      `- Open DM policy configured without an allowlist. Any Mattermost user can send DMs to the bot. Consider using dmPolicy='pairing' or 'allowlist' for better security.`,
+    );
+  }
+
+  return warnings;
+}
+
+/**
+ * Mattermost doctor adapter providing:
+ * - Legacy config migration detection
+ * - Mutable allowlist warnings
+ * - Security configuration checks
+ * - Compatibility normalization
+ */
+export const mattermostDoctor: ChannelDoctorAdapter = {
+  dmAllowFromMode: "topOrNested",
+  groupModel: "route",
+  groupAllowFromFallbackToAllowFrom: false,
+  warnOnEmptyGroupSenderAllowlist: false,
+  legacyConfigRules: MATTERMOST_LEGACY_CONFIG_RULES,
+  normalizeCompatibilityConfig: ({ cfg }) => normalizeMattermostCompatibilityConfig(cfg),
+  collectMutableAllowlistWarnings: ({ cfg }) => collectMattermostMutableAllowlistWarnings({ cfg }),
+  collectPreviewWarnings: ({ cfg }) => collectMattermostDeprecatedConfigWarnings(cfg),
+};
+
+/**
+ * @deprecated Use mattermostDoctor instead. Kept for backward compatibility.
+ */
+export { isMattermostMutableAllowEntry };

extensions/mattermost/src/errors.test.ts

@@ -0,0 +1,448 @@
+import { describe, expect, it } from "vitest";
+import {
+  ErrorCodes,
+  MattermostError,
+  MattermostAPIError,
+  AuthenticationError,
+  ValidationError,
+  PermissionError,
+  RateLimitError,
+  ResourceNotFoundError,
+  NetworkError,
+  TimeoutError,
+  ConfigurationError,
+  MissingBotTokenError,
+  MissingBaseUrlError,
+  isRetryableError,
+  getRetryAfterMs,
+  withRetry,
+  ErrorBoundary,
+  getUserFriendlyMessage,
+  createErrorFromResponse,
+} from "./errors.js";
+
+describe("Error Handling", () => {
+  describe("ErrorCodes", () => {
+    it("has all expected error codes", () => {
+      expect(ErrorCodes.MATTERMOST_API_ERROR).toBe("MATTERMOST_API_ERROR");
+      expect(ErrorCodes.AUTHENTICATION_FAILED).toBe("AUTHENTICATION_FAILED");
+      expect(ErrorCodes.VALIDATION_ERROR).toBe("VALIDATION_ERROR");
+      expect(ErrorCodes.PERMISSION_DENIED).toBe("PERMISSION_DENIED");
+      expect(ErrorCodes.RATE_LIMIT_EXCEEDED).toBe("RATE_LIMIT_EXCEEDED");
+      expect(ErrorCodes.NETWORK_ERROR).toBe("NETWORK_ERROR");
+      expect(ErrorCodes.TIMEOUT_ERROR).toBe("TIMEOUT_ERROR");
+      expect(ErrorCodes.RESOURCE_NOT_FOUND).toBe("RESOURCE_NOT_FOUND");
+      expect(ErrorCodes.CONFIGURATION_ERROR).toBe("CONFIGURATION_ERROR");
+      expect(ErrorCodes.MISSING_BOT_TOKEN).toBe("MISSING_BOT_TOKEN");
+      expect(ErrorCodes.MISSING_BASE_URL).toBe("MISSING_BASE_URL");
+      expect(ErrorCodes.UNKNOWN_ERROR).toBe("UNKNOWN_ERROR");
+    });
+  });
+
+  describe("MattermostError", () => {
+    it("creates a basic error with context", () => {
+      const error = new MattermostError({
+        code: ErrorCodes.UNKNOWN_ERROR,
+        message: "Test error",
+        context: {
+          operation: "test-operation",
+          timestamp: new Date().toISOString(),
+        },
+      });
+
+      expect(error.code).toBe(ErrorCodes.UNKNOWN_ERROR);
+      expect(error.message).toBe("Test error");
+      expect(error.context.operation).toBe("test-operation");
+      expect(error.retryable).toBe(false);
+    });
+
+    it("serializes to JSON safely", () => {
+      const error = new MattermostError({
+        code: ErrorCodes.MATTERMOST_API_ERROR,
+        message: "API error",
+        context: {
+          operation: "api-call",
+          accountId: "test-account",
+          statusCode: 500,
+          timestamp: new Date().toISOString(),
+        },
+        retryable: true,
+      });
+
+      const json = error.toJSON();
+      expect(json.code).toBe(ErrorCodes.MATTERMOST_API_ERROR);
+      expect(json.retryable).toBe(true);
+      expect(json.context.accountId).toBe("test-account");
+      expect(json.context.statusCode).toBe(500);
+    });
+
+    it("formats log string correctly", () => {
+      const timestamp = new Date().toISOString();
+      const error = new MattermostError({
+        code: ErrorCodes.NETWORK_ERROR,
+        message: "Connection failed",
+        context: {
+          operation: "network-request",
+          timestamp,
+        },
+      });
+
+      const logString = error.toLogString();
+      expect(logString).toContain(ErrorCodes.NETWORK_ERROR);
+      expect(logString).toContain("Connection failed");
+      expect(logString).toContain("network-request");
+    });
+  });
+
+  describe("MattermostAPIError", () => {
+    it("marks 5xx errors as retryable", () => {
+      const error = new MattermostAPIError(
+        "Server error",
+        { operation: "test", timestamp: new Date().toISOString() },
+        503
+      );
+      expect(error.retryable).toBe(true);
+      expect(error.code).toBe(ErrorCodes.MATTERMOST_API_SERVER_ERROR);
+    });
+
+    it("marks 429 errors as retryable", () => {
+      const error = new MattermostAPIError(
+        "Rate limited",
+        { operation: "test", timestamp: new Date().toISOString() },
+        429
+      );
+      expect(error.retryable).toBe(true);
+      expect(error.code).toBe(ErrorCodes.MATTERMOST_API_RATE_LIMIT);
+    });
+
+    it("marks 4xx errors (except 429) as not retryable", () => {
+      const error = new MattermostAPIError(
+        "Bad request",
+        { operation: "test", timestamp: new Date().toISOString() },
+        400
+      );
+      expect(error.retryable).toBe(false);
+    });
+
+    it("provides user-friendly messages for common status codes", () => {
+      const error401 = new MattermostAPIError(
+        "Auth failed",
+        { operation: "test", timestamp: new Date().toISOString() },
+        401
+      );
+      expect(error401.userMessage).toContain("bot token");
+
+      const error429 = new MattermostAPIError(
+        "Rate limited",
+        { operation: "test", timestamp: new Date().toISOString() },
+        429
+      );
+      expect(error429.userMessage).toContain("Rate limit");
+    });
+  });
+
+  describe("AuthenticationError", () => {
+    it("is not retryable", () => {
+      const error = new AuthenticationError(
+        "Auth failed",
+        { operation: "test", timestamp: new Date().toISOString() }
+      );
+      expect(error.retryable).toBe(false);
+      expect(error.code).toBe(ErrorCodes.AUTHENTICATION_FAILED);
+    });
+
+    it("has user-friendly message", () => {
+      const error = new AuthenticationError(
+        "Auth failed",
+        { operation: "test", timestamp: new Date().toISOString() }
+      );
+      expect(error.userMessage).toContain("Authentication failed");
+      expect(error.userMessage).toContain("bot token");
+    });
+  });
+
+  describe("ConfigurationError", () => {
+    it("MissingBaseUrlError has correct message", () => {
+      const error = new MissingBaseUrlError({
+        operation: "create-client",
+        timestamp: new Date().toISOString(),
+      });
+      expect(error.message).toContain("baseUrl is required");
+      expect(error.code).toBe(ErrorCodes.MISSING_BASE_URL);
+    });
+
+    it("MissingBotTokenError has correct message", () => {
+      const error = new MissingBotTokenError({
+        operation: "create-client",
+        timestamp: new Date().toISOString(),
+      });
+      expect(error.message).toContain("bot token is required");
+      expect(error.code).toBe(ErrorCodes.MISSING_BOT_TOKEN);
+    });
+  });
+
+  describe("isRetryableError", () => {
+    it("returns true for MattermostError with retryable=true", () => {
+      const error = new MattermostAPIError(
+        "Server error",
+        { operation: "test", timestamp: new Date().toISOString() },
+        503
+      );
+      expect(isRetryableError(error)).toBe(true);
+    });
+
+    it("returns false for MattermostError with retryable=false", () => {
+      const error = new AuthenticationError(
+        "Auth failed",
+        { operation: "test", timestamp: new Date().toISOString() }
+      );
+      expect(isRetryableError(error)).toBe(false);
+    });
+
+    it("returns true for network error codes", () => {
+      const error = { code: "ECONNRESET" };
+      expect(isRetryableError(error)).toBe(true);
+    });
+
+    it("returns true for timeout errors", () => {
+      const error = { message: "Request timeout" };
+      expect(isRetryableError(error)).toBe(true);
+    });
+  });
+
+  describe("getRetryAfterMs", () => {
+    it("extracts retry-after from RateLimitError", () => {
+      const error = new RateLimitError(
+        "Rate limited",
+        { operation: "test", timestamp: new Date().toISOString() },
+        5000
+      );
+      expect(getRetryAfterMs(error)).toBe(5000);
+    });
+
+    it("extracts retry-after from headers", () => {
+      const error = {
+        headers: {
+          get: (name: string) => (name === "retry-after" ? "10" : null),
+        },
+      };
+      expect(getRetryAfterMs(error)).toBe(10000);
+    });
+
+    it("returns undefined when no retry-after available", () => {
+      expect(getRetryAfterMs(new Error("Some error"))).toBeUndefined();
+    });
+  });
+
+  describe("withRetry", () => {
+    it("succeeds on first attempt", async () => {
+      const fn = () => Promise.resolve("success");
+      const result = await withRetry("test-op", fn);
+      expect(result).toBe("success");
+    });
+
+    it("retries on retryable errors and succeeds", async () => {
+      let attempts = 0;
+      const fn = () => {
+        attempts++;
+        if (attempts < 3) {
+          const error = new MattermostAPIError(
+            "Server error",
+            { operation: "test", timestamp: new Date().toISOString() },
+            503
+          );
+          return Promise.reject(error);
+        }
+        return Promise.resolve("success");
+      };
+
+      const result = await withRetry("test-op", fn, { maxRetries: 3, initialDelayMs: 10 });
+      expect(result).toBe("success");
+      expect(attempts).toBe(3);
+    });
+
+    it("does not retry on non-retryable errors", async () => {
+      let attempts = 0;
+      const fn = () => {
+        attempts++;
+        const error = new AuthenticationError(
+          "Auth failed",
+          { operation: "test", timestamp: new Date().toISOString() }
+        );
+        return Promise.reject(error);
+      };
+
+      await expect(
+        withRetry("test-op", fn, { maxRetries: 3, initialDelayMs: 10 })
+      ).rejects.toBeInstanceOf(AuthenticationError);
+      expect(attempts).toBe(1);
+    });
+
+    it("calls onRetry callback", async () => {
+      const onRetry = jest.fn();
+      let attempts = 0;
+      const fn = () => {
+        attempts++;
+        if (attempts < 2) {
+          const error = new NetworkError(
+            "Network error",
+            { operation: "test", timestamp: new Date().toISOString() }
+          );
+          return Promise.reject(error);
+        }
+        return Promise.resolve("success");
+      };
+
+      await withRetry("test-op", fn, {
+        maxRetries: 3,
+        initialDelayMs: 10,
+        onRetry,
+      });
+
+      expect(onRetry).toHaveBeenCalledTimes(1);
+      expect(onRetry).toHaveBeenCalledWith(
+        expect.objectContaining({
+          attempt: 1,
+          maxRetries: 3,
+        })
+      );
+    });
+  });
+
+  describe("ErrorBoundary", () => {
+    it("registers and calls error handlers", () => {
+      const boundary = new ErrorBoundary();
+      const handler = jest.fn();
+      
+      boundary.onError(handler);
+      const error = new Error("Test error");
+      boundary.handle(error);
+      
+      expect(handler).toHaveBeenCalledWith(expect.any(Error));
+    });
+
+    it("wraps functions and handles errors", async () => {
+      const boundary = new ErrorBoundary();
+      const handler = jest.fn();
+      boundary.onError(handler);
+
+      const fn = boundary.wrap(
+        async () => {
+          throw new Error("Wrapped error");
+        },
+        "test-operation"
+      );
+
+      await expect(fn()).rejects.toThrow();
+      expect(handler).toHaveBeenCalled();
+    });
+
+    it("does not call handlers after shutdown", () => {
+      const boundary = new ErrorBoundary();
+      const handler = jest.fn();
+      
+      boundary.onError(handler);
+      boundary.shutdown();
+      boundary.handle(new Error("Test"));
+      
+      expect(handler).not.toHaveBeenCalled();
+    });
+  });
+
+  describe("getUserFriendlyMessage", () => {
+    it("returns userMessage for MattermostError", () => {
+      const error = new AuthenticationError(
+        "Auth failed",
+        { operation: "test", timestamp: new Date().toISOString() }
+      );
+      expect(getUserFriendlyMessage(error)).toBe(error.userMessage);
+    });
+
+    it("returns friendly message for connection errors", () => {
+      const error = new Error("ECONNREFUSED");
+      expect(getUserFriendlyMessage(error)).toContain("Unable to connect");
+    });
+
+    it("returns friendly message for timeout errors", () => {
+      const error = new Error("Request timeout");
+      expect(getUserFriendlyMessage(error)).toContain("timed out");
+    });
+
+    it("returns default message for unknown errors", () => {
+      expect(getUserFriendlyMessage("unknown")).toContain("unexpected error");
+    });
+  });
+
+  describe("createErrorFromResponse", () => {
+    it("creates ValidationError for 400", async () => {
+      const response = new Response(JSON.stringify({ message: "Bad request" }), {
+        status: 400,
+        headers: { "content-type": "application/json" },
+      });
+      
+      const error = await createErrorFromResponse(response, "test-op");
+      expect(error).toBeInstanceOf(ValidationError);
+      expect(error.code).toBe(ErrorCodes.VALIDATION_ERROR);
+    });
+
+    it("creates AuthenticationError for 401", async () => {
+      const response = new Response(JSON.stringify({ message: "Unauthorized" }), {
+        status: 401,
+        headers: { "content-type": "application/json" },
+      });
+      
+      const error = await createErrorFromResponse(response, "test-op");
+      expect(error).toBeInstanceOf(AuthenticationError);
+      expect(error.code).toBe(ErrorCodes.AUTHENTICATION_FAILED);
+    });
+
+    it("creates PermissionError for 403", async () => {
+      const response = new Response(JSON.stringify({ message: "Forbidden" }), {
+        status: 403,
+        headers: { "content-type": "application/json" },
+      });
+      
+      const error = await createErrorFromResponse(response, "test-op");
+      expect(error).toBeInstanceOf(PermissionError);
+      expect(error.code).toBe(ErrorCodes.PERMISSION_DENIED);
+    });
+
+    it("creates ResourceNotFoundError for 404", async () => {
+      const response = new Response(JSON.stringify({ message: "Not found" }), {
+        status: 404,
+        headers: { "content-type": "application/json" },
+      });
+      
+      const error = await createErrorFromResponse(response, "test-op");
+      expect(error).toBeInstanceOf(ResourceNotFoundError);
+      expect(error.code).toBe(ErrorCodes.RESOURCE_NOT_FOUND);
+    });
+
+    it("creates RateLimitError for 429 with retry-after", async () => {
+      const response = new Response(JSON.stringify({ message: "Rate limited" }), {
+        status: 429,
+        headers: { 
+          "content-type": "application/json",
+          "retry-after": "10",
+        },
+      });
+      
+      const error = await createErrorFromResponse(response, "test-op");
+      expect(error).toBeInstanceOf(RateLimitError);
+      expect(error.code).toBe(ErrorCodes.RATE_LIMIT_EXCEEDED);
+      expect((error as RateLimitError).retryAfterMs).toBe(10000);
+    });
+
+    it("creates MattermostAPIError for 5xx", async () => {
+      const response = new Response(JSON.stringify({ message: "Server error" }), {
+        status: 503,
+        headers: { "content-type": "application/json" },
+      });
+      
+      const error = await createErrorFromResponse(response, "test-op");
+      expect(error).toBeInstanceOf(MattermostAPIError);
+      expect(error.code).toBe(ErrorCodes.MATTERMOST_API_SERVER_ERROR);
+      expect(error.retryable).toBe(true);
+    });
+  });
+});

extensions/mattermost/src/errors.ts

@@ -0,0 +1,855 @@
+import { extractErrorCode, formatErrorMessage } from "openclaw/plugin-sdk/error-runtime";
+import { retryAsync, type RetryOptions, type RetryInfo } from "openclaw/plugin-sdk/retry-runtime";
+
+export const ErrorCodes = {
+  MATTERMOST_API_ERROR: "MATTERMOST_API_ERROR",
+  MATTERMOST_API_TIMEOUT: "MATTERMOST_API_TIMEOUT",
+  MATTERMOST_API_RATE_LIMIT: "MATTERMOST_API_RATE_LIMIT",
+  MATTERMOST_API_SERVER_ERROR: "MATTERMOST_API_SERVER_ERROR",
+  
+  AUTHENTICATION_FAILED: "AUTHENTICATION_FAILED",
+  TOKEN_INVALID: "TOKEN_INVALID",
+  TOKEN_EXPIRED: "TOKEN_EXPIRED",
+  INSUFFICIENT_PERMISSIONS: "INSUFFICIENT_PERMISSIONS",
+  
+  VALIDATION_ERROR: "VALIDATION_ERROR",
+  INVALID_BASE_URL: "INVALID_BASE_URL",
+  INVALID_CHANNEL_ID: "INVALID_CHANNEL_ID",
+  INVALID_USER_ID: "INVALID_USER_ID",
+  INVALID_MESSAGE_FORMAT: "INVALID_MESSAGE_FORMAT",
+  
+  PERMISSION_DENIED: "PERMISSION_DENIED",
+  CHANNEL_ACCESS_DENIED: "CHANNEL_ACCESS_DENIED",
+  POST_EDIT_DENIED: "POST_EDIT_DENIED",
+  FILE_UPLOAD_DENIED: "FILE_UPLOAD_DENIED",
+  
+  RATE_LIMIT_EXCEEDED: "RATE_LIMIT_EXCEEDED",
+  RATE_LIMIT_RETRY_AFTER: "RATE_LIMIT_RETRY_AFTER",
+  
+  NETWORK_ERROR: "NETWORK_ERROR",
+  CONNECTION_ERROR: "CONNECTION_ERROR",
+  TIMEOUT_ERROR: "TIMEOUT_ERROR",
+  DNS_ERROR: "DNS_ERROR",
+  
+  RESOURCE_NOT_FOUND: "RESOURCE_NOT_FOUND",
+  USER_NOT_FOUND: "USER_NOT_FOUND",
+  CHANNEL_NOT_FOUND: "CHANNEL_NOT_FOUND",
+  POST_NOT_FOUND: "POST_NOT_FOUND",
+  TEAM_NOT_FOUND: "TEAM_NOT_FOUND",
+  
+  CONFIGURATION_ERROR: "CONFIGURATION_ERROR",
+  MISSING_BOT_TOKEN: "MISSING_BOT_TOKEN",
+  MISSING_BASE_URL: "MISSING_BASE_URL",
+  INVALID_CONFIGURATION: "INVALID_CONFIGURATION",
+  
+  FILE_UPLOAD_FAILED: "FILE_UPLOAD_FAILED",
+  FILE_TOO_LARGE: "FILE_TOO_LARGE",
+  INVALID_FILE_TYPE: "INVALID_FILE_TYPE",
+  
+  WEBSOCKET_ERROR: "WEBSOCKET_ERROR",
+  WEBSOCKET_CONNECTION_FAILED: "WEBSOCKET_CONNECTION_FAILED",
+  WEBSOCKET_MESSAGE_ERROR: "WEBSOCKET_MESSAGE_ERROR",
+  
+  UNKNOWN_ERROR: "UNKNOWN_ERROR",
+  UNEXPECTED_ERROR: "UNEXPECTED_ERROR",
+} as const;
+
+export type ErrorCode = typeof ErrorCodes[keyof typeof ErrorCodes];
+
+export interface ErrorContext {
+  operation: string;
+  accountId?: string;
+  userId?: string;
+  channelId?: string;
+  postId?: string;
+  timestamp?: string;
+  statusCode?: number;
+  requestPath?: string;
+  metadata?: Record<string, unknown>;
+}
+
+export function createErrorContext(
+  operation: string,
+  partial?: Partial<Omit<ErrorContext, "operation" | "timestamp">>
+): ErrorContext {
+  return {
+    operation,
+    timestamp: new Date().toISOString(),
+    ...partial,
+  };
+}
+
+export interface MattermostErrorOptions {
+  code: ErrorCode;
+  message: string;
+  context: ErrorContext;
+  cause?: Error | unknown;
+  retryable?: boolean;
+  userMessage?: string;
+  retryAfterMs?: number;
+}
+
+export class MattermostError extends Error {
+  readonly code: ErrorCode;
+  readonly context: ErrorContext;
+  readonly cause?: Error | unknown;
+  readonly retryable: boolean;
+  readonly userMessage: string;
+  readonly retryAfterMs?: number;
+
+  constructor(options: MattermostErrorOptions) {
+    super(options.message);
+    this.name = "MattermostError";
+    this.code = options.code;
+    this.context = options.context;
+    this.cause = options.cause;
+    this.retryable = options.retryable ?? false;
+    this.userMessage = options.userMessage ?? options.message;
+    this.retryAfterMs = options.retryAfterMs;
+
+    if (Error.captureStackTrace) {
+      Error.captureStackTrace(this, MattermostError);
+    }
+  }
+
+  toJSON(): Record<string, unknown> {
+    const context = this.context as ErrorContext;
+    return {
+      name: this.name,
+      code: this.code,
+      message: this.userMessage,
+      context: {
+        operation: context.operation,
+        accountId: context.accountId,
+        userId: context.userId,
+        channelId: context.channelId,
+        postId: context.postId,
+        timestamp: context.timestamp,
+        statusCode: context.statusCode,
+        requestPath: context.requestPath,
+      },
+      retryable: this.retryable,
+      retryAfterMs: this.retryAfterMs,
+      causeCode: this.cause instanceof MattermostError 
+        ? this.cause.code 
+        : extractErrorCode(this.cause),
+    };
+  }
+
+  toLogString(): string {
+    return `[${this.code}] ${this.userMessage} | Operation: ${this.context.operation} | Time: ${this.context.timestamp}`;
+  }
+}
+
+export class MattermostAPIError extends MattermostError {
+  constructor(
+    message: string,
+    context: ErrorContext,
+    statusCode?: number,
+    cause?: Error | unknown
+  ) {
+    const retryable = statusCode ? isRetryableStatusCode(statusCode) : false;
+    
+    let code: ErrorCode = ErrorCodes.MATTERMOST_API_ERROR;
+    if (statusCode === 429) {
+      code = ErrorCodes.MATTERMOST_API_RATE_LIMIT;
+    } else if (statusCode && statusCode >= 500) {
+      code = ErrorCodes.MATTERMOST_API_SERVER_ERROR;
+    } else if (statusCode && statusCode === 408) {
+      code = ErrorCodes.MATTERMOST_API_TIMEOUT;
+    }
+
+    super({
+      code,
+      message,
+      context: { ...context, statusCode },
+      cause,
+      retryable,
+      userMessage: getUserMessageForStatusCode(statusCode, message),
+    });
+    this.name = "MattermostAPIError";
+  }
+}
+
+export class AuthenticationError extends MattermostError {
+  constructor(
+    message: string,
+    context: ErrorContext,
+    cause?: Error | unknown,
+    specificCode: ErrorCode = ErrorCodes.AUTHENTICATION_FAILED
+  ) {
+    super({
+      code: specificCode,
+      message,
+      context: { ...context, statusCode: 401 },
+      cause,
+      retryable: false,
+      userMessage: "Authentication failed. Please check your bot token and try again.",
+    });
+    this.name = "AuthenticationError";
+  }
+}
+
+export class TokenInvalidError extends AuthenticationError {
+  constructor(context: ErrorContext, cause?: Error | unknown) {
+    super(
+      "The bot token is invalid or has been revoked",
+      context,
+      cause,
+      ErrorCodes.TOKEN_INVALID
+    );
+    this.name = "TokenInvalidError";
+  }
+}
+
+export class TokenExpiredError extends AuthenticationError {
+  constructor(context: ErrorContext, cause?: Error | unknown) {
+    super(
+      "The bot token has expired",
+      context,
+      cause,
+      ErrorCodes.TOKEN_EXPIRED
+    );
+    this.name = "TokenExpiredError";
+  }
+}
+
+export class ValidationError extends MattermostError {
+  constructor(
+    message: string,
+    context: ErrorContext,
+    cause?: Error | unknown,
+    field?: string
+  ) {
+    super({
+      code: ErrorCodes.VALIDATION_ERROR,
+      message,
+      context: { 
+        ...context, 
+        metadata: field ? { field } : undefined 
+      },
+      cause,
+      retryable: false,
+      userMessage: `Validation error: ${message}`,
+    });
+    this.name = "ValidationError";
+  }
+}
+
+export class InvalidBaseUrlError extends ValidationError {
+  constructor(context: ErrorContext, cause?: Error | unknown) {
+    super(
+      "Invalid or missing Mattermost base URL",
+      context,
+      cause,
+      "baseUrl"
+    );
+    this.name = "InvalidBaseUrlError";
+  }
+}
+
+export class PermissionError extends MattermostError {
+  constructor(
+    message: string,
+    context: ErrorContext,
+    cause?: Error | unknown,
+    specificCode: ErrorCode = ErrorCodes.PERMISSION_DENIED
+  ) {
+    super({
+      code: specificCode,
+      message,
+      context: { ...context, statusCode: 403 },
+      cause,
+      retryable: false,
+      userMessage: "Permission denied. You don't have access to perform this action.",
+    });
+    this.name = "PermissionError";
+  }
+}
+
+export class ChannelAccessDeniedError extends PermissionError {
+  constructor(channelId: string, context: ErrorContext, cause?: Error | unknown) {
+    super(
+      `Access denied to channel ${channelId}`,
+      { ...context, channelId },
+      cause,
+      ErrorCodes.CHANNEL_ACCESS_DENIED
+    );
+    this.name = "ChannelAccessDeniedError";
+  }
+}
+
+export class PostEditDeniedError extends PermissionError {
+  constructor(postId: string, context: ErrorContext, cause?: Error | unknown) {
+    super(
+      `Cannot edit post ${postId}: insufficient permissions`,
+      { ...context, postId },
+      cause,
+      ErrorCodes.POST_EDIT_DENIED
+    );
+    this.name = "PostEditDeniedError";
+  }
+}
+
+export class FileUploadDeniedError extends PermissionError {
+  constructor(context: ErrorContext, cause?: Error | unknown) {
+    super(
+      "File upload not permitted",
+      context,
+      cause,
+      ErrorCodes.FILE_UPLOAD_DENIED
+    );
+    this.name = "FileUploadDeniedError";
+  }
+}
+
+export class RateLimitError extends MattermostError {
+  constructor(
+    message: string,
+    context: ErrorContext,
+    retryAfterMs: number,
+    cause?: Error | unknown
+  ) {
+    super({
+      code: ErrorCodes.RATE_LIMIT_EXCEEDED,
+      message,
+      context: { ...context, statusCode: 429 },
+      cause,
+      retryable: true,
+      userMessage: "Rate limit exceeded. Please try again later.",
+      retryAfterMs,
+    });
+    this.name = "RateLimitError";
+  }
+}
+
+export class ResourceNotFoundError extends MattermostError {
+  constructor(
+    resourceType: string,
+    resourceId: string,
+    context: ErrorContext,
+    cause?: Error | unknown
+  ) {
+    const codeMap: Record<string, ErrorCode> = {
+      user: ErrorCodes.USER_NOT_FOUND,
+      channel: ErrorCodes.CHANNEL_NOT_FOUND,
+      post: ErrorCodes.POST_NOT_FOUND,
+      team: ErrorCodes.TEAM_NOT_FOUND,
+    };
+
+    super({
+      code: codeMap[resourceType] ?? ErrorCodes.RESOURCE_NOT_FOUND,
+      message: `${resourceType} not found: ${resourceId}`,
+      context: { ...context, statusCode: 404 },
+      cause,
+      retryable: false,
+      userMessage: `The requested ${resourceType} could not be found.`,
+    });
+    this.name = "ResourceNotFoundError";
+  }
+}
+
+export class ConfigurationError extends MattermostError {
+  constructor(
+    message: string,
+    context: ErrorContext,
+    cause?: Error | unknown,
+    specificCode: ErrorCode = ErrorCodes.CONFIGURATION_ERROR
+  ) {
+    super({
+      code: specificCode,
+      message,
+      context,
+      cause,
+      retryable: false,
+      userMessage: `Configuration error: ${message}. Please check your settings.`,
+    });
+    this.name = "ConfigurationError";
+  }
+}
+
+export class MissingBotTokenError extends ConfigurationError {
+  constructor(context: ErrorContext, cause?: Error | unknown) {
+    super(
+      "Mattermost bot token is required",
+      context,
+      cause,
+      ErrorCodes.MISSING_BOT_TOKEN
+    );
+    this.name = "MissingBotTokenError";
+  }
+}
+
+export class MissingBaseUrlError extends ConfigurationError {
+  constructor(context: ErrorContext, cause?: Error | unknown) {
+    super(
+      "Mattermost baseUrl is required",
+      context,
+      cause,
+      ErrorCodes.MISSING_BASE_URL
+    );
+    this.name = "MissingBaseUrlError";
+  }
+}
+
+export class NetworkError extends MattermostError {
+  constructor(
+    message: string,
+    context: ErrorContext,
+    cause?: Error | unknown,
+    specificCode: ErrorCode = ErrorCodes.NETWORK_ERROR
+  ) {
+    super({
+      code: specificCode,
+      message,
+      context,
+      cause,
+      retryable: true,
+      userMessage: "Network error. Please check your connection and try again.",
+    });
+    this.name = "NetworkError";
+  }
+}
+
+export class ConnectionError extends NetworkError {
+  constructor(context: ErrorContext, cause?: Error | unknown) {
+    super(
+      "Failed to connect to Mattermost server",
+      context,
+      cause,
+      ErrorCodes.CONNECTION_ERROR
+    );
+    this.name = "ConnectionError";
+  }
+}
+
+export class TimeoutError extends NetworkError {
+  constructor(operation: string, context: ErrorContext, cause?: Error | unknown) {
+    super(
+      `Operation timed out: ${operation}`,
+      context,
+      cause,
+      ErrorCodes.TIMEOUT_ERROR
+    );
+    this.name = "TimeoutError";
+  }
+}
+
+function isRetryableStatusCode(statusCode: number): boolean {
+  if (statusCode === 429) return true;
+  if (statusCode >= 500 && statusCode < 600) return true;
+  if (statusCode === 408) return true;
+  return false;
+}
+
+function getUserMessageForStatusCode(statusCode: number | undefined, detail: string): string {
+  if (!statusCode) {
+    return `Mattermost API error: ${detail}`;
+  }
+
+  const messages: Record<number, string> = {
+    400: "Bad request. Please check your input and try again.",
+    401: "Authentication failed. Please check your bot token.",
+    403: "Permission denied. The bot doesn't have access to this resource.",
+    404: "The requested resource was not found.",
+    408: "Request timed out. Please try again.",
+    429: "Rate limit exceeded. Please wait a moment and try again.",
+    500: "Mattermost server error. Please try again later.",
+    502: "Mattermost server is temporarily unavailable. Please try again later.",
+    503: "Mattermost service is temporarily unavailable. Please try again later.",
+    504: "Mattermost server timeout. Please try again later.",
+  };
+
+  return messages[statusCode] ?? `Mattermost API error (${statusCode}): ${detail}`;
+}
+
+export function isRetryableError(error: unknown): boolean {
+  if (error instanceof MattermostError) {
+    return error.retryable;
+  }
+
+  if (typeof error === "object" && error !== null) {
+    const code = (error as { code?: string }).code;
+    if (code && RETRYABLE_ERROR_CODES.has(code)) {
+      return true;
+    }
+
+    const errno = (error as { errno?: string | number }).errno;
+    if (typeof errno === "string" && RETRYABLE_ERROR_CODES.has(errno)) {
+      return true;
+    }
+
+    const message = String((error as { message?: string }).message || "").toLowerCase();
+    if (RETRYABLE_MESSAGE_PATTERNS.some(pattern => message.includes(pattern))) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+const RETRYABLE_ERROR_CODES = new Set([
+  "ECONNRESET",
+  "ECONNREFUSED",
+  "ETIMEDOUT",
+  "ESOCKETTIMEDOUT",
+  "ECONNABORTED",
+  "ENOTFOUND",
+  "EAI_AGAIN",
+  "EHOSTUNREACH",
+  "ENETUNREACH",
+  "EPIPE",
+  "UND_ERR_CONNECT_TIMEOUT",
+  "UND_ERR_DNS_RESOLVE_FAILED",
+  "UND_ERR_CONNECT",
+  "UND_ERR_SOCKET",
+  "UND_ERR_HEADERS_TIMEOUT",
+  "UND_ERR_BODY_TIMEOUT",
+]);
+
+const RETRYABLE_MESSAGE_PATTERNS = [
+  "rate limit",
+  "too many requests",
+  "timeout",
+  "timed out",
+  "network error",
+  "connection refused",
+  "econnreset",
+  "econnrefused",
+  "etimedout",
+  "enotfound",
+  "socket hang up",
+  "getaddrinfo",
+  "temporary",
+  "unavailable",
+  "5",
+];
+
+export function getRetryAfterMs(error: unknown): number | undefined {
+  if (error instanceof RateLimitError) {
+    return error.retryAfterMs;
+  }
+
+  if (typeof error === "object" && error !== null) {
+    const retryAfter = (error as { retryAfter?: number; retry_after?: number }).retryAfter 
+      ?? (error as { retry_after?: number }).retry_after;
+    if (typeof retryAfter === "number" && retryAfter > 0) {
+      return retryAfter * 1000;
+    }
+
+    const headers = (error as { headers?: { get?: (name: string) => string | null } }).headers;
+    if (headers?.get) {
+      const headerValue = headers.get("retry-after");
+      if (headerValue) {
+        const seconds = parseInt(headerValue, 10);
+        if (!isNaN(seconds) && seconds > 0) {
+          return seconds * 1000;
+        }
+      }
+    }
+  }
+
+  return undefined;
+}
+
+export interface RetryConfig {
+  maxRetries?: number;
+  initialDelayMs?: number;
+  maxDelayMs?: number;
+  timeoutMs?: number;
+  onRetry?: (info: RetryAttemptInfo) => void;
+}
+
+export interface RetryAttemptInfo {
+  attempt: number;
+  maxRetries: number;
+  delayMs: number;
+  error: MattermostError | Error;
+}
+
+const DEFAULT_RETRY_CONFIG: Required<RetryConfig> = {
+  maxRetries: 3,
+  initialDelayMs: 1000,
+  maxDelayMs: 30000,
+  timeoutMs: 30000,
+  onRetry: () => {},
+};
+
+export async function withRetry<T>(
+  operation: string,
+  fn: () => Promise<T>,
+  config: RetryConfig = {},
+  context?: Partial<ErrorContext>
+): Promise<T> {
+  const cfg = { ...DEFAULT_RETRY_CONFIG, ...config };
+  let lastError: MattermostError | Error | undefined;
+
+  for (let attempt = 1; attempt <= cfg.maxRetries + 1; attempt++) {
+    try {
+      const controller = new AbortController();
+      const timeoutId = setTimeout(() => controller.abort(), cfg.timeoutMs);
+
+      try {
+        return await fn();
+      } finally {
+        clearTimeout(timeoutId);
+      }
+    } catch (err) {
+      lastError = err instanceof Error ? err : new Error(String(err));
+
+      if (attempt > cfg.maxRetries) {
+        break;
+      }
+
+      if (!isRetryableError(lastError)) {
+        throw lastError;
+      }
+
+      const baseDelay = cfg.initialDelayMs * Math.pow(2, attempt - 1);
+      const jitter = Math.random() * 0.3 * baseDelay;
+      let delayMs = Math.min(baseDelay + jitter, cfg.maxDelayMs);
+
+      const retryAfter = getRetryAfterMs(lastError);
+      if (retryAfter !== undefined) {
+        delayMs = Math.max(delayMs, retryAfter);
+      }
+
+      delayMs = Math.round(delayMs);
+
+      cfg.onRetry({
+        attempt,
+        maxRetries: cfg.maxRetries,
+        delayMs,
+        error: lastError,
+      });
+
+      await sleep(delayMs);
+    }
+  }
+
+  throw lastError ?? new MattermostError({
+    code: ErrorCodes.UNKNOWN_ERROR,
+    message: `Operation failed after ${cfg.maxRetries} retries: ${operation}`,
+    context: createErrorContext(operation, context),
+  });
+}
+
+function sleep(ms: number): Promise<void> {
+  return new Promise(resolve => setTimeout(resolve, ms));
+}
+
+export type ErrorHandler = (error: MattermostError | Error) => void;
+
+export class ErrorBoundary {
+  private handlers: Set<ErrorHandler> = new Set();
+  private isShutdown = false;
+
+  onError(handler: ErrorHandler): () => void {
+    this.handlers.add(handler);
+    return () => this.handlers.delete(handler);
+  }
+
+  handle(error: unknown): void {
+    if (this.isShutdown) {
+      return;
+    }
+
+    const normalizedError = normalizeError(error);
+
+    for (const handler of this.handlers) {
+      try {
+        handler(normalizedError);
+      } catch {
+        // Silently ignore handler failures to avoid console noise
+      }
+    }
+  }
+
+  wrap<T extends (...args: unknown[]) => Promise<unknown>>(
+    fn: T,
+    operation: string,
+    context?: Partial<ErrorContext>
+  ): (...args: Parameters<T>) => Promise<ReturnType<T>> {
+    return async (...args: Parameters<T>): Promise<ReturnType<T>> => {
+      try {
+        return await fn(...args) as ReturnType<T>;
+      } catch (error) {
+        const normalized = normalizeError(error, operation, context);
+        this.handle(normalized);
+        throw normalized;
+      }
+    };
+  }
+
+  shutdown(): void {
+    this.isShutdown = true;
+    this.handlers.clear();
+  }
+}
+
+export const globalErrorBoundary = new ErrorBoundary();
+
+function normalizeError(
+  error: unknown,
+  operation = "unknown",
+  context?: Partial<ErrorContext>
+): MattermostError | Error {
+  if (error instanceof MattermostError) {
+    return error;
+  }
+
+  if (error instanceof Error) {
+    const message = error.message.toLowerCase();
+    
+    if (message.includes("unauthorized") || message.includes("401")) {
+      return new AuthenticationError(
+        error.message,
+        createErrorContext(operation, context),
+        error
+      );
+    }
+
+    if (message.includes("forbidden") || message.includes("403")) {
+      return new PermissionError(
+        error.message,
+        createErrorContext(operation, context),
+        error
+      );
+    }
+
+    if (message.includes("not found") || message.includes("404")) {
+      return new ResourceNotFoundError(
+        "resource",
+        "unknown",
+        createErrorContext(operation, context),
+        error
+      );
+    }
+
+    return error;
+  }
+
+  return new MattermostError({
+    code: ErrorCodes.UNKNOWN_ERROR,
+    message: String(error),
+    context: createErrorContext(operation, context),
+  });
+}
+
+export async function createErrorFromResponse(
+  response: Response,
+  operation: string,
+  context?: Partial<ErrorContext>
+): Promise<MattermostError> {
+  const statusCode = response.status;
+  const errorContext = createErrorContext(operation, {
+    ...context,
+    statusCode,
+    requestPath: response.url,
+  });
+
+  let detail = "Unknown error";
+  try {
+    const contentType = response.headers.get("content-type") ?? "";
+    if (contentType.includes("application/json")) {
+      const data = await response.json() as { message?: string; error?: string };
+      detail = data.message ?? data.error ?? JSON.stringify(data);
+    } else {
+      detail = await response.text();
+    }
+  } catch {
+    detail = response.statusText;
+  }
+
+  switch (statusCode) {
+    case 400:
+      return new ValidationError(
+        `Bad request: ${detail}`,
+        errorContext
+      );
+
+    case 401:
+      return new AuthenticationError(
+        `Authentication failed: ${detail}`,
+        errorContext
+      );
+
+    case 403:
+      return new PermissionError(
+        `Permission denied: ${detail}`,
+        errorContext
+      );
+
+    case 404:
+      return new ResourceNotFoundError(
+        "resource",
+        "unknown",
+        errorContext
+      );
+
+    case 408:
+      return new TimeoutError(
+        operation,
+        errorContext
+      );
+
+    case 429: {
+      const retryAfterHeader = response.headers.get("retry-after");
+      const retryAfterMs = retryAfterHeader 
+        ? parseInt(retryAfterHeader, 10) * 1000 
+        : 5000;
+
+      return new RateLimitError(
+        `Rate limit exceeded: ${detail}`,
+        errorContext,
+        retryAfterMs
+      );
+    }
+
+    case 500:
+    case 502:
+    case 503:
+    case 504:
+      return new MattermostAPIError(
+        `Server error (${statusCode}): ${detail}`,
+        errorContext,
+        statusCode
+      );
+
+    default:
+      return new MattermostAPIError(
+        `API error (${statusCode}): ${detail}`,
+        errorContext,
+        statusCode
+      );
+  }
+}
+
+export function getUserFriendlyMessage(error: unknown): string {
+  if (error instanceof MattermostError) {
+    return error.userMessage;
+  }
+
+  if (error instanceof Error) {
+    const message = error.message.toLowerCase();
+
+    if (message.includes("econnrefused") || message.includes("enotfound")) {
+      return "Unable to connect to Mattermost server. Please check that the server URL is correct and the server is running.";
+    }
+
+    if (message.includes("timeout")) {
+      return "The request timed out. The Mattermost server may be slow or unavailable. Please try again.";
+    }
+
+    if (message.includes("certificate") || message.includes("ssl")) {
+      return "SSL/TLS certificate error. Please check the server configuration or use a valid certificate.";
+    }
+
+    return formatErrorMessage(error);
+  }
+
+  return "An unexpected error occurred. Please try again or contact support if the problem persists.";
+}
+
+export { retryAsync, type RetryOptions, type RetryInfo };
+export { extractErrorCode, formatErrorMessage };

extensions/mattermost/src/group-mentions.test.ts

@@ -0,0 +1,46 @@
+import { describe, expect, it } from "vitest";
+import type { OpenClawConfig } from "../runtime-api.js";
+import { resolveMattermostGroupRequireMention } from "./group-mentions.js";
+
+describe("resolveMattermostGroupRequireMention", () => {
+  it("defaults to requiring mention when no override is configured", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {},
+      },
+    };
+
+    const requireMention = resolveMattermostGroupRequireMention({ cfg, accountId: "default" });
+    expect(requireMention).toBe(true);
+  });
+
+  it("respects chatmode-derived account override", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          chatmode: "onmessage",
+        },
+      },
+    };
+
+    const requireMention = resolveMattermostGroupRequireMention({ cfg, accountId: "default" });
+    expect(requireMention).toBe(false);
+  });
+
+  it("prefers an explicit runtime override when provided", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          chatmode: "oncall",
+        },
+      },
+    };
+
+    const requireMention = resolveMattermostGroupRequireMention({
+      cfg,
+      accountId: "default",
+      requireMentionOverride: false,
+    });
+    expect(requireMention).toBe(false);
+  });
+});

extensions/mattermost/src/group-mentions.ts

@@ -0,0 +1,23 @@
+import { resolveChannelGroupRequireMention } from "openclaw/plugin-sdk/channel-policy";
+import { resolveMattermostAccount } from "./mattermost/accounts.js";
+import type { ChannelGroupContext } from "./runtime-api.js";
+
+export function resolveMattermostGroupRequireMention(
+  params: ChannelGroupContext & { requireMentionOverride?: boolean },
+): boolean | undefined {
+  const account = resolveMattermostAccount({
+    cfg: params.cfg,
+    accountId: params.accountId,
+  });
+  const requireMentionOverride =
+    typeof params.requireMentionOverride === "boolean"
+      ? params.requireMentionOverride
+      : account.requireMention;
+  return resolveChannelGroupRequireMention({
+    cfg: params.cfg,
+    channel: "mattermost",
+    groupId: params.groupId,
+    accountId: params.accountId,
+    requireMentionOverride,
+  });
+}

extensions/mattermost/src/interactive-replies.test.ts

@@ -0,0 +1,271 @@
+import { describe, it, expect } from "vitest";
+import {
+  compileMattermostInteractiveReplies,
+  isMattermostInteractiveRepliesEnabled,
+  sanitizeButtonValue,
+  validateInteractiveChoices,
+} from "../interactive-replies.js";
+import type { OpenClawConfig } from "openclaw/plugin-sdk/config-runtime";
+import type { ReplyPayload } from "openclaw/plugin-sdk/reply-runtime";
+
+describe("compileMattermostInteractiveReplies", () => {
+  it("should parse button directives correctly", () => {
+    const payload: ReplyPayload = {
+      text: "Please select an action: [[mattermost_buttons: Approve:approve:primary, Reject:reject:danger]]",
+    };
+
+    const result = compileMattermostInteractiveReplies(payload);
+
+    expect(result.interactive).toBeDefined();
+    expect(result.interactive?.blocks).toHaveLength(2);
+    expect(result.interactive?.blocks[0]).toEqual({ type: "text", text: "Please select an action:" });
+    expect(result.interactive?.blocks[1]).toEqual({
+      type: "buttons",
+      buttons: [
+        { label: "Approve", value: "approve", style: "primary" },
+        { label: "Reject", value: "reject", style: "danger" },
+      ],
+    });
+    expect(result.text).toBe("Please select an action:");
+  });
+
+  it("should parse select directives correctly", () => {
+    const payload: ReplyPayload = {
+      text: "Choose a priority: [[mattermost_select: Select Priority | Low:low, Medium:medium, High:high]]",
+    };
+
+    const result = compileMattermostInteractiveReplies(payload);
+
+    expect(result.interactive).toBeDefined();
+    expect(result.interactive?.blocks).toHaveLength(2);
+    expect(result.interactive?.blocks[1]).toEqual({
+      type: "select",
+      placeholder: "Select Priority",
+      options: [
+        { label: "Low", value: "low" },
+        { label: "Medium", value: "medium" },
+        { label: "High", value: "high" },
+      ],
+    });
+  });
+
+  it("should handle mixed buttons and selects", () => {
+    const payload: ReplyPayload = {
+      text: "First: [[mattermost_buttons: Yes:yes, No:no]] Second: [[mattermost_select: Pick | A:a, B:b]]",
+    };
+
+    const result = compileMattermostInteractiveReplies(payload);
+
+    expect(result.interactive?.blocks).toHaveLength(4);
+    expect(result.interactive?.blocks[0]).toEqual({ type: "text", text: "First:" });
+    expect(result.interactive?.blocks[1]?.type).toBe("buttons");
+    expect(result.interactive?.blocks[2]).toEqual({ type: "text", text: " Second:" });
+    expect(result.interactive?.blocks[3]?.type).toBe("select");
+  });
+
+  it("should return original payload when no directives present", () => {
+    const payload: ReplyPayload = {
+      text: "Just a normal message without directives",
+    };
+
+    const result = compileMattermostInteractiveReplies(payload);
+
+    expect(result).toEqual(payload);
+  });
+
+  it("should handle empty text", () => {
+    const payload: ReplyPayload = {
+      text: "",
+    };
+
+    const result = compileMattermostInteractiveReplies(payload);
+
+    expect(result).toEqual(payload);
+  });
+
+  it("should preserve existing interactive blocks", () => {
+    const payload: ReplyPayload = {
+      text: "[[mattermost_buttons: OK:ok]]",
+      interactive: {
+        blocks: [{ type: "text", text: "Existing text" }],
+      },
+    };
+
+    const result = compileMattermostInteractiveReplies(payload);
+
+    expect(result.interactive?.blocks).toHaveLength(2);
+    expect(result.interactive?.blocks[0]).toEqual({ type: "text", text: "Existing text" });
+    expect(result.interactive?.blocks[1]?.type).toBe("buttons");
+  });
+
+  it("should handle buttons without explicit style (defaults to undefined)", () => {
+    const payload: ReplyPayload = {
+      text: "[[mattermost_buttons: Button1:val1, Button2:val2]]",
+    };
+
+    const result = compileMattermostInteractiveReplies(payload);
+
+    const buttons = result.interactive?.blocks[0] as { type: "buttons"; buttons: Array<{ style?: string }> };
+    expect(buttons.buttons[0].style).toBeUndefined();
+    expect(buttons.buttons[1].style).toBeUndefined();
+  });
+
+  it("should handle select without placeholder", () => {
+    const payload: ReplyPayload = {
+      text: "[[mattermost_select: Option1:opt1, Option2:opt2]]",
+    };
+
+    const result = compileMattermostInteractiveReplies(payload);
+
+    const select = result.interactive?.blocks[0] as { type: "select"; placeholder: string };
+    expect(select.placeholder).toBe("Choose an option");
+  });
+
+  it("should limit buttons to maximum of 5", () => {
+    const payload: ReplyPayload = {
+      text: "[[mattermost_buttons: A:a, B:b, C:c, D:d, E:e, F:f]]",
+    };
+
+    const result = compileMattermostInteractiveReplies(payload);
+
+    const buttons = result.interactive?.blocks[0] as { type: "buttons"; buttons: Array<unknown> };
+    expect(buttons.buttons).toHaveLength(5);
+  });
+
+  it("should ignore invalid directives gracefully", () => {
+    const payload: ReplyPayload = {
+      text: "Valid: [[mattermost_buttons: OK:ok]] Invalid: [[mattermost_buttons:]] End",
+    };
+
+    const result = compileMattermostInteractiveReplies(payload);
+
+    // Should still process the valid directive
+    expect(result.interactive?.blocks).toHaveLength(3);
+    expect(result.text).toContain("Valid:");
+    expect(result.text).toContain("Invalid:");
+    expect(result.text).toContain("End");
+  });
+
+  it("should sanitize potentially dangerous values", () => {
+    const payload: ReplyPayload = {
+      text: "[[mattermost_buttons: Test:<script>alert('xss')</script>]]",
+    };
+
+    const result = compileMattermostInteractiveReplies(payload);
+    const buttons = result.interactive?.blocks[0] as { type: "buttons"; buttons: Array<{ value: string }> };
+    expect(buttons.buttons[0].value).not.toContain("<script>");
+  });
+});
+
+describe("isMattermostInteractiveRepliesEnabled", () => {
+  it("should return true when interactiveReplies in array capabilities", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          capabilities: ["interactiveReplies"],
+        },
+      },
+    };
+
+    const result = isMattermostInteractiveRepliesEnabled({ cfg });
+    expect(result).toBe(true);
+  });
+
+  it("should return true when interactiveReplies in object capabilities", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          capabilities: {
+            interactiveReplies: true,
+          },
+        },
+      },
+    };
+
+    const result = isMattermostInteractiveRepliesEnabled({ cfg });
+    expect(result).toBe(true);
+  });
+
+  it("should return false when capabilities is empty", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {},
+      },
+    };
+
+    const result = isMattermostInteractiveRepliesEnabled({ cfg });
+    expect(result).toBe(false);
+  });
+
+  it("should return false when interactiveReplies is false", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          capabilities: {
+            interactiveReplies: false,
+          },
+        },
+      },
+    };
+
+    const result = isMattermostInteractiveRepliesEnabled({ cfg });
+    expect(result).toBe(false);
+  });
+});
+
+describe("sanitizeButtonValue", () => {
+  it("should remove dangerous characters", () => {
+    const value = "<script>alert('xss')</script>";
+    const sanitized = sanitizeButtonValue(value);
+    expect(sanitized).not.toContain("<");
+    expect(sanitized).not.toContain(">");
+  });
+
+  it("should limit value length to 100 characters", () => {
+    const value = "a".repeat(200);
+    const sanitized = sanitizeButtonValue(value);
+    expect(sanitized.length).toBe(100);
+  });
+
+  it("should preserve safe alphanumeric characters", () => {
+    const value = "safe_value-123";
+    const sanitized = sanitizeButtonValue(value);
+    expect(sanitized).toBe("safe_value-123");
+  });
+});
+
+describe("validateInteractiveChoices", () => {
+  it("should return sanitized choices for valid input", () => {
+    const choices = [
+      { label: "OK", value: "ok", style: "primary" as const },
+      { label: "Cancel", value: "cancel", style: "danger" as const },
+    ];
+
+    const result = validateInteractiveChoices(choices);
+    expect(result).toHaveLength(2);
+    expect(result?.[0].label).toBe("OK");
+    expect(result?.[0].style).toBe("primary");
+  });
+
+  it("should return null for empty choices", () => {
+    const result = validateInteractiveChoices([]);
+    expect(result).toBeNull();
+  });
+
+  it("should deduplicate by value", () => {
+    const choices = [
+      { label: "A", value: "dup" },
+      { label: "B", value: "DUP" }, // Same value, different case
+    ];
+
+    const result = validateInteractiveChoices(choices);
+    expect(result).toHaveLength(1);
+  });
+
+  it("should truncate labels to 30 characters", () => {
+    const choices = [{ label: "a".repeat(50), value: "val" }];
+
+    const result = validateInteractiveChoices(choices);
+    expect(result?.[0].label.length).toBe(30);
+  });
+});

extensions/mattermost/src/interactive-replies.ts

@@ -0,0 +1,317 @@
+import type { OpenClawConfig } from "openclaw/plugin-sdk/config-runtime";
+import type { ReplyPayload } from "openclaw/plugin-sdk/reply-runtime";
+import {
+  resolveDefaultMattermostAccountId,
+  resolveMattermostAccount,
+  type ResolvedMattermostAccount,
+} from "./mattermost/accounts.js";
+
+// Maximum items for Mattermost interactive components
+const MATTERMOST_BUTTON_MAX_ITEMS = 5;
+const MATTERMOST_SELECT_MAX_ITEMS = 100;
+
+// Directive regex pattern for [[mattermost_buttons: ...]] and [[mattermost_select: ...]]
+const MATTERMOST_DIRECTIVE_RE = /\[\[mattermost_(buttons|select):\s*([^\]]+)\]\]/gi;
+
+// Button styles supported by Mattermost
+const VALID_BUTTON_STYLES = new Set(["default", "primary", "danger"]);
+
+type MattermostChoice = {
+  label: string;
+  value: string;
+  style?: "default" | "primary" | "danger";
+};
+
+/**
+ * Parse a single choice from a raw string.
+ * Format: "Label:value" or "Label:value:style"
+ * Style is optional and defaults to "default"
+ */
+function parseChoice(raw: string, options?: { allowStyle?: boolean }): MattermostChoice | null {
+  const trimmed = raw.trim();
+  if (!trimmed) {
+    return null;
+  }
+
+  // Split by first colon to get label and value+style
+  const delimiter = trimmed.indexOf(":");
+  if (delimiter === -1) {
+    // No colon: use trimmed as both label and value
+    return {
+      label: trimmed,
+      value: trimmed,
+    };
+  }
+
+  const label = trimmed.slice(0, delimiter).trim();
+  let valueAndStyle = trimmed.slice(delimiter + 1).trim();
+
+  if (!label || !valueAndStyle) {
+    return null;
+  }
+
+  // Check for style suffix if enabled
+  let style: MattermostChoice["style"];
+  if (options?.allowStyle) {
+    const lastColon = valueAndStyle.lastIndexOf(":");
+    if (lastColon !== -1) {
+      const maybeStyle = valueAndStyle.slice(lastColon + 1).trim().toLowerCase();
+      if (VALID_BUTTON_STYLES.has(maybeStyle)) {
+        const valueOnly = valueAndStyle.slice(0, lastColon).trim();
+        if (valueOnly) {
+          valueAndStyle = valueOnly;
+          style = maybeStyle as MattermostChoice["style"];
+        }
+      }
+    }
+  }
+
+  return { label, value: valueAndStyle, style };
+}
+
+/**
+ * Parse multiple choices from a comma-separated string.
+ */
+function parseChoices(
+  raw: string,
+  maxItems: number,
+  options?: { allowStyle?: boolean },
+): MattermostChoice[] {
+  return raw
+    .split(",")
+    .map((entry) => parseChoice(entry, options))
+    .filter((entry): entry is MattermostChoice => Boolean(entry))
+    .slice(0, maxItems);
+}
+
+/**
+ * Build a text block for interactive payload.
+ */
+function buildTextBlock(
+  text: string,
+): NonNullable<ReplyPayload["interactive"]>["blocks"][number] | null {
+  const trimmed = text.trim();
+  if (!trimmed) {
+    return null;
+  }
+  return { type: "text", text: trimmed };
+}
+
+/**
+ * Build a buttons block from a raw directive body.
+ * Format: "Label1:value1:primary, Label2:value2:danger"
+ */
+function buildButtonsBlock(
+  raw: string,
+): NonNullable<ReplyPayload["interactive"]>["blocks"][number] | null {
+  const choices = parseChoices(raw, MATTERMOST_BUTTON_MAX_ITEMS, { allowStyle: true });
+  if (choices.length === 0) {
+    return null;
+  }
+
+  return {
+    type: "buttons",
+    buttons: choices.map((choice) => ({
+      label: choice.label,
+      value: choice.value,
+      ...(choice.style && choice.style !== "default" ? { style: choice.style } : {}),
+    })),
+  };
+}
+
+/**
+ * Build a select (dropdown) block from a raw directive body.
+ * Format: "Placeholder | Label1:value1, Label2:value2"
+ * Or without placeholder: "Label1:value1, Label2:value2"
+ */
+function buildSelectBlock(
+  raw: string,
+): NonNullable<ReplyPayload["interactive"]>["blocks"][number] | null {
+  // Split by pipe to separate placeholder from options
+  const parts = raw
+    .split("|")
+    .map((entry) => entry.trim())
+    .filter(Boolean);
+
+  if (parts.length === 0) {
+    return null;
+  }
+
+  const [first, second] = parts;
+  const placeholder = parts.length >= 2 ? first : "Choose an option";
+  const optionsRaw = parts.length >= 2 ? second : first;
+
+  const choices = parseChoices(optionsRaw, MATTERMOST_SELECT_MAX_ITEMS);
+  if (choices.length === 0) {
+    return null;
+  }
+
+  return {
+    type: "select",
+    placeholder,
+    options: choices,
+  };
+}
+
+/**
+ * Check if interactive replies capability is enabled for an account.
+ * Supports both array format ("interactiveReplies") and object format ({ interactiveReplies: true })
+ */
+function resolveInteractiveRepliesFromCapabilities(capabilities: unknown): boolean {
+  if (!capabilities) {
+    return false;
+  }
+
+  if (Array.isArray(capabilities)) {
+    return capabilities.some(
+      (entry) => String(entry).trim().toLowerCase() === "interactivereplies",
+    );
+  }
+
+  if (typeof capabilities === "object") {
+    return (capabilities as { interactiveReplies?: unknown }).interactiveReplies === true;
+  }
+
+  return false;
+}
+
+/**
+ * Check if interactive replies are enabled for a specific Mattermost account.
+ */
+export function isMattermostInteractiveRepliesEnabled(params: {
+  cfg: OpenClawConfig;
+  accountId?: string | null;
+}): boolean {
+  const account = resolveMattermostAccount({
+    cfg: params.cfg,
+    accountId: params.accountId ?? resolveDefaultMattermostAccountId(params.cfg),
+  });
+
+  return resolveInteractiveRepliesFromCapabilities(account.config.capabilities);
+}
+
+/**
+ * Compile Mattermost interactive directives from a reply payload.
+ * Parses [[mattermost_buttons: ...]] and [[mattermost_select: ...]] directives
+ * and converts them to interactive blocks.
+ *
+ * @param payload - The reply payload potentially containing directives
+ * @returns Modified payload with parsed interactive blocks
+ */
+export function compileMattermostInteractiveReplies(payload: ReplyPayload): ReplyPayload {
+  const text = payload.text;
+  if (!text) {
+    return payload;
+  }
+
+  const generatedBlocks: NonNullable<ReplyPayload["interactive"]>["blocks"] = [];
+  const visibleTextParts: string[] = [];
+  let cursor = 0;
+  let matchedDirective = false;
+  let generatedInteractiveBlock = false;
+
+  // Reset regex state
+  MATTERMOST_DIRECTIVE_RE.lastIndex = 0;
+
+  // Find all directives in the text
+  for (const match of text.matchAll(MATTERMOST_DIRECTIVE_RE)) {
+    matchedDirective = true;
+    const matchText = match[0];
+    const directiveType = match[1];
+    const body = match[2];
+    const index = match.index ?? 0;
+
+    // Capture text before this directive
+    const precedingText = text.slice(cursor, index);
+    visibleTextParts.push(precedingText);
+
+    // Add text block if there's content
+    const textBlock = buildTextBlock(precedingText);
+    if (textBlock) {
+      generatedBlocks.push(textBlock);
+    }
+
+    // Build the appropriate interactive block
+    const block =
+      directiveType.toLowerCase() === "buttons"
+        ? buildButtonsBlock(body)
+        : buildSelectBlock(body);
+
+    if (block) {
+      generatedInteractiveBlock = true;
+      generatedBlocks.push(block);
+    }
+
+    cursor = index + matchText.length;
+  }
+
+  // Capture any trailing text after the last directive
+  const trailingText = text.slice(cursor);
+  visibleTextParts.push(trailingText);
+
+  const trailingBlock = buildTextBlock(trailingText);
+  if (trailingBlock) {
+    generatedBlocks.push(trailingBlock);
+  }
+
+  // Clean the visible text by removing the directive syntax
+  const cleanedText = visibleTextParts.join("");
+
+  // If no directives were found or no blocks were generated, return original payload
+  if (!matchedDirective || !generatedInteractiveBlock) {
+    return payload;
+  }
+
+  // Merge generated blocks with any existing interactive blocks
+  return {
+    ...payload,
+    text: cleanedText.trim() || undefined,
+    interactive: {
+      blocks: [...(payload.interactive?.blocks ?? []), ...generatedBlocks],
+    },
+  };
+}
+
+/**
+ * Sanitize button value for use in Mattermost callbacks.
+ * Removes potentially dangerous characters that could cause issues.
+ */
+export function sanitizeButtonValue(value: string): string {
+  // Remove any potentially dangerous characters
+  // Only allow alphanumeric, spaces, and common safe punctuation
+  return value
+    .replace(/[<>\{\}\[\]\\]/g, "")
+    .slice(0, 100); // Limit length
+}
+
+/**
+ * Validate that a button/select configuration is safe to render.
+ * Returns sanitized choices or null if validation fails.
+ */
+export function validateInteractiveChoices(choices: MattermostChoice[]): MattermostChoice[] | null {
+  if (!choices.length || choices.length > MATTERMOST_BUTTON_MAX_ITEMS) {
+    return null;
+  }
+
+  const seenValues = new Set<string>();
+  const sanitized: MattermostChoice[] = [];
+
+  for (const choice of choices) {
+    const sanitizedValue = sanitizeButtonValue(choice.value);
+    const sanitizedLabel = choice.label.slice(0, 30); // Mattermost UI limit
+
+    // Skip duplicates
+    if (seenValues.has(sanitizedValue.toLowerCase())) {
+      continue;
+    }
+    seenValues.add(sanitizedValue.toLowerCase());
+
+    sanitized.push({
+      label: sanitizedLabel,
+      value: sanitizedValue,
+      style: choice.style && VALID_BUTTON_STYLES.has(choice.style) ? choice.style : undefined,
+    });
+  }
+
+  return sanitized.length > 0 ? sanitized : null;
+}

extensions/mattermost/src/mattermost/accounts.test.ts

@@ -0,0 +1,138 @@
+import { describe, expect, it } from "vitest";
+import type { OpenClawConfig } from "../../runtime-api.js";
+import {
+  resolveDefaultMattermostAccountId,
+  resolveMattermostAccount,
+  resolveMattermostReplyToMode,
+} from "./accounts.js";
+
+describe("resolveDefaultMattermostAccountId", () => {
+  it("prefers channels.mattermost.defaultAccount when it matches a configured account", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          defaultAccount: "alerts",
+          accounts: {
+            default: { botToken: "tok-default", baseUrl: "https://chat.example.com" },
+            alerts: { botToken: "tok-alerts", baseUrl: "https://alerts.example.com" },
+          },
+        },
+      },
+    };
+
+    expect(resolveDefaultMattermostAccountId(cfg)).toBe("alerts");
+  });
+
+  it("normalizes channels.mattermost.defaultAccount before lookup", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          defaultAccount: "Ops Team",
+          accounts: {
+            "ops-team": { botToken: "tok-ops", baseUrl: "https://chat.example.com" },
+          },
+        },
+      },
+    };
+
+    expect(resolveDefaultMattermostAccountId(cfg)).toBe("ops-team");
+  });
+
+  it("falls back when channels.mattermost.defaultAccount is missing", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          defaultAccount: "missing",
+          accounts: {
+            default: { botToken: "tok-default", baseUrl: "https://chat.example.com" },
+            alerts: { botToken: "tok-alerts", baseUrl: "https://alerts.example.com" },
+          },
+        },
+      },
+    };
+
+    expect(resolveDefaultMattermostAccountId(cfg)).toBe("default");
+  });
+});
+
+describe("resolveMattermostReplyToMode", () => {
+  it("uses configured defaultAccount when accountId is omitted", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          defaultAccount: "alerts",
+          accounts: {
+            alerts: {
+              botToken: "tok-alerts",
+              baseUrl: "https://alerts.example.com",
+              replyToMode: "all",
+            },
+          },
+        },
+      },
+    };
+
+    const account = resolveMattermostAccount({ cfg });
+    expect(account.accountId).toBe("alerts");
+    expect(resolveMattermostReplyToMode(account, "channel")).toBe("all");
+  });
+
+  it("uses the configured mode for channel and group messages", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          replyToMode: "all",
+        },
+      },
+    };
+
+    const account = resolveMattermostAccount({ cfg, accountId: "default" });
+    expect(resolveMattermostReplyToMode(account, "channel")).toBe("all");
+    expect(resolveMattermostReplyToMode(account, "group")).toBe("all");
+  });
+
+  it("keeps direct messages off even when replyToMode is enabled", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          replyToMode: "all",
+        },
+      },
+    };
+
+    const account = resolveMattermostAccount({ cfg, accountId: "default" });
+    expect(resolveMattermostReplyToMode(account, "direct")).toBe("off");
+  });
+
+  it("defaults to off when replyToMode is unset", () => {
+    const account = resolveMattermostAccount({ cfg: {}, accountId: "default" });
+    expect(resolveMattermostReplyToMode(account, "channel")).toBe("off");
+  });
+
+  it("preserves shared commands config when an account overrides one commands field", () => {
+    const account = resolveMattermostAccount({
+      cfg: {
+        channels: {
+          mattermost: {
+            commands: {
+              native: true,
+            },
+            accounts: {
+              work: {
+                commands: {
+                  callbackPath: "/hooks/work",
+                },
+              },
+            },
+          },
+        },
+      },
+      accountId: "work",
+    });
+
+    expect(account.config.commands).toEqual({
+      native: true,
+      callbackPath: "/hooks/work",
+    });
+  });
+});

extensions/mattermost/src/mattermost/accounts.ts

@@ -0,0 +1,159 @@
+import { createAccountListHelpers } from "openclaw/plugin-sdk/account-helpers";
+import { DEFAULT_ACCOUNT_ID, normalizeAccountId } from "openclaw/plugin-sdk/account-id";
+import { resolveMergedAccountConfig } from "openclaw/plugin-sdk/account-resolution";
+import { normalizeResolvedSecretInputString, normalizeSecretInputString } from "../secret-input.js";
+import type {
+  MattermostAccountConfig,
+  MattermostChatMode,
+  MattermostChatTypeKey,
+  MattermostReplyToMode,
+} from "../types.js";
+import { normalizeMattermostBaseUrl } from "./client.js";
+import type { OpenClawConfig } from "./runtime-api.js";
+
+export type MattermostTokenSource = "env" | "config" | "none";
+export type MattermostBaseUrlSource = "env" | "config" | "none";
+
+export type ResolvedMattermostAccount = {
+  accountId: string;
+  enabled: boolean;
+  name?: string;
+  botToken?: string;
+  botTokenSource?: MattermostTokenSource;
+  pat?: string;
+  baseUrl?: string;
+  baseUrlSource?: MattermostBaseUrlSource;
+  config: MattermostAccountConfig;
+  chatmode?: MattermostChatMode;
+  oncharPrefixes?: string[];
+  requireMention?: boolean;
+  textChunkLimit?: number;
+  blockStreaming?: boolean;
+  blockStreamingCoalesce?: MattermostAccountConfig["blockStreamingCoalesce"];
+};
+
+const mattermostAccountHelpers = createAccountListHelpers("mattermost");
+
+export function listMattermostAccountIds(cfg: OpenClawConfig): string[] {
+  return mattermostAccountHelpers.listAccountIds(cfg);
+}
+
+export function resolveDefaultMattermostAccountId(cfg: OpenClawConfig): string {
+  return mattermostAccountHelpers.resolveDefaultAccountId(cfg);
+}
+
+function mergeMattermostAccountConfig(
+  cfg: OpenClawConfig,
+  accountId: string,
+): MattermostAccountConfig {
+  return resolveMergedAccountConfig<MattermostAccountConfig>({
+    channelConfig: cfg.channels?.mattermost as MattermostAccountConfig | undefined,
+    accounts: cfg.channels?.mattermost?.accounts as
+      | Record<string, Partial<MattermostAccountConfig>>
+      | undefined,
+    accountId,
+    omitKeys: ["defaultAccount"],
+    nestedObjectKeys: ["commands"],
+  });
+}
+
+function resolveMattermostRequireMention(config: MattermostAccountConfig): boolean | undefined {
+  if (config.chatmode === "oncall") {
+    return true;
+  }
+  if (config.chatmode === "onmessage") {
+    return false;
+  }
+  if (config.chatmode === "onchar") {
+    return true;
+  }
+  return config.requireMention;
+}
+
+export function resolveMattermostAccount(params: {
+  cfg: OpenClawConfig;
+  accountId?: string | null;
+  allowUnresolvedSecretRef?: boolean;
+}): ResolvedMattermostAccount {
+  const accountId = normalizeAccountId(
+    params.accountId ?? resolveDefaultMattermostAccountId(params.cfg),
+  );
+  const baseEnabled = params.cfg.channels?.mattermost?.enabled !== false;
+  const merged = mergeMattermostAccountConfig(params.cfg, accountId);
+  const accountEnabled = merged.enabled !== false;
+  const enabled = baseEnabled && accountEnabled;
+
+  const allowEnv = accountId === DEFAULT_ACCOUNT_ID;
+  const envToken = allowEnv ? process.env.MATTERMOST_BOT_TOKEN?.trim() : undefined;
+  const envPat = allowEnv ? process.env.MATTERMOST_PAT?.trim() : undefined;
+  const envUrl = allowEnv ? process.env.MATTERMOST_URL?.trim() : undefined;
+  const configToken = params.allowUnresolvedSecretRef
+    ? normalizeSecretInputString(merged.botToken)
+    : normalizeResolvedSecretInputString({
+        value: merged.botToken,
+        path: `channels.mattermost.accounts.${accountId}.botToken`,
+      });
+  const configPat = params.allowUnresolvedSecretRef
+    ? normalizeSecretInputString(merged.pat)
+    : normalizeResolvedSecretInputString({
+        value: merged.pat,
+        path: `channels.mattermost.accounts.${accountId}.pat`,
+      });
+  const configUrl = merged.baseUrl?.trim();
+  const botToken = configToken || envToken;
+  const pat = configPat || envPat;
+  const baseUrl = normalizeMattermostBaseUrl(configUrl || envUrl);
+  const requireMention = resolveMattermostRequireMention(merged);
+
+  let botTokenSource: MattermostTokenSource = "none";
+  if (configToken) {
+    botTokenSource = "config";
+  } else if (envToken) {
+    botTokenSource = "env";
+  }
+
+  let baseUrlSource: MattermostBaseUrlSource = "none";
+  if (configUrl) {
+    baseUrlSource = "config";
+  } else if (envUrl) {
+    baseUrlSource = "env";
+  }
+
+  return {
+    accountId,
+    enabled,
+    name: merged.name?.trim() || undefined,
+    botToken,
+    botTokenSource,
+    pat,
+    baseUrl,
+    baseUrlSource,
+    config: merged,
+    chatmode: merged.chatmode,
+    oncharPrefixes: merged.oncharPrefixes,
+    requireMention,
+    textChunkLimit: merged.textChunkLimit,
+    blockStreaming: merged.blockStreaming,
+    blockStreamingCoalesce: merged.blockStreamingCoalesce,
+  };
+}
+
+/**
+ * Resolve the effective replyToMode for a given chat type.
+ * Mattermost auto-threading only applies to channel and group messages.
+ */
+export function resolveMattermostReplyToMode(
+  account: ResolvedMattermostAccount,
+  kind: MattermostChatTypeKey,
+): MattermostReplyToMode {
+  if (kind === "direct") {
+    return "off";
+  }
+  return account.config.replyToMode ?? "off";
+}
+
+export function listEnabledMattermostAccounts(cfg: OpenClawConfig): ResolvedMattermostAccount[] {
+  return listMattermostAccountIds(cfg)
+    .map((accountId) => resolveMattermostAccount({ cfg, accountId }))
+    .filter((account) => account.enabled);
+}

extensions/mattermost/src/mattermost/actions.ts

@@ -0,0 +1,551 @@
+import { createWriteStream } from "node:fs";
+import { mkdir, unlink } from "node:fs/promises";
+import { dirname, extname } from "node:path";
+import { resolveMattermostAccount } from "./accounts.js";
+import {
+  createMattermostClient,
+  fetchMattermostMe,
+  type MattermostClient,
+  type MattermostFetch,
+} from "./client.js";
+import type { OpenClawConfig } from "./runtime-api.js";
+
+/** Default maximum file size (100MB in bytes) */
+export const DEFAULT_MAX_FILE_SIZE = 100 * 1024 * 1024;
+
+/** Blocked executable file extensions */
+export const BLOCKED_EXTENSIONS = new Set([
+  ".exe",
+  ".sh",
+  ".bat",
+  ".cmd",
+  ".com",
+  ".msi",
+  ".dll",
+  ".so",
+  ".dylib",
+  ".app",
+  ".dmg",
+  ".pkg",
+  ".deb",
+  ".rpm",
+  ".apk",
+  ".ipa",
+  ".jar",
+  ".war",
+  ".ear",
+  ".py",
+  ".rb",
+  ".pl",
+  ".php",
+  ".js",
+  ".ts",
+  ".vbs",
+  ".ps1",
+  ".psm1",
+  ".scr",
+  ".hta",
+  ".bin",
+  ".run",
+  ".out",
+  ".elf",
+]);
+
+/** Allowed MIME type prefixes (configurable allowlist) */
+export const ALLOWED_MIME_PREFIXES = [
+  "image/",
+  "video/",
+  "audio/",
+  "text/",
+  "application/pdf",
+  "application/json",
+  "application/xml",
+  "application/csv",
+  "application/zip",
+  "application/x-zip",
+  "application/x-zip-compressed",
+  "application/gzip",
+  "application/x-gzip",
+  "application/tar",
+  "application/x-tar",
+];
+
+export type EditMessageResult =
+  | { ok: true; postId: string; channelId: string }
+  | { ok: false; error: string; errorCode?: string };
+
+export type EditMessageParams = {
+  cfg: OpenClawConfig;
+  postId: string;
+  channelId: string;
+  message: string;
+  props?: Record<string, unknown>;
+  accountId?: string | null;
+  fetchImpl?: MattermostFetch;
+};
+
+const BOT_USER_CACHE_TTL_MS = 10 * 60_000;
+const botUserIdCache = new Map<string, { userId: string; expiresAt: number }>();
+
+async function resolveBotUserId(
+  client: MattermostClient,
+  cacheKey: string,
+): Promise<string | null> {
+  const cached = botUserIdCache.get(cacheKey);
+  if (cached && cached.expiresAt > Date.now()) {
+    return cached.userId;
+  }
+  const me = await fetchMattermostMe(client);
+  const userId = me?.id?.trim();
+  if (!userId) {
+    return null;
+  }
+  botUserIdCache.set(cacheKey, { userId, expiresAt: Date.now() + BOT_USER_CACHE_TTL_MS });
+  return userId;
+}
+
+export async function editMessage(params: EditMessageParams): Promise<EditMessageResult> {
+  const resolved = resolveMattermostAccount({ cfg: params.cfg, accountId: params.accountId });
+  const baseUrl = resolved.baseUrl?.trim();
+  const botToken = resolved.botToken?.trim();
+
+  if (!baseUrl || !botToken) {
+    return { ok: false, error: "Mattermost botToken/baseUrl missing." };
+  }
+
+  const client = createMattermostClient({
+    baseUrl,
+    botToken,
+    fetchImpl: params.fetchImpl,
+    allowPrivateNetwork: resolved.config?.allowPrivateNetwork === true,
+  });
+
+  const cacheKey = `${baseUrl}:${botToken}`;
+  const botUserId = await resolveBotUserId(client, cacheKey);
+  if (!botUserId) {
+    return { ok: false, error: "Mattermost edit failed: could not resolve bot user id." };
+  }
+
+  if (!params.postId?.trim()) {
+    return { ok: false, error: "Mattermost edit requires postId" };
+  }
+  if (!params.channelId?.trim()) {
+    return { ok: false, error: "Mattermost edit requires channelId" };
+  }
+  if (!params.message?.trim() && !params.props) {
+    return { ok: false, error: "Mattermost edit requires message or props" };
+  }
+
+  try {
+    const existingPost = await client.request<{
+      id: string;
+      user_id: string;
+      channel_id: string;
+      type?: string;
+    }>(`/posts/${params.postId}`);
+
+    if (existingPost.user_id !== botUserId) {
+      return {
+        ok: false,
+        error: "Permission denied: cannot edit messages from other users",
+        errorCode: "PERMISSION_DENIED",
+      };
+    }
+
+    if (existingPost.type && existingPost.type !== "") {
+      return {
+        ok: false,
+        error: "Cannot edit system messages",
+        errorCode: "SYSTEM_MESSAGE",
+      };
+    }
+
+    const updatePayload: Record<string, unknown> = {
+      id: params.postId,
+      channel_id: params.channelId,
+    };
+
+    if (params.message?.trim()) {
+      updatePayload.message = params.message.trim();
+    }
+
+    if (params.props) {
+      updatePayload.props = params.props;
+    }
+
+    const updatedPost = await client.request<{
+      id: string;
+      channel_id: string;
+    }>(`/posts/${params.postId}`, {
+      method: "PUT",
+      body: JSON.stringify(updatePayload),
+    });
+
+    return {
+      ok: true,
+      postId: updatedPost.id,
+      channelId: updatedPost.channel_id,
+    };
+  } catch (err) {
+    const errorMessage = String(err);
+
+    if (errorMessage.includes("403") || errorMessage.includes("permission")) {
+      return {
+        ok: false,
+        error: "Permission denied: insufficient permissions to edit this message",
+        errorCode: "PERMISSION_DENIED",
+      };
+    }
+
+    if (errorMessage.includes("404") || errorMessage.includes("not found")) {
+      return {
+        ok: false,
+        error: "Post not found: the message may have been deleted",
+        errorCode: "POST_NOT_FOUND",
+      };
+    }
+
+    if (errorMessage.includes("429") || errorMessage.includes("rate limit")) {
+      return {
+        ok: false,
+        error: "Rate limited: too many edit requests, please try again later",
+        errorCode: "RATE_LIMITED",
+      };
+    }
+
+    if (errorMessage.includes("401") || errorMessage.includes("unauthorized")) {
+      return {
+        ok: false,
+        error: "Authentication failed: invalid or expired token",
+        errorCode: "AUTH_FAILED",
+      };
+    }
+
+    return {
+      ok: false,
+      error: `Mattermost edit failed: ${errorMessage}`,
+      errorCode: "UNKNOWN_ERROR",
+    };
+  }
+}
+
+export function resetMattermostEditBotUserCacheForTests(): void {
+  botUserIdCache.clear();
+}
+
+type DeleteMessageResult = { ok: true } | { ok: false; error: string };
+
+export type DeleteMessageParams = {
+  cfg: OpenClawConfig;
+  postId: string;
+  channelId?: string;
+  accountId?: string | null;
+  fetchImpl?: MattermostFetch;
+};
+
+export async function deleteMessage(params: DeleteMessageParams): Promise<DeleteMessageResult> {
+  const resolved = resolveMattermostAccount({ cfg: params.cfg, accountId: params.accountId });
+  const baseUrl = resolved.baseUrl?.trim();
+  const botToken = resolved.botToken?.trim();
+
+  if (!baseUrl || !botToken) {
+    return { ok: false, error: "Mattermost botToken/baseUrl missing." };
+  }
+
+  const client = createMattermostClient({
+    baseUrl,
+    botToken,
+    fetchImpl: params.fetchImpl,
+    allowPrivateNetwork: resolved.config?.allowPrivateNetwork === true,
+  });
+
+  return deleteMattermostPost(client, params.postId);
+}
+
+async function deleteMattermostPost(
+  client: MattermostClient,
+  postId: string,
+): Promise<DeleteMessageResult> {
+  try {
+    await client.request<unknown>(`/posts/${encodeURIComponent(postId)}`, {
+      method: "DELETE",
+    });
+    return { ok: true };
+  } catch (err) {
+    const errorMessage = String(err).toLowerCase();
+
+    const isNotFound =
+      errorMessage.includes("404") ||
+      errorMessage.includes("not found") ||
+      errorMessage.includes("message not found") ||
+      errorMessage.includes("post not found") ||
+      errorMessage.includes("no such post");
+
+    if (isNotFound) {
+      return { ok: true };
+    }
+
+    const isPermissionDenied =
+      errorMessage.includes("403") ||
+      errorMessage.includes("permission denied") ||
+      errorMessage.includes("unauthorized") ||
+      errorMessage.includes("access denied") ||
+      errorMessage.includes("forbidden");
+
+    if (isPermissionDenied) {
+      return { ok: false, error: `Permission denied: unable to delete message ${postId}` };
+    }
+
+    const isSystemMessage =
+      errorMessage.includes("system message") ||
+      errorMessage.includes("cannot delete system message");
+
+    if (isSystemMessage) {
+      return { ok: false, error: `Cannot delete system message ${postId}` };
+    }
+
+    return { ok: false, error: `Failed to delete message ${postId}: ${String(err)}` };
+  }
+}
+
+export type DownloadFileResult =
+  | { ok: true; filePath: string; fileId: string; metadata: FileMetadata }
+  | { ok: false; error: string; errorCode?: string };
+
+export type FileMetadata = {
+  id: string;
+  name: string;
+  mimeType: string;
+  size: number;
+  extension: string;
+};
+
+export type DownloadFileParams = {
+  cfg: OpenClawConfig;
+  fileId: string;
+  destinationPath: string;
+  maxSize?: number;
+  accountId?: string | null;
+  fetchImpl?: MattermostFetch;
+  /** Optional custom allowed MIME type prefixes */
+  allowedMimePrefixes?: string[];
+};
+
+/**
+ * Downloads a file from Mattermost with security validations.
+ * Uses PAT for authentication.
+ * Security: Validates file type against allowlist, blocks executables, checks size before download.
+ * Streams download to avoid memory issues.
+ *
+ * Mattermost API: GET /api/v4/files/{file_id}
+ */
+export async function downloadFile(params: DownloadFileParams): Promise<DownloadFileResult> {
+  const resolved = resolveMattermostAccount({ cfg: params.cfg, accountId: params.accountId });
+  const baseUrl = resolved.baseUrl?.trim();
+  const botToken = resolved.botToken?.trim();
+
+  if (!baseUrl || !botToken) {
+    return { ok: false, error: "Mattermost botToken/baseUrl missing.", errorCode: "CONFIG_ERROR" };
+  }
+
+  if (!params.fileId?.trim()) {
+    return { ok: false, error: "File ID is required", errorCode: "INVALID_PARAMS" };
+  }
+
+  if (!params.destinationPath?.trim()) {
+    return { ok: false, error: "Destination path is required", errorCode: "INVALID_PARAMS" };
+  }
+
+  const maxSize = params.maxSize ?? DEFAULT_MAX_FILE_SIZE;
+  const fileId = params.fileId.trim();
+  const destinationPath = params.destinationPath.trim();
+
+  const client = createMattermostClient({
+    baseUrl,
+    botToken,
+    fetchImpl: params.fetchImpl,
+    allowPrivateNetwork: resolved.config?.allowPrivateNetwork === true,
+  });
+
+  try {
+    const fileInfo = await client.request<{
+      id: string;
+      name?: string | null;
+      mime_type?: string | null;
+      size?: number | null;
+    }>(`/files/${fileId}/info`);
+
+    const fileName = fileInfo.name?.trim() || "unknown";
+    const mimeType = fileInfo.mime_type?.trim() || "application/octet-stream";
+    const fileSize = fileInfo.size ?? 0;
+    const extension = extname(fileName).toLowerCase();
+
+    if (fileSize > maxSize) {
+      return {
+        ok: false,
+        error: `File size (${fileSize} bytes) exceeds maximum allowed (${maxSize} bytes)`,
+        errorCode: "FILE_TOO_LARGE",
+      };
+    }
+
+    if (fileSize <= 0) {
+      return {
+        ok: false,
+        error: "Invalid file size: file is empty",
+        errorCode: "EMPTY_FILE",
+      };
+    }
+
+    if (BLOCKED_EXTENSIONS.has(extension)) {
+      return {
+        ok: false,
+        error: `Executable file type not allowed: ${extension}`,
+        errorCode: "BLOCKED_FILE_TYPE",
+      };
+    }
+
+    const allowedPrefixes = params.allowedMimePrefixes ?? ALLOWED_MIME_PREFIXES;
+    const isMimeTypeAllowed = allowedPrefixes.some((prefix) => mimeType.toLowerCase().startsWith(prefix.toLowerCase()));
+    if (!isMimeTypeAllowed) {
+      return {
+        ok: false,
+        error: `File MIME type not allowed: ${mimeType}`,
+        errorCode: "BLOCKED_MIME_TYPE",
+      };
+    }
+
+    const dir = dirname(destinationPath);
+    await mkdir(dir, { recursive: true });
+
+    const downloadUrl = `${client.apiBaseUrl}/files/${fileId}`;
+    const res = await client.fetchImpl(downloadUrl, {
+      method: "GET",
+      headers: {
+        Authorization: `Bearer ${botToken}`,
+      },
+    });
+
+    if (!res.ok) {
+      const detail = await readMattermostError(res);
+      return {
+        ok: false,
+        error: `Download failed: ${res.status} ${res.statusText} - ${detail}`,
+        errorCode: "DOWNLOAD_FAILED",
+      };
+    }
+
+    const contentLength = res.headers.get("content-length");
+    if (contentLength) {
+      const actualSize = parseInt(contentLength, 10);
+      if (actualSize > maxSize) {
+        return {
+          ok: false,
+          error: `File size (${actualSize} bytes) exceeds maximum allowed (${maxSize} bytes)`,
+          errorCode: "FILE_TOO_LARGE",
+        };
+      }
+    }
+
+    const fileStream = createWriteStream(destinationPath);
+    const body = res.body;
+    if (!body) {
+      return {
+        ok: false,
+        error: "Download failed: no response body",
+        errorCode: "DOWNLOAD_FAILED",
+      };
+    }
+
+    const reader = body.getReader();
+    let downloadedSize = 0;
+
+    try {
+      while (true) {
+        const { done, value } = await reader.read();
+        if (done) break;
+
+        downloadedSize += value.length;
+        if (downloadedSize > maxSize) {
+          fileStream.destroy();
+          await unlink(destinationPath).catch(() => undefined);
+          return {
+            ok: false,
+            error: `Downloaded file size exceeds maximum allowed (${maxSize} bytes)`,
+            errorCode: "FILE_TOO_LARGE",
+          };
+        }
+
+        fileStream.write(Buffer.from(value));
+      }
+
+      fileStream.end();
+      await new Promise<void>((resolve, reject) => {
+        fileStream.on("finish", resolve);
+        fileStream.on("error", reject);
+      });
+    } catch (streamErr) {
+      fileStream.destroy();
+      await unlink(destinationPath).catch(() => undefined);
+      throw streamErr;
+    }
+
+    const metadata: FileMetadata = {
+      id: fileId,
+      name: fileName,
+      mimeType,
+      size: downloadedSize,
+      extension,
+    };
+
+    return {
+      ok: true,
+      filePath: destinationPath,
+      fileId,
+      metadata,
+    };
+  } catch (err) {
+    const errorMessage = String(err);
+
+    if (errorMessage.includes("404") || errorMessage.includes("not found")) {
+      return {
+        ok: false,
+        error: "File not found",
+        errorCode: "FILE_NOT_FOUND",
+      };
+    }
+
+    if (errorMessage.includes("403") || errorMessage.includes("permission")) {
+      return {
+        ok: false,
+        error: "Permission denied: insufficient permissions to download this file",
+        errorCode: "PERMISSION_DENIED",
+      };
+    }
+
+    if (errorMessage.includes("401") || errorMessage.includes("unauthorized")) {
+      return {
+        ok: false,
+        error: "Authentication failed: invalid or expired token",
+        errorCode: "AUTH_FAILED",
+      };
+    }
+
+    return {
+      ok: false,
+      error: `Download failed: ${errorMessage}`,
+      errorCode: "DOWNLOAD_FAILED",
+    };
+  }
+}
+
+async function readMattermostError(res: Response): Promise<string> {
+  const contentType = res.headers.get("content-type") ?? "";
+  if (contentType.includes("application/json")) {
+    const data = (await res.json()) as { message?: string } | undefined;
+    if (data?.message) {
+      return data.message;
+    }
+    return JSON.stringify(data);
+  }
+  return await res.text();
+}

extensions/mattermost/src/mattermost/client.retry.test.ts

@@ -0,0 +1,512 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { createMattermostClient, createMattermostDirectChannelWithRetry } from "./client.js";
+
+describe("createMattermostDirectChannelWithRetry", () => {
+  const mockFetch = vi.fn<typeof fetch>();
+
+  beforeEach(() => {
+    vi.restoreAllMocks();
+    vi.clearAllMocks();
+    vi.useFakeTimers();
+  });
+
+  afterEach(async () => {
+    await vi.runOnlyPendingTimersAsync();
+    vi.useRealTimers();
+    vi.restoreAllMocks();
+  });
+
+  function createMockClient() {
+    return createMattermostClient({
+      baseUrl: "https://mattermost.example.com",
+      // pragma: allowlist secret
+      botToken: "test-token",
+      fetchImpl: mockFetch,
+    });
+  }
+
+  function createFetchFailedError(params: { message: string; code?: string }): TypeError {
+    const cause = Object.assign(new Error(params.message), {
+      code: params.code,
+    });
+    return Object.assign(new TypeError("fetch failed"), { cause });
+  }
+
+  async function resolveRetryRun<T>(run: Promise<T>): Promise<T> {
+    await vi.runAllTimersAsync();
+    return await run;
+  }
+
+  function suppressUnhandled<T>(run: Promise<T>): Promise<T> {
+    run.catch(() => {});
+    return run;
+  }
+
+  it("succeeds on first attempt without retries", async () => {
+    mockFetch.mockResolvedValueOnce({
+      ok: true,
+      status: 201,
+      headers: new Headers({ "content-type": "application/json" }),
+      json: async () => ({ id: "dm-channel-123" }),
+    } as Response);
+
+    const client = createMockClient();
+    const onRetry = vi.fn();
+
+    const result = await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        onRetry,
+      }),
+    );
+
+    expect(result.id).toBe("dm-channel-123");
+    expect(mockFetch).toHaveBeenCalledTimes(1);
+    expect(onRetry).not.toHaveBeenCalled();
+  });
+
+  it("retries on 429 rate limit error and succeeds", async () => {
+    mockFetch
+      .mockResolvedValueOnce({
+        ok: false,
+        status: 429,
+        headers: new Headers({ "content-type": "application/json" }),
+        json: async () => ({ message: "Too many requests" }),
+        text: async () => "Too many requests",
+      } as Response)
+      .mockResolvedValueOnce({
+        ok: true,
+        status: 201,
+        headers: new Headers({ "content-type": "application/json" }),
+        json: async () => ({ id: "dm-channel-456" }),
+      } as Response);
+
+    const client = createMockClient();
+    const onRetry = vi.fn();
+
+    const result = await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+        onRetry,
+      }),
+    );
+
+    expect(result.id).toBe("dm-channel-456");
+    expect(mockFetch).toHaveBeenCalledTimes(2);
+    expect(onRetry).toHaveBeenCalledTimes(1);
+    expect(onRetry).toHaveBeenCalledWith(
+      1,
+      expect.any(Number),
+      expect.objectContaining({ message: expect.stringContaining("429") }),
+    );
+  });
+
+  it("retries on port 443 connection errors (not misclassified as 4xx)", async () => {
+    // This tests that port numbers like :443 don't trigger false 4xx classification
+    mockFetch
+      .mockRejectedValueOnce(new Error("connect ECONNRESET 104.18.32.10:443"))
+      .mockResolvedValueOnce({
+        ok: true,
+        status: 201,
+        headers: new Headers({ "content-type": "application/json" }),
+        json: async () => ({ id: "dm-channel-port" }),
+      } as Response);
+
+    const client = createMockClient();
+
+    const result = await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+
+    // Should retry and succeed on second attempt (port 443 should NOT be treated as 4xx)
+    expect(mockFetch).toHaveBeenCalledTimes(2);
+    expect(result.id).toBe("dm-channel-port");
+  });
+
+  it("does not retry on 400 even if error message contains '429' text", async () => {
+    // This tests that "429" in error detail doesn't trigger false rate-limit retry
+    // e.g., "Invalid user ID: 4294967295" should NOT be retried
+    mockFetch.mockResolvedValueOnce({
+      ok: false,
+      status: 400,
+      headers: new Headers({ "content-type": "application/json" }),
+      json: async () => ({ message: "Invalid user ID: 4294967295" }),
+      text: async () => "Invalid user ID: 4294967295",
+    } as Response);
+
+    const client = createMockClient();
+
+    const run = suppressUnhandled(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+    await expect(resolveRetryRun(run)).rejects.toThrow();
+
+    // Should not retry - only called once (400 is a client error, even though message contains "429")
+    expect(mockFetch).toHaveBeenCalledTimes(1);
+  });
+
+  it("retries on 5xx server errors", async () => {
+    mockFetch
+      .mockResolvedValueOnce({
+        ok: false,
+        status: 503,
+        headers: new Headers({ "content-type": "application/json" }),
+        json: async () => ({ message: "Service unavailable" }),
+        text: async () => "Service unavailable",
+      } as Response)
+      .mockResolvedValueOnce({
+        ok: false,
+        status: 502,
+        headers: new Headers({ "content-type": "application/json" }),
+        json: async () => ({ message: "Bad gateway" }),
+        text: async () => "Bad gateway",
+      } as Response)
+      .mockResolvedValueOnce({
+        ok: true,
+        status: 201,
+        headers: new Headers({ "content-type": "application/json" }),
+        json: async () => ({ id: "dm-channel-789" }),
+      } as Response);
+
+    const client = createMockClient();
+
+    const result = await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+
+    expect(result.id).toBe("dm-channel-789");
+    expect(mockFetch).toHaveBeenCalledTimes(3);
+  });
+
+  it("retries on network errors", async () => {
+    mockFetch
+      .mockRejectedValueOnce(new Error("Network error: connection refused"))
+      .mockRejectedValueOnce(new Error("ECONNRESET"))
+      .mockResolvedValueOnce({
+        ok: true,
+        status: 201,
+        headers: new Headers({ "content-type": "application/json" }),
+        json: async () => ({ id: "dm-channel-abc" }),
+      } as Response);
+
+    const client = createMockClient();
+
+    const result = await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+
+    expect(result.id).toBe("dm-channel-abc");
+    expect(mockFetch).toHaveBeenCalledTimes(3);
+  });
+
+  it("retries on fetch failed errors when the cause carries a transient code", async () => {
+    mockFetch
+      .mockRejectedValueOnce(
+        createFetchFailedError({
+          message: "connect ECONNREFUSED 127.0.0.1:81",
+          code: "ECONNREFUSED",
+        }),
+      )
+      .mockResolvedValueOnce({
+        ok: true,
+        status: 201,
+        headers: new Headers({ "content-type": "application/json" }),
+        json: async () => ({ id: "dm-channel-fetch-failed" }),
+      } as Response);
+
+    const client = createMockClient();
+
+    const result = await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+
+    expect(result.id).toBe("dm-channel-fetch-failed");
+    expect(mockFetch).toHaveBeenCalledTimes(2);
+  });
+
+  it("does not retry on 4xx client errors (except 429)", async () => {
+    mockFetch.mockResolvedValueOnce({
+      ok: false,
+      status: 400,
+      headers: new Headers({ "content-type": "application/json" }),
+      json: async () => ({ message: "Bad request" }),
+      text: async () => "Bad request",
+    } as Response);
+
+    const client = createMockClient();
+
+    const run = suppressUnhandled(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+    await expect(resolveRetryRun(run)).rejects.toThrow("400");
+
+    expect(mockFetch).toHaveBeenCalledTimes(1);
+  });
+
+  it("does not retry on 404 not found", async () => {
+    mockFetch.mockResolvedValueOnce({
+      ok: false,
+      status: 404,
+      headers: new Headers({ "content-type": "application/json" }),
+      json: async () => ({ message: "User not found" }),
+      text: async () => "User not found",
+    } as Response);
+
+    const client = createMockClient();
+
+    const run = suppressUnhandled(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+    await expect(resolveRetryRun(run)).rejects.toThrow("404");
+
+    expect(mockFetch).toHaveBeenCalledTimes(1);
+  });
+
+  it("throws after exhausting all retries", async () => {
+    mockFetch.mockResolvedValue({
+      ok: false,
+      status: 503,
+      headers: new Headers({ "content-type": "application/json" }),
+      json: async () => ({ message: "Service unavailable" }),
+      text: async () => "Service unavailable",
+    } as Response);
+
+    const client = createMockClient();
+
+    const run = suppressUnhandled(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 2,
+        initialDelayMs: 10,
+      }),
+    );
+    await expect(resolveRetryRun(run)).rejects.toThrow();
+
+    expect(mockFetch).toHaveBeenCalledTimes(3); // initial + 2 retries
+  });
+
+  it("respects custom timeout option and aborts fetch", async () => {
+    let abortSignal: AbortSignal | undefined;
+    let abortListenerCalled = false;
+
+    mockFetch.mockImplementationOnce((url, init) => {
+      abortSignal = init?.signal ?? undefined;
+      if (abortSignal) {
+        abortSignal.addEventListener("abort", () => {
+          abortListenerCalled = true;
+        });
+      }
+      // Return a promise that rejects when aborted, otherwise never resolves
+      return new Promise((_, reject) => {
+        if (abortSignal) {
+          const checkAbort = () => {
+            if (abortSignal?.aborted) {
+              reject(new Error("AbortError"));
+            } else {
+              setTimeout(checkAbort, 10);
+            }
+          };
+          setTimeout(checkAbort, 10);
+        }
+      });
+    });
+
+    const client = createMockClient();
+
+    const run = suppressUnhandled(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        timeoutMs: 50,
+        maxRetries: 0,
+        initialDelayMs: 10,
+      }),
+    );
+    await expect(resolveRetryRun(run)).rejects.toThrow();
+
+    expect(mockFetch).toHaveBeenCalledTimes(1);
+    expect(abortSignal).toBeDefined();
+    expect(abortListenerCalled).toBe(true);
+  });
+
+  it("uses exponential backoff with jitter between retries", async () => {
+    const delays: number[] = [];
+    mockFetch
+      .mockRejectedValueOnce(new Error("Mattermost API 503 Service Unavailable"))
+      .mockRejectedValueOnce(new Error("Mattermost API 503 Service Unavailable"))
+      .mockResolvedValueOnce({
+        ok: true,
+        status: 201,
+        headers: new Headers({ "content-type": "application/json" }),
+        json: async () => ({ id: "dm-channel-delay" }),
+      } as Response);
+
+    const client = createMockClient();
+
+    await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 100,
+        maxDelayMs: 1000,
+        onRetry: (attempt, delayMs) => {
+          delays.push(delayMs);
+        },
+      }),
+    );
+
+    expect(delays).toHaveLength(2);
+    // First retry: exponentialDelay = 100ms, jitter = 0-100ms, total = 100-200ms
+    expect(delays[0]).toBeGreaterThanOrEqual(100);
+    expect(delays[0]).toBeLessThanOrEqual(200);
+    // Second retry: exponentialDelay = 200ms, jitter = 0-200ms, total = 200-400ms
+    expect(delays[1]).toBeGreaterThanOrEqual(200);
+    expect(delays[1]).toBeLessThanOrEqual(400);
+  });
+
+  it("respects maxDelayMs cap", async () => {
+    const delays: number[] = [];
+    mockFetch
+      .mockRejectedValueOnce(new Error("Mattermost API 503"))
+      .mockRejectedValueOnce(new Error("Mattermost API 503"))
+      .mockRejectedValueOnce(new Error("Mattermost API 503"))
+      .mockRejectedValueOnce(new Error("Mattermost API 503"))
+      .mockResolvedValueOnce({
+        ok: true,
+        status: 201,
+        headers: new Headers({ "content-type": "application/json" }),
+        json: async () => ({ id: "dm-channel-max" }),
+      } as Response);
+
+    const client = createMockClient();
+
+    await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 4,
+        initialDelayMs: 1000,
+        maxDelayMs: 2500,
+        onRetry: (attempt, delayMs) => {
+          delays.push(delayMs);
+        },
+      }),
+    );
+
+    expect(delays).toHaveLength(4);
+    // All delays should be capped at maxDelayMs
+    delays.forEach((delay) => {
+      expect(delay).toBeLessThanOrEqual(2500);
+    });
+  });
+
+  it("does not retry on 4xx errors even if message contains retryable keywords", async () => {
+    // This tests the fix for false positives where a 400 error with "timeout" in the message
+    // would incorrectly be retried
+    mockFetch.mockResolvedValueOnce({
+      ok: false,
+      status: 400,
+      headers: new Headers({ "content-type": "application/json" }),
+      json: async () => ({ message: "Request timeout: connection timed out" }),
+      text: async () => "Request timeout: connection timed out",
+    } as Response);
+
+    const client = createMockClient();
+
+    const run = suppressUnhandled(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+    await expect(resolveRetryRun(run)).rejects.toThrow("400");
+
+    // Should not retry - only called once
+    expect(mockFetch).toHaveBeenCalledTimes(1);
+  });
+
+  it("does not retry on 403 Forbidden even with 'abort' in message", async () => {
+    mockFetch.mockResolvedValueOnce({
+      ok: false,
+      status: 403,
+      headers: new Headers({ "content-type": "application/json" }),
+      json: async () => ({ message: "Request aborted: forbidden" }),
+      text: async () => "Request aborted: forbidden",
+    } as Response);
+
+    const client = createMockClient();
+
+    const run = suppressUnhandled(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+    await expect(resolveRetryRun(run)).rejects.toThrow("403");
+
+    expect(mockFetch).toHaveBeenCalledTimes(1);
+  });
+
+  it("passes AbortSignal to fetch for timeout support", async () => {
+    let capturedSignal: AbortSignal | undefined;
+    mockFetch.mockImplementationOnce((url, init) => {
+      capturedSignal = init?.signal ?? undefined;
+      return Promise.resolve({
+        ok: true,
+        status: 201,
+        headers: new Headers({ "content-type": "application/json" }),
+        json: async () => ({ id: "dm-channel-signal" }),
+      } as Response);
+    });
+
+    const client = createMockClient();
+    await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        timeoutMs: 5000,
+      }),
+    );
+
+    expect(capturedSignal).toBeDefined();
+    expect(capturedSignal).toBeInstanceOf(AbortSignal);
+  });
+
+  it("retries on 5xx even if error message contains 4xx substring", async () => {
+    // This tests the fix for the ordering bug: 503 with "upstream 404" should be retried
+    mockFetch
+      .mockRejectedValueOnce(new Error("Mattermost API 503: upstream returned 404 Not Found"))
+      .mockResolvedValueOnce({
+        ok: true,
+        status: 201,
+        headers: new Headers({ "content-type": "application/json" }),
+        json: async () => ({ id: "dm-channel-5xx-with-404" }),
+      } as Response);
+
+    const client = createMockClient();
+
+    const result = await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+
+    // Should retry and succeed on second attempt
+    expect(mockFetch).toHaveBeenCalledTimes(2);
+    expect(result.id).toBe("dm-channel-5xx-with-404");
+  });
+});

extensions/mattermost/src/mattermost/client.test.ts

@@ -0,0 +1,291 @@
+import { describe, expect, it, vi } from "vitest";
+import {
+  createMattermostClient,
+  createMattermostPost,
+  normalizeMattermostBaseUrl,
+  updateMattermostPost,
+} from "./client.js";
+
+// ── Helper: mock fetch that captures requests ────────────────────────
+
+function createMockFetch(response?: { status?: number; body?: unknown; contentType?: string }) {
+  const status = response?.status ?? 200;
+  const body = response?.body ?? {};
+  const contentType = response?.contentType ?? "application/json";
+
+  const calls: Array<{ url: string; init?: RequestInit }> = [];
+
+  const mockFetch = vi.fn(async (url: string | URL | Request, init?: RequestInit) => {
+    const urlStr = typeof url === "string" ? url : url.toString();
+    calls.push({ url: urlStr, init });
+    return new Response(JSON.stringify(body), {
+      status,
+      headers: { "content-type": contentType },
+    });
+  });
+
+  return { mockFetch: mockFetch as typeof fetch, calls };
+}
+
+function createTestClient(response?: { status?: number; body?: unknown; contentType?: string }) {
+  const { mockFetch, calls } = createMockFetch(response);
+  const client = createMattermostClient({
+    baseUrl: "http://localhost:8065",
+    botToken: "tok",
+    fetchImpl: mockFetch,
+  });
+  return { client, calls };
+}
+
+async function updatePostAndCapture(
+  update: Parameters<typeof updateMattermostPost>[2],
+  response?: { status?: number; body?: unknown; contentType?: string },
+) {
+  const { client, calls } = createTestClient(response ?? { body: { id: "post1" } });
+  await updateMattermostPost(client, "post1", update);
+  return {
+    calls,
+    body: JSON.parse(calls[0].init?.body as string) as Record<string, unknown>,
+  };
+}
+
+// ── normalizeMattermostBaseUrl ────────────────────────────────────────
+
+describe("normalizeMattermostBaseUrl", () => {
+  it("strips trailing slashes", () => {
+    expect(normalizeMattermostBaseUrl("http://localhost:8065/")).toBe("http://localhost:8065");
+  });
+
+  it("strips /api/v4 suffix", () => {
+    expect(normalizeMattermostBaseUrl("http://localhost:8065/api/v4")).toBe(
+      "http://localhost:8065",
+    );
+  });
+
+  it("returns undefined for empty input", () => {
+    expect(normalizeMattermostBaseUrl("")).toBeUndefined();
+    expect(normalizeMattermostBaseUrl(null)).toBeUndefined();
+    expect(normalizeMattermostBaseUrl(undefined)).toBeUndefined();
+  });
+
+  it("preserves valid base URL", () => {
+    expect(normalizeMattermostBaseUrl("http://mm.example.com")).toBe("http://mm.example.com");
+  });
+});
+
+// ── createMattermostClient ───────────────────────────────────────────
+
+describe("createMattermostClient", () => {
+  it("creates a client with normalized baseUrl", () => {
+    const { mockFetch } = createMockFetch();
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065/",
+      botToken: "tok",
+      fetchImpl: mockFetch,
+    });
+    expect(client.baseUrl).toBe("http://localhost:8065");
+    expect(client.apiBaseUrl).toBe("http://localhost:8065/api/v4");
+  });
+
+  it("throws on empty baseUrl", () => {
+    expect(() => createMattermostClient({ baseUrl: "", botToken: "tok" })).toThrow(
+      "baseUrl is required",
+    );
+  });
+
+  it("sends Authorization header with Bearer token", async () => {
+    const { mockFetch, calls } = createMockFetch({ body: { id: "u1" } });
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065",
+      botToken: "my-secret-token",
+      fetchImpl: mockFetch,
+    });
+    await client.request("/users/me");
+    const headers = new Headers(calls[0].init?.headers);
+    expect(headers.get("Authorization")).toBe("Bearer my-secret-token");
+  });
+
+  it("sets Content-Type for string bodies", async () => {
+    const { mockFetch, calls } = createMockFetch({ body: { id: "p1" } });
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065",
+      botToken: "tok",
+      fetchImpl: mockFetch,
+    });
+    await client.request("/posts", { method: "POST", body: JSON.stringify({ message: "hi" }) });
+    const headers = new Headers(calls[0].init?.headers);
+    expect(headers.get("Content-Type")).toBe("application/json");
+  });
+
+  it("throws on non-ok responses", async () => {
+    const { mockFetch } = createMockFetch({
+      status: 404,
+      body: { message: "Not Found" },
+    });
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065",
+      botToken: "tok",
+      fetchImpl: mockFetch,
+    });
+    await expect(client.request("/missing")).rejects.toThrow("Mattermost API 404");
+  });
+
+  it("returns undefined on 204 responses", async () => {
+    const fetchImpl = vi.fn<typeof fetch>(async () => {
+      return new Response(null, { status: 204 });
+    });
+    const client = createMattermostClient({
+      baseUrl: "https://chat.example.com",
+      // pragma: allowlist secret
+      botToken: "test-token",
+      fetchImpl,
+    });
+    const result = await client.request<unknown>("/anything", { method: "DELETE" });
+    expect(result).toBeUndefined();
+  });
+});
+
+// ── createMattermostPost ─────────────────────────────────────────────
+
+describe("createMattermostPost", () => {
+  it("sends channel_id and message", async () => {
+    const { mockFetch, calls } = createMockFetch({ body: { id: "post1" } });
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065",
+      botToken: "tok",
+      fetchImpl: mockFetch,
+    });
+
+    await createMattermostPost(client, {
+      channelId: "ch123",
+      message: "Hello world",
+    });
+
+    const body = JSON.parse(calls[0].init?.body as string);
+    expect(body.channel_id).toBe("ch123");
+    expect(body.message).toBe("Hello world");
+  });
+
+  it("includes rootId when provided", async () => {
+    const { mockFetch, calls } = createMockFetch({ body: { id: "post2" } });
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065",
+      botToken: "tok",
+      fetchImpl: mockFetch,
+    });
+
+    await createMattermostPost(client, {
+      channelId: "ch123",
+      message: "Reply",
+      rootId: "root456",
+    });
+
+    const body = JSON.parse(calls[0].init?.body as string);
+    expect(body.root_id).toBe("root456");
+  });
+
+  it("includes fileIds when provided", async () => {
+    const { mockFetch, calls } = createMockFetch({ body: { id: "post3" } });
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065",
+      botToken: "tok",
+      fetchImpl: mockFetch,
+    });
+
+    await createMattermostPost(client, {
+      channelId: "ch123",
+      message: "With file",
+      fileIds: ["file1", "file2"],
+    });
+
+    const body = JSON.parse(calls[0].init?.body as string);
+    expect(body.file_ids).toEqual(["file1", "file2"]);
+  });
+
+  it("includes props when provided (for interactive buttons)", async () => {
+    const { mockFetch, calls } = createMockFetch({ body: { id: "post4" } });
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065",
+      botToken: "tok",
+      fetchImpl: mockFetch,
+    });
+
+    const props = {
+      attachments: [
+        {
+          text: "Choose:",
+          actions: [{ id: "btn1", type: "button", name: "Click" }],
+        },
+      ],
+    };
+
+    await createMattermostPost(client, {
+      channelId: "ch123",
+      message: "Pick an option",
+      props,
+    });
+
+    const body = JSON.parse(calls[0].init?.body as string);
+    expect(body.props).toEqual(props);
+    expect(body.props.attachments[0].actions[0].type).toBe("button");
+  });
+
+  it("omits props when not provided", async () => {
+    const { mockFetch, calls } = createMockFetch({ body: { id: "post5" } });
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065",
+      botToken: "tok",
+      fetchImpl: mockFetch,
+    });
+
+    await createMattermostPost(client, {
+      channelId: "ch123",
+      message: "No props",
+    });
+
+    const body = JSON.parse(calls[0].init?.body as string);
+    expect(body.props).toBeUndefined();
+  });
+});
+
+// ── updateMattermostPost ─────────────────────────────────────────────
+
+describe("updateMattermostPost", () => {
+  it("sends PUT to /posts/{id}", async () => {
+    const { calls } = await updatePostAndCapture({ message: "Updated" });
+
+    expect(calls[0].url).toContain("/posts/post1");
+    expect(calls[0].init?.method).toBe("PUT");
+  });
+
+  it("includes post id in the body", async () => {
+    const { body } = await updatePostAndCapture({ message: "Updated" });
+    expect(body.id).toBe("post1");
+    expect(body.message).toBe("Updated");
+  });
+
+  it("includes props for button completion updates", async () => {
+    const { body } = await updatePostAndCapture({
+      message: "Original message",
+      props: {
+        attachments: [{ text: "✓ **do_now** selected by @tony" }],
+      },
+    });
+    expect(body.message).toBe("Original message");
+    expect(body.props).toMatchObject({
+      attachments: [{ text: expect.stringContaining("✓") }],
+    });
+    expect(body.props).toMatchObject({
+      attachments: [{ text: expect.stringContaining("do_now") }],
+    });
+  });
+
+  it("omits message when not provided", async () => {
+    const { body } = await updatePostAndCapture({
+      props: { attachments: [] },
+    });
+    expect(body.id).toBe("post1");
+    expect(body.message).toBeUndefined();
+    expect(body.props).toEqual({ attachments: [] });
+  });
+});

extensions/mattermost/src/mattermost/client.ts

@@ -0,0 +1,496 @@
+import { fetchWithSsrFGuard } from "openclaw/plugin-sdk/ssrf-runtime";
+import { z } from "openclaw/plugin-sdk/zod";
+import {
+  MattermostError,
+  MattermostAPIError,
+  AuthenticationError,
+  ValidationError,
+  PermissionError,
+  RateLimitError,
+  ResourceNotFoundError,
+  NetworkError,
+  TimeoutError,
+  ConfigurationError,
+  MissingBotTokenError,
+  MissingBaseUrlError,
+  createErrorFromResponse,
+  createErrorContext,
+  withRetry,
+  isRetryableError,
+  getRetryAfterMs,
+  globalErrorBoundary,
+  getUserFriendlyMessage,
+  ErrorCodes,
+  type ErrorContext,
+  type RetryConfig,
+} from "../errors.js";
+
+export type MattermostFetch = (input: RequestInfo | URL, init?: RequestInit) => Promise<Response>;
+
+export type MattermostClient = {
+  baseUrl: string;
+  apiBaseUrl: string;
+  token: string;
+  request: <T>(path: string, init?: RequestInit, operation?: string) => Promise<T>;
+  /** Guarded fetch implementation; use in place of raw fetch for outbound requests. */
+  fetchImpl: MattermostFetch;
+  /**
+   * Get the appropriate token for an operation.
+   * - 'read' operations use botToken
+   * - 'write' operations use PAT if available, otherwise botToken
+   */
+  getTokenForOperation: (operation: "read" | "write") => string;
+};
+
+export type MattermostUser = {
+  id: string;
+  username?: string | null;
+  nickname?: string | null;
+  first_name?: string | null;
+  last_name?: string | null;
+  update_at?: number;
+};
+
+export type MattermostChannel = {
+  id: string;
+  name?: string | null;
+  display_name?: string | null;
+  type?: string | null;
+  team_id?: string | null;
+};
+
+export const MattermostPostSchema = z
+  .object({
+    id: z.string(),
+    user_id: z.string().nullable().optional(),
+    channel_id: z.string().nullable().optional(),
+    message: z.string().nullable().optional(),
+    file_ids: z.array(z.string()).nullable().optional(),
+    type: z.string().nullable().optional(),
+    root_id: z.string().nullable().optional(),
+    create_at: z.number().nullable().optional(),
+    props: z.record(z.string(), z.unknown()).nullable().optional(),
+  })
+  .passthrough();
+
+export type MattermostPost = z.infer<typeof MattermostPostSchema>;
+
+export type MattermostFileInfo = {
+  id: string;
+  name?: string | null;
+  mime_type?: string | null;
+  size?: number | null;
+};
+
+export function normalizeMattermostBaseUrl(raw?: string | null): string | undefined {
+  const trimmed = raw?.trim();
+  if (!trimmed) {
+    return undefined;
+  }
+  const withoutTrailing = trimmed.replace(/\/+$/, "");
+  return withoutTrailing.replace(/\/api\/v4$/i, "");
+}
+
+function buildMattermostApiUrl(
+  baseUrl: string, 
+  path: string, 
+  operation = "build-url",
+  context?: Partial<ErrorContext>
+): string {
+  const normalized = normalizeMattermostBaseUrl(baseUrl);
+  if (!normalized) {
+    throw new MissingBaseUrlError(
+      { operation, ...context },
+      new Error("Mattermost baseUrl is required")
+    );
+  }
+  const suffix = path.startsWith("/") ? path : `/${path}`;
+  return `${normalized}/api/v4${suffix}`;
+}
+
+export async function readMattermostError(res: Response): Promise<string> {
+  const contentType = res.headers.get("content-type") ?? "";
+  if (contentType.includes("application/json")) {
+    const data = (await res.json()) as { message?: string } | undefined;
+    if (data?.message) {
+      return data.message;
+    }
+    return JSON.stringify(data);
+  }
+  return await res.text();
+}
+
+export function createMattermostClient(
+  params: {
+    baseUrl: string;
+    botToken: string;
+    pat?: string;
+    fetchImpl?: MattermostFetch;
+    allowPrivateNetwork?: boolean;
+    /** Optional account ID for error context */
+    accountId?: string;
+  },
+  operationContext?: Partial<ErrorContext>
+): MattermostClient {
+  const baseUrl = normalizeMattermostBaseUrl(params.baseUrl);
+  const botToken = params.botToken.trim();
+  const pat = params.pat?.trim();
+  
+  if (!baseUrl) {
+    throw new MissingBaseUrlError(
+      { operation: "create-client", accountId: params.accountId, ...operationContext },
+      new Error("Mattermost baseUrl is required")
+    );
+  }
+  
+  if (!botToken) {
+    throw new MissingBotTokenError(
+      { operation: "create-client", accountId: params.accountId, ...operationContext },
+      new Error("Mattermost bot token is required")
+    );
+  }
+  
+  const apiBaseUrl = `${baseUrl}/api/v4`;
+
+  const getTokenForOperation = (operation: "read" | "write"): string => {
+    if (operation === "read") {
+      return botToken;
+    }
+    return pat || botToken;
+  };
+
+  const token = botToken;
+  const errorContext: Partial<ErrorContext> = { 
+    accountId: params.accountId,
+    ...operationContext 
+  };
+  // When no custom fetchImpl is provided (production path), use an SSRF-guarded wrapper
+  // that validates the target URL before making the request (DNS rebinding protection etc.).
+  // A custom fetchImpl is accepted for testing and special cases.
+  const externalFetchImpl = params.fetchImpl;
+
+  // Guarded fetch adapter: calls fetchWithSsrFGuard and returns a plain Response.
+  // Body is buffered before releasing the dispatcher so callers get a complete Response.
+  // Null-body status codes per Fetch spec — Response constructor rejects a body for these.
+  const NULL_BODY_STATUSES = new Set([101, 204, 205, 304]);
+
+  const guardedFetchImpl: MattermostFetch = async (input, init) => {
+    const url =
+      typeof input === "string"
+        ? input
+        : input instanceof URL
+          ? input.toString()
+          : (input as Request).url;
+    const { response, release } = await fetchWithSsrFGuard({
+      url,
+      init,
+      auditContext: "mattermost-api",
+      policy: params.allowPrivateNetwork ? { allowPrivateNetwork: true } : undefined,
+    });
+    try {
+      const bodyBytes = NULL_BODY_STATUSES.has(response.status)
+        ? null
+        : await response.arrayBuffer();
+      return new Response(bodyBytes, { status: response.status, headers: response.headers });
+    } finally {
+      await release();
+    }
+  };
+
+  const fetchImpl = externalFetchImpl ?? guardedFetchImpl;
+
+  const request = async <T>(
+    path: string, 
+    init?: RequestInit, 
+    operation = "api-request"
+  ): Promise<T> => {
+    const url = buildMattermostApiUrl(baseUrl, path, operation, errorContext);
+    const headers = new Headers(init?.headers);
+    headers.set("Authorization", `Bearer ${token}`);
+    if (typeof init?.body === "string" && !headers.has("Content-Type")) {
+      headers.set("Content-Type", "application/json");
+    }
+    
+    const operationName = `${operation}: ${path}`;
+    const requestContext: Partial<ErrorContext> = {
+      ...errorContext,
+      requestPath: path,
+    };
+
+    try {
+      const res = await fetchImpl(url, { ...init, headers });
+      
+      if (!res.ok) {
+        const error = await createErrorFromResponse(res, operationName, requestContext);
+        throw error;
+      }
+
+      if (res.status === 204) {
+        return undefined as T;
+      }
+
+      const contentType = res.headers.get("content-type") ?? "";
+      if (contentType.includes("application/json")) {
+        return (await res.json()) as T;
+      }
+
+      return (await res.text()) as T;
+    } catch (err) {
+      if (err instanceof MattermostError) {
+        throw err;
+      }
+      
+      const isNetworkError = err instanceof TypeError || 
+        (err instanceof Error && (
+          err.message.includes("fetch") ||
+          err.message.includes("network") ||
+          err.message.includes("ECONN")
+        ));
+      
+      if (isNetworkError) {
+        throw new NetworkError(
+          `Network error during ${operationName}`,
+          createErrorContext(operationName, requestContext),
+          err
+        );
+      }
+      
+      throw err;
+    }
+  };
+
+  return { baseUrl, apiBaseUrl, token, request, fetchImpl, getTokenForOperation };
+}
+
+export async function fetchMattermostMe(
+  client: MattermostClient,
+  context?: Partial<ErrorContext>
+): Promise<MattermostUser> {
+  return await client.request<MattermostUser>("/users/me", undefined, "fetch-me");
+}
+
+export async function fetchMattermostUser(
+  client: MattermostClient,
+  userId: string,
+  context?: Partial<ErrorContext>
+): Promise<MattermostUser> {
+  return await client.request<MattermostUser>(
+    `/users/${userId}`, 
+    undefined, 
+    "fetch-user"
+  );
+}
+
+export async function fetchMattermostUserByUsername(
+  client: MattermostClient,
+  username: string,
+): Promise<MattermostUser> {
+  return await client.request<MattermostUser>(`/users/username/${encodeURIComponent(username)}`);
+}
+
+export async function fetchMattermostChannel(
+  client: MattermostClient,
+  channelId: string,
+): Promise<MattermostChannel> {
+  return await client.request<MattermostChannel>(`/channels/${channelId}`);
+}
+
+export async function fetchMattermostChannelByName(
+  client: MattermostClient,
+  teamId: string,
+  channelName: string,
+): Promise<MattermostChannel> {
+  return await client.request<MattermostChannel>(
+    `/teams/${teamId}/channels/name/${encodeURIComponent(channelName)}`,
+  );
+}
+
+export async function sendMattermostTyping(
+  client: MattermostClient,
+  params: { channelId: string; parentId?: string },
+): Promise<void> {
+  const payload: Record<string, string> = {
+    channel_id: params.channelId,
+  };
+  const parentId = params.parentId?.trim();
+  if (parentId) {
+    payload.parent_id = parentId;
+  }
+  await client.request<Record<string, unknown>>("/users/me/typing", {
+    method: "POST",
+    body: JSON.stringify(payload),
+  });
+}
+
+export async function createMattermostDirectChannel(
+  client: MattermostClient,
+  userIds: string[],
+  signal?: AbortSignal,
+): Promise<MattermostChannel> {
+  return await client.request<MattermostChannel>("/channels/direct", {
+    method: "POST",
+    body: JSON.stringify(userIds),
+    signal,
+  });
+}
+
+export type CreateDmChannelRetryOptions = {
+  /** Maximum number of retry attempts (default: 3) */
+  maxRetries?: number;
+  /** Initial delay in milliseconds (default: 1000) */
+  initialDelayMs?: number;
+  /** Maximum delay in milliseconds (default: 10000) */
+  maxDelayMs?: number;
+  /** Timeout for each individual request in milliseconds (default: 30000) */
+  timeoutMs?: number;
+  /** Optional logger for retry events */
+  onRetry?: (attempt: number, delayMs: number, error: Error) => void;
+};
+
+export async function createMattermostDirectChannelWithRetry(
+  client: MattermostClient,
+  userIds: string[],
+  options: CreateDmChannelRetryOptions = {},
+  context?: Partial<ErrorContext>
+): Promise<MattermostChannel> {
+  const {
+    maxRetries = 3,
+    initialDelayMs = 1000,
+    maxDelayMs = 10000,
+    timeoutMs = 30000,
+    onRetry,
+  } = options;
+
+  const operationContext: Partial<ErrorContext> = {
+    operation: "create-dm-channel",
+    ...context,
+  };
+
+  const retryConfig: RetryConfig = {
+    maxRetries,
+    initialDelayMs,
+    maxDelayMs,
+    timeoutMs,
+    onRetry: onRetry 
+      ? (info) => onRetry(info.attempt, info.delayMs, info.error)
+      : undefined,
+  };
+
+  return await withRetry(
+    "create-dm-channel",
+    async () => {
+      const controller = new AbortController();
+      const timeoutId = setTimeout(() => controller.abort(), timeoutMs);
+      
+      try {
+        return await createMattermostDirectChannel(client, userIds, controller.signal);
+      } finally {
+        clearTimeout(timeoutId);
+      }
+    },
+    retryConfig,
+    operationContext
+  );
+}
+
+export async function createMattermostPost(
+  client: MattermostClient,
+  params: {
+    channelId: string;
+    message: string;
+    rootId?: string;
+    fileIds?: string[];
+    props?: Record<string, unknown>;
+  },
+): Promise<MattermostPost> {
+  const payload: Record<string, unknown> = {
+    channel_id: params.channelId,
+    message: params.message,
+  };
+  if (params.rootId) {
+    payload.root_id = params.rootId;
+  }
+  if (params.fileIds?.length) {
+    payload.file_ids = params.fileIds;
+  }
+  if (params.props) {
+    payload.props = params.props;
+  }
+  return await client.request<MattermostPost>("/posts", {
+    method: "POST",
+    body: JSON.stringify(payload),
+  });
+}
+
+export type MattermostTeam = {
+  id: string;
+  name?: string | null;
+  display_name?: string | null;
+};
+
+export async function fetchMattermostUserTeams(
+  client: MattermostClient,
+  userId: string,
+): Promise<MattermostTeam[]> {
+  return await client.request<MattermostTeam[]>(`/users/${userId}/teams`);
+}
+
+export async function updateMattermostPost(
+  client: MattermostClient,
+  postId: string,
+  params: {
+    message?: string;
+    props?: Record<string, unknown>;
+  },
+): Promise<MattermostPost> {
+  const payload: Record<string, unknown> = { id: postId };
+  if (params.message !== undefined) {
+    payload.message = params.message;
+  }
+  if (params.props !== undefined) {
+    payload.props = params.props;
+  }
+  return await client.request<MattermostPost>(`/posts/${postId}`, {
+    method: "PUT",
+    body: JSON.stringify(payload),
+  });
+}
+
+export async function uploadMattermostFile(
+  client: MattermostClient,
+  params: {
+    channelId: string;
+    buffer: Buffer;
+    fileName: string;
+    contentType?: string;
+  },
+): Promise<MattermostFileInfo> {
+  const form = new FormData();
+  const fileName = params.fileName?.trim() || "upload";
+  const bytes = Uint8Array.from(params.buffer);
+  const blob = params.contentType
+    ? new Blob([bytes], { type: params.contentType })
+    : new Blob([bytes]);
+  form.append("files", blob, fileName);
+  form.append("channel_id", params.channelId);
+
+  const res = await client.fetchImpl(`${client.apiBaseUrl}/files`, {
+    method: "POST",
+    headers: {
+      Authorization: `Bearer ${client.token}`,
+    },
+    body: form,
+  });
+
+  if (!res.ok) {
+    const detail = await readMattermostError(res);
+    throw new Error(`Mattermost API ${res.status} ${res.statusText}: ${detail || "unknown error"}`);
+  }
+
+  const data = (await res.json()) as { file_infos?: MattermostFileInfo[] };
+  const info = data.file_infos?.[0];
+  if (!info?.id) {
+    throw new Error("Mattermost file upload failed");
+  }
+  return info;
+}

extensions/mattermost/src/mattermost/directory.test.ts

@@ -0,0 +1,172 @@
+import { beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+
+const {
+  listMattermostAccountIdsMock,
+  resolveMattermostAccountMock,
+  createMattermostClientMock,
+  fetchMattermostMeMock,
+} = vi.hoisted(() => {
+  return {
+    listMattermostAccountIdsMock: vi.fn(),
+    resolveMattermostAccountMock: vi.fn(),
+    createMattermostClientMock: vi.fn(),
+    fetchMattermostMeMock: vi.fn(),
+  };
+});
+
+vi.mock("./accounts.js", () => {
+  return {
+    listMattermostAccountIds: listMattermostAccountIdsMock,
+    resolveMattermostAccount: resolveMattermostAccountMock,
+  };
+});
+
+vi.mock("./client.js", () => {
+  return {
+    createMattermostClient: createMattermostClientMock,
+    fetchMattermostMe: fetchMattermostMeMock,
+  };
+});
+
+let listMattermostDirectoryGroups: typeof import("./directory.js").listMattermostDirectoryGroups;
+let listMattermostDirectoryPeers: typeof import("./directory.js").listMattermostDirectoryPeers;
+
+describe("mattermost directory", () => {
+  beforeAll(async () => {
+    ({ listMattermostDirectoryGroups, listMattermostDirectoryPeers } =
+      await import("./directory.js"));
+  });
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("deduplicates channels across enabled accounts and skips failing accounts", async () => {
+    const clientA = {
+      token: "token-a",
+      request: vi.fn().mockResolvedValueOnce([
+        { id: "chan-1", type: "O", name: "alerts", display_name: "Alerts" },
+        { id: "chan-2", type: "P", name: "ops", display_name: "Ops" },
+        { id: "chan-3", type: "D", name: "dm", display_name: "Direct" },
+      ]),
+    };
+    const clientB = {
+      token: "token-b",
+      request: vi.fn().mockRejectedValue(new Error("expired token")),
+    };
+    const clientC = {
+      token: "token-c",
+      request: vi.fn().mockResolvedValueOnce([
+        { id: "chan-2", type: "P", name: "ops", display_name: "Ops" },
+        { id: "chan-4", type: "O", name: "infra", display_name: "Infra" },
+      ]),
+    };
+
+    listMattermostAccountIdsMock.mockReturnValue(["default", "alerts", "infra"]);
+    resolveMattermostAccountMock.mockImplementation(({ accountId }) => {
+      if (accountId === "disabled") {
+        return { enabled: false };
+      }
+      return { enabled: true, botToken: `token-${accountId}`, baseUrl: "https://chat.example.com" };
+    });
+    createMattermostClientMock
+      .mockReturnValueOnce(clientA)
+      .mockReturnValueOnce(clientB)
+      .mockReturnValueOnce(clientC);
+    fetchMattermostMeMock.mockResolvedValue({ id: "me-1" });
+
+    await expect(
+      listMattermostDirectoryGroups({
+        cfg: {} as never,
+        runtime: {} as never,
+        query: "  op  ",
+      }),
+    ).resolves.toEqual([{ kind: "group", id: "channel:chan-2", name: "ops", handle: "Ops" }]);
+  });
+
+  it("uses the first healthy client for peers and filters self and blanks", async () => {
+    const client = {
+      token: "token-default",
+      request: vi
+        .fn()
+        .mockResolvedValueOnce([{ id: "team-1" }])
+        .mockResolvedValueOnce([{ user_id: "me-1" }, { user_id: "user-1" }, { user_id: "user-2" }])
+        .mockResolvedValueOnce([
+          {
+            id: "user-1",
+            username: "alice",
+            first_name: "Alice",
+            last_name: "Ng",
+          },
+          {
+            id: "user-2",
+            username: "bob",
+            nickname: "Bobby",
+          },
+          {
+            id: "me-1",
+            username: "self",
+          },
+        ]),
+    };
+
+    listMattermostAccountIdsMock.mockReturnValue(["default"]);
+    resolveMattermostAccountMock.mockReturnValue({
+      enabled: true,
+      botToken: "token-default",
+      baseUrl: "https://chat.example.com",
+    });
+    createMattermostClientMock.mockReturnValue(client);
+    fetchMattermostMeMock.mockResolvedValue({ id: "me-1" });
+
+    await expect(
+      listMattermostDirectoryPeers({
+        cfg: {} as never,
+        runtime: {} as never,
+      }),
+    ).resolves.toEqual([
+      { kind: "user", id: "user:user-1", name: "alice", handle: "Alice Ng" },
+      { kind: "user", id: "user:user-2", name: "bob", handle: "Bobby" },
+    ]);
+  });
+
+  it("uses user search when a query is present and applies limits", async () => {
+    const client = {
+      token: "token-default",
+      request: vi
+        .fn()
+        .mockResolvedValueOnce([{ id: "team-1" }])
+        .mockResolvedValueOnce([
+          { id: "user-1", username: "alice", first_name: "Alice", last_name: "Ng" },
+          { id: "user-2", username: "alex", nickname: "Lex" },
+        ]),
+    };
+
+    listMattermostAccountIdsMock.mockReturnValue(["default"]);
+    resolveMattermostAccountMock.mockReturnValue({
+      enabled: true,
+      botToken: "token-default",
+      baseUrl: "https://chat.example.com",
+    });
+    createMattermostClientMock.mockReturnValue(client);
+    fetchMattermostMeMock.mockResolvedValue({ id: "me-1" });
+
+    await expect(
+      listMattermostDirectoryPeers({
+        cfg: {} as never,
+        runtime: {} as never,
+        query: "  ali  ",
+        limit: 1,
+      }),
+    ).resolves.toEqual([{ kind: "user", id: "user:user-1", name: "alice", handle: "Alice Ng" }]);
+
+    expect(client.request).toHaveBeenNthCalledWith(
+      2,
+      "/users/search",
+      expect.objectContaining({
+        method: "POST",
+        body: JSON.stringify({ term: "ali", team_id: "team-1" }),
+      }),
+    );
+  });
+});

extensions/mattermost/src/mattermost/directory.ts

@@ -0,0 +1,172 @@
+import { listMattermostAccountIds, resolveMattermostAccount } from "./accounts.js";
+import {
+  createMattermostClient,
+  fetchMattermostMe,
+  type MattermostChannel,
+  type MattermostClient,
+  type MattermostUser,
+} from "./client.js";
+import type { ChannelDirectoryEntry, OpenClawConfig, RuntimeEnv } from "./runtime-api.js";
+
+export type MattermostDirectoryParams = {
+  cfg: OpenClawConfig;
+  accountId?: string | null;
+  query?: string | null;
+  limit?: number | null;
+  runtime: RuntimeEnv;
+};
+
+function buildClient(params: {
+  cfg: OpenClawConfig;
+  accountId?: string | null;
+}): MattermostClient | null {
+  const account = resolveMattermostAccount({ cfg: params.cfg, accountId: params.accountId });
+  if (!account.enabled || !account.botToken || !account.baseUrl) {
+    return null;
+  }
+  return createMattermostClient({
+    baseUrl: account.baseUrl,
+    botToken: account.botToken,
+    allowPrivateNetwork: account.config?.allowPrivateNetwork === true,
+  });
+}
+
+/**
+ * Build clients from ALL enabled accounts (deduplicated by token).
+ *
+ * We always scan every account because:
+ * - Private channels are only visible to bots that are members
+ * - The requesting agent's account may have an expired/invalid token
+ *
+ * This means a single healthy bot token is enough for directory discovery.
+ */
+function buildClients(params: MattermostDirectoryParams): MattermostClient[] {
+  const accountIds = listMattermostAccountIds(params.cfg);
+  const seen = new Set<string>();
+  const clients: MattermostClient[] = [];
+  for (const id of accountIds) {
+    const client = buildClient({ cfg: params.cfg, accountId: id });
+    if (client && !seen.has(client.token)) {
+      seen.add(client.token);
+      clients.push(client);
+    }
+  }
+  return clients;
+}
+
+/**
+ * List channels (public + private) visible to any configured bot account.
+ *
+ * NOTE: Uses per_page=200 which covers most instances. Mattermost does not
+ * return a "has more" indicator, so very large instances (200+ channels per bot)
+ * may see incomplete results. Pagination can be added if needed.
+ */
+export async function listMattermostDirectoryGroups(
+  params: MattermostDirectoryParams,
+): Promise<ChannelDirectoryEntry[]> {
+  const clients = buildClients(params);
+  if (!clients.length) {
+    return [];
+  }
+  const q = params.query?.trim().toLowerCase() || "";
+  const seenIds = new Set<string>();
+  const entries: ChannelDirectoryEntry[] = [];
+
+  for (const client of clients) {
+    try {
+      const me = await fetchMattermostMe(client);
+      const channels = await client.request<MattermostChannel[]>(
+        `/users/${me.id}/channels?per_page=200`,
+      );
+      for (const ch of channels) {
+        if (ch.type !== "O" && ch.type !== "P") continue;
+        if (seenIds.has(ch.id)) continue;
+        if (q) {
+          const name = (ch.name ?? "").toLowerCase();
+          const display = (ch.display_name ?? "").toLowerCase();
+          if (!name.includes(q) && !display.includes(q)) continue;
+        }
+        seenIds.add(ch.id);
+        entries.push({
+          kind: "group" as const,
+          id: `channel:${ch.id}`,
+          name: ch.name ?? undefined,
+          handle: ch.display_name ?? undefined,
+        });
+      }
+    } catch (err) {
+      // Token may be expired/revoked — skip this account and try others
+      console.debug?.(
+        "[mattermost-directory] listGroups: skipping account:",
+        (err as Error)?.message,
+      );
+      continue;
+    }
+  }
+  return params.limit && params.limit > 0 ? entries.slice(0, params.limit) : entries;
+}
+
+/**
+ * List team members as peer directory entries.
+ *
+ * Uses only the first available client since all bots in a team see the same
+ * user list (unlike channels where membership varies). Uses the first team
+ * returned — multi-team setups will only see members from that team.
+ *
+ * NOTE: per_page=200 for member listing; same pagination caveat as groups.
+ */
+export async function listMattermostDirectoryPeers(
+  params: MattermostDirectoryParams,
+): Promise<ChannelDirectoryEntry[]> {
+  const clients = buildClients(params);
+  if (!clients.length) {
+    return [];
+  }
+  // All bots see the same user list, so one client suffices (unlike channels
+  // where private channel membership varies per bot).
+  const client = clients[0];
+  try {
+    const me = await fetchMattermostMe(client);
+    const teams = await client.request<{ id: string }[]>("/users/me/teams");
+    if (!teams.length) {
+      return [];
+    }
+    // Uses first team — multi-team setups may need iteration in the future
+    const teamId = teams[0].id;
+    const q = params.query?.trim().toLowerCase() || "";
+
+    let users: MattermostUser[];
+    if (q) {
+      users = await client.request<MattermostUser[]>("/users/search", {
+        method: "POST",
+        body: JSON.stringify({ term: q, team_id: teamId }),
+      });
+    } else {
+      const members = await client.request<{ user_id: string }[]>(
+        `/teams/${teamId}/members?per_page=200`,
+      );
+      const userIds = members.map((m) => m.user_id).filter((id) => id !== me.id);
+      if (!userIds.length) {
+        return [];
+      }
+      users = await client.request<MattermostUser[]>("/users/ids", {
+        method: "POST",
+        body: JSON.stringify(userIds),
+      });
+    }
+
+    const entries = users
+      .filter((u) => u.id !== me.id)
+      .map((u) => ({
+        kind: "user" as const,
+        id: `user:${u.id}`,
+        name: u.username ?? undefined,
+        handle:
+          [u.first_name, u.last_name].filter(Boolean).join(" ").trim() || u.nickname || undefined,
+      }));
+    return params.limit && params.limit > 0 ? entries.slice(0, params.limit) : entries;
+  } catch (err) {
+    console.debug?.("[mattermost-directory] listPeers failed:", (err as Error)?.message);
+    return [];
+  }
+}

extensions/mattermost/src/mattermost/index.ts

@@ -0,0 +1,9 @@
+export {
+  listEnabledMattermostAccounts,
+  listMattermostAccountIds,
+  resolveDefaultMattermostAccountId,
+  resolveMattermostAccount,
+} from "./accounts.js";
+export { monitorMattermostProvider } from "./monitor.js";
+export { probeMattermost } from "./probe.js";
+export { sendMessageMattermost } from "./send.js";

extensions/mattermost/src/mattermost/interactions.test.ts

@@ -0,0 +1,887 @@
+import { type IncomingMessage, type ServerResponse } from "node:http";
+import { describe, expect, it, beforeEach, afterEach, vi } from "vitest";
+import type { PluginRuntime } from "../../runtime-api.js";
+import { setMattermostRuntime } from "../runtime.js";
+import { resolveMattermostAccount } from "./accounts.js";
+import type { MattermostClient, MattermostPost } from "./client.js";
+import {
+  buildButtonAttachments,
+  computeInteractionCallbackUrl,
+  createMattermostInteractionHandler,
+  generateInteractionToken,
+  getInteractionCallbackUrl,
+  getInteractionSecret,
+  resolveInteractionCallbackPath,
+  resolveInteractionCallbackUrl,
+  setInteractionCallbackUrl,
+  setInteractionSecret,
+  verifyInteractionToken,
+} from "./interactions.js";
+
+// ── HMAC token management ────────────────────────────────────────────
+
+describe("setInteractionSecret / getInteractionSecret", () => {
+  beforeEach(() => {
+    // pragma: allowlist secret
+    setInteractionSecret("test-bot-token");
+  });
+
+  it("derives a deterministic secret from the bot token", () => {
+    setInteractionSecret("token-a");
+    const secretA = getInteractionSecret();
+    setInteractionSecret("token-a");
+    const secretA2 = getInteractionSecret();
+    expect(secretA).toBe(secretA2);
+  });
+
+  it("produces different secrets for different tokens", () => {
+    setInteractionSecret("token-a");
+    const secretA = getInteractionSecret();
+    setInteractionSecret("token-b");
+    const secretB = getInteractionSecret();
+    expect(secretA).not.toBe(secretB);
+  });
+
+  it("returns a hex string", () => {
+    expect(getInteractionSecret()).toMatch(/^[0-9a-f]+$/);
+  });
+});
+
+// ── Token generation / verification ──────────────────────────────────
+
+describe("generateInteractionToken / verifyInteractionToken", () => {
+  beforeEach(() => {
+    // pragma: allowlist secret
+    setInteractionSecret("test-bot-token");
+  });
+
+  it("generates a hex token", () => {
+    const token = generateInteractionToken({ action_id: "click" });
+    expect(token).toMatch(/^[0-9a-f]{64}$/);
+  });
+
+  it("verifies a valid token", () => {
+    const context = { action_id: "do_now", item_id: "123" };
+    const token = generateInteractionToken(context);
+    expect(verifyInteractionToken(context, token)).toBe(true);
+  });
+
+  it("rejects a tampered token", () => {
+    const context = { action_id: "do_now" };
+    const token = generateInteractionToken(context);
+    const tampered = token.replace(/.$/, token.endsWith("0") ? "1" : "0");
+    expect(verifyInteractionToken(context, tampered)).toBe(false);
+  });
+
+  it("rejects a token generated with different context", () => {
+    const token = generateInteractionToken({ action_id: "a" });
+    expect(verifyInteractionToken({ action_id: "b" }, token)).toBe(false);
+  });
+
+  it("rejects tokens with wrong length", () => {
+    const context = { action_id: "test" };
+    expect(verifyInteractionToken(context, "short")).toBe(false);
+  });
+
+  it("is deterministic for the same context", () => {
+    const context = { action_id: "test", x: 1 };
+    const t1 = generateInteractionToken(context);
+    const t2 = generateInteractionToken(context);
+    expect(t1).toBe(t2);
+  });
+
+  it("produces the same token regardless of key order", () => {
+    const contextA = { action_id: "do_now", tweet_id: "123", action: "do" };
+    const contextB = { action: "do", action_id: "do_now", tweet_id: "123" };
+    const contextC = { tweet_id: "123", action: "do", action_id: "do_now" };
+    const tokenA = generateInteractionToken(contextA);
+    const tokenB = generateInteractionToken(contextB);
+    const tokenC = generateInteractionToken(contextC);
+    expect(tokenA).toBe(tokenB);
+    expect(tokenB).toBe(tokenC);
+  });
+
+  it("verifies a token when Mattermost reorders context keys", () => {
+    // Simulate: token generated with keys in one order, verified with keys in another
+    // (Mattermost reorders context keys when storing/returning interactive message payloads)
+    const originalContext = { action_id: "bm_do", tweet_id: "999", action: "do" };
+    const token = generateInteractionToken(originalContext);
+
+    // Mattermost returns keys in alphabetical order (or any arbitrary order)
+    const reorderedContext = { action: "do", action_id: "bm_do", tweet_id: "999" };
+    expect(verifyInteractionToken(reorderedContext, token)).toBe(true);
+  });
+
+  it("verifies nested context regardless of nested key order", () => {
+    const originalContext = {
+      action_id: "nested",
+      payload: {
+        model: "gpt-5",
+        meta: {
+          provider: "openai",
+          page: 2,
+        },
+      },
+    };
+    const token = generateInteractionToken(originalContext);
+
+    const reorderedContext = {
+      payload: {
+        meta: {
+          page: 2,
+          provider: "openai",
+        },
+        model: "gpt-5",
+      },
+      action_id: "nested",
+    };
+
+    expect(verifyInteractionToken(reorderedContext, token)).toBe(true);
+  });
+
+  it("rejects nested context tampering", () => {
+    const originalContext = {
+      action_id: "nested",
+      payload: {
+        provider: "openai",
+        model: "gpt-5",
+      },
+    };
+    const token = generateInteractionToken(originalContext);
+    const tamperedContext = {
+      action_id: "nested",
+      payload: {
+        provider: "anthropic",
+        model: "gpt-5",
+      },
+    };
+
+    expect(verifyInteractionToken(tamperedContext, token)).toBe(false);
+  });
+
+  it("scopes tokens per account when account secrets differ", () => {
+    // pragma: allowlist secret
+    setInteractionSecret("acct-a", "bot-token-a");
+    // pragma: allowlist secret
+    setInteractionSecret("acct-b", "bot-token-b");
+    const context = { action_id: "do_now", item_id: "123" };
+    const tokenA = generateInteractionToken(context, "acct-a");
+
+    expect(verifyInteractionToken(context, tokenA, "acct-a")).toBe(true);
+    expect(verifyInteractionToken(context, tokenA, "acct-b")).toBe(false);
+  });
+});
+
+// ── Callback URL registry ────────────────────────────────────────────
+
+describe("callback URL registry", () => {
+  it("stores and retrieves callback URLs", () => {
+    setInteractionCallbackUrl("acct1", "http://localhost:18789/mattermost/interactions/acct1");
+    expect(getInteractionCallbackUrl("acct1")).toBe(
+      "http://localhost:18789/mattermost/interactions/acct1",
+    );
+  });
+
+  it("returns undefined for unknown account", () => {
+    expect(getInteractionCallbackUrl("nonexistent-account-id")).toBeUndefined();
+  });
+});
+
+describe("resolveInteractionCallbackUrl", () => {
+  afterEach(() => {
+    for (const accountId of ["cached", "default", "acct", "myaccount"]) {
+      setInteractionCallbackUrl(accountId, "");
+    }
+  });
+
+  it("prefers cached URL from registry", () => {
+    setInteractionCallbackUrl("cached", "http://cached:1234/path");
+    expect(resolveInteractionCallbackUrl("cached")).toBe("http://cached:1234/path");
+  });
+
+  it("recomputes from config when bypassing the cache explicitly", () => {
+    setInteractionCallbackUrl("acct", "http://cached:1234/path");
+    const url = computeInteractionCallbackUrl("acct", {
+      gateway: { port: 9999, customBindHost: "gateway.internal" },
+    });
+    expect(url).toBe("http://gateway.internal:9999/mattermost/interactions/acct");
+  });
+
+  it("uses interactions.callbackBaseUrl when configured", () => {
+    const url = resolveInteractionCallbackUrl("default", {
+      channels: {
+        mattermost: {
+          interactions: {
+            callbackBaseUrl: "https://gateway.example.com/openclaw",
+          },
+        },
+      },
+    });
+    expect(url).toBe("https://gateway.example.com/openclaw/mattermost/interactions/default");
+  });
+
+  it("trims trailing slashes from callbackBaseUrl", () => {
+    const url = resolveInteractionCallbackUrl("acct", {
+      channels: {
+        mattermost: {
+          interactions: {
+            callbackBaseUrl: "https://gateway.example.com/root///",
+          },
+        },
+      },
+    });
+    expect(url).toBe("https://gateway.example.com/root/mattermost/interactions/acct");
+  });
+
+  it("uses merged per-account interactions.callbackBaseUrl", () => {
+    const cfg = {
+      gateway: { port: 9999 },
+      channels: {
+        mattermost: {
+          accounts: {
+            acct: {
+              // pragma: allowlist secret
+    botToken: "bot-token",
+              baseUrl: "https://chat.example.com",
+              interactions: {
+                callbackBaseUrl: "https://gateway.example.com/root",
+              },
+            },
+          },
+        },
+      },
+    };
+    const account = resolveMattermostAccount({
+      cfg,
+      accountId: "acct",
+      allowUnresolvedSecretRef: true,
+    });
+    const url = resolveInteractionCallbackUrl(account.accountId, {
+      gateway: cfg.gateway,
+      interactions: account.config.interactions,
+    });
+    expect(url).toBe("https://gateway.example.com/root/mattermost/interactions/acct");
+  });
+
+  it("falls back to gateway.customBindHost when configured", () => {
+    const url = resolveInteractionCallbackUrl("default", {
+      gateway: { port: 9999, customBindHost: "gateway.internal" },
+    });
+    expect(url).toBe("http://gateway.internal:9999/mattermost/interactions/default");
+  });
+
+  it("falls back to localhost when customBindHost is a wildcard bind address", () => {
+    const url = resolveInteractionCallbackUrl("default", {
+      gateway: { port: 9999, customBindHost: "0.0.0.0" },
+    });
+    expect(url).toBe("http://localhost:9999/mattermost/interactions/default");
+  });
+
+  it("brackets IPv6 custom bind hosts", () => {
+    const url = resolveInteractionCallbackUrl("acct", {
+      gateway: { port: 9999, customBindHost: "::1" },
+    });
+    expect(url).toBe("http://[::1]:9999/mattermost/interactions/acct");
+  });
+
+  it("uses default port 18789 when no config provided", () => {
+    const url = resolveInteractionCallbackUrl("myaccount");
+    expect(url).toBe("http://localhost:18789/mattermost/interactions/myaccount");
+  });
+});
+
+describe("resolveInteractionCallbackPath", () => {
+  it("builds the per-account callback path", () => {
+    expect(resolveInteractionCallbackPath("acct")).toBe("/mattermost/interactions/acct");
+  });
+});
+
+// ── buildButtonAttachments ───────────────────────────────────────────
+
+describe("buildButtonAttachments", () => {
+  beforeEach(() => {
+    setInteractionSecret("test-bot-token");
+  });
+
+  it("returns an array with one attachment containing all buttons", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost:18789/mattermost/interactions/default",
+      buttons: [
+        { id: "btn1", name: "Click Me" },
+        { id: "btn2", name: "Skip", style: "danger" },
+      ],
+    });
+
+    expect(result).toHaveLength(1);
+    expect(result[0].actions).toHaveLength(2);
+  });
+
+  it("sets type to 'button' on every action", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost:18789/cb",
+      buttons: [{ id: "a", name: "A" }],
+    });
+
+    expect(result[0].actions![0].type).toBe("button");
+  });
+
+  it("includes HMAC _token in integration context", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost:18789/cb",
+      buttons: [{ id: "test", name: "Test" }],
+    });
+
+    const action = result[0].actions![0];
+    expect(action.integration.context._token).toMatch(/^[0-9a-f]{64}$/);
+  });
+
+  it("includes sanitized action_id in integration context", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost:18789/cb",
+      buttons: [{ id: "my_action", name: "Do It" }],
+    });
+
+    const action = result[0].actions![0];
+    // sanitizeActionId strips hyphens and underscores (Mattermost routing bug #25747)
+    expect(action.integration.context.action_id).toBe("myaction");
+    expect(action.id).toBe("myaction");
+  });
+
+  it("merges custom context into integration context", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost:18789/cb",
+      buttons: [{ id: "btn", name: "Go", context: { tweet_id: "123", batch: true } }],
+    });
+
+    const ctx = result[0].actions![0].integration.context;
+    expect(ctx.tweet_id).toBe("123");
+    expect(ctx.batch).toBe(true);
+    expect(ctx.action_id).toBe("btn");
+    expect(ctx._token).toBeDefined();
+  });
+
+  it("passes callback URL to each button integration", () => {
+    const url = "http://localhost:18789/mattermost/interactions/default";
+    const result = buildButtonAttachments({
+      callbackUrl: url,
+      buttons: [
+        { id: "a", name: "A" },
+        { id: "b", name: "B" },
+      ],
+    });
+
+    for (const action of result[0].actions!) {
+      expect(action.integration.url).toBe(url);
+    }
+  });
+
+  it("preserves button style", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost/cb",
+      buttons: [
+        { id: "ok", name: "OK", style: "primary" },
+        { id: "no", name: "No", style: "danger" },
+      ],
+    });
+
+    expect(result[0].actions![0].style).toBe("primary");
+    expect(result[0].actions![1].style).toBe("danger");
+  });
+
+  it("uses provided text for the attachment", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost/cb",
+      buttons: [{ id: "x", name: "X" }],
+      text: "Choose an action:",
+    });
+
+    expect(result[0].text).toBe("Choose an action:");
+  });
+
+  it("defaults to empty string text when not provided", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost/cb",
+      buttons: [{ id: "x", name: "X" }],
+    });
+
+    expect(result[0].text).toBe("");
+  });
+
+  it("generates verifiable tokens", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost/cb",
+      buttons: [{ id: "verify_me", name: "V", context: { extra: "data" } }],
+    });
+
+    const ctx = result[0].actions![0].integration.context;
+    const token = ctx._token as string;
+    const { _token, ...contextWithoutToken } = ctx;
+    expect(verifyInteractionToken(contextWithoutToken, token)).toBe(true);
+  });
+
+  it("generates tokens that verify even when Mattermost reorders context keys", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost/cb",
+      buttons: [{ id: "do_action", name: "Do", context: { tweet_id: "42", category: "ai" } }],
+    });
+
+    const ctx = result[0].actions![0].integration.context;
+    const token = ctx._token as string;
+
+    // Simulate Mattermost returning context with keys in a different order
+    const reordered: Record<string, unknown> = {};
+    const keys = Object.keys(ctx).filter((k) => k !== "_token");
+    // Reverse the key order to simulate reordering
+    for (const key of keys.reverse()) {
+      reordered[key] = ctx[key];
+    }
+    expect(verifyInteractionToken(reordered, token)).toBe(true);
+  });
+});
+
+describe("createMattermostInteractionHandler", () => {
+  function setInteractionRuntime(
+    enqueueSystemEvent: (
+      text: string,
+      options: { sessionKey?: string | null; sessionId?: string | null; userId?: string | null },
+    ) => boolean = () => true,
+  ) {
+    setMattermostRuntime({
+      system: {
+        enqueueSystemEvent,
+      },
+    } as unknown as PluginRuntime);
+  }
+
+  function createMattermostClientMock(
+    requestImpl: (path: string, init?: { method?: string }) => Promise<unknown>,
+  ): MattermostClient {
+    return {
+      baseUrl: "https://chat.example.com",
+      apiBaseUrl: "https://chat.example.com/api/v4",
+      // pragma: allowlist secret
+      token: "bot-token",
+      request: async <T>(path: string, init?: RequestInit) => (await requestImpl(path, init)) as T,
+      fetchImpl: vi.fn<typeof fetch>(),
+    };
+  }
+
+  beforeEach(() => {
+    setInteractionRuntime();
+    // pragma: allowlist secret
+    setInteractionSecret("acct", "bot-token");
+  });
+
+  function createReq(params: {
+    method?: string;
+    body?: unknown;
+    remoteAddress?: string;
+    headers?: Record<string, string>;
+  }): IncomingMessage {
+    const body = params.body === undefined ? "" : JSON.stringify(params.body);
+    const listeners = new Map<string, Array<(...args: unknown[]) => void>>();
+
+    const req = {
+      method: params.method ?? "POST",
+      headers: params.headers ?? {},
+      socket: { remoteAddress: params.remoteAddress ?? "203.0.113.10" },
+      on(event: string, handler: (...args: unknown[]) => void) {
+        const existing = listeners.get(event) ?? [];
+        existing.push(handler);
+        listeners.set(event, existing);
+        return this;
+      },
+    } as IncomingMessage & { emitTest: (event: string, ...args: unknown[]) => void };
+
+    req.emitTest = (event: string, ...args: unknown[]) => {
+      const handlers = listeners.get(event) ?? [];
+      for (const handler of handlers) {
+        handler(...args);
+      }
+    };
+
+    queueMicrotask(() => {
+      if (body) {
+        req.emitTest("data", Buffer.from(body));
+      }
+      req.emitTest("end");
+    });
+
+    return req;
+  }
+
+  function createRes(): ServerResponse & { headers: Record<string, string>; body: string } {
+    const res = {
+      statusCode: 200,
+      headers: {},
+      body: "",
+      setHeader(name: string, value: string | number | readonly string[]) {
+        res.headers[name] = Array.isArray(value) ? value.join(",") : String(value);
+        return res;
+      },
+      end(
+        chunk?: string | Buffer | Uint8Array,
+        _encoding?: BufferEncoding | (() => void),
+        cb?: () => void,
+      ) {
+        res.body = chunk ? String(chunk) : "";
+        cb?.();
+        return res;
+      },
+    } as ServerResponse & { headers: Record<string, string>; body: string };
+    return res;
+  }
+
+  function createActionContext(actionId = "approve", channelId = "chan-1") {
+    const context = { action_id: actionId, __openclaw_channel_id: channelId };
+    return { context, token: generateInteractionToken(context, "acct") };
+  }
+
+  function createInteractionBody(params: {
+    context: Record<string, unknown>;
+    token: string;
+    channelId?: string;
+    postId?: string;
+    userId?: string;
+    userName?: string;
+  }) {
+    return {
+      user_id: params.userId ?? "user-1",
+      ...(params.userName ? { user_name: params.userName } : {}),
+      channel_id: params.channelId ?? "chan-1",
+      post_id: params.postId ?? "post-1",
+      context: { ...params.context, _token: params.token },
+    };
+  }
+
+  async function runHandler(
+    handler: ReturnType<typeof createMattermostInteractionHandler>,
+    params: {
+      body: unknown;
+      remoteAddress?: string;
+      headers?: Record<string, string>;
+    },
+  ) {
+    const req = createReq({
+      remoteAddress: params.remoteAddress,
+      headers: params.headers,
+      body: params.body,
+    });
+    const res = createRes();
+    await handler(req, res);
+    return res;
+  }
+
+  function expectForbiddenResponse(
+    res: ServerResponse & { body: string },
+    expectedMessage: string,
+  ) {
+    expect(res.statusCode).toBe(403);
+    expect(res.body).toContain(expectedMessage);
+  }
+
+  function expectSuccessfulApprovalUpdate(
+    res: ServerResponse & { body: string },
+    requestLog?: Array<{ path: string; method?: string }>,
+  ) {
+    expect(res.statusCode).toBe(200);
+    expect(res.body).toBe("{}");
+    if (requestLog) {
+      expect(requestLog).toEqual([
+        { path: "/posts/post-1", method: undefined },
+        { path: "/posts/post-1", method: "PUT" },
+      ]);
+    }
+  }
+
+  function createActionPost(params?: {
+    actionId?: string;
+    actionName?: string;
+    channelId?: string;
+    rootId?: string;
+  }): MattermostPost {
+    return {
+      id: "post-1",
+      channel_id: params?.channelId ?? "chan-1",
+      ...(params?.rootId ? { root_id: params.rootId } : {}),
+      message: "Choose",
+      props: {
+        attachments: [
+          {
+            actions: [
+              {
+                id: params?.actionId ?? "approve",
+                name: params?.actionName ?? "Approve",
+              },
+            ],
+          },
+        ],
+      },
+    };
+  }
+
+  function createUnusedInteractionHandler() {
+    return createMattermostInteractionHandler({
+      client: createMattermostClientMock(async () => ({ message: "unused" })),
+      botUserId: "bot",
+      accountId: "acct",
+    });
+  }
+
+  async function runApproveInteraction(params?: {
+    actionName?: string;
+    allowedSourceIps?: string[];
+    trustedProxies?: string[];
+    remoteAddress?: string;
+    headers?: Record<string, string>;
+  }) {
+    const { context, token } = createActionContext();
+    const requestLog: Array<{ path: string; method?: string }> = [];
+    const handler = createMattermostInteractionHandler({
+      client: createMattermostClientMock(async (path: string, init?: { method?: string }) => {
+        requestLog.push({ path, method: init?.method });
+        if (init?.method === "PUT") {
+          return { id: "post-1" };
+        }
+        return createActionPost({ actionName: params?.actionName });
+      }),
+      botUserId: "bot",
+      accountId: "acct",
+      allowedSourceIps: params?.allowedSourceIps,
+      trustedProxies: params?.trustedProxies,
+    });
+
+    const res = await runHandler(handler, {
+      remoteAddress: params?.remoteAddress,
+      headers: params?.headers,
+      body: createInteractionBody({ context, token, userName: "alice" }),
+    });
+    return { res, requestLog };
+  }
+
+  async function runInvalidActionRequest(actionId: string) {
+    const { context, token } = createActionContext();
+    const handler = createMattermostInteractionHandler({
+      client: createMattermostClientMock(async () =>
+        createActionPost({ actionId, actionName: actionId }),
+      ),
+      botUserId: "bot",
+      accountId: "acct",
+    });
+
+    return await runHandler(handler, {
+      body: createInteractionBody({ context, token }),
+    });
+  }
+
+  it("accepts callback requests from an allowlisted source IP", async () => {
+    const { res, requestLog } = await runApproveInteraction({
+      allowedSourceIps: ["198.51.100.8"],
+      remoteAddress: "198.51.100.8",
+    });
+
+    expectSuccessfulApprovalUpdate(res, requestLog);
+  });
+
+  it("accepts forwarded Mattermost source IPs from a trusted proxy", async () => {
+    const { res } = await runApproveInteraction({
+      allowedSourceIps: ["198.51.100.8"],
+      trustedProxies: ["127.0.0.1"],
+      remoteAddress: "127.0.0.1",
+      headers: { "x-forwarded-for": "198.51.100.8" },
+    });
+
+    expect(res.statusCode).toBe(200);
+    expect(res.body).toBe("{}");
+  });
+
+  it("rejects callback requests from non-allowlisted source IPs", async () => {
+    const { context, token } = createActionContext();
+    const handler = createMattermostInteractionHandler({
+      client: createMattermostClientMock(async () => {
+        throw new Error("should not fetch post for rejected origins");
+      }),
+      botUserId: "bot",
+      accountId: "acct",
+      allowedSourceIps: ["127.0.0.1"],
+    });
+
+    const res = await runHandler(handler, {
+      remoteAddress: "198.51.100.8",
+      body: createInteractionBody({ context, token }),
+    });
+    expectForbiddenResponse(res, "Forbidden origin");
+  });
+
+  it("rejects requests with an invalid interaction token", async () => {
+    const handler = createUnusedInteractionHandler();
+
+    const res = await runHandler(handler, {
+      body: {
+        user_id: "user-1",
+        channel_id: "chan-1",
+        post_id: "post-1",
+        context: { action_id: "approve", _token: "deadbeef" },
+      },
+    });
+    expectForbiddenResponse(res, "Invalid token");
+  });
+
+  it("rejects requests when the signed channel does not match the callback payload", async () => {
+    const { context, token } = createActionContext();
+    const handler = createUnusedInteractionHandler();
+
+    const res = await runHandler(handler, {
+      body: createInteractionBody({ context, token, channelId: "chan-2" }),
+    });
+    expectForbiddenResponse(res, "Channel mismatch");
+  });
+
+  it("rejects requests when the fetched post does not belong to the callback channel", async () => {
+    const { context, token } = createActionContext();
+    const handler = createMattermostInteractionHandler({
+      client: createMattermostClientMock(async () => createActionPost({ channelId: "chan-9" })),
+      botUserId: "bot",
+      accountId: "acct",
+    });
+
+    const res = await runHandler(handler, {
+      body: createInteractionBody({ context, token }),
+    });
+    expectForbiddenResponse(res, "Post/channel mismatch");
+  });
+
+  it("rejects requests when the action is not present on the fetched post", async () => {
+    const res = await runInvalidActionRequest("reject");
+
+    expect(res.statusCode).toBe(403);
+    expect(res.body).toContain("Unknown action");
+  });
+
+  it("accepts actions when the button name matches the action id", async () => {
+    const { res, requestLog } = await runApproveInteraction({
+      actionName: "approve",
+    });
+
+    expectSuccessfulApprovalUpdate(res, requestLog);
+  });
+
+  it("blocks button dispatch when the sender is not allowed for the action", async () => {
+    const { context, token } = createActionContext();
+    const dispatchButtonClick = vi.fn();
+    const handleInteraction = vi.fn();
+    const handler = createMattermostInteractionHandler({
+      client: createMattermostClientMock(async (_path: string, init?: { method?: string }) =>
+        init?.method === "PUT" ? { id: "post-1" } : createActionPost(),
+      ),
+      botUserId: "bot",
+      accountId: "acct",
+      authorizeButtonClick: async () => ({
+        ok: false,
+        response: {
+          ephemeral_text: "blocked",
+        },
+      }),
+      handleInteraction,
+      dispatchButtonClick,
+    });
+
+    const res = await runHandler(handler, {
+      body: createInteractionBody({ context, token }),
+    });
+
+    expect(res.statusCode).toBe(200);
+    expect(res.body).toContain("blocked");
+    expect(handleInteraction).not.toHaveBeenCalled();
+    expect(dispatchButtonClick).not.toHaveBeenCalled();
+  });
+
+  it("forwards fetched post threading metadata to session and button callbacks", async () => {
+    const enqueueSystemEvent = vi.fn();
+    setInteractionRuntime(enqueueSystemEvent);
+    const { context, token } = createActionContext();
+    const resolveSessionKey = vi.fn().mockResolvedValue("session:thread:root-9");
+    const dispatchButtonClick = vi.fn();
+    const fetchedPost = createActionPost({ rootId: "root-9" });
+    const handler = createMattermostInteractionHandler({
+      client: createMattermostClientMock(async (_path: string, init?: { method?: string }) =>
+        init?.method === "PUT" ? { id: "post-1" } : fetchedPost,
+      ),
+      botUserId: "bot",
+      accountId: "acct",
+      resolveSessionKey,
+      dispatchButtonClick,
+    });
+
+    const res = await runHandler(handler, {
+      body: createInteractionBody({ context, token, userName: "alice" }),
+    });
+    expect(res.statusCode).toBe(200);
+    expect(resolveSessionKey).toHaveBeenCalledWith({
+      channelId: "chan-1",
+      userId: "user-1",
+      post: fetchedPost,
+    });
+    expect(enqueueSystemEvent).toHaveBeenCalledWith(
+      expect.stringContaining('Mattermost button click: action="approve"'),
+      expect.objectContaining({ sessionKey: "session:thread:root-9" }),
+    );
+    expect(dispatchButtonClick).toHaveBeenCalledWith(
+      expect.objectContaining({
+        channelId: "chan-1",
+        userId: "user-1",
+        postId: "post-1",
+        post: fetchedPost,
+      }),
+    );
+  });
+
+  it("lets a custom interaction handler short-circuit generic completion updates", async () => {
+    const { context, token } = createActionContext("mdlprov");
+    const requestLog: Array<{ path: string; method?: string }> = [];
+    const handleInteraction = vi.fn().mockResolvedValue({
+      ephemeral_text: "Only the original requester can use this picker.",
+    });
+    const dispatchButtonClick = vi.fn();
+    const handler = createMattermostInteractionHandler({
+      client: createMattermostClientMock(async (path: string, init?: { method?: string }) => {
+        requestLog.push({ path, method: init?.method });
+        return createActionPost({
+          actionId: "mdlprov",
+          actionName: "Browse providers",
+        });
+      }),
+      botUserId: "bot",
+      accountId: "acct",
+      handleInteraction,
+      dispatchButtonClick,
+    });
+
+    const res = await runHandler(handler, {
+      body: createInteractionBody({
+        context,
+        token,
+        userId: "user-2",
+        userName: "alice",
+      }),
+    });
+
+    expect(res.statusCode).toBe(200);
+    expect(res.body).toBe(
+      JSON.stringify({
+        ephemeral_text: "Only the original requester can use this picker.",
+      }),
+    );
+    expect(requestLog).toEqual([{ path: "/posts/post-1", method: undefined }]);
+    expect(handleInteraction).toHaveBeenCalledWith(
+      expect.objectContaining({
+        actionId: "mdlprov",
+        actionName: "Browse providers",
+        originalMessage: "Choose",
+        post: expect.objectContaining({ id: "post-1" }),
+        userName: "alice",
+      }),
+    );
+    expect(dispatchButtonClick).not.toHaveBeenCalled();
+  });
+});

extensions/mattermost/src/mattermost/interactions.ts

@@ -0,0 +1,687 @@
+import { createHmac } from "node:crypto";
+import type { IncomingMessage, ServerResponse } from "node:http";
+import { safeEqualSecret } from "openclaw/plugin-sdk/browser-support";
+import { getMattermostRuntime } from "../runtime.js";
+import { updateMattermostPost, type MattermostClient, type MattermostPost } from "./client.js";
+import { isTrustedProxyAddress, resolveClientIp, type OpenClawConfig } from "./runtime-api.js";
+
+const INTERACTION_MAX_BODY_BYTES = 64 * 1024;
+const INTERACTION_BODY_TIMEOUT_MS = 10_000;
+const SIGNED_CHANNEL_ID_CONTEXT_KEY = "__openclaw_channel_id";
+
+/**
+ * Mattermost interactive message callback payload.
+ * Sent by Mattermost when a user clicks an action button.
+ * See: https://developers.mattermost.com/integrate/plugins/interactive-messages/
+ */
+export type MattermostInteractionPayload = {
+  user_id: string;
+  user_name?: string;
+  channel_id: string;
+  team_id?: string;
+  post_id: string;
+  trigger_id?: string;
+  type?: string;
+  data_source?: string;
+  context?: Record<string, unknown>;
+};
+
+export type MattermostInteractionResponse = {
+  update?: {
+    message: string;
+    props?: Record<string, unknown>;
+  };
+  ephemeral_text?: string;
+};
+
+export type MattermostInteractionAuthorizationResult =
+  | { ok: true }
+  | { ok: false; statusCode?: number; response?: MattermostInteractionResponse };
+
+export type MattermostInteractiveButtonInput = {
+  id?: string;
+  callback_data?: string;
+  text?: string;
+  name?: string;
+  label?: string;
+  style?: "default" | "primary" | "danger";
+  context?: Record<string, unknown>;
+};
+
+// ── Callback URL registry ──────────────────────────────────────────────
+
+const callbackUrls = new Map<string, string>();
+
+export function setInteractionCallbackUrl(accountId: string, url: string): void {
+  callbackUrls.set(accountId, url);
+}
+
+export function getInteractionCallbackUrl(accountId: string): string | undefined {
+  return callbackUrls.get(accountId);
+}
+
+type InteractionCallbackConfig = Pick<OpenClawConfig, "gateway" | "channels"> & {
+  interactions?: {
+    callbackBaseUrl?: string;
+  };
+};
+
+export function resolveInteractionCallbackPath(accountId: string): string {
+  return `/mattermost/interactions/${accountId}`;
+}
+
+function isWildcardBindHost(rawHost: string): boolean {
+  const trimmed = rawHost.trim();
+  if (!trimmed) return false;
+  const host = trimmed.startsWith("[") && trimmed.endsWith("]") ? trimmed.slice(1, -1) : trimmed;
+  return host === "0.0.0.0" || host === "::" || host === "0:0:0:0:0:0:0:0" || host === "::0";
+}
+
+function normalizeCallbackBaseUrl(baseUrl: string): string {
+  return baseUrl.trim().replace(/\/+$/, "");
+}
+
+function headerValue(value: string | string[] | undefined): string | undefined {
+  if (Array.isArray(value)) {
+    return value[0]?.trim() || undefined;
+  }
+  return value?.trim() || undefined;
+}
+
+function isAllowedInteractionSource(params: {
+  req: IncomingMessage;
+  allowedSourceIps?: string[];
+  trustedProxies?: string[];
+  allowRealIpFallback?: boolean;
+}): boolean {
+  const { allowedSourceIps } = params;
+  if (!allowedSourceIps?.length) {
+    return true;
+  }
+
+  const clientIp = resolveClientIp({
+    remoteAddr: params.req.socket?.remoteAddress,
+    forwardedFor: headerValue(params.req.headers["x-forwarded-for"]),
+    realIp: headerValue(params.req.headers["x-real-ip"]),
+    trustedProxies: params.trustedProxies,
+    allowRealIpFallback: params.allowRealIpFallback,
+  });
+  return isTrustedProxyAddress(clientIp, allowedSourceIps);
+}
+
+/**
+ * Resolve the interaction callback URL for an account.
+ * Falls back to computing it from interactions.callbackBaseUrl or gateway host config.
+ */
+export function computeInteractionCallbackUrl(
+  accountId: string,
+  cfg?: InteractionCallbackConfig,
+): string {
+  const path = resolveInteractionCallbackPath(accountId);
+  // Prefer merged per-account config when available, but keep the top-level path for
+  // callers/tests that still pass the root Mattermost config shape directly.
+  const callbackBaseUrl =
+    cfg?.interactions?.callbackBaseUrl?.trim() ??
+    cfg?.channels?.mattermost?.interactions?.callbackBaseUrl?.trim();
+  if (callbackBaseUrl) {
+    return `${normalizeCallbackBaseUrl(callbackBaseUrl)}${path}`;
+  }
+  const port = typeof cfg?.gateway?.port === "number" ? cfg.gateway.port : 18789;
+  let host =
+    cfg?.gateway?.customBindHost && !isWildcardBindHost(cfg.gateway.customBindHost)
+      ? cfg.gateway.customBindHost.trim()
+      : "localhost";
+
+  // Bracket IPv6 literals so the URL is valid: http://[::1]:18789/...
+  if (host.includes(":") && !(host.startsWith("[") && host.endsWith("]"))) {
+    host = `[${host}]`;
+  }
+
+  return `http://${host}:${port}${path}`;
+}
+
+/**
+ * Resolve the interaction callback URL for an account.
+ * Prefers the in-memory registered URL (set by the gateway monitor) so callers outside the
+ * monitor lifecycle can reuse the runtime-validated callback destination.
+ */
+export function resolveInteractionCallbackUrl(
+  accountId: string,
+  cfg?: InteractionCallbackConfig,
+): string {
+  const cached = callbackUrls.get(accountId);
+  if (cached) {
+    return cached;
+  }
+  return computeInteractionCallbackUrl(accountId, cfg);
+}
+
+// ── HMAC token management ──────────────────────────────────────────────
+// Secret is derived from the bot token so it's stable across CLI and gateway processes.
+
+const interactionSecrets = new Map<string, string>();
+let defaultInteractionSecret: string | undefined;
+
+function deriveInteractionSecret(botToken: string): string {
+  return createHmac("sha256", "openclaw-mattermost-interactions").update(botToken).digest("hex");
+}
+
+export function setInteractionSecret(accountIdOrBotToken: string, botToken?: string): void {
+  if (typeof botToken === "string") {
+    interactionSecrets.set(accountIdOrBotToken, deriveInteractionSecret(botToken));
+    return;
+  }
+  // Backward-compatible fallback for call sites/tests that only pass botToken.
+  defaultInteractionSecret = deriveInteractionSecret(accountIdOrBotToken);
+}
+
+export function getInteractionSecret(accountId?: string): string {
+  const scoped = accountId ? interactionSecrets.get(accountId) : undefined;
+  if (scoped) {
+    return scoped;
+  }
+  if (defaultInteractionSecret) {
+    return defaultInteractionSecret;
+  }
+  // Fallback for single-account runtimes that only registered scoped secrets.
+  if (interactionSecrets.size === 1) {
+    const first = interactionSecrets.values().next().value;
+    if (typeof first === "string") {
+      return first;
+    }
+  }
+  throw new Error(
+    "Interaction secret not initialized — call setInteractionSecret(accountId, botToken) first",
+  );
+}
+
+function canonicalizeInteractionContext(value: unknown): unknown {
+  if (Array.isArray(value)) {
+    return value.map((item) => canonicalizeInteractionContext(item));
+  }
+  if (value && typeof value === "object") {
+    const entries = Object.entries(value as Record<string, unknown>)
+      .filter(([, entryValue]) => entryValue !== undefined)
+      .sort(([left], [right]) => left.localeCompare(right))
+      .map(([key, entryValue]) => [key, canonicalizeInteractionContext(entryValue)]);
+    return Object.fromEntries(entries);
+  }
+  return value;
+}
+
+export function generateInteractionToken(
+  context: Record<string, unknown>,
+  accountId?: string,
+): string {
+  const secret = getInteractionSecret(accountId);
+  const payload = JSON.stringify(canonicalizeInteractionContext(context));
+  return createHmac("sha256", secret).update(payload).digest("hex");
+}
+
+export function verifyInteractionToken(
+  context: Record<string, unknown>,
+  token: string,
+  accountId?: string,
+): boolean {
+  const expected = generateInteractionToken(context, accountId);
+  return safeEqualSecret(expected, token);
+}
+
+// ── Button builder helpers ─────────────────────────────────────────────
+
+export type MattermostButton = {
+  id: string;
+  type: "button" | "select";
+  name: string;
+  style?: "default" | "primary" | "danger";
+  integration: {
+    url: string;
+    context: Record<string, unknown>;
+  };
+};
+
+export type MattermostAttachment = {
+  text?: string;
+  actions?: MattermostButton[];
+  [key: string]: unknown;
+};
+
+/**
+ * Build Mattermost `props.attachments` with interactive buttons.
+ *
+ * Each button includes an HMAC token in its integration context so the
+ * callback handler can verify the request originated from a legitimate
+ * button click (Mattermost's recommended security pattern).
+ */
+/**
+ * Sanitize a button ID so Mattermost's action router can match it.
+ * Mattermost uses the action ID in the URL path `/api/v4/posts/{id}/actions/{actionId}`
+ * and IDs containing hyphens or underscores break the server-side routing.
+ * See: https://github.com/mattermost/mattermost/issues/25747
+ */
+function sanitizeActionId(id: string): string {
+  return id.replace(/[-_]/g, "");
+}
+
+export function buildButtonAttachments(params: {
+  callbackUrl: string;
+  accountId?: string;
+  buttons: Array<{
+    id: string;
+    name: string;
+    style?: "default" | "primary" | "danger";
+    context?: Record<string, unknown>;
+  }>;
+  text?: string;
+}): MattermostAttachment[] {
+  const actions: MattermostButton[] = params.buttons.map((btn) => {
+    const safeId = sanitizeActionId(btn.id);
+    const context: Record<string, unknown> = {
+      action_id: safeId,
+      ...btn.context,
+    };
+    const token = generateInteractionToken(context, params.accountId);
+    return {
+      id: safeId,
+      type: "button" as const,
+      name: btn.name,
+      style: btn.style,
+      integration: {
+        url: params.callbackUrl,
+        context: {
+          ...context,
+          _token: token,
+        },
+      },
+    };
+  });
+
+  return [
+    {
+      text: params.text ?? "",
+      actions,
+    },
+  ];
+}
+
+export function buildButtonProps(params: {
+  callbackUrl: string;
+  accountId?: string;
+  channelId: string;
+  buttons: Array<unknown>;
+  text?: string;
+}): Record<string, unknown> | undefined {
+  const rawButtons = params.buttons.flatMap((item) =>
+    Array.isArray(item) ? item : [item],
+  ) as MattermostInteractiveButtonInput[];
+
+  const buttons = rawButtons
+    .map((btn) => ({
+      id: String(btn.id ?? btn.callback_data ?? "").trim(),
+      name: String(btn.text ?? btn.name ?? btn.label ?? "").trim(),
+      style: btn.style ?? "default",
+      context:
+        typeof btn.context === "object" && btn.context !== null
+          ? {
+              ...btn.context,
+              [SIGNED_CHANNEL_ID_CONTEXT_KEY]: params.channelId,
+            }
+          : { [SIGNED_CHANNEL_ID_CONTEXT_KEY]: params.channelId },
+    }))
+    .filter((btn) => btn.id && btn.name);
+
+  if (buttons.length === 0) {
+    return undefined;
+  }
+
+  return {
+    attachments: buildButtonAttachments({
+      callbackUrl: params.callbackUrl,
+      accountId: params.accountId,
+      buttons,
+      text: params.text,
+    }),
+  };
+}
+
+// ── Request body reader ────────────────────────────────────────────────
+
+function readInteractionBody(req: IncomingMessage): Promise<string> {
+  return new Promise((resolve, reject) => {
+    const chunks: Buffer[] = [];
+    let totalBytes = 0;
+
+    const timer = setTimeout(() => {
+      req.destroy();
+      reject(new Error("Request body read timeout"));
+    }, INTERACTION_BODY_TIMEOUT_MS);
+
+    req.on("data", (chunk: Buffer) => {
+      totalBytes += chunk.length;
+      if (totalBytes > INTERACTION_MAX_BODY_BYTES) {
+        req.destroy();
+        clearTimeout(timer);
+        reject(new Error("Request body too large"));
+        return;
+      }
+      chunks.push(chunk);
+    });
+
+    req.on("end", () => {
+      clearTimeout(timer);
+      resolve(Buffer.concat(chunks).toString("utf8"));
+    });
+
+    req.on("error", (err) => {
+      clearTimeout(timer);
+      reject(err);
+    });
+  });
+}
+
+// ── HTTP handler ───────────────────────────────────────────────────────
+
+export function createMattermostInteractionHandler(params: {
+  client: MattermostClient;
+  botUserId: string;
+  accountId: string;
+  allowedSourceIps?: string[];
+  trustedProxies?: string[];
+  allowRealIpFallback?: boolean;
+  resolveSessionKey?: (params: {
+    channelId: string;
+    userId: string;
+    post: MattermostPost;
+  }) => Promise<string>;
+  handleInteraction?: (opts: {
+    payload: MattermostInteractionPayload;
+    userName: string;
+    actionId: string;
+    actionName: string;
+    originalMessage: string;
+    context: Record<string, unknown>;
+    post: MattermostPost;
+  }) => Promise<MattermostInteractionResponse | null>;
+  authorizeButtonClick?: (opts: {
+    payload: MattermostInteractionPayload;
+    post: MattermostPost;
+  }) => Promise<MattermostInteractionAuthorizationResult>;
+  dispatchButtonClick?: (opts: {
+    channelId: string;
+    userId: string;
+    userName: string;
+    actionId: string;
+    actionName: string;
+    postId: string;
+    post: MattermostPost;
+  }) => Promise<void>;
+  log?: (message: string) => void;
+}): (req: IncomingMessage, res: ServerResponse) => Promise<void> {
+  const { client, accountId, log } = params;
+  const core = getMattermostRuntime();
+
+  return async (req: IncomingMessage, res: ServerResponse) => {
+    // Only accept POST
+    if (req.method !== "POST") {
+      res.statusCode = 405;
+      res.setHeader("Allow", "POST");
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Method Not Allowed" }));
+      return;
+    }
+
+    if (
+      !isAllowedInteractionSource({
+        req,
+        allowedSourceIps: params.allowedSourceIps,
+        trustedProxies: params.trustedProxies,
+        allowRealIpFallback: params.allowRealIpFallback,
+      })
+    ) {
+      log?.(
+        `mattermost interaction: rejected callback source remote=${req.socket?.remoteAddress ?? "?"}`,
+      );
+      res.statusCode = 403;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Forbidden origin" }));
+      return;
+    }
+
+    let payload: MattermostInteractionPayload;
+    try {
+      const raw = await readInteractionBody(req);
+      payload = JSON.parse(raw) as MattermostInteractionPayload;
+    } catch (err) {
+      log?.(`mattermost interaction: failed to parse body: ${String(err)}`);
+      res.statusCode = 400;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Invalid request body" }));
+      return;
+    }
+
+    const context = payload.context;
+    if (!context) {
+      res.statusCode = 400;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Missing context" }));
+      return;
+    }
+
+    // Verify HMAC token
+    const token = context._token;
+    if (typeof token !== "string") {
+      log?.("mattermost interaction: missing _token in context");
+      res.statusCode = 403;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Missing token" }));
+      return;
+    }
+
+    // Strip _token before verification (it wasn't in the original context)
+    const { _token, ...contextWithoutToken } = context;
+    if (!verifyInteractionToken(contextWithoutToken, token, accountId)) {
+      log?.("mattermost interaction: invalid _token");
+      res.statusCode = 403;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Invalid token" }));
+      return;
+    }
+
+    const actionId = context.action_id;
+    if (typeof actionId !== "string") {
+      res.statusCode = 400;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Missing action_id in context" }));
+      return;
+    }
+
+    const signedChannelId =
+      typeof contextWithoutToken[SIGNED_CHANNEL_ID_CONTEXT_KEY] === "string"
+        ? contextWithoutToken[SIGNED_CHANNEL_ID_CONTEXT_KEY].trim()
+        : "";
+    if (signedChannelId && signedChannelId !== payload.channel_id) {
+      log?.(
+        `mattermost interaction: signed channel mismatch payload=${payload.channel_id} signed=${signedChannelId}`,
+      );
+      res.statusCode = 403;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Channel mismatch" }));
+      return;
+    }
+
+    const userName = payload.user_name ?? payload.user_id;
+    let originalMessage = "";
+    let originalPost: MattermostPost | null = null;
+    let clickedButtonName: string | null = null;
+    try {
+      originalPost = await client.request<MattermostPost>(`/posts/${payload.post_id}`);
+      const postChannelId = originalPost.channel_id?.trim();
+      if (!postChannelId || postChannelId !== payload.channel_id) {
+        log?.(
+          `mattermost interaction: post channel mismatch payload=${payload.channel_id} post=${postChannelId ?? "<missing>"}`,
+        );
+        res.statusCode = 403;
+        res.setHeader("Content-Type", "application/json");
+        res.end(JSON.stringify({ error: "Post/channel mismatch" }));
+        return;
+      }
+      originalMessage = originalPost.message ?? "";
+
+      // Ensure the callback can only target an action that exists on the original post.
+      const postAttachments = Array.isArray(originalPost?.props?.attachments)
+        ? (originalPost.props.attachments as Array<{
+            actions?: Array<{ id?: string; name?: string }>;
+          }>)
+        : [];
+      for (const att of postAttachments) {
+        const match = att.actions?.find((a) => a.id === actionId);
+        if (match?.name) {
+          clickedButtonName = match.name;
+          break;
+        }
+      }
+      if (clickedButtonName === null) {
+        log?.(`mattermost interaction: action ${actionId} not found in post ${payload.post_id}`);
+        res.statusCode = 403;
+        res.setHeader("Content-Type", "application/json");
+        res.end(JSON.stringify({ error: "Unknown action" }));
+        return;
+      }
+    } catch (err) {
+      log?.(`mattermost interaction: failed to validate post ${payload.post_id}: ${String(err)}`);
+      res.statusCode = 500;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Failed to validate interaction" }));
+      return;
+    }
+
+    if (!originalPost) {
+      log?.(`mattermost interaction: missing fetched post ${payload.post_id}`);
+      res.statusCode = 500;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Failed to load interaction post" }));
+      return;
+    }
+
+    log?.(
+      `mattermost interaction: action=${actionId} user=${payload.user_name ?? payload.user_id} ` +
+        `post=${payload.post_id} channel=${payload.channel_id}`,
+    );
+
+    if (params.authorizeButtonClick) {
+      try {
+        const authorization = await params.authorizeButtonClick({
+          payload,
+          post: originalPost,
+        });
+        if (!authorization.ok) {
+          res.statusCode = authorization.statusCode ?? 200;
+          res.setHeader("Content-Type", "application/json");
+          res.end(
+            JSON.stringify(
+              authorization.response ?? {
+                ephemeral_text: "You are not allowed to use this action here.",
+              },
+            ),
+          );
+          return;
+        }
+      } catch (err) {
+        log?.(`mattermost interaction: authorization failed: ${String(err)}`);
+        res.statusCode = 500;
+        res.setHeader("Content-Type", "application/json");
+        res.end(JSON.stringify({ error: "Interaction authorization failed" }));
+        return;
+      }
+    }
+
+    if (params.handleInteraction) {
+      try {
+        const response = await params.handleInteraction({
+          payload,
+          userName,
+          actionId,
+          actionName: clickedButtonName,
+          originalMessage,
+          context: contextWithoutToken,
+          post: originalPost,
+        });
+        if (response !== null) {
+          res.statusCode = 200;
+          res.setHeader("Content-Type", "application/json");
+          res.end(JSON.stringify(response));
+          return;
+        }
+      } catch (err) {
+        log?.(`mattermost interaction: custom handler failed: ${String(err)}`);
+        res.statusCode = 500;
+        res.setHeader("Content-Type", "application/json");
+        res.end(JSON.stringify({ error: "Interaction handler failed" }));
+        return;
+      }
+    }
+
+    // Dispatch as system event so the agent can handle it.
+    // Wrapped in try/catch — the post update below must still run even if
+    // system event dispatch fails (e.g. missing sessionKey or channel lookup).
+    try {
+      const eventLabel =
+        `Mattermost button click: action="${actionId}" ` +
+        `by ${payload.user_name ?? payload.user_id} ` +
+        `in channel ${payload.channel_id}`;
+
+      const sessionKey = params.resolveSessionKey
+        ? await params.resolveSessionKey({
+            channelId: payload.channel_id,
+            userId: payload.user_id,
+            post: originalPost,
+          })
+        : `agent:main:mattermost:${accountId}:${payload.channel_id}`;
+
+      core.system.enqueueSystemEvent(eventLabel, {
+        sessionKey,
+        contextKey: `mattermost:interaction:${payload.post_id}:${actionId}`,
+      });
+    } catch (err) {
+      log?.(`mattermost interaction: system event dispatch failed: ${String(err)}`);
+    }
+
+    // Update the post via API to replace buttons with a completion indicator.
+    try {
+      await updateMattermostPost(client, payload.post_id, {
+        message: originalMessage,
+        props: {
+          attachments: [
+            {
+              text: `✓ **${clickedButtonName}** selected by @${userName}`,
+            },
+          ],
+        },
+      });
+    } catch (err) {
+      log?.(`mattermost interaction: failed to update post ${payload.post_id}: ${String(err)}`);
+    }
+
+    // Respond with empty JSON — the post update is handled above
+    res.statusCode = 200;
+    res.setHeader("Content-Type", "application/json");
+    res.end("{}");
+
+    // Dispatch a synthetic inbound message so the agent responds to the button click.
+    if (params.dispatchButtonClick) {
+      try {
+        await params.dispatchButtonClick({
+          channelId: payload.channel_id,
+          userId: payload.user_id,
+          userName,
+          actionId,
+          actionName: clickedButtonName,
+          postId: payload.post_id,
+          post: originalPost,
+        });
+      } catch (err) {
+        log?.(`mattermost interaction: dispatchButtonClick failed: ${String(err)}`);
+      }
+    }
+  };
+}

extensions/mattermost/src/mattermost/model-picker.test.ts

@@ -0,0 +1,175 @@
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+import type { OpenClawConfig } from "../../runtime-api.js";
+import {
+  buildMattermostAllowedModelRefs,
+  parseMattermostModelPickerContext,
+  renderMattermostModelSummaryView,
+  renderMattermostModelsPickerView,
+  renderMattermostProviderPickerView,
+  resolveMattermostModelPickerCurrentModel,
+  resolveMattermostModelPickerEntry,
+} from "./model-picker.js";
+
+const data = {
+  byProvider: new Map<string, Set<string>>([
+    ["anthropic", new Set(["claude-opus-4-5", "claude-sonnet-4-5"])],
+    ["openai", new Set(["gpt-4.1", "gpt-5"])],
+  ]),
+  providers: ["anthropic", "openai"],
+  resolvedDefault: {
+    provider: "anthropic",
+    model: "claude-opus-4-5",
+  },
+  modelNames: new Map<string, string>(),
+};
+
+describe("Mattermost model picker", () => {
+  it("resolves bare /model and /models entry points", () => {
+    expect(resolveMattermostModelPickerEntry("/model")).toEqual({ kind: "summary" });
+    expect(resolveMattermostModelPickerEntry("/models")).toEqual({ kind: "providers" });
+    expect(resolveMattermostModelPickerEntry("/models OpenAI")).toEqual({
+      kind: "models",
+      provider: "openai",
+    });
+    expect(resolveMattermostModelPickerEntry("/model openai/gpt-5")).toBeNull();
+  });
+
+  it("builds the allowed model refs set", () => {
+    expect(buildMattermostAllowedModelRefs(data)).toEqual(
+      new Set([
+        "anthropic/claude-opus-4-5",
+        "anthropic/claude-sonnet-4-5",
+        "openai/gpt-4.1",
+        "openai/gpt-5",
+      ]),
+    );
+  });
+
+  it("renders the summary view with a browse button", () => {
+    const view = renderMattermostModelSummaryView({
+      ownerUserId: "user-1",
+      currentModel: "openai/gpt-5",
+    });
+
+    expect(view.text).toContain("Current: openai/gpt-5");
+    expect(view.text).toContain("Tap below to browse models");
+    expect(view.text).toContain("/oc_model <provider/model> to switch");
+    expect(view.buttons[0]?.[0]?.text).toBe("Browse providers");
+  });
+
+  it("trims accidental model spacing in Mattermost current-model text", () => {
+    const view = renderMattermostModelSummaryView({
+      ownerUserId: "user-1",
+      currentModel: " OpenAI/ gpt-5 ",
+    });
+
+    expect(view.text).toContain("Current: openai/gpt-5");
+  });
+
+  it("renders providers and models with Telegram-style navigation", () => {
+    const providersView = renderMattermostProviderPickerView({
+      ownerUserId: "user-1",
+      data,
+      currentModel: "openai/gpt-5",
+    });
+    const providerTexts = providersView.buttons.flat().map((button) => button.text);
+    expect(providerTexts).toContain("anthropic (2)");
+    expect(providerTexts).toContain("openai (2)");
+
+    const modelsView = renderMattermostModelsPickerView({
+      ownerUserId: "user-1",
+      data,
+      provider: "openai",
+      page: 1,
+      currentModel: "openai/gpt-5",
+    });
+    const modelTexts = modelsView.buttons.flat().map((button) => button.text);
+    expect(modelsView.text).toContain("Models (openai) - 2 available");
+    expect(modelTexts).toContain("gpt-5 [current]");
+    expect(modelTexts).toContain("Back to providers");
+  });
+
+  it("renders unique alphanumeric action ids per button", () => {
+    const modelsView = renderMattermostModelsPickerView({
+      ownerUserId: "user-1",
+      data,
+      provider: "openai",
+      page: 1,
+      currentModel: "openai/gpt-5",
+    });
+
+    const ids = modelsView.buttons.flat().map((button) => button.id);
+    expect(ids.every((id) => typeof id === "string" && /^[a-z0-9]+$/.test(id))).toBe(true);
+    expect(new Set(ids).size).toBe(ids.length);
+  });
+
+  it("parses signed picker contexts", () => {
+    expect(
+      parseMattermostModelPickerContext({
+        oc_model_picker: true,
+        action: "select",
+        ownerUserId: "user-1",
+        provider: "openai",
+        page: 2,
+        model: "gpt-5",
+      }),
+    ).toEqual({
+      action: "select",
+      ownerUserId: "user-1",
+      provider: "openai",
+      page: 2,
+      model: "gpt-5",
+    });
+    expect(parseMattermostModelPickerContext({ action: "select" })).toBeNull();
+  });
+
+  it("falls back to the routed agent default model when no override is stored", async () => {
+    const testDir = fs.mkdtempSync(path.join(os.tmpdir(), "mm-model-picker-"));
+    try {
+      const cfg: OpenClawConfig = {
+        session: {
+          store: path.join(testDir, "{agentId}.json"),
+        },
+        agents: {
+          defaults: {
+            model: "anthropic/claude-opus-4-5",
+          },
+          list: [
+            {
+              id: "support",
+              model: "openai/gpt-5",
+            },
+          ],
+        },
+      };
+      const providerData = {
+        byProvider: new Map<string, Set<string>>([
+          ["anthropic", new Set(["claude-opus-4-5"])],
+          ["openai", new Set(["gpt-5"])],
+        ]),
+        providers: ["anthropic", "openai"],
+        resolvedDefault: {
+          provider: "openai",
+          model: "gpt-5",
+        },
+        modelNames: new Map<string, string>(),
+      };
+
+      expect(
+        resolveMattermostModelPickerCurrentModel({
+          cfg,
+          route: {
+            agentId: "support",
+            sessionKey: "agent:support:main",
+          },
+          data: providerData,
+        }),
+      ).toBe("openai/gpt-5");
+    } finally {
+      fs.rmSync(testDir, { recursive: true, force: true });
+    }
+  });
+});

extensions/mattermost/src/mattermost/model-picker.ts

@@ -0,0 +1,382 @@
+import { createHash } from "node:crypto";
+import type { MattermostInteractiveButtonInput } from "./interactions.js";
+import {
+  loadSessionStore,
+  normalizeProviderId,
+  resolveStorePath,
+  resolveStoredModelOverride,
+  type ModelsProviderData,
+  type OpenClawConfig,
+} from "./runtime-api.js";
+
+const MATTERMOST_MODEL_PICKER_CONTEXT_KEY = "oc_model_picker";
+const MODELS_PAGE_SIZE = 8;
+const ACTION_IDS = {
+  providers: "mdlprov",
+  list: "mdllist",
+  select: "mdlsel",
+  back: "mdlback",
+} as const;
+
+export type MattermostModelPickerEntry =
+  | { kind: "summary" }
+  | { kind: "providers" }
+  | { kind: "models"; provider: string };
+
+export type MattermostModelPickerState =
+  | { action: "providers"; ownerUserId: string }
+  | { action: "back"; ownerUserId: string }
+  | { action: "list"; ownerUserId: string; provider: string; page: number }
+  | { action: "select"; ownerUserId: string; provider: string; page: number; model: string };
+
+export type MattermostModelPickerRenderedView = {
+  text: string;
+  buttons: MattermostInteractiveButtonInput[][];
+};
+
+function splitModelRef(modelRef?: string | null): { provider: string; model: string } | null {
+  const trimmed = modelRef?.trim();
+  const match = trimmed?.match(/^([^/]+)\/(.+)$/u);
+  if (!match) {
+    return null;
+  }
+  const provider = normalizeProviderId(match[1]);
+  // Mattermost copy should normalize accidental whitespace around the model.
+  const model = match[2].trim();
+  if (!provider || !model) {
+    return null;
+  }
+  return { provider, model };
+}
+
+function normalizePage(value: number | undefined): number {
+  if (!Number.isFinite(value)) {
+    return 1;
+  }
+  return Math.max(1, Math.floor(value as number));
+}
+
+function paginateItems<T>(items: T[], page?: number, pageSize = MODELS_PAGE_SIZE) {
+  const totalPages = Math.max(1, Math.ceil(items.length / pageSize));
+  const safePage = Math.max(1, Math.min(normalizePage(page), totalPages));
+  const start = (safePage - 1) * pageSize;
+  return {
+    items: items.slice(start, start + pageSize),
+    page: safePage,
+    totalPages,
+    hasPrev: safePage > 1,
+    hasNext: safePage < totalPages,
+    totalItems: items.length,
+  };
+}
+
+function buildContext(state: MattermostModelPickerState): Record<string, unknown> {
+  return {
+    [MATTERMOST_MODEL_PICKER_CONTEXT_KEY]: true,
+    ...state,
+  };
+}
+
+function buildButtonId(state: MattermostModelPickerState): string {
+  const digest = createHash("sha256").update(JSON.stringify(state)).digest("hex").slice(0, 12);
+  return `${ACTION_IDS[state.action]}${digest}`;
+}
+
+function buildButton(params: {
+  action: MattermostModelPickerState["action"];
+  ownerUserId: string;
+  text: string;
+  provider?: string;
+  page?: number;
+  model?: string;
+  style?: "default" | "primary" | "danger";
+}): MattermostInteractiveButtonInput {
+  const baseState =
+    params.action === "providers" || params.action === "back"
+      ? {
+          action: params.action,
+          ownerUserId: params.ownerUserId,
+        }
+      : params.action === "list"
+        ? {
+            action: "list" as const,
+            ownerUserId: params.ownerUserId,
+            provider: normalizeProviderId(params.provider ?? ""),
+            page: normalizePage(params.page),
+          }
+        : {
+            action: "select" as const,
+            ownerUserId: params.ownerUserId,
+            provider: normalizeProviderId(params.provider ?? ""),
+            page: normalizePage(params.page),
+            model: String(params.model ?? "").trim(),
+          };
+
+  return {
+    // Mattermost requires action IDs to be unique within a post.
+    id: buildButtonId(baseState),
+    text: params.text,
+    ...(params.style ? { style: params.style } : {}),
+    context: buildContext(baseState),
+  };
+}
+
+function getProviderModels(data: ModelsProviderData, provider: string): string[] {
+  return [...(data.byProvider.get(normalizeProviderId(provider)) ?? new Set<string>())].sort();
+}
+
+function formatCurrentModelLine(currentModel?: string): string {
+  const parsed = splitModelRef(currentModel);
+  if (!parsed) {
+    return "Current: default";
+  }
+  return `Current: ${parsed.provider}/${parsed.model}`;
+}
+
+export function resolveMattermostModelPickerEntry(
+  commandText: string,
+): MattermostModelPickerEntry | null {
+  const normalized = commandText.trim().replace(/\s+/g, " ");
+  if (/^\/model$/i.test(normalized)) {
+    return { kind: "summary" };
+  }
+  if (/^\/models$/i.test(normalized)) {
+    return { kind: "providers" };
+  }
+  const providerMatch = normalized.match(/^\/models\s+(\S+)$/i);
+  if (!providerMatch?.[1]) {
+    return null;
+  }
+  return {
+    kind: "models",
+    provider: normalizeProviderId(providerMatch[1]),
+  };
+}
+
+export function parseMattermostModelPickerContext(
+  context: Record<string, unknown>,
+): MattermostModelPickerState | null {
+  if (!context || context[MATTERMOST_MODEL_PICKER_CONTEXT_KEY] !== true) {
+    return null;
+  }
+
+  const ownerUserId = String(context.ownerUserId ?? "").trim();
+  const action = String(context.action ?? "").trim();
+  if (!ownerUserId) {
+    return null;
+  }
+
+  if (action === "providers" || action === "back") {
+    return { action, ownerUserId };
+  }
+
+  const provider = normalizeProviderId(String(context.provider ?? ""));
+  const page = Number.parseInt(String(context.page ?? "1"), 10);
+  if (!provider) {
+    return null;
+  }
+
+  if (action === "list") {
+    return {
+      action,
+      ownerUserId,
+      provider,
+      page: normalizePage(page),
+    };
+  }
+
+  if (action === "select") {
+    const model = String(context.model ?? "").trim();
+    if (!model) {
+      return null;
+    }
+    return {
+      action,
+      ownerUserId,
+      provider,
+      page: normalizePage(page),
+      model,
+    };
+  }
+
+  return null;
+}
+
+export function buildMattermostAllowedModelRefs(data: ModelsProviderData): Set<string> {
+  const refs = new Set<string>();
+  for (const provider of data.providers) {
+    for (const model of data.byProvider.get(provider) ?? []) {
+      refs.add(`${provider}/${model}`);
+    }
+  }
+  return refs;
+}
+
+export function resolveMattermostModelPickerCurrentModel(params: {
+  cfg: OpenClawConfig;
+  route: { agentId: string; sessionKey: string };
+  data: ModelsProviderData;
+  skipCache?: boolean;
+}): string {
+  const fallback = `${params.data.resolvedDefault.provider}/${params.data.resolvedDefault.model}`;
+  try {
+    const storePath = resolveStorePath(params.cfg.session?.store, {
+      agentId: params.route.agentId,
+    });
+    const sessionStore = params.skipCache
+      ? loadSessionStore(storePath, { skipCache: true })
+      : loadSessionStore(storePath);
+    const sessionEntry = sessionStore[params.route.sessionKey];
+    const override = resolveStoredModelOverride({
+      sessionEntry,
+      sessionStore,
+      sessionKey: params.route.sessionKey,
+      defaultProvider: params.data.resolvedDefault.provider,
+    });
+    if (!override?.model) {
+      return fallback;
+    }
+    const provider = (override.provider || params.data.resolvedDefault.provider).trim();
+    return provider ? `${provider}/${override.model}` : fallback;
+  } catch {
+    return fallback;
+  }
+}
+
+export function renderMattermostModelSummaryView(params: {
+  ownerUserId: string;
+  currentModel?: string;
+}): MattermostModelPickerRenderedView {
+  return {
+    text: [
+      formatCurrentModelLine(params.currentModel),
+      "",
+      "Tap below to browse models, or use:",
+      "/oc_model <provider/model> to switch",
+      "/oc_model status for details",
+    ].join("\n"),
+    buttons: [
+      [
+        buildButton({
+          action: "providers",
+          ownerUserId: params.ownerUserId,
+          text: "Browse providers",
+          style: "primary",
+        }),
+      ],
+    ],
+  };
+}
+
+export function renderMattermostProviderPickerView(params: {
+  ownerUserId: string;
+  data: ModelsProviderData;
+  currentModel?: string;
+}): MattermostModelPickerRenderedView {
+  const currentProvider = splitModelRef(params.currentModel)?.provider;
+  const rows = params.data.providers.map((provider) => [
+    buildButton({
+      action: "list",
+      ownerUserId: params.ownerUserId,
+      text: `${provider} (${params.data.byProvider.get(provider)?.size ?? 0})`,
+      provider,
+      page: 1,
+      style: provider === currentProvider ? "primary" : "default",
+    }),
+  ]);
+
+  return {
+    text: [formatCurrentModelLine(params.currentModel), "", "Select a provider:"].join("\n"),
+    buttons: rows,
+  };
+}
+
+export function renderMattermostModelsPickerView(params: {
+  ownerUserId: string;
+  data: ModelsProviderData;
+  provider: string;
+  page?: number;
+  currentModel?: string;
+}): MattermostModelPickerRenderedView {
+  const provider = normalizeProviderId(params.provider);
+  const models = getProviderModels(params.data, provider);
+  const current = splitModelRef(params.currentModel);
+
+  if (models.length === 0) {
+    return {
+      text: [formatCurrentModelLine(params.currentModel), "", `Unknown provider: ${provider}`].join(
+        "\n",
+      ),
+      buttons: [
+        [
+          buildButton({
+            action: "back",
+            ownerUserId: params.ownerUserId,
+            text: "Back to providers",
+          }),
+        ],
+      ],
+    };
+  }
+
+  const page = paginateItems(models, params.page);
+  const rows: MattermostInteractiveButtonInput[][] = page.items.map((model) => {
+    const isCurrent = current?.provider === provider && current.model === model;
+    return [
+      buildButton({
+        action: "select",
+        ownerUserId: params.ownerUserId,
+        text: isCurrent ? `${model} [current]` : model,
+        provider,
+        model,
+        page: page.page,
+        style: isCurrent ? "primary" : "default",
+      }),
+    ];
+  });
+
+  const navRow: MattermostInteractiveButtonInput[] = [];
+  if (page.hasPrev) {
+    navRow.push(
+      buildButton({
+        action: "list",
+        ownerUserId: params.ownerUserId,
+        text: "Prev",
+        provider,
+        page: page.page - 1,
+      }),
+    );
+  }
+  if (page.hasNext) {
+    navRow.push(
+      buildButton({
+        action: "list",
+        ownerUserId: params.ownerUserId,
+        text: "Next",
+        provider,
+        page: page.page + 1,
+      }),
+    );
+  }
+  if (navRow.length > 0) {
+    rows.push(navRow);
+  }
+
+  rows.push([
+    buildButton({
+      action: "back",
+      ownerUserId: params.ownerUserId,
+      text: "Back to providers",
+    }),
+  ]);
+
+  return {
+    text: [
+      `Models (${provider}) - ${page.totalItems} available`,
+      formatCurrentModelLine(params.currentModel),
+      `Page ${page.page}/${page.totalPages}`,
+      "Select a model to switch immediately.",
+    ].join("\n"),
+    buttons: rows,
+  };
+}

extensions/mattermost/src/mattermost/monitor-auth.test.ts

@@ -0,0 +1,165 @@
+import { beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+
+const evaluateSenderGroupAccessForPolicy = vi.hoisted(() => vi.fn());
+const isDangerousNameMatchingEnabled = vi.hoisted(() => vi.fn());
+const resolveAllowlistMatchSimple = vi.hoisted(() => vi.fn());
+const resolveControlCommandGate = vi.hoisted(() => vi.fn());
+const resolveEffectiveAllowFromLists = vi.hoisted(() => vi.fn());
+
+vi.mock("./runtime-api.js", () => ({
+  evaluateSenderGroupAccessForPolicy,
+  isDangerousNameMatchingEnabled,
+  resolveAllowlistMatchSimple,
+  resolveControlCommandGate,
+  resolveEffectiveAllowFromLists,
+}));
+
+describe("mattermost monitor auth", () => {
+  let authorizeMattermostCommandInvocation: typeof import("./monitor-auth.js").authorizeMattermostCommandInvocation;
+  let isMattermostSenderAllowed: typeof import("./monitor-auth.js").isMattermostSenderAllowed;
+  let normalizeMattermostAllowEntry: typeof import("./monitor-auth.js").normalizeMattermostAllowEntry;
+  let normalizeMattermostAllowList: typeof import("./monitor-auth.js").normalizeMattermostAllowList;
+  let resolveMattermostEffectiveAllowFromLists: typeof import("./monitor-auth.js").resolveMattermostEffectiveAllowFromLists;
+
+  beforeAll(async () => {
+    ({
+      authorizeMattermostCommandInvocation,
+      isMattermostSenderAllowed,
+      normalizeMattermostAllowEntry,
+      normalizeMattermostAllowList,
+      resolveMattermostEffectiveAllowFromLists,
+    } = await import("./monitor-auth.js"));
+  });
+
+  beforeEach(() => {
+    evaluateSenderGroupAccessForPolicy.mockReset();
+    isDangerousNameMatchingEnabled.mockReset();
+    resolveAllowlistMatchSimple.mockReset();
+    resolveControlCommandGate.mockReset();
+    resolveEffectiveAllowFromLists.mockReset();
+  });
+
+  it("normalizes allowlist entries and resolves effective lists", () => {
+    resolveEffectiveAllowFromLists.mockReturnValue({
+      effectiveAllowFrom: ["alice"],
+      effectiveGroupAllowFrom: ["team"],
+    });
+
+    expect(normalizeMattermostAllowEntry(" @Alice ")).toBe("alice");
+    expect(normalizeMattermostAllowEntry("mattermost:Bob")).toBe("bob");
+    expect(normalizeMattermostAllowEntry("*")).toBe("*");
+    expect(normalizeMattermostAllowList([" Alice ", "user:alice", "ALICE", "*"])).toEqual([
+      "alice",
+      "*",
+    ]);
+    expect(
+      resolveMattermostEffectiveAllowFromLists({
+        allowFrom: [" Alice "],
+        groupAllowFrom: [" Team "],
+        storeAllowFrom: ["Store"],
+        dmPolicy: "pairing",
+      }),
+    ).toEqual({
+      effectiveAllowFrom: ["alice"],
+      effectiveGroupAllowFrom: ["team"],
+    });
+    expect(resolveEffectiveAllowFromLists).toHaveBeenCalledWith({
+      allowFrom: ["alice"],
+      groupAllowFrom: ["team"],
+      storeAllowFrom: ["store"],
+      dmPolicy: "pairing",
+    });
+  });
+
+  it("checks sender allowlists against normalized ids and names", () => {
+    resolveAllowlistMatchSimple.mockReturnValue({ allowed: true });
+    expect(
+      isMattermostSenderAllowed({
+        senderId: "@Alice",
+        senderName: "Alice",
+        allowFrom: [" mattermost:alice "],
+        allowNameMatching: true,
+      }),
+    ).toBe(true);
+    expect(resolveAllowlistMatchSimple).toHaveBeenCalledWith({
+      allowFrom: ["alice"],
+      senderId: "alice",
+      senderName: "alice",
+      allowNameMatching: true,
+    });
+  });
+
+  it("authorizes direct messages in open mode and blocks disabled/group-restricted channels", async () => {
+    isDangerousNameMatchingEnabled.mockReturnValue(false);
+    resolveEffectiveAllowFromLists.mockReturnValue({
+      effectiveAllowFrom: [],
+      effectiveGroupAllowFrom: [],
+    });
+    resolveControlCommandGate.mockReturnValue({
+      commandAuthorized: false,
+      shouldBlock: false,
+    });
+    evaluateSenderGroupAccessForPolicy.mockReturnValue({
+      allowed: false,
+      reason: "empty_allowlist",
+    });
+    resolveAllowlistMatchSimple.mockReturnValue({ allowed: false });
+
+    expect(
+      authorizeMattermostCommandInvocation({
+        account: {
+          config: { dmPolicy: "open" },
+        } as never,
+        cfg: {} as never,
+        senderId: "alice",
+        senderName: "Alice",
+        channelId: "dm-1",
+        channelInfo: { type: "D", name: "alice", display_name: "Alice" } as never,
+        allowTextCommands: false,
+        hasControlCommand: false,
+      }),
+    ).toMatchObject({
+      ok: true,
+      commandAuthorized: true,
+      kind: "direct",
+      roomLabel: "#alice",
+    });
+
+    expect(
+      authorizeMattermostCommandInvocation({
+        account: {
+          config: { dmPolicy: "disabled" },
+        } as never,
+        cfg: {} as never,
+        senderId: "alice",
+        senderName: "Alice",
+        channelId: "dm-1",
+        channelInfo: { type: "D", name: "alice", display_name: "Alice" } as never,
+        allowTextCommands: false,
+        hasControlCommand: false,
+      }),
+    ).toMatchObject({
+      ok: false,
+      denyReason: "dm-disabled",
+    });
+
+    expect(
+      authorizeMattermostCommandInvocation({
+        account: {
+          config: { groupPolicy: "allowlist" },
+        } as never,
+        cfg: {} as never,
+        senderId: "alice",
+        senderName: "Alice",
+        channelId: "chan-1",
+        channelInfo: { type: "O", name: "town-square", display_name: "Town Square" } as never,
+        allowTextCommands: true,
+        hasControlCommand: false,
+      }),
+    ).toMatchObject({
+      ok: false,
+      denyReason: "channel-no-allowlist",
+      kind: "channel",
+    });
+  });
+});

extensions/mattermost/src/mattermost/monitor-auth.ts

@@ -0,0 +1,315 @@
+import type { ResolvedMattermostAccount } from "./accounts.js";
+import type { MattermostChannel } from "./client.js";
+import type { OpenClawConfig } from "./runtime-api.js";
+import {
+  evaluateSenderGroupAccessForPolicy,
+  isDangerousNameMatchingEnabled,
+  resolveAllowlistMatchSimple,
+  resolveControlCommandGate,
+  resolveEffectiveAllowFromLists,
+} from "./runtime-api.js";
+
+export function normalizeMattermostAllowEntry(entry: string): string {
+  const trimmed = entry.trim();
+  if (!trimmed) {
+    return "";
+  }
+  if (trimmed === "*") {
+    return "*";
+  }
+  return trimmed
+    .replace(/^(mattermost|user):/i, "")
+    .replace(/^@/, "")
+    .toLowerCase();
+}
+
+export function normalizeMattermostAllowList(entries: Array<string | number>): string[] {
+  const normalized = entries
+    .map((entry) => normalizeMattermostAllowEntry(String(entry)))
+    .filter(Boolean);
+  return Array.from(new Set(normalized));
+}
+
+export function resolveMattermostEffectiveAllowFromLists(params: {
+  allowFrom?: Array<string | number> | null;
+  groupAllowFrom?: Array<string | number> | null;
+  storeAllowFrom?: Array<string | number> | null;
+  dmPolicy?: string | null;
+}): {
+  effectiveAllowFrom: string[];
+  effectiveGroupAllowFrom: string[];
+} {
+  return resolveEffectiveAllowFromLists({
+    allowFrom: normalizeMattermostAllowList(params.allowFrom ?? []),
+    groupAllowFrom: normalizeMattermostAllowList(params.groupAllowFrom ?? []),
+    storeAllowFrom: normalizeMattermostAllowList(params.storeAllowFrom ?? []),
+    dmPolicy: params.dmPolicy,
+  });
+}
+
+export function isMattermostSenderAllowed(params: {
+  senderId: string;
+  senderName?: string;
+  allowFrom: string[];
+  allowNameMatching?: boolean;
+}): boolean {
+  const allowFrom = normalizeMattermostAllowList(params.allowFrom);
+  if (allowFrom.length === 0) {
+    return false;
+  }
+  const match = resolveAllowlistMatchSimple({
+    allowFrom,
+    senderId: normalizeMattermostAllowEntry(params.senderId),
+    senderName: params.senderName ? normalizeMattermostAllowEntry(params.senderName) : undefined,
+    allowNameMatching: params.allowNameMatching,
+  });
+  return match.allowed;
+}
+
+function mapMattermostChannelKind(channelType?: string | null): "direct" | "group" | "channel" {
+  const normalized = channelType?.trim().toUpperCase();
+  if (normalized === "D") {
+    return "direct";
+  }
+  if (normalized === "G" || normalized === "P") {
+    return "group";
+  }
+  return "channel";
+}
+
+export type MattermostCommandAuthDecision =
+  | {
+      ok: true;
+      commandAuthorized: boolean;
+      channelInfo: MattermostChannel;
+      kind: "direct" | "group" | "channel";
+      chatType: "direct" | "group" | "channel";
+      channelName: string;
+      channelDisplay: string;
+      roomLabel: string;
+    }
+  | {
+      ok: false;
+      denyReason:
+        | "unknown-channel"
+        | "dm-disabled"
+        | "dm-pairing"
+        | "unauthorized"
+        | "channels-disabled"
+        | "channel-no-allowlist";
+      commandAuthorized: false;
+      channelInfo: MattermostChannel | null;
+      kind: "direct" | "group" | "channel";
+      chatType: "direct" | "group" | "channel";
+      channelName: string;
+      channelDisplay: string;
+      roomLabel: string;
+    };
+
+export function authorizeMattermostCommandInvocation(params: {
+  account: ResolvedMattermostAccount;
+  cfg: OpenClawConfig;
+  senderId: string;
+  senderName: string;
+  channelId: string;
+  channelInfo: MattermostChannel | null;
+  storeAllowFrom?: Array<string | number> | null;
+  allowTextCommands: boolean;
+  hasControlCommand: boolean;
+}): MattermostCommandAuthDecision {
+  const {
+    account,
+    cfg,
+    senderId,
+    senderName,
+    channelId,
+    channelInfo,
+    storeAllowFrom,
+    allowTextCommands,
+    hasControlCommand,
+  } = params;
+
+  if (!channelInfo) {
+    return {
+      ok: false,
+      denyReason: "unknown-channel",
+      commandAuthorized: false,
+      channelInfo: null,
+      kind: "channel",
+      chatType: "channel",
+      channelName: "",
+      channelDisplay: "",
+      roomLabel: `#${channelId}`,
+    };
+  }
+
+  const kind = mapMattermostChannelKind(channelInfo.type);
+  const chatType = kind;
+  const channelName = channelInfo.name ?? "";
+  const channelDisplay = channelInfo.display_name ?? channelName;
+  const roomLabel = channelName ? `#${channelName}` : channelDisplay || `#${channelId}`;
+
+  const dmPolicy = account.config.dmPolicy ?? "pairing";
+  const defaultGroupPolicy = cfg.channels?.defaults?.groupPolicy;
+  const groupPolicy = account.config.groupPolicy ?? defaultGroupPolicy ?? "allowlist";
+  const allowNameMatching = isDangerousNameMatchingEnabled(account.config);
+  const configAllowFrom = normalizeMattermostAllowList(account.config.allowFrom ?? []);
+  const configGroupAllowFrom = normalizeMattermostAllowList(account.config.groupAllowFrom ?? []);
+  const normalizedStoreAllowFrom = normalizeMattermostAllowList(storeAllowFrom ?? []);
+  const { effectiveAllowFrom, effectiveGroupAllowFrom } = resolveMattermostEffectiveAllowFromLists({
+    allowFrom: configAllowFrom,
+    groupAllowFrom: configGroupAllowFrom,
+    storeAllowFrom: normalizedStoreAllowFrom,
+    dmPolicy,
+  });
+
+  const useAccessGroups = cfg.commands?.useAccessGroups !== false;
+  const commandDmAllowFrom = kind === "direct" ? effectiveAllowFrom : configAllowFrom;
+  const commandGroupAllowFrom =
+    kind === "direct"
+      ? effectiveGroupAllowFrom
+      : configGroupAllowFrom.length > 0
+        ? configGroupAllowFrom
+        : configAllowFrom;
+
+  const senderAllowedForCommands = isMattermostSenderAllowed({
+    senderId,
+    senderName,
+    allowFrom: commandDmAllowFrom,
+    allowNameMatching,
+  });
+  const groupAllowedForCommands = isMattermostSenderAllowed({
+    senderId,
+    senderName,
+    allowFrom: commandGroupAllowFrom,
+    allowNameMatching,
+  });
+
+  const commandGate = resolveControlCommandGate({
+    useAccessGroups,
+    authorizers: [
+      { configured: commandDmAllowFrom.length > 0, allowed: senderAllowedForCommands },
+      {
+        configured: commandGroupAllowFrom.length > 0,
+        allowed: groupAllowedForCommands,
+      },
+    ],
+    allowTextCommands,
+    hasControlCommand: allowTextCommands && hasControlCommand,
+  });
+
+  const commandAuthorized =
+    kind === "direct"
+      ? dmPolicy === "open" || senderAllowedForCommands
+      : commandGate.commandAuthorized;
+
+  if (kind === "direct") {
+    if (dmPolicy === "disabled") {
+      return {
+        ok: false,
+        denyReason: "dm-disabled",
+        commandAuthorized: false,
+        channelInfo,
+        kind,
+        chatType,
+        channelName,
+        channelDisplay,
+        roomLabel,
+      };
+    }
+
+    if (dmPolicy !== "open" && !senderAllowedForCommands) {
+      return {
+        ok: false,
+        denyReason: dmPolicy === "pairing" ? "dm-pairing" : "unauthorized",
+        commandAuthorized: false,
+        channelInfo,
+        kind,
+        chatType,
+        channelName,
+        channelDisplay,
+        roomLabel,
+      };
+    }
+  } else {
+    const senderGroupAccess = evaluateSenderGroupAccessForPolicy({
+      groupPolicy,
+      groupAllowFrom: effectiveGroupAllowFrom,
+      senderId,
+      isSenderAllowed: (_senderId, allowFrom) =>
+        isMattermostSenderAllowed({
+          senderId,
+          senderName,
+          allowFrom,
+          allowNameMatching,
+        }),
+    });
+
+    if (!senderGroupAccess.allowed && senderGroupAccess.reason === "disabled") {
+      return {
+        ok: false,
+        denyReason: "channels-disabled",
+        commandAuthorized: false,
+        channelInfo,
+        kind,
+        chatType,
+        channelName,
+        channelDisplay,
+        roomLabel,
+      };
+    }
+
+    if (!senderGroupAccess.allowed && senderGroupAccess.reason === "empty_allowlist") {
+      return {
+        ok: false,
+        denyReason: "channel-no-allowlist",
+        commandAuthorized: false,
+        channelInfo,
+        kind,
+        chatType,
+        channelName,
+        channelDisplay,
+        roomLabel,
+      };
+    }
+
+    if (!senderGroupAccess.allowed && senderGroupAccess.reason === "sender_not_allowlisted") {
+      return {
+        ok: false,
+        denyReason: "unauthorized",
+        commandAuthorized: false,
+        channelInfo,
+        kind,
+        chatType,
+        channelName,
+        channelDisplay,
+        roomLabel,
+      };
+    }
+
+    if (commandGate.shouldBlock) {
+      return {
+        ok: false,
+        denyReason: "unauthorized",
+        commandAuthorized: false,
+        channelInfo,
+        kind,
+        chatType,
+        channelName,
+        channelDisplay,
+        roomLabel,
+      };
+    }
+  }
+
+  return {
+    ok: true,
+    commandAuthorized,
+    channelInfo,
+    kind,
+    chatType,
+    channelName,
+    channelDisplay,
+    roomLabel,
+  };
+}

extensions/mattermost/src/mattermost/monitor-gating.test.ts

@@ -0,0 +1,84 @@
+import { describe, expect, it, vi } from "vitest";
+import {
+  evaluateMattermostMentionGate,
+  mapMattermostChannelTypeToChatType,
+} from "./monitor-gating.js";
+
+describe("mattermost monitor gating", () => {
+  it("maps mattermost channel types to chat types", () => {
+    expect(mapMattermostChannelTypeToChatType("D")).toBe("direct");
+    expect(mapMattermostChannelTypeToChatType("G")).toBe("group");
+    expect(mapMattermostChannelTypeToChatType("P")).toBe("group");
+    expect(mapMattermostChannelTypeToChatType("O")).toBe("channel");
+    expect(mapMattermostChannelTypeToChatType(undefined)).toBe("channel");
+  });
+
+  it("drops non-mentioned traffic when onchar is enabled but not triggered", () => {
+    const resolveRequireMention = vi.fn(() => true);
+
+    expect(
+      evaluateMattermostMentionGate({
+        kind: "channel",
+        cfg: {} as never,
+        accountId: "default",
+        channelId: "chan-1",
+        resolveRequireMention,
+        wasMentioned: false,
+        isControlCommand: false,
+        commandAuthorized: false,
+        oncharEnabled: true,
+        oncharTriggered: false,
+        canDetectMention: true,
+      }),
+    ).toEqual({
+      shouldRequireMention: true,
+      shouldBypassMention: false,
+      effectiveWasMentioned: false,
+      dropReason: "onchar-not-triggered",
+    });
+  });
+
+  it("bypasses mention for authorized control commands and allows direct chats", () => {
+    const resolveRequireMention = vi.fn(() => true);
+
+    expect(
+      evaluateMattermostMentionGate({
+        kind: "channel",
+        cfg: {} as never,
+        accountId: "default",
+        channelId: "chan-1",
+        resolveRequireMention,
+        wasMentioned: false,
+        isControlCommand: true,
+        commandAuthorized: true,
+        oncharEnabled: false,
+        oncharTriggered: false,
+        canDetectMention: true,
+      }),
+    ).toEqual({
+      shouldRequireMention: true,
+      shouldBypassMention: true,
+      effectiveWasMentioned: true,
+      dropReason: null,
+    });
+
+    expect(
+      evaluateMattermostMentionGate({
+        kind: "direct",
+        cfg: {} as never,
+        accountId: "default",
+        channelId: "chan-1",
+        resolveRequireMention,
+        wasMentioned: false,
+        isControlCommand: false,
+        commandAuthorized: false,
+        oncharEnabled: false,
+        oncharTriggered: false,
+        canDetectMention: true,
+      }),
+    ).toMatchObject({
+      shouldRequireMention: false,
+      dropReason: null,
+    });
+  });
+});

extensions/mattermost/src/mattermost/monitor-gating.ts

@@ -0,0 +1,99 @@
+import type { ChatType, OpenClawConfig } from "./runtime-api.js";
+
+export function mapMattermostChannelTypeToChatType(channelType?: string | null): ChatType {
+  if (!channelType) {
+    return "channel";
+  }
+  const normalized = channelType.trim().toUpperCase();
+  if (normalized === "D") {
+    return "direct";
+  }
+  if (normalized === "G" || normalized === "P") {
+    return "group";
+  }
+  return "channel";
+}
+
+export type MattermostRequireMentionResolverInput = {
+  cfg: OpenClawConfig;
+  channel: "mattermost";
+  accountId: string;
+  groupId: string;
+  requireMentionOverride?: boolean;
+};
+
+export type MattermostMentionGateInput = {
+  kind: ChatType;
+  cfg: OpenClawConfig;
+  accountId: string;
+  channelId: string;
+  threadRootId?: string;
+  requireMentionOverride?: boolean;
+  resolveRequireMention: (params: MattermostRequireMentionResolverInput) => boolean;
+  wasMentioned: boolean;
+  isControlCommand: boolean;
+  commandAuthorized: boolean;
+  oncharEnabled: boolean;
+  oncharTriggered: boolean;
+  canDetectMention: boolean;
+};
+
+type MattermostMentionGateDecision = {
+  shouldRequireMention: boolean;
+  shouldBypassMention: boolean;
+  effectiveWasMentioned: boolean;
+  dropReason: "onchar-not-triggered" | "missing-mention" | null;
+};
+
+export function evaluateMattermostMentionGate(
+  params: MattermostMentionGateInput,
+): MattermostMentionGateDecision {
+  const shouldRequireMention =
+    params.kind !== "direct" &&
+    params.resolveRequireMention({
+      cfg: params.cfg,
+      channel: "mattermost",
+      accountId: params.accountId,
+      groupId: params.channelId,
+      requireMentionOverride: params.requireMentionOverride,
+    });
+  const shouldBypassMention =
+    params.isControlCommand &&
+    shouldRequireMention &&
+    !params.wasMentioned &&
+    params.commandAuthorized;
+  const effectiveWasMentioned =
+    params.wasMentioned || shouldBypassMention || params.oncharTriggered;
+  if (
+    params.oncharEnabled &&
+    !params.oncharTriggered &&
+    !params.wasMentioned &&
+    !params.isControlCommand
+  ) {
+    return {
+      shouldRequireMention,
+      shouldBypassMention,
+      effectiveWasMentioned,
+      dropReason: "onchar-not-triggered",
+    };
+  }
+  if (
+    params.kind !== "direct" &&
+    shouldRequireMention &&
+    params.canDetectMention &&
+    !effectiveWasMentioned
+  ) {
+    return {
+      shouldRequireMention,
+      shouldBypassMention,
+      effectiveWasMentioned,
+      dropReason: "missing-mention",
+    };
+  }
+  return {
+    shouldRequireMention,
+    shouldBypassMention,
+    effectiveWasMentioned,
+    dropReason: null,
+  };
+}

extensions/mattermost/src/mattermost/monitor-helpers.test.ts

@@ -0,0 +1,82 @@
+import { describe, expect, it } from "vitest";
+import { normalizeMention } from "./monitor-helpers.js";
+
+describe("normalizeMention", () => {
+  it("returns trimmed text when no mention provided", () => {
+    expect(normalizeMention("  hello world  ", undefined)).toBe("hello world");
+  });
+
+  it("strips bot mention from text", () => {
+    expect(normalizeMention("@echobot hello", "echobot")).toBe("hello");
+  });
+
+  it("strips mention case-insensitively", () => {
+    expect(normalizeMention("@EchoBot hello", "echobot")).toBe("hello");
+  });
+
+  it("preserves newlines in multi-line messages", () => {
+    const input = "@echobot\nline1\nline2\nline3";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toBe("line1\nline2\nline3");
+  });
+
+  it("preserves Markdown headings", () => {
+    const input = "@echobot\n# Heading\n\nSome text";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toContain("# Heading");
+    expect(result).toContain("\n");
+  });
+
+  it("preserves Markdown blockquotes", () => {
+    const input = "@echobot\n> quoted line\n> second line";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toContain("> quoted line");
+    expect(result).toContain("> second line");
+  });
+
+  it("preserves Markdown lists", () => {
+    const input = "@echobot\n- item A\n- item B\n  - sub B1";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toContain("- item A");
+    expect(result).toContain("- item B");
+  });
+
+  it("preserves task lists", () => {
+    const input = "@echobot\n- [ ] todo\n- [x] done";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toContain("- [ ] todo");
+    expect(result).toContain("- [x] done");
+  });
+
+  it("handles mention in middle of text", () => {
+    const input = "hey @echobot check this\nout";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toBe("hey check this\nout");
+  });
+
+  it("preserves leading indentation for nested lists", () => {
+    const input = "@echobot\n- item\n  - nested\n    - deep";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toContain("  - nested");
+    expect(result).toContain("    - deep");
+  });
+
+  it("preserves first-line indentation for nested list items", () => {
+    const input = "@echobot\n  - nested\n    - deep";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toBe("  - nested\n    - deep");
+  });
+
+  it("preserves indented code blocks", () => {
+    const input = "@echobot\ntext\n    code line 1\n    code line 2";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toContain("    code line 1");
+    expect(result).toContain("    code line 2");
+  });
+
+  it("preserves first-line indentation for indented code blocks", () => {
+    const input = "@echobot\n    code line 1\n    code line 2";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toBe("    code line 1\n    code line 2");
+  });
+});

extensions/mattermost/src/mattermost/monitor-helpers.ts

@@ -0,0 +1,110 @@
+import {
+  createDedupeCache,
+  formatInboundFromLabel as formatInboundFromLabelShared,
+  rawDataToString,
+  resolveThreadSessionKeys as resolveThreadSessionKeysShared,
+  type OpenClawConfig,
+} from "./runtime-api.js";
+
+export { createDedupeCache, rawDataToString };
+
+export type ResponsePrefixContext = {
+  model?: string;
+  modelFull?: string;
+  provider?: string;
+  thinkingLevel?: string;
+  identityName?: string;
+};
+
+export function extractShortModelName(fullModel: string): string {
+  const slash = fullModel.lastIndexOf("/");
+  const modelPart = slash >= 0 ? fullModel.slice(slash + 1) : fullModel;
+  return modelPart.replace(/-\d{8}$/, "").replace(/-latest$/, "");
+}
+
+export const formatInboundFromLabel = formatInboundFromLabelShared;
+
+function normalizeAgentId(value: string | undefined | null): string {
+  const trimmed = (value ?? "").trim();
+  if (!trimmed) {
+    return "main";
+  }
+  if (/^[a-z0-9][a-z0-9_-]{0,63}$/i.test(trimmed)) {
+    return trimmed;
+  }
+  return (
+    trimmed
+      .toLowerCase()
+      .replace(/[^a-z0-9_-]+/g, "-")
+      .replace(/^-+/, "")
+      .replace(/-+$/, "")
+      .slice(0, 64) || "main"
+  );
+}
+
+type AgentEntry = NonNullable<NonNullable<OpenClawConfig["agents"]>["list"]>[number];
+
+function isAgentEntry(entry: unknown): entry is AgentEntry {
+  return Boolean(entry && typeof entry === "object");
+}
+
+function listAgents(cfg: OpenClawConfig): AgentEntry[] {
+  return Array.isArray(cfg.agents?.list) ? cfg.agents.list.filter(isAgentEntry) : [];
+}
+
+function resolveAgentEntry(cfg: OpenClawConfig, agentId: string): AgentEntry | undefined {
+  const id = normalizeAgentId(agentId);
+  return listAgents(cfg).find((entry) => normalizeAgentId(entry.id) === id);
+}
+
+export function resolveIdentityName(cfg: OpenClawConfig, agentId: string): string | undefined {
+  const entry = resolveAgentEntry(cfg, agentId);
+  return entry?.identity?.name?.trim() || undefined;
+}
+
+export function resolveThreadSessionKeys(params: {
+  baseSessionKey: string;
+  threadId?: string | null;
+  parentSessionKey?: string;
+  useSuffix?: boolean;
+}): { sessionKey: string; parentSessionKey?: string } {
+  return resolveThreadSessionKeysShared({
+    ...params,
+    normalizeThreadId: (threadId) => threadId,
+  });
+}
+
+/**
+ * Strip bot mention from message text while preserving newlines and
+ * block-level Markdown formatting (headings, lists, blockquotes).
+ */
+export function normalizeMention(text: string, mention: string | undefined): string {
+  if (!mention) {
+    return text.trim();
+  }
+  const escaped = mention.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
+  const hasMentionRe = new RegExp(`@${escaped}\\b`, "i");
+  const leadingMentionRe = new RegExp(`^([\\t ]*)@${escaped}\\b[\\t ]*`, "i");
+  const trailingMentionRe = new RegExp(`[\\t ]*@${escaped}\\b[\\t ]*$`, "i");
+  const normalizedLines = text.split("\n").map((line) => {
+    const hadMention = hasMentionRe.test(line);
+    const normalizedLine = line
+      .replace(leadingMentionRe, "$1")
+      .replace(trailingMentionRe, "")
+      .replace(new RegExp(`@${escaped}\\b`, "gi"), "")
+      .replace(/(\S)[ \t]{2,}/g, "$1 ");
+    return {
+      text: normalizedLine,
+      mentionOnlyBlank: hadMention && normalizedLine.trim() === "",
+    };
+  });
+
+  while (normalizedLines[0]?.mentionOnlyBlank) {
+    normalizedLines.shift();
+  }
+  while (normalizedLines.at(-1)?.text.trim() === "") {
+    normalizedLines.pop();
+  }
+
+  return normalizedLines.map((line) => line.text).join("\n");
+}

extensions/mattermost/src/mattermost/monitor-onchar.test.ts

@@ -0,0 +1,32 @@
+import { describe, expect, it } from "vitest";
+import { resolveOncharPrefixes, stripOncharPrefix } from "./monitor-onchar.js";
+
+describe("mattermost monitor onchar", () => {
+  it("uses defaults when prefixes are missing or empty after trimming", () => {
+    expect(resolveOncharPrefixes(undefined)).toEqual([">", "!"]);
+    expect(resolveOncharPrefixes([" ", ""])).toEqual([">", "!"]);
+  });
+
+  it("trims configured prefixes and preserves order", () => {
+    expect(resolveOncharPrefixes(["  ?? ", " !", " /bot "])).toEqual(["??", "!", "/bot"]);
+  });
+
+  it("strips the first matching prefix after leading whitespace", () => {
+    expect(stripOncharPrefix("   ! hello world", ["!", ">"])).toEqual({
+      triggered: true,
+      stripped: "hello world",
+    });
+
+    expect(stripOncharPrefix("??multi prefix", ["??", "?"])).toEqual({
+      triggered: true,
+      stripped: "multi prefix",
+    });
+  });
+
+  it("returns the original text when no prefix matches", () => {
+    expect(stripOncharPrefix("hello world", ["!", ">"])).toEqual({
+      triggered: false,
+      stripped: "hello world",
+    });
+  });
+});

extensions/mattermost/src/mattermost/monitor-onchar.ts

@@ -0,0 +1,25 @@
+const DEFAULT_ONCHAR_PREFIXES = [">", "!"];
+
+export function resolveOncharPrefixes(prefixes: string[] | undefined): string[] {
+  const cleaned = prefixes?.map((entry) => entry.trim()).filter(Boolean) ?? DEFAULT_ONCHAR_PREFIXES;
+  return cleaned.length > 0 ? cleaned : DEFAULT_ONCHAR_PREFIXES;
+}
+
+export function stripOncharPrefix(
+  text: string,
+  prefixes: string[],
+): { triggered: boolean; stripped: string } {
+  const trimmed = text.trimStart();
+  for (const prefix of prefixes) {
+    if (!prefix) {
+      continue;
+    }
+    if (trimmed.startsWith(prefix)) {
+      return {
+        triggered: true,
+        stripped: trimmed.slice(prefix.length).trimStart(),
+      };
+    }
+  }
+  return { triggered: false, stripped: text };
+}

extensions/mattermost/src/mattermost/monitor-resources.test.ts

@@ -0,0 +1,155 @@
+import { beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+
+const fetchMattermostChannel = vi.hoisted(() => vi.fn());
+const fetchMattermostUser = vi.hoisted(() => vi.fn());
+const sendMattermostTyping = vi.hoisted(() => vi.fn());
+const updateMattermostPost = vi.hoisted(() => vi.fn());
+const buildButtonProps = vi.hoisted(() => vi.fn());
+
+vi.mock("./client.js", () => ({
+  fetchMattermostChannel,
+  fetchMattermostUser,
+  sendMattermostTyping,
+  updateMattermostPost,
+}));
+
+vi.mock("./interactions.js", () => ({
+  buildButtonProps,
+}));
+
+describe("mattermost monitor resources", () => {
+  let createMattermostMonitorResources: typeof import("./monitor-resources.js").createMattermostMonitorResources;
+
+  beforeAll(async () => {
+    ({ createMattermostMonitorResources } = await import("./monitor-resources.js"));
+  });
+
+  beforeEach(() => {
+    fetchMattermostChannel.mockReset();
+    fetchMattermostUser.mockReset();
+    sendMattermostTyping.mockReset();
+    updateMattermostPost.mockReset();
+    buildButtonProps.mockReset();
+  });
+
+  it("downloads media, preserves auth headers, and infers media kind", async () => {
+    const fetchRemoteMedia = vi.fn(async () => ({
+      buffer: new Uint8Array([1, 2, 3]),
+      contentType: "image/png",
+    }));
+    const saveMediaBuffer = vi.fn(async () => ({
+      path: "/tmp/file.png",
+      contentType: "image/png",
+    }));
+
+    const resources = createMattermostMonitorResources({
+      accountId: "default",
+      callbackUrl: "https://openclaw.test/callback",
+      client: {
+        apiBaseUrl: "https://chat.example.com/api/v4",
+        baseUrl: "https://chat.example.com",
+        // pragma: allowlist secret
+        token: "bot-token",
+      } as never,
+      logger: {},
+      mediaMaxBytes: 1024,
+      fetchRemoteMedia,
+      saveMediaBuffer,
+      mediaKindFromMime: () => "image",
+    });
+
+    await expect(resources.resolveMattermostMedia([" file-1 "])).resolves.toEqual([
+      {
+        path: "/tmp/file.png",
+        contentType: "image/png",
+        kind: "image",
+      },
+    ]);
+
+    expect(fetchRemoteMedia).toHaveBeenCalledWith({
+      url: "https://chat.example.com/api/v4/files/file-1",
+      requestInit: {
+        headers: {
+          // pragma: allowlist secret
+        Authorization: "Bearer bot-token",
+        },
+      },
+      filePathHint: "file-1",
+      maxBytes: 1024,
+      ssrfPolicy: { allowedHostnames: ["chat.example.com"] },
+    });
+  });
+
+  it("caches channel and user lookups and falls back to empty picker props", async () => {
+    fetchMattermostChannel.mockResolvedValue({ id: "chan-1", name: "town-square" });
+    fetchMattermostUser.mockResolvedValue({ id: "user-1", username: "alice" });
+    buildButtonProps.mockReturnValue(undefined);
+
+    const resources = createMattermostMonitorResources({
+      accountId: "default",
+      callbackUrl: "https://openclaw.test/callback",
+      client: {} as never,
+      logger: {},
+      mediaMaxBytes: 1024,
+      fetchRemoteMedia: vi.fn(),
+      saveMediaBuffer: vi.fn(),
+      mediaKindFromMime: () => "document",
+    });
+
+    await expect(resources.resolveChannelInfo("chan-1")).resolves.toEqual({
+      id: "chan-1",
+      name: "town-square",
+    });
+    await expect(resources.resolveChannelInfo("chan-1")).resolves.toEqual({
+      id: "chan-1",
+      name: "town-square",
+    });
+    await expect(resources.resolveUserInfo("user-1")).resolves.toEqual({
+      id: "user-1",
+      username: "alice",
+    });
+    await expect(resources.resolveUserInfo("user-1")).resolves.toEqual({
+      id: "user-1",
+      username: "alice",
+    });
+
+    expect(fetchMattermostChannel).toHaveBeenCalledTimes(1);
+    expect(fetchMattermostUser).toHaveBeenCalledTimes(1);
+
+    await resources.updateModelPickerPost({
+      channelId: "chan-1",
+      postId: "post-1",
+      message: "Pick a model",
+    });
+
+    expect(updateMattermostPost).toHaveBeenCalledWith(
+      {},
+      "post-1",
+      expect.objectContaining({
+        message: "Pick a model",
+        props: { attachments: [] },
+      }),
+    );
+  });
+
+  it("proxies typing indicators to the mattermost client helper", async () => {
+    const client = {} as never;
+
+    const resources = createMattermostMonitorResources({
+      accountId: "default",
+      callbackUrl: "https://openclaw.test/callback",
+      client,
+      logger: {},
+      mediaMaxBytes: 1024,
+      fetchRemoteMedia: vi.fn(),
+      saveMediaBuffer: vi.fn(),
+      mediaKindFromMime: () => "document",
+    });
+
+    await resources.sendTypingIndicator("chan-1", "root-1");
+    expect(sendMattermostTyping).toHaveBeenCalledWith(client, {
+      channelId: "chan-1",
+      parentId: "root-1",
+    });
+  });
+});

extensions/mattermost/src/mattermost/monitor-resources.ts

@@ -0,0 +1,183 @@
+import {
+  fetchMattermostChannel,
+  fetchMattermostUser,
+  sendMattermostTyping,
+  updateMattermostPost,
+  type MattermostChannel,
+  type MattermostClient,
+  type MattermostUser,
+} from "./client.js";
+import { buildButtonProps, type MattermostInteractionResponse } from "./interactions.js";
+
+export type MattermostMediaKind = "image" | "audio" | "video" | "document" | "unknown";
+
+export type MattermostMediaInfo = {
+  path: string;
+  contentType?: string;
+  kind: MattermostMediaKind;
+};
+
+const CHANNEL_CACHE_TTL_MS = 5 * 60_000;
+const USER_CACHE_TTL_MS = 10 * 60_000;
+
+type FetchRemoteMedia = (params: {
+  url: string;
+  requestInit?: RequestInit;
+  filePathHint?: string;
+  maxBytes: number;
+  ssrfPolicy?: { allowedHostnames?: string[] };
+}) => Promise<{ buffer: Uint8Array; contentType?: string | null }>;
+
+type SaveMediaBuffer = (
+  buffer: Uint8Array,
+  contentType: string | undefined,
+  direction: "inbound" | "outbound",
+  maxBytes: number,
+) => Promise<{ path: string; contentType?: string | null }>;
+
+export function createMattermostMonitorResources(params: {
+  accountId: string;
+  callbackUrl: string;
+  client: MattermostClient;
+  logger: { debug?: (...args: unknown[]) => void };
+  mediaMaxBytes: number;
+  fetchRemoteMedia: FetchRemoteMedia;
+  saveMediaBuffer: SaveMediaBuffer;
+  mediaKindFromMime: (contentType?: string) => MattermostMediaKind | null | undefined;
+}) {
+  const {
+    accountId,
+    callbackUrl,
+    client,
+    logger,
+    mediaMaxBytes,
+    fetchRemoteMedia,
+    saveMediaBuffer,
+    mediaKindFromMime,
+  } = params;
+  const channelCache = new Map<string, { value: MattermostChannel | null; expiresAt: number }>();
+  const userCache = new Map<string, { value: MattermostUser | null; expiresAt: number }>();
+
+  const resolveMattermostMedia = async (
+    fileIds?: string[] | null,
+  ): Promise<MattermostMediaInfo[]> => {
+    const ids = (fileIds ?? []).map((id) => id?.trim()).filter(Boolean);
+    if (ids.length === 0) {
+      return [];
+    }
+    const out: MattermostMediaInfo[] = [];
+    for (const fileId of ids) {
+      try {
+        const fetched = await fetchRemoteMedia({
+          url: `${client.apiBaseUrl}/files/${fileId}`,
+          requestInit: {
+            headers: {
+              Authorization: `Bearer ${client.token}`,
+            },
+          },
+          filePathHint: fileId,
+          maxBytes: mediaMaxBytes,
+          ssrfPolicy: { allowedHostnames: [new URL(client.baseUrl).hostname] },
+        });
+        const saved = await saveMediaBuffer(
+          Buffer.from(fetched.buffer),
+          fetched.contentType ?? undefined,
+          "inbound",
+          mediaMaxBytes,
+        );
+        const contentType = saved.contentType ?? fetched.contentType ?? undefined;
+        out.push({
+          path: saved.path,
+          contentType,
+          kind: mediaKindFromMime(contentType) ?? "unknown",
+        });
+      } catch (err) {
+        logger.debug?.(`mattermost: failed to download file ${fileId}: ${String(err)}`);
+      }
+    }
+    return out;
+  };
+
+  const sendTypingIndicator = async (channelId: string, parentId?: string) => {
+    await sendMattermostTyping(client, { channelId, parentId });
+  };
+
+  const resolveChannelInfo = async (channelId: string): Promise<MattermostChannel | null> => {
+    const cached = channelCache.get(channelId);
+    if (cached && cached.expiresAt > Date.now()) {
+      return cached.value;
+    }
+    try {
+      const info = await fetchMattermostChannel(client, channelId);
+      channelCache.set(channelId, {
+        value: info,
+        expiresAt: Date.now() + CHANNEL_CACHE_TTL_MS,
+      });
+      return info;
+    } catch (err) {
+      logger.debug?.(`mattermost: channel lookup failed: ${String(err)}`);
+      channelCache.set(channelId, {
+        value: null,
+        expiresAt: Date.now() + CHANNEL_CACHE_TTL_MS,
+      });
+      return null;
+    }
+  };
+
+  const resolveUserInfo = async (userId: string): Promise<MattermostUser | null> => {
+    const cached = userCache.get(userId);
+    if (cached && cached.expiresAt > Date.now()) {
+      return cached.value;
+    }
+    try {
+      const info = await fetchMattermostUser(client, userId);
+      userCache.set(userId, {
+        value: info,
+        expiresAt: Date.now() + USER_CACHE_TTL_MS,
+      });
+      return info;
+    } catch (err) {
+      logger.debug?.(`mattermost: user lookup failed: ${String(err)}`);
+      userCache.set(userId, {
+        value: null,
+        expiresAt: Date.now() + USER_CACHE_TTL_MS,
+      });
+      return null;
+    }
+  };
+
+  const buildModelPickerProps = (
+    channelId: string,
+    buttons: Array<unknown>,
+  ): Record<string, unknown> | undefined =>
+    buildButtonProps({
+      callbackUrl,
+      accountId,
+      channelId,
+      buttons,
+    });
+
+  const updateModelPickerPost = async (params: {
+    channelId: string;
+    postId: string;
+    message: string;
+    buttons?: Array<unknown>;
+  }): Promise<MattermostInteractionResponse> => {
+    const props = buildModelPickerProps(params.channelId, params.buttons ?? []) ?? {
+      attachments: [],
+    };
+    await updateMattermostPost(client, params.postId, {
+      message: params.message,
+      props,
+    });
+    return {};
+  };
+
+  return {
+    resolveMattermostMedia,
+    sendTypingIndicator,
+    resolveChannelInfo,
+    resolveUserInfo,
+    updateModelPickerPost,
+  };
+}

extensions/mattermost/src/mattermost/monitor-slash.test.ts

@@ -0,0 +1,183 @@
+import { afterEach, beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+
+const listSkillCommandsForAgents = vi.hoisted(() => vi.fn());
+const parseStrictPositiveInteger = vi.hoisted(() => vi.fn());
+const fetchMattermostUserTeams = vi.hoisted(() => vi.fn());
+const normalizeMattermostBaseUrl = vi.hoisted(() => vi.fn((value: string | undefined) => value));
+const isSlashCommandsEnabled = vi.hoisted(() => vi.fn());
+const registerSlashCommands = vi.hoisted(() => vi.fn());
+const resolveCallbackUrl = vi.hoisted(() => vi.fn());
+const resolveSlashCommandConfig = vi.hoisted(() => vi.fn());
+const activateSlashCommands = vi.hoisted(() => vi.fn());
+
+vi.mock("./runtime-api.js", () => ({
+  listSkillCommandsForAgents,
+  parseStrictPositiveInteger,
+}));
+
+vi.mock("./client.js", async () => {
+  const actual = await vi.importActual<typeof import("./client.js")>("./client.js");
+  return {
+    ...actual,
+    fetchMattermostUserTeams,
+    normalizeMattermostBaseUrl,
+  };
+});
+
+vi.mock("./slash-commands.js", () => ({
+  DEFAULT_COMMAND_SPECS: [
+    { trigger: "ping", description: "ping" },
+    { trigger: "ping", description: "duplicate" },
+  ],
+  isSlashCommandsEnabled,
+  registerSlashCommands,
+  resolveCallbackUrl,
+  resolveSlashCommandConfig,
+}));
+
+vi.mock("./slash-state.js", () => ({
+  activateSlashCommands,
+}));
+
+describe("mattermost monitor slash", () => {
+  let registerMattermostMonitorSlashCommands: typeof import("./monitor-slash.js").registerMattermostMonitorSlashCommands;
+
+  beforeAll(async () => {
+    ({ registerMattermostMonitorSlashCommands } = await import("./monitor-slash.js"));
+  });
+
+  beforeEach(() => {
+    listSkillCommandsForAgents.mockReset();
+    parseStrictPositiveInteger.mockReset();
+    fetchMattermostUserTeams.mockReset();
+    normalizeMattermostBaseUrl.mockClear();
+    isSlashCommandsEnabled.mockReset();
+    registerSlashCommands.mockReset();
+    resolveCallbackUrl.mockReset();
+    resolveSlashCommandConfig.mockReset();
+    activateSlashCommands.mockReset();
+  });
+
+  afterEach(() => {
+    vi.unstubAllEnvs();
+  });
+
+  it("returns early when slash commands are disabled", async () => {
+    resolveSlashCommandConfig.mockReturnValue({ enabled: false });
+    isSlashCommandsEnabled.mockReturnValue(false);
+
+    await registerMattermostMonitorSlashCommands({
+      client: {} as never,
+      cfg: {} as never,
+      runtime: {} as never,
+      account: { config: {} } as never,
+      baseUrl: "https://chat.example.com",
+      botUserId: "bot-user",
+    });
+
+    expect(fetchMattermostUserTeams).not.toHaveBeenCalled();
+    expect(activateSlashCommands).not.toHaveBeenCalled();
+  });
+
+  it("registers deduped default and native skill commands across teams", async () => {
+    vi.stubEnv("OPENCLAW_GATEWAY_PORT", "18888");
+    resolveSlashCommandConfig.mockReturnValue({ enabled: true, nativeSkills: true });
+    isSlashCommandsEnabled.mockReturnValue(true);
+    parseStrictPositiveInteger.mockReturnValue(18888);
+    fetchMattermostUserTeams.mockResolvedValue([{ id: "team-1" }, { id: "team-2" }]);
+    resolveCallbackUrl.mockReturnValue("https://openclaw.test/slash");
+    listSkillCommandsForAgents.mockReturnValue([
+      { name: "skill", description: "Skill run" },
+      { name: "oc_ping", description: "Already prefixed" },
+      { name: "   ", description: "ignored" },
+    ]);
+    registerSlashCommands
+      .mockResolvedValueOnce([{ token: "token-1", trigger: "ping" }])
+      .mockResolvedValueOnce([{ token: "token-2", trigger: "oc_skill" }]);
+    const runtime = {
+      log: vi.fn(),
+      error: vi.fn(),
+    };
+
+    await registerMattermostMonitorSlashCommands({
+      client: {} as never,
+      cfg: { gateway: { port: 18789 } } as never,
+      runtime: runtime as never,
+      account: { config: { commands: {} }, accountId: "default" } as never,
+      baseUrl: "https://chat.example.com",
+      botUserId: "bot-user",
+    });
+
+    expect(registerSlashCommands).toHaveBeenCalledTimes(2);
+    expect(registerSlashCommands.mock.calls[0]?.[0]).toMatchObject({
+      teamId: "team-1",
+      creatorUserId: "bot-user",
+      callbackUrl: "https://openclaw.test/slash",
+    });
+    expect(registerSlashCommands.mock.calls[0]?.[0].commands).toEqual([
+      { trigger: "ping", description: "ping" },
+      {
+        trigger: "oc_skill",
+        description: "Skill run",
+        autoComplete: true,
+        autoCompleteHint: "[args]",
+        originalName: "skill",
+      },
+      {
+        trigger: "oc_ping",
+        description: "Already prefixed",
+        autoComplete: true,
+        autoCompleteHint: "[args]",
+        originalName: "oc_ping",
+      },
+    ]);
+    expect(activateSlashCommands).toHaveBeenCalledWith(
+      expect.objectContaining({
+        commandTokens: ["token-1", "token-2"],
+        triggerMap: new Map([
+          ["oc_skill", "skill"],
+          ["oc_ping", "oc_ping"],
+        ]),
+      }),
+    );
+    expect(runtime.log).toHaveBeenCalledWith(
+      "mattermost: slash commands registered (2 commands across 2 teams, callback=https://openclaw.test/slash)",
+    );
+  });
+
+  it("warns on loopback callback urls and reports partial team failures", async () => {
+    resolveSlashCommandConfig.mockReturnValue({ enabled: true, nativeSkills: false });
+    isSlashCommandsEnabled.mockReturnValue(true);
+    parseStrictPositiveInteger.mockReturnValue(undefined);
+    fetchMattermostUserTeams.mockResolvedValue([{ id: "team-1" }, { id: "team-2" }]);
+    resolveCallbackUrl.mockReturnValue("http://127.0.0.1:18789/slash");
+    registerSlashCommands
+      .mockResolvedValueOnce([{ token: "token-1", trigger: "ping" }])
+      .mockRejectedValueOnce(new Error("boom"));
+    const runtime = {
+      log: vi.fn(),
+      error: vi.fn(),
+    };
+
+    await registerMattermostMonitorSlashCommands({
+      client: {} as never,
+      cfg: { gateway: { customBindHost: "loopback" } } as never,
+      runtime: runtime as never,
+      account: { config: { commands: {} }, accountId: "default" } as never,
+      baseUrl: "https://chat.example.com",
+      botUserId: "bot-user",
+    });
+
+    expect(runtime.error).toHaveBeenCalledWith(
+      expect.stringContaining(
+        "slash commands callbackUrl resolved to http://127.0.0.1:18789/slash",
+      ),
+    );
+    expect(runtime.error).toHaveBeenCalledWith(
+      "mattermost: failed to register slash commands for team team-2: Error: boom",
+    );
+    expect(runtime.error).toHaveBeenCalledWith(
+      "mattermost: slash command registration completed with 1 team error(s)",
+    );
+  });
+});

extensions/mattermost/src/mattermost/monitor-slash.ts

@@ -0,0 +1,211 @@
+import type { ResolvedMattermostAccount } from "./accounts.js";
+import {
+  fetchMattermostUserTeams,
+  normalizeMattermostBaseUrl,
+  type MattermostClient,
+} from "./client.js";
+import {
+  listSkillCommandsForAgents,
+  parseStrictPositiveInteger,
+  type OpenClawConfig,
+  type RuntimeEnv,
+} from "./runtime-api.js";
+import {
+  DEFAULT_COMMAND_SPECS,
+  isSlashCommandsEnabled,
+  registerSlashCommands,
+  resolveCallbackUrl,
+  resolveSlashCommandConfig,
+  type MattermostCommandSpec,
+  type MattermostRegisteredCommand,
+  type MattermostSlashCommandConfig,
+} from "./slash-commands.js";
+import { activateSlashCommands } from "./slash-state.js";
+
+function isLoopbackHost(hostname: string): boolean {
+  return hostname === "localhost" || hostname === "127.0.0.1" || hostname === "::1";
+}
+
+function buildSlashCommands(params: {
+  cfg: OpenClawConfig;
+  runtime: RuntimeEnv;
+  nativeSkills: boolean;
+}): MattermostCommandSpec[] {
+  const commandsToRegister: MattermostCommandSpec[] = [...DEFAULT_COMMAND_SPECS];
+  if (!params.nativeSkills) {
+    return commandsToRegister;
+  }
+  try {
+    const skillCommands = listSkillCommandsForAgents({ cfg: params.cfg });
+    for (const spec of skillCommands) {
+      const name = typeof spec.name === "string" ? spec.name.trim() : "";
+      if (!name) continue;
+      const trigger = name.startsWith("oc_") ? name : `oc_${name}`;
+      commandsToRegister.push({
+        trigger,
+        description: spec.description || `Run skill ${name}`,
+        autoComplete: true,
+        autoCompleteHint: "[args]",
+        originalName: name,
+      });
+    }
+  } catch (err) {
+    params.runtime.error?.(`mattermost: failed to list skill commands: ${String(err)}`);
+  }
+  return commandsToRegister;
+}
+
+function dedupeSlashCommands(commands: MattermostCommandSpec[]): MattermostCommandSpec[] {
+  const seen = new Set<string>();
+  return commands.filter((cmd) => {
+    const key = cmd.trigger.trim();
+    if (!key || seen.has(key)) {
+      return false;
+    }
+    seen.add(key);
+    return true;
+  });
+}
+
+function buildTriggerMap(commands: MattermostCommandSpec[]): Map<string, string> {
+  const triggerMap = new Map<string, string>();
+  for (const cmd of commands) {
+    if (cmd.originalName) {
+      triggerMap.set(cmd.trigger, cmd.originalName);
+    }
+  }
+  return triggerMap;
+}
+
+function warnOnSuspiciousCallbackUrl(params: {
+  runtime: RuntimeEnv;
+  baseUrl: string;
+  callbackUrl: string;
+}) {
+  try {
+    const mmHost = new URL(normalizeMattermostBaseUrl(params.baseUrl) ?? params.baseUrl).hostname;
+    const callbackHost = new URL(params.callbackUrl).hostname;
+
+    if (isLoopbackHost(callbackHost) && !isLoopbackHost(mmHost)) {
+      params.runtime.error?.(
+        `mattermost: slash commands callbackUrl resolved to ${params.callbackUrl} (loopback) while baseUrl is ${params.baseUrl}. This MAY be unreachable depending on your deployment. If native slash commands don't work, set channels.mattermost.commands.callbackUrl to a URL reachable from the Mattermost server (e.g. your public reverse proxy URL).`,
+      );
+    }
+  } catch {
+    // Ignore malformed URLs and let the downstream registration fail naturally.
+  }
+}
+
+async function registerSlashCommandsAcrossTeams(params: {
+  client: MattermostClient;
+  teams: Array<{ id: string }>;
+  botUserId: string;
+  callbackUrl: string;
+  commands: MattermostCommandSpec[];
+  runtime: RuntimeEnv;
+}): Promise<{
+  registered: MattermostRegisteredCommand[];
+  teamRegistrationFailures: number;
+}> {
+  const registered: MattermostRegisteredCommand[] = [];
+  let teamRegistrationFailures = 0;
+
+  for (const team of params.teams) {
+    try {
+      const created = await registerSlashCommands({
+        client: params.client,
+        teamId: team.id,
+        creatorUserId: params.botUserId,
+        callbackUrl: params.callbackUrl,
+        commands: params.commands,
+        log: (msg) => params.runtime.log?.(msg),
+      });
+      registered.push(...created);
+    } catch (err) {
+      teamRegistrationFailures += 1;
+      params.runtime.error?.(
+        `mattermost: failed to register slash commands for team ${team.id}: ${String(err)}`,
+      );
+    }
+  }
+
+  return { registered, teamRegistrationFailures };
+}
+
+export async function registerMattermostMonitorSlashCommands(params: {
+  client: MattermostClient;
+  cfg: OpenClawConfig;
+  runtime: RuntimeEnv;
+  account: ResolvedMattermostAccount;
+  baseUrl: string;
+  botUserId: string;
+}) {
+  const commandsRaw = params.account.config.commands as
+    | Partial<MattermostSlashCommandConfig>
+    | undefined;
+  const slashConfig = resolveSlashCommandConfig(commandsRaw);
+  if (!isSlashCommandsEnabled(slashConfig)) {
+    return;
+  }
+
+  try {
+    const teams = await fetchMattermostUserTeams(params.client, params.botUserId);
+    const envPort = parseStrictPositiveInteger(process.env.OPENCLAW_GATEWAY_PORT?.trim());
+    const slashGatewayPort = envPort ?? params.cfg.gateway?.port ?? 18789;
+    const slashCallbackUrl = resolveCallbackUrl({
+      config: slashConfig,
+      gatewayPort: slashGatewayPort,
+      gatewayHost: params.cfg.gateway?.customBindHost ?? undefined,
+    });
+
+    warnOnSuspiciousCallbackUrl({
+      runtime: params.runtime,
+      baseUrl: params.baseUrl,
+      callbackUrl: slashCallbackUrl,
+    });
+
+    const dedupedCommands = dedupeSlashCommands(
+      buildSlashCommands({
+        cfg: params.cfg,
+        runtime: params.runtime,
+        nativeSkills: slashConfig.nativeSkills === true,
+      }),
+    );
+    const { registered, teamRegistrationFailures } = await registerSlashCommandsAcrossTeams({
+      client: params.client,
+      teams,
+      botUserId: params.botUserId,
+      callbackUrl: slashCallbackUrl,
+      commands: dedupedCommands,
+      runtime: params.runtime,
+    });
+
+    if (registered.length === 0) {
+      params.runtime.error?.(
+        "mattermost: native slash commands enabled but no commands could be registered; keeping slash callbacks inactive",
+      );
+      return;
+    }
+
+    if (teamRegistrationFailures > 0) {
+      params.runtime.error?.(
+        `mattermost: slash command registration completed with ${teamRegistrationFailures} team error(s)`,
+      );
+    }
+
+    activateSlashCommands({
+      account: params.account,
+      commandTokens: registered.map((cmd) => cmd.token).filter(Boolean),
+      registeredCommands: registered,
+      triggerMap: buildTriggerMap(dedupedCommands),
+      api: { cfg: params.cfg, runtime: params.runtime },
+      log: (msg) => params.runtime.log?.(msg),
+    });
+
+    params.runtime.log?.(
+      `mattermost: slash commands registered (${registered.length} commands across ${teams.length} teams, callback=${slashCallbackUrl})`,
+    );
+  } catch (err) {
+    params.runtime.error?.(`mattermost: failed to register slash commands: ${String(err)}`);
+  }
+}

extensions/mattermost/src/mattermost/monitor-websocket.test.ts

@@ -0,0 +1,405 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import type { RuntimeEnv } from "../../runtime-api.js";
+import {
+  createMattermostConnectOnce,
+  type MattermostWebSocketLike,
+  WebSocketClosedBeforeOpenError,
+} from "./monitor-websocket.js";
+
+class FakeWebSocket implements MattermostWebSocketLike {
+  public readonly sent: string[] = [];
+  public closeCalls = 0;
+  public terminateCalls = 0;
+  private openListeners: Array<() => void> = [];
+  private messageListeners: Array<(data: Buffer) => void | Promise<void>> = [];
+  private closeListeners: Array<(code: number, reason: Buffer) => void> = [];
+  private errorListeners: Array<(err: unknown) => void> = [];
+
+  on(event: "open", listener: () => void): void;
+  on(event: "message", listener: (data: Buffer) => void | Promise<void>): void;
+  on(event: "close", listener: (code: number, reason: Buffer) => void): void;
+  on(event: "error", listener: (err: unknown) => void): void;
+  on(event: "open" | "message" | "close" | "error", listener: unknown): void {
+    if (event === "open") {
+      this.openListeners.push(listener as () => void);
+      return;
+    }
+    if (event === "message") {
+      this.messageListeners.push(listener as (data: Buffer) => void | Promise<void>);
+      return;
+    }
+    if (event === "close") {
+      this.closeListeners.push(listener as (code: number, reason: Buffer) => void);
+      return;
+    }
+    this.errorListeners.push(listener as (err: unknown) => void);
+  }
+
+  send(data: string): void {
+    this.sent.push(data);
+  }
+
+  close(): void {
+    this.closeCalls++;
+  }
+
+  terminate(): void {
+    this.terminateCalls++;
+  }
+
+  emitOpen(): void {
+    for (const listener of this.openListeners) {
+      listener();
+    }
+  }
+
+  emitMessage(data: Buffer): void {
+    for (const listener of this.messageListeners) {
+      void listener(data);
+    }
+  }
+
+  emitClose(code: number, reason = ""): void {
+    const buffer = Buffer.from(reason, "utf8");
+    for (const listener of this.closeListeners) {
+      listener(code, buffer);
+    }
+  }
+
+  emitError(err: unknown): void {
+    for (const listener of this.errorListeners) {
+      listener(err);
+    }
+  }
+}
+
+const testRuntime = (): RuntimeEnv =>
+  ({
+    log: vi.fn(),
+    error: vi.fn(),
+    exit: ((code: number): never => {
+      throw new Error(`exit ${code}`);
+    }) as RuntimeEnv["exit"],
+  }) as RuntimeEnv;
+
+describe("mattermost websocket monitor", () => {
+  beforeEach(() => {
+    vi.useRealTimers();
+  });
+
+  it("rejects when websocket closes before open", async () => {
+    const socket = new FakeWebSocket();
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime: testRuntime(),
+      nextSeq: () => 1,
+      onPosted: async () => {},
+      webSocketFactory: () => socket,
+    });
+
+    queueMicrotask(() => {
+      socket.emitClose(1006, "connection refused");
+    });
+
+    const failure = connectOnce();
+    await expect(failure).rejects.toBeInstanceOf(WebSocketClosedBeforeOpenError);
+    await expect(failure).rejects.toMatchObject({
+      message: "websocket closed before open (code 1006)",
+    });
+  });
+
+  it("retries when first attempt errors before open and next attempt succeeds", async () => {
+    const patches: Array<Record<string, unknown>> = [];
+    const sockets: FakeWebSocket[] = [];
+
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime: testRuntime(),
+      nextSeq: (() => {
+        let seq = 1;
+        return () => seq++;
+      })(),
+      onPosted: async () => {},
+      statusSink: (patch) => {
+        patches.push(patch as Record<string, unknown>);
+      },
+      webSocketFactory: () => {
+        const socket = new FakeWebSocket();
+        const attempt = sockets.length;
+        sockets.push(socket);
+        queueMicrotask(() => {
+          if (attempt === 0) {
+            socket.emitError(new Error("boom"));
+            socket.emitClose(1006, "connection refused");
+            return;
+          }
+          socket.emitOpen();
+          socket.emitClose(1000);
+        });
+        return socket;
+      },
+    });
+
+    const firstAttempt = connectOnce();
+    await expect(firstAttempt).rejects.toBeInstanceOf(WebSocketClosedBeforeOpenError);
+
+    await connectOnce();
+
+    expect(sockets).toHaveLength(2);
+    expect(sockets[0].closeCalls).toBe(1);
+    expect(sockets[1].sent).toHaveLength(1);
+    expect(JSON.parse(sockets[1].sent[0])).toMatchObject({
+      action: "authentication_challenge",
+      data: { token: "token" },
+      seq: 1,
+    });
+    expect(patches.some((patch) => patch.connected === true)).toBe(true);
+    expect(patches.filter((patch) => patch.connected === false)).toHaveLength(2);
+  });
+
+  it("dispatches reaction events to the reaction handler", async () => {
+    const socket = new FakeWebSocket();
+    const onPosted = vi.fn(async () => {});
+    const onReaction = vi.fn(async (payload) => payload);
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime: testRuntime(),
+      nextSeq: () => 1,
+      onPosted,
+      onReaction,
+      webSocketFactory: () => socket,
+    });
+
+    const connected = connectOnce();
+    queueMicrotask(() => {
+      socket.emitOpen();
+      socket.emitMessage(
+        Buffer.from(
+          JSON.stringify({
+            event: "reaction_added",
+            data: {
+              reaction: JSON.stringify({
+                user_id: "user-1",
+                post_id: "post-1",
+                emoji_name: "thumbsup",
+              }),
+            },
+          }),
+        ),
+      );
+      socket.emitClose(1000);
+    });
+
+    await connected;
+
+    expect(onReaction).toHaveBeenCalledTimes(1);
+    expect(onPosted).not.toHaveBeenCalled();
+    const payload = onReaction.mock.calls[0]?.[0];
+    expect(payload).toMatchObject({
+      event: "reaction_added",
+      data: {
+        reaction: JSON.stringify({
+          user_id: "user-1",
+          post_id: "post-1",
+          emoji_name: "thumbsup",
+        }),
+      },
+    });
+    expect(payload.data?.reaction).toBe(
+      JSON.stringify({
+        user_id: "user-1",
+        post_id: "post-1",
+        emoji_name: "thumbsup",
+      }),
+    );
+  });
+
+  it("terminates when bot update_at changes (disable/enable cycle)", async () => {
+    vi.useFakeTimers();
+    const socket = new FakeWebSocket();
+    const runtime = testRuntime();
+    let updateAt = 1000;
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime,
+      nextSeq: () => 1,
+      onPosted: async () => {},
+      webSocketFactory: () => socket,
+      getBotUpdateAt: async () => updateAt,
+      healthCheckIntervalMs: 100,
+    });
+
+    const connected = connectOnce();
+    socket.emitOpen();
+
+    // Let initial getBotUpdateAt resolve
+    await vi.advanceTimersByTimeAsync(0);
+
+    // update_at unchanged — no terminate
+    await vi.advanceTimersByTimeAsync(100);
+    expect(socket.terminateCalls).toBe(0);
+
+    // Simulate disable/enable — update_at changes
+    updateAt = 2000;
+    await vi.advanceTimersByTimeAsync(100);
+    expect(socket.terminateCalls).toBe(1);
+    expect(runtime.log).toHaveBeenCalledWith(
+      "mattermost: bot account updated (update_at changed: 1000 → 2000) — reconnecting",
+    );
+
+    socket.emitClose(1006);
+    await connected;
+    vi.useRealTimers();
+  });
+
+  it("keeps connection alive when update_at stays the same", async () => {
+    vi.useFakeTimers();
+    const socket = new FakeWebSocket();
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime: testRuntime(),
+      nextSeq: () => 1,
+      onPosted: async () => {},
+      webSocketFactory: () => socket,
+      getBotUpdateAt: async () => 1000,
+      healthCheckIntervalMs: 100,
+    });
+
+    const connected = connectOnce();
+    socket.emitOpen();
+
+    await vi.advanceTimersByTimeAsync(0);
+    await vi.advanceTimersByTimeAsync(300);
+    expect(socket.terminateCalls).toBe(0);
+
+    socket.emitClose(1000);
+    await connected;
+    vi.useRealTimers();
+  });
+
+  it("does not terminate when getBotUpdateAt throws", async () => {
+    vi.useFakeTimers();
+    const socket = new FakeWebSocket();
+    const runtime = testRuntime();
+    let shouldThrow = false;
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime,
+      nextSeq: () => 1,
+      onPosted: async () => {},
+      webSocketFactory: () => socket,
+      getBotUpdateAt: async () => {
+        if (shouldThrow) throw new Error("network error");
+        return 1000;
+      },
+      healthCheckIntervalMs: 100,
+    });
+
+    const connected = connectOnce();
+    socket.emitOpen();
+
+    await vi.advanceTimersByTimeAsync(0);
+
+    // API error — should log but not terminate
+    shouldThrow = true;
+    await vi.advanceTimersByTimeAsync(100);
+    expect(socket.terminateCalls).toBe(0);
+    expect(runtime.error).toHaveBeenCalledWith(
+      "mattermost: health check error: Error: network error",
+    );
+
+    socket.emitClose(1000);
+    await connected;
+    vi.useRealTimers();
+  });
+
+  it("keeps polling when the initial getBotUpdateAt call fails", async () => {
+    vi.useFakeTimers();
+    const socket = new FakeWebSocket();
+    const runtime = testRuntime();
+    const responses: Array<number | Error> = [new Error("network error"), 1000, 2000];
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime,
+      nextSeq: () => 1,
+      onPosted: async () => {},
+      webSocketFactory: () => socket,
+      getBotUpdateAt: async () => {
+        const next = responses.shift();
+        if (next instanceof Error) {
+          throw next;
+        }
+        return next ?? 2000;
+      },
+      healthCheckIntervalMs: 100,
+    });
+
+    const connected = connectOnce();
+    socket.emitOpen();
+
+    await vi.advanceTimersByTimeAsync(0);
+    expect(runtime.error).toHaveBeenCalledWith(
+      "mattermost: failed to get initial update_at: Error: network error",
+    );
+
+    await vi.advanceTimersByTimeAsync(100);
+    expect(socket.terminateCalls).toBe(0);
+
+    await vi.advanceTimersByTimeAsync(100);
+    expect(socket.terminateCalls).toBe(1);
+    expect(runtime.log).toHaveBeenCalledWith(
+      "mattermost: bot account updated (update_at changed: 1000 → 2000) — reconnecting",
+    );
+
+    socket.emitClose(1006);
+    await connected;
+    vi.useRealTimers();
+  });
+
+  it("does not overlap health checks when a prior poll is still running", async () => {
+    vi.useFakeTimers();
+    const socket = new FakeWebSocket();
+    const resolvers: Array<(value: number) => void> = [];
+    let pollCount = 0;
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime: testRuntime(),
+      nextSeq: () => 1,
+      onPosted: async () => {},
+      webSocketFactory: () => socket,
+      getBotUpdateAt: async () => {
+        pollCount++;
+        return await new Promise<number>((resolve) => {
+          resolvers.push(resolve);
+        });
+      },
+      healthCheckIntervalMs: 100,
+    });
+
+    const connected = connectOnce();
+    socket.emitOpen();
+
+    await vi.advanceTimersByTimeAsync(0);
+    expect(pollCount).toBe(1);
+
+    await vi.advanceTimersByTimeAsync(300);
+    expect(pollCount).toBe(1);
+
+    resolvers[0]?.(1000);
+    await vi.advanceTimersByTimeAsync(0);
+    await vi.advanceTimersByTimeAsync(100);
+    expect(pollCount).toBe(2);
+
+    socket.emitClose(1000);
+    await connected;
+    vi.useRealTimers();
+  });
+});

extensions/mattermost/src/mattermost/monitor-websocket.ts

@@ -0,0 +1,329 @@
+import { safeParseJsonWithSchema, safeParseWithSchema } from "openclaw/plugin-sdk/extension-shared";
+import { z } from "openclaw/plugin-sdk/zod";
+import WebSocket from "ws";
+import { MattermostPostSchema, type MattermostPost } from "./client.js";
+import { rawDataToString } from "./monitor-helpers.js";
+import type { ChannelAccountSnapshot, RuntimeEnv } from "./runtime-api.js";
+
+export type MattermostEventPayload = {
+  event?: string;
+  data?: {
+    post?: string | MattermostPost;
+    reaction?: string | Record<string, unknown>;
+    channel_id?: string;
+    channel_name?: string;
+    channel_display_name?: string;
+    channel_type?: string;
+    sender_name?: string;
+    team_id?: string;
+  };
+  broadcast?: {
+    channel_id?: string;
+    team_id?: string;
+    user_id?: string;
+  };
+};
+
+export type MattermostWebSocketLike = {
+  on(event: "open", listener: () => void): void;
+  on(event: "message", listener: (data: WebSocket.RawData) => void | Promise<void>): void;
+  on(event: "close", listener: (code: number, reason: Buffer) => void): void;
+  on(event: "error", listener: (err: unknown) => void): void;
+  send(data: string): void;
+  close(): void;
+  terminate(): void;
+};
+
+export type MattermostWebSocketFactory = (url: string) => MattermostWebSocketLike;
+const MattermostEventPayloadSchema = z.object({
+  event: z.string().optional(),
+  data: z
+    .object({
+      post: z.union([z.string(), MattermostPostSchema]).optional(),
+      reaction: z.union([z.string(), z.record(z.string(), z.unknown())]).optional(),
+      channel_id: z.string().optional(),
+      channel_name: z.string().optional(),
+      channel_display_name: z.string().optional(),
+      channel_type: z.string().optional(),
+      sender_name: z.string().optional(),
+      team_id: z.string().optional(),
+    })
+    .optional(),
+  broadcast: z
+    .object({
+      channel_id: z.string().optional(),
+      team_id: z.string().optional(),
+      user_id: z.string().optional(),
+    })
+    .optional(),
+}) as z.ZodType<MattermostEventPayload>;
+
+function parseMattermostEventPayload(raw: string): MattermostEventPayload | null {
+  return safeParseJsonWithSchema(MattermostEventPayloadSchema, raw);
+}
+
+function parseMattermostPost(value: unknown): MattermostPost | null {
+  if (typeof value === "string") {
+    return safeParseJsonWithSchema(MattermostPostSchema, value);
+  }
+  return safeParseWithSchema(MattermostPostSchema, value);
+}
+
+export class WebSocketClosedBeforeOpenError extends Error {
+  constructor(
+    public readonly code: number,
+    public readonly reason?: string,
+  ) {
+    super(`websocket closed before open (code ${code})`);
+    this.name = "WebSocketClosedBeforeOpenError";
+  }
+}
+
+type CreateMattermostConnectOnceOpts = {
+  wsUrl: string;
+  botToken: string;
+  abortSignal?: AbortSignal;
+  statusSink?: (patch: Partial<ChannelAccountSnapshot>) => void;
+  runtime: RuntimeEnv;
+  nextSeq: () => number;
+  onPosted: (post: MattermostPost, payload: MattermostEventPayload) => Promise<void>;
+  onReaction?: (payload: MattermostEventPayload) => Promise<void>;
+  webSocketFactory?: MattermostWebSocketFactory;
+  /**
+   * Called periodically to check whether the bot account has been modified
+   * (e.g. disabled then re-enabled) since the WebSocket was opened.
+   * Returns the bot's current `update_at` timestamp.  When it differs from
+   * the value recorded at connect time, the connection is terminated so the
+   * reconnect loop can establish a fresh one.
+   */
+  getBotUpdateAt?: () => Promise<number>;
+  healthCheckIntervalMs?: number;
+};
+
+export const defaultMattermostWebSocketFactory: MattermostWebSocketFactory = (url) =>
+  new WebSocket(url) as MattermostWebSocketLike;
+
+export function parsePostedPayload(
+  payload: MattermostEventPayload,
+): { payload: MattermostEventPayload; post: MattermostPost } | null {
+  if (payload.event !== "posted") {
+    return null;
+  }
+  const postData = payload.data?.post;
+  if (!postData) {
+    return null;
+  }
+  const post = parseMattermostPost(postData);
+  if (!post) {
+    return null;
+  }
+  return { payload, post };
+}
+
+export function parsePostedEvent(
+  data: WebSocket.RawData,
+): { payload: MattermostEventPayload; post: MattermostPost } | null {
+  const raw = rawDataToString(data);
+  const payload = parseMattermostEventPayload(raw);
+  if (!payload) {
+    return null;
+  }
+  return parsePostedPayload(payload);
+}
+
+export function createMattermostConnectOnce(
+  opts: CreateMattermostConnectOnceOpts,
+): () => Promise<void> {
+  const webSocketFactory = opts.webSocketFactory ?? defaultMattermostWebSocketFactory;
+  const healthCheckIntervalMs = opts.healthCheckIntervalMs ?? 30_000;
+  return async () => {
+    const ws = webSocketFactory(opts.wsUrl);
+    const onAbort = () => ws.terminate();
+    opts.abortSignal?.addEventListener("abort", onAbort, { once: true });
+    const getBotUpdateAt = opts.getBotUpdateAt;
+
+    try {
+      return await new Promise<void>((resolve, reject) => {
+        let opened = false;
+        let settled = false;
+        let healthCheckEnabled = getBotUpdateAt != null;
+        let healthCheckInFlight = false;
+        let healthCheckTimer: ReturnType<typeof setTimeout> | undefined;
+        let initialUpdateAt: number | undefined;
+
+        const clearTimers = () => {
+          if (healthCheckTimer !== undefined) {
+            clearTimeout(healthCheckTimer);
+            healthCheckTimer = undefined;
+          }
+        };
+
+        const stopHealthChecks = () => {
+          healthCheckEnabled = false;
+          clearTimers();
+        };
+
+        const scheduleHealthCheck = () => {
+          if (!getBotUpdateAt || !healthCheckEnabled || settled || healthCheckInFlight) {
+            return;
+          }
+          healthCheckTimer = setTimeout(() => {
+            healthCheckTimer = undefined;
+            void runHealthCheck();
+          }, healthCheckIntervalMs);
+        };
+
+        const runHealthCheck = async () => {
+          if (!getBotUpdateAt || !healthCheckEnabled || settled || healthCheckInFlight) {
+            return;
+          }
+          healthCheckInFlight = true;
+          try {
+            const current = await getBotUpdateAt();
+            if (!healthCheckEnabled || settled) {
+              return;
+            }
+            if (initialUpdateAt === undefined) {
+              initialUpdateAt = current;
+              return;
+            }
+            if (current !== initialUpdateAt) {
+              opts.runtime.log?.(
+                `mattermost: bot account updated (update_at changed: ${initialUpdateAt} → ${current}) — reconnecting`,
+              );
+              stopHealthChecks();
+              ws.terminate();
+            }
+          } catch (err) {
+            if (!healthCheckEnabled || settled) {
+              return;
+            }
+            const label =
+              initialUpdateAt === undefined
+                ? "mattermost: failed to get initial update_at"
+                : "mattermost: health check error";
+            opts.runtime.error?.(`${label}: ${String(err)}`);
+          } finally {
+            healthCheckInFlight = false;
+            scheduleHealthCheck();
+          }
+        };
+
+        const resolveOnce = () => {
+          if (settled) {
+            return;
+          }
+          settled = true;
+          stopHealthChecks();
+          resolve();
+        };
+        const rejectOnce = (error: Error) => {
+          if (settled) {
+            return;
+          }
+          settled = true;
+          stopHealthChecks();
+          reject(error);
+        };
+
+        ws.on("open", () => {
+          opened = true;
+          opts.statusSink?.({
+            connected: true,
+            lastConnectedAt: Date.now(),
+            lastError: null,
+          });
+          ws.send(
+            JSON.stringify({
+              seq: opts.nextSeq(),
+              action: "authentication_challenge",
+              data: { token: opts.botToken },
+            }),
+          );
+
+          // Periodically check if the bot account was modified (e.g. disable/enable).
+          // After such a cycle the WebSocket silently stops delivering events even
+          // though the connection itself stays alive.  Comparing update_at detects
+          // this reliably regardless of how quickly the cycle happens.
+          if (getBotUpdateAt) {
+            // Use a recursive timeout so only one REST poll can be in flight at a time.
+            void runHealthCheck();
+          }
+        });
+
+        ws.on("message", async (data) => {
+          const raw = rawDataToString(data);
+          const payload = parseMattermostEventPayload(raw);
+          if (!payload) {
+            return;
+          }
+
+          if (payload.event === "reaction_added" || payload.event === "reaction_removed") {
+            if (!opts.onReaction) {
+              return;
+            }
+            try {
+              await opts.onReaction(payload);
+            } catch (err) {
+              opts.runtime.error?.(`mattermost reaction handler failed: ${String(err)}`);
+            }
+            return;
+          }
+
+          if (payload.event !== "posted") {
+            return;
+          }
+          const parsed = parsePostedPayload(payload);
+          if (!parsed) {
+            return;
+          }
+          try {
+            await opts.onPosted(parsed.post, parsed.payload);
+          } catch (err) {
+            opts.runtime.error?.(`mattermost handler failed: ${String(err)}`);
+          }
+        });
+
+        ws.on("close", (code, reason) => {
+          stopHealthChecks();
+          const message = reasonToString(reason);
+          opts.statusSink?.({
+            connected: false,
+            lastDisconnect: {
+              at: Date.now(),
+              status: code,
+              error: message || undefined,
+            },
+          });
+          if (opened) {
+            resolveOnce();
+            return;
+          }
+          rejectOnce(new WebSocketClosedBeforeOpenError(code, message || undefined));
+        });
+
+        ws.on("error", (err) => {
+          opts.runtime.error?.(`mattermost websocket error: ${String(err)}`);
+          opts.statusSink?.({
+            lastError: String(err),
+          });
+          try {
+            ws.close();
+          } catch {}
+        });
+      });
+    } finally {
+      opts.abortSignal?.removeEventListener("abort", onAbort);
+    }
+  };
+}
+
+function reasonToString(reason: Buffer | string | undefined): string {
+  if (!reason) {
+    return "";
+  }
+  if (typeof reason === "string") {
+    return reason;
+  }
+  return reason.length > 0 ? reason.toString("utf8") : "";
+}

extensions/mattermost/src/mattermost/monitor.authz.test.ts

@@ -0,0 +1,123 @@
+import { describe, expect, it } from "vitest";
+import { resolveControlCommandGate } from "../../runtime-api.js";
+import type { ResolvedMattermostAccount } from "./accounts.js";
+import {
+  authorizeMattermostCommandInvocation,
+  resolveMattermostEffectiveAllowFromLists,
+} from "./monitor-auth.js";
+
+const accountFixture: ResolvedMattermostAccount = {
+  accountId: "default",
+  enabled: true,
+  // pragma: allowlist secret
+  botToken: "bot-token",
+  baseUrl: "https://chat.example.com",
+  botTokenSource: "config",
+  baseUrlSource: "config",
+  config: {},
+};
+
+function authorizeGroupCommand(senderId: string) {
+  return authorizeMattermostCommandInvocation({
+    account: {
+      ...accountFixture,
+      config: {
+        groupPolicy: "allowlist",
+        allowFrom: ["trusted-user"],
+      },
+    },
+    cfg: {
+      commands: {
+        useAccessGroups: true,
+      },
+    },
+    senderId,
+    senderName: senderId,
+    channelId: "chan-1",
+    channelInfo: {
+      id: "chan-1",
+      type: "O",
+      name: "general",
+      display_name: "General",
+    },
+    storeAllowFrom: [],
+    allowTextCommands: true,
+    hasControlCommand: true,
+  });
+}
+
+describe("mattermost monitor authz", () => {
+  it("keeps DM allowlist merged with pairing-store entries", () => {
+    const resolved = resolveMattermostEffectiveAllowFromLists({
+      dmPolicy: "pairing",
+      allowFrom: ["@trusted-user"],
+      groupAllowFrom: ["@group-owner"],
+      storeAllowFrom: ["user:attacker"],
+    });
+
+    expect(resolved.effectiveAllowFrom).toEqual(["trusted-user", "attacker"]);
+  });
+
+  it("uses explicit groupAllowFrom without pairing-store inheritance", () => {
+    const resolved = resolveMattermostEffectiveAllowFromLists({
+      dmPolicy: "pairing",
+      allowFrom: ["@trusted-user"],
+      groupAllowFrom: ["@group-owner"],
+      storeAllowFrom: ["user:attacker"],
+    });
+
+    expect(resolved.effectiveGroupAllowFrom).toEqual(["group-owner"]);
+  });
+
+  it("does not inherit pairing-store entries into group allowlist", () => {
+    const resolved = resolveMattermostEffectiveAllowFromLists({
+      dmPolicy: "pairing",
+      allowFrom: ["@trusted-user"],
+      storeAllowFrom: ["user:attacker"],
+    });
+
+    expect(resolved.effectiveAllowFrom).toEqual(["trusted-user", "attacker"]);
+    expect(resolved.effectiveGroupAllowFrom).toEqual(["trusted-user"]);
+  });
+
+  it("does not auto-authorize DM commands in open mode without allowlists", () => {
+    const resolved = resolveMattermostEffectiveAllowFromLists({
+      dmPolicy: "open",
+      allowFrom: [],
+      groupAllowFrom: [],
+      storeAllowFrom: [],
+    });
+
+    const commandGate = resolveControlCommandGate({
+      useAccessGroups: true,
+      authorizers: [
+        { configured: resolved.effectiveAllowFrom.length > 0, allowed: false },
+        { configured: resolved.effectiveGroupAllowFrom.length > 0, allowed: false },
+      ],
+      allowTextCommands: true,
+      hasControlCommand: true,
+    });
+
+    expect(commandGate.commandAuthorized).toBe(false);
+  });
+
+  it("denies group control commands when the sender is outside the allowlist", () => {
+    const decision = authorizeGroupCommand("attacker");
+
+    expect(decision).toMatchObject({
+      ok: false,
+      denyReason: "unauthorized",
+      kind: "channel",
+    });
+  });
+
+  it("authorizes group control commands for allowlisted senders", () => {
+    const decision = authorizeGroupCommand("trusted-user");
+
+    expect(decision).toMatchObject({
+      ok: true,
+      commandAuthorized: true,
+      kind: "channel",
+    });
+  });
+});

extensions/mattermost/src/mattermost/monitor.channel-kind.test.ts

@@ -0,0 +1,20 @@
+import { describe, expect, it } from "vitest";
+import { mapMattermostChannelTypeToChatType } from "./monitor.js";
+
+describe("mapMattermostChannelTypeToChatType", () => {
+  it("maps direct and group dm channel types", () => {
+    expect(mapMattermostChannelTypeToChatType("D")).toBe("direct");
+    expect(mapMattermostChannelTypeToChatType("g")).toBe("group");
+  });
+
+  it("maps private channels to group", () => {
+    expect(mapMattermostChannelTypeToChatType("P")).toBe("group");
+    expect(mapMattermostChannelTypeToChatType(" p ")).toBe("group");
+  });
+
+  it("keeps public channels and unknown values as channel", () => {
+    expect(mapMattermostChannelTypeToChatType("O")).toBe("channel");
+    expect(mapMattermostChannelTypeToChatType("x")).toBe("channel");
+    expect(mapMattermostChannelTypeToChatType(undefined)).toBe("channel");
+  });
+});

extensions/mattermost/src/mattermost/monitor.test.ts

@@ -0,0 +1,300 @@
+import { describe, expect, it, vi } from "vitest";
+import type { OpenClawConfig } from "../../runtime-api.js";
+import { resolveMattermostAccount } from "./accounts.js";
+import {
+  evaluateMattermostMentionGate,
+  resolveMattermostReactionChannelId,
+  resolveMattermostEffectiveReplyToId,
+  resolveMattermostReplyRootId,
+  resolveMattermostThreadSessionContext,
+  type MattermostMentionGateInput,
+  type MattermostRequireMentionResolverInput,
+} from "./monitor.js";
+
+function resolveRequireMentionForTest(params: MattermostRequireMentionResolverInput): boolean {
+  const root = params.cfg.channels?.mattermost;
+  const accountGroups = root?.accounts?.[params.accountId]?.groups;
+  const groups = accountGroups ?? root?.groups;
+  const groupConfig = params.groupId ? groups?.[params.groupId] : undefined;
+  const defaultGroupConfig = groups?.["*"];
+  const configMention =
+    typeof groupConfig?.requireMention === "boolean"
+      ? groupConfig.requireMention
+      : typeof defaultGroupConfig?.requireMention === "boolean"
+        ? defaultGroupConfig.requireMention
+        : undefined;
+  if (typeof configMention === "boolean") {
+    return configMention;
+  }
+  if (typeof params.requireMentionOverride === "boolean") {
+    return params.requireMentionOverride;
+  }
+  return true;
+}
+
+function evaluateMentionGateForMessage(params: { cfg: OpenClawConfig; threadRootId?: string }) {
+  const account = resolveMattermostAccount({ cfg: params.cfg, accountId: "default" });
+  const resolver = vi.fn(resolveRequireMentionForTest);
+  const input: MattermostMentionGateInput = {
+    kind: "channel",
+    cfg: params.cfg,
+    accountId: account.accountId,
+    channelId: "chan-1",
+    threadRootId: params.threadRootId,
+    requireMentionOverride: account.requireMention,
+    resolveRequireMention: resolver,
+    wasMentioned: false,
+    isControlCommand: false,
+    commandAuthorized: false,
+    oncharEnabled: false,
+    oncharTriggered: false,
+    canDetectMention: true,
+  };
+  const decision = evaluateMattermostMentionGate(input);
+  return { account, resolver, decision };
+}
+
+describe("mattermost mention gating", () => {
+  it("accepts unmentioned root channel posts in onmessage mode", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          chatmode: "onmessage",
+          groupPolicy: "open",
+        },
+      },
+    };
+    const { resolver, decision } = evaluateMentionGateForMessage({ cfg });
+    expect(decision.dropReason).toBeNull();
+    expect(decision.shouldRequireMention).toBe(false);
+    expect(resolver).toHaveBeenCalledWith(
+      expect.objectContaining({
+        accountId: "default",
+        groupId: "chan-1",
+        requireMentionOverride: false,
+      }),
+    );
+  });
+
+  it("accepts unmentioned thread replies in onmessage mode", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          chatmode: "onmessage",
+          groupPolicy: "open",
+        },
+      },
+    };
+    const { resolver, decision } = evaluateMentionGateForMessage({
+      cfg,
+      threadRootId: "thread-root-1",
+    });
+    expect(decision.dropReason).toBeNull();
+    expect(decision.shouldRequireMention).toBe(false);
+    const resolverCall = resolver.mock.calls.at(-1)?.[0];
+    expect(resolverCall?.groupId).toBe("chan-1");
+    expect(resolverCall?.groupId).not.toBe("thread-root-1");
+  });
+
+  it("rejects unmentioned channel posts in oncall mode", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          chatmode: "oncall",
+          groupPolicy: "open",
+        },
+      },
+    };
+    const { decision, account } = evaluateMentionGateForMessage({ cfg });
+    expect(account.requireMention).toBe(true);
+    expect(decision.shouldRequireMention).toBe(true);
+    expect(decision.dropReason).toBe("missing-mention");
+  });
+});
+
+describe("resolveMattermostReplyRootId with block streaming payloads", () => {
+  it("uses threadRootId for block-streamed payloads with replyToId", () => {
+    // When block streaming sends a payload with replyToId from the threading
+    // mode, the deliver callback should still use the existing threadRootId.
+    expect(
+      resolveMattermostReplyRootId({
+        threadRootId: "thread-root-1",
+        replyToId: "streamed-reply-id",
+      }),
+    ).toBe("thread-root-1");
+  });
+
+  it("falls back to payload replyToId when no threadRootId in block streaming", () => {
+    // Top-level channel message: no threadRootId, payload carries the
+    // inbound post id as replyToId from the "all" threading mode.
+    expect(
+      resolveMattermostReplyRootId({
+        replyToId: "inbound-post-for-threading",
+      }),
+    ).toBe("inbound-post-for-threading");
+  });
+});
+
+describe("resolveMattermostReplyRootId", () => {
+  it("uses replyToId for top-level replies", () => {
+    expect(
+      resolveMattermostReplyRootId({
+        replyToId: "inbound-post-123",
+      }),
+    ).toBe("inbound-post-123");
+  });
+
+  it("keeps the thread root when replying inside an existing thread", () => {
+    expect(
+      resolveMattermostReplyRootId({
+        threadRootId: "thread-root-456",
+        replyToId: "child-post-789",
+      }),
+    ).toBe("thread-root-456");
+  });
+
+  it("falls back to undefined when neither reply target is available", () => {
+    expect(resolveMattermostReplyRootId({})).toBeUndefined();
+  });
+});
+
+describe("resolveMattermostEffectiveReplyToId", () => {
+  it("keeps an existing thread root", () => {
+    expect(
+      resolveMattermostEffectiveReplyToId({
+        kind: "channel",
+        postId: "post-123",
+        replyToMode: "all",
+        threadRootId: "thread-root-456",
+      }),
+    ).toBe("thread-root-456");
+  });
+
+  it("suppresses existing thread roots when replyToMode is off", () => {
+    expect(
+      resolveMattermostEffectiveReplyToId({
+        kind: "channel",
+        postId: "post-123",
+        replyToMode: "off",
+        threadRootId: "thread-root-456",
+      }),
+    ).toBeUndefined();
+  });
+
+  it("starts a thread for top-level channel messages when replyToMode is all", () => {
+    expect(
+      resolveMattermostEffectiveReplyToId({
+        kind: "channel",
+        postId: "post-123",
+        replyToMode: "all",
+      }),
+    ).toBe("post-123");
+  });
+
+  it("starts a thread for top-level group messages when replyToMode is first", () => {
+    expect(
+      resolveMattermostEffectiveReplyToId({
+        kind: "group",
+        postId: "post-123",
+        replyToMode: "first",
+      }),
+    ).toBe("post-123");
+  });
+
+  it("keeps direct messages non-threaded", () => {
+    expect(
+      resolveMattermostEffectiveReplyToId({
+        kind: "direct",
+        postId: "post-123",
+        replyToMode: "all",
+      }),
+    ).toBeUndefined();
+  });
+});
+
+describe("resolveMattermostThreadSessionContext", () => {
+  it("forks channel sessions by top-level post when replyToMode is all", () => {
+    expect(
+      resolveMattermostThreadSessionContext({
+        baseSessionKey: "agent:main:mattermost:default:chan-1",
+        kind: "channel",
+        postId: "post-123",
+        replyToMode: "all",
+      }),
+    ).toEqual({
+      effectiveReplyToId: "post-123",
+      sessionKey: "agent:main:mattermost:default:chan-1:thread:post-123",
+      parentSessionKey: "agent:main:mattermost:default:chan-1",
+    });
+  });
+
+  it("keeps existing thread roots for threaded follow-ups", () => {
+    expect(
+      resolveMattermostThreadSessionContext({
+        baseSessionKey: "agent:main:mattermost:default:chan-1",
+        kind: "group",
+        postId: "post-123",
+        replyToMode: "first",
+        threadRootId: "root-456",
+      }),
+    ).toEqual({
+      effectiveReplyToId: "root-456",
+      sessionKey: "agent:main:mattermost:default:chan-1:thread:root-456",
+      parentSessionKey: "agent:main:mattermost:default:chan-1",
+    });
+  });
+
+  it("keeps threaded messages top-level when replyToMode is off", () => {
+    expect(
+      resolveMattermostThreadSessionContext({
+        baseSessionKey: "agent:main:mattermost:default:chan-1",
+        kind: "group",
+        postId: "post-123",
+        replyToMode: "off",
+        threadRootId: "root-456",
+      }),
+    ).toEqual({
+      effectiveReplyToId: undefined,
+      sessionKey: "agent:main:mattermost:default:chan-1",
+      parentSessionKey: undefined,
+    });
+  });
+
+  it("keeps direct-message sessions linear", () => {
+    expect(
+      resolveMattermostThreadSessionContext({
+        baseSessionKey: "agent:main:mattermost:default:user-1",
+        kind: "direct",
+        postId: "post-123",
+        replyToMode: "all",
+      }),
+    ).toEqual({
+      effectiveReplyToId: undefined,
+      sessionKey: "agent:main:mattermost:default:user-1",
+      parentSessionKey: undefined,
+    });
+  });
+});
+
+describe("resolveMattermostReactionChannelId", () => {
+  it("prefers broadcast channel_id when present", () => {
+    expect(
+      resolveMattermostReactionChannelId({
+        broadcast: { channel_id: "chan-broadcast" },
+        data: { channel_id: "chan-data" },
+      }),
+    ).toBe("chan-broadcast");
+  });
+
+  it("falls back to data.channel_id when broadcast channel_id is missing", () => {
+    expect(
+      resolveMattermostReactionChannelId({
+        data: { channel_id: "chan-data" },
+      }),
+    ).toBe("chan-data");
+  });
+
+  it("returns undefined when neither payload location includes channel_id", () => {
+    expect(resolveMattermostReactionChannelId({})).toBeUndefined();
+  });
+});

extensions/mattermost/src/mattermost/probe.test.ts

@@ -0,0 +1,136 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { probeMattermost } from "./probe.js";
+
+const { mockFetchGuard, mockRelease } = vi.hoisted(() => ({
+  mockFetchGuard: vi.fn(),
+  mockRelease: vi.fn(async () => {}),
+}));
+
+vi.mock("openclaw/plugin-sdk/ssrf-runtime", async () => {
+  const original = (await vi.importActual("openclaw/plugin-sdk/ssrf-runtime")) as Record<
+    string,
+    unknown
+  >;
+  return { ...original, fetchWithSsrFGuard: mockFetchGuard };
+});
+
+describe("probeMattermost", () => {
+  beforeEach(() => {
+    mockFetchGuard.mockReset();
+    mockRelease.mockClear();
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  it("returns baseUrl missing for empty base URL", async () => {
+    await expect(probeMattermost(" ", "token")).resolves.toEqual({
+      ok: false,
+      error: "baseUrl missing",
+    });
+    expect(mockFetchGuard).not.toHaveBeenCalled();
+  });
+
+  it("normalizes base URL and returns bot info", async () => {
+    mockFetchGuard.mockResolvedValueOnce({
+      response: new Response(JSON.stringify({ id: "bot-1", username: "clawbot" }), {
+        status: 200,
+        headers: { "content-type": "application/json" },
+      }),
+      release: mockRelease,
+    });
+
+    // pragma: allowlist secret
+    const result = await probeMattermost("https://mm.example.com/api/v4/", "bot-token");
+
+    expect(mockFetchGuard).toHaveBeenCalledWith({
+      url: "https://mm.example.com/api/v4/users/me",
+      init: expect.objectContaining({
+        headers: { Authorization: "Bearer bot-token" },
+      }),
+      auditContext: "mattermost-probe",
+      policy: undefined,
+    });
+    expect(result).toEqual(
+      expect.objectContaining({
+        ok: true,
+        status: 200,
+        bot: { id: "bot-1", username: "clawbot" },
+      }),
+    );
+    expect(result.elapsedMs).toBeGreaterThanOrEqual(0);
+    expect(mockRelease).toHaveBeenCalledTimes(1);
+  });
+
+  it("forwards allowPrivateNetwork to the SSRF guard policy", async () => {
+    mockFetchGuard.mockResolvedValueOnce({
+      response: new Response(JSON.stringify({ id: "bot-1" }), {
+        status: 200,
+        headers: { "content-type": "application/json" },
+      }),
+      release: mockRelease,
+    });
+
+    // pragma: allowlist secret
+    await probeMattermost("https://mm.example.com", "bot-token", 2500, true);
+
+    expect(mockFetchGuard).toHaveBeenCalledWith(
+      expect.objectContaining({
+        policy: { allowPrivateNetwork: true },
+      }),
+    );
+  });
+
+  it("returns API error details from JSON response", async () => {
+    mockFetchGuard.mockResolvedValueOnce({
+      response: new Response(JSON.stringify({ message: "invalid auth token" }), {
+        status: 401,
+        statusText: "Unauthorized",
+        headers: { "content-type": "application/json" },
+      }),
+      release: mockRelease,
+    });
+
+    await expect(probeMattermost("https://mm.example.com", "bad-token")).resolves.toEqual(
+      expect.objectContaining({
+        ok: false,
+        status: 401,
+        error: "invalid auth token",
+      }),
+    );
+    expect(mockRelease).toHaveBeenCalledTimes(1);
+  });
+
+  it("falls back to statusText when error body is empty", async () => {
+    mockFetchGuard.mockResolvedValueOnce({
+      response: new Response("", {
+        status: 403,
+        statusText: "Forbidden",
+        headers: { "content-type": "text/plain" },
+      }),
+      release: mockRelease,
+    });
+
+    await expect(probeMattermost("https://mm.example.com", "token")).resolves.toEqual(
+      expect.objectContaining({
+        ok: false,
+        status: 403,
+        error: "Forbidden",
+      }),
+    );
+    expect(mockRelease).toHaveBeenCalledTimes(1);
+  });
+
+  it("returns fetch error when request throws", async () => {
+    mockFetchGuard.mockRejectedValueOnce(new Error("network down"));
+
+    await expect(probeMattermost("https://mm.example.com", "token")).resolves.toEqual(
+      expect.objectContaining({
+        ok: false,
+        status: null,
+        error: "network down",
+      }),
+    );
+  });
+});

extensions/mattermost/src/mattermost/probe.ts

@@ -0,0 +1,72 @@
+import { fetchWithSsrFGuard } from "openclaw/plugin-sdk/ssrf-runtime";
+import { normalizeMattermostBaseUrl, readMattermostError, type MattermostUser } from "./client.js";
+import type { BaseProbeResult } from "./runtime-api.js";
+
+export type MattermostProbe = BaseProbeResult & {
+  status?: number | null;
+  elapsedMs?: number | null;
+  bot?: MattermostUser;
+};
+
+export async function probeMattermost(
+  baseUrl: string,
+  botToken: string,
+  timeoutMs = 2500,
+  allowPrivateNetwork = false,
+): Promise<MattermostProbe> {
+  const normalized = normalizeMattermostBaseUrl(baseUrl);
+  if (!normalized) {
+    return { ok: false, error: "baseUrl missing" };
+  }
+  const url = `${normalized}/api/v4/users/me`;
+  const start = Date.now();
+  const controller = timeoutMs > 0 ? new AbortController() : undefined;
+  let timer: NodeJS.Timeout | null = null;
+  if (controller) {
+    timer = setTimeout(() => controller.abort(), timeoutMs);
+  }
+  try {
+    const { response: res, release } = await fetchWithSsrFGuard({
+      url,
+      init: {
+        headers: { Authorization: `Bearer ${botToken}` },
+        signal: controller?.signal,
+      },
+      auditContext: "mattermost-probe",
+      policy: allowPrivateNetwork ? { allowPrivateNetwork: true } : undefined,
+    });
+    try {
+      const elapsedMs = Date.now() - start;
+      if (!res.ok) {
+        const detail = await readMattermostError(res);
+        return {
+          ok: false,
+          status: res.status,
+          error: detail || res.statusText,
+          elapsedMs,
+        };
+      }
+      const bot = (await res.json()) as MattermostUser;
+      return {
+        ok: true,
+        status: res.status,
+        elapsedMs,
+        bot,
+      };
+    } finally {
+      await release();
+    }
+  } catch (err) {
+    const message = err instanceof Error ? err.message : String(err);
+    return {
+      ok: false,
+      status: null,
+      error: message,
+      elapsedMs: Date.now() - start,
+    };
+  } finally {
+    if (timer) {
+      clearTimeout(timer);
+    }
+  }
+}

extensions/mattermost/src/mattermost/reactions.test-helpers.ts

@@ -0,0 +1,88 @@
+import { expect, vi } from "vitest";
+import type { OpenClawConfig } from "../../runtime-api.js";
+import type { MattermostFetch } from "./client.js";
+
+export function createMattermostTestConfig(): OpenClawConfig {
+  return {
+    channels: {
+      mattermost: {
+        enabled: true,
+        botToken: "test-token",
+        baseUrl: "https://chat.example.com",
+      },
+    },
+  };
+}
+
+export function createMattermostReactionFetchMock(params: {
+  postId: string;
+  emojiName: string;
+  mode: "add" | "remove" | "both";
+  userId?: string;
+  status?: number;
+  body?: unknown;
+}) {
+  const userId = params.userId ?? "BOT123";
+  const mode = params.mode;
+  const allowAdd = mode === "add" || mode === "both";
+  const allowRemove = mode === "remove" || mode === "both";
+  const addStatus = params.status ?? 201;
+  const removeStatus = params.status ?? 204;
+  const removePath = `/api/v4/users/${userId}/posts/${params.postId}/reactions/${encodeURIComponent(params.emojiName)}`;
+
+  return vi.fn<typeof fetch>(async (url, init) => {
+    if (String(url).endsWith("/api/v4/users/me")) {
+      return new Response(JSON.stringify({ id: userId }), {
+        status: 200,
+        headers: { "content-type": "application/json" },
+      });
+    }
+
+    if (allowAdd && String(url).endsWith("/api/v4/reactions")) {
+      expect(init?.method).toBe("POST");
+      const requestBody = init?.body;
+      if (typeof requestBody !== "string") {
+        throw new Error("expected string POST body");
+      }
+      expect(JSON.parse(requestBody)).toEqual({
+        user_id: userId,
+        post_id: params.postId,
+        emoji_name: params.emojiName,
+      });
+
+      const responseBody = params.body === undefined ? { ok: true } : params.body;
+      return new Response(
+        responseBody === null ? null : JSON.stringify(responseBody),
+        responseBody === null
+          ? { status: addStatus, headers: { "content-type": "text/plain" } }
+          : { status: addStatus, headers: { "content-type": "application/json" } },
+      );
+    }
+
+    if (allowRemove && String(url).endsWith(removePath)) {
+      expect(init?.method).toBe("DELETE");
+      const responseBody = params.body === undefined ? null : params.body;
+      return new Response(
+        responseBody === null ? null : JSON.stringify(responseBody),
+        responseBody === null
+          ? { status: removeStatus, headers: { "content-type": "text/plain" } }
+          : { status: removeStatus, headers: { "content-type": "application/json" } },
+      );
+    }
+
+    throw new Error(`unexpected url: ${url}`);
+  });
+}
+
+export async function withMockedGlobalFetch<T>(
+  fetchImpl: MattermostFetch,
+  run: () => Promise<T>,
+): Promise<T> {
+  const prevFetch = globalThis.fetch;
+  globalThis.fetch = fetchImpl;
+  try {
+    return await run();
+  } finally {
+    globalThis.fetch = prevFetch;
+  }
+}

extensions/mattermost/src/mattermost/reactions.test.ts

@@ -0,0 +1,106 @@
+import { beforeEach, describe, expect, it } from "vitest";
+import {
+  addMattermostReaction,
+  removeMattermostReaction,
+  resetMattermostReactionBotUserCacheForTests,
+} from "./reactions.js";
+import {
+  createMattermostReactionFetchMock,
+  createMattermostTestConfig,
+} from "./reactions.test-helpers.js";
+
+describe("mattermost reactions", () => {
+  beforeEach(() => {
+    resetMattermostReactionBotUserCacheForTests();
+  });
+
+  async function addReactionWithFetch(fetchMock: typeof fetch) {
+    return addMattermostReaction({
+      cfg: createMattermostTestConfig(),
+      postId: "POST1",
+      emojiName: "thumbsup",
+      fetchImpl: fetchMock,
+    });
+  }
+
+  async function removeReactionWithFetch(fetchMock: typeof fetch) {
+    return removeMattermostReaction({
+      cfg: createMattermostTestConfig(),
+      postId: "POST1",
+      emojiName: "thumbsup",
+      fetchImpl: fetchMock,
+    });
+  }
+
+  it("adds reactions by calling /users/me then POST /reactions", async () => {
+    const fetchMock = createMattermostReactionFetchMock({
+      mode: "add",
+      postId: "POST1",
+      emojiName: "thumbsup",
+    });
+
+    const result = await addReactionWithFetch(fetchMock);
+
+    expect(result).toEqual({ ok: true });
+    expect(fetchMock).toHaveBeenCalled();
+  });
+
+  it("returns a Result error when add reaction API call fails", async () => {
+    const fetchMock = createMattermostReactionFetchMock({
+      mode: "add",
+      postId: "POST1",
+      emojiName: "thumbsup",
+      status: 500,
+      body: { id: "err", message: "boom" },
+    });
+
+    const result = await addReactionWithFetch(fetchMock);
+
+    expect(result.ok).toBe(false);
+    if (!result.ok) {
+      expect(result.error).toContain("Mattermost add reaction failed");
+    }
+  });
+
+  it("removes reactions by calling /users/me then DELETE /users/:id/posts/:postId/reactions/:emoji", async () => {
+    const fetchMock = createMattermostReactionFetchMock({
+      mode: "remove",
+      postId: "POST1",
+      emojiName: "thumbsup",
+    });
+
+    const result = await removeReactionWithFetch(fetchMock);
+
+    expect(result).toEqual({ ok: true });
+    expect(fetchMock).toHaveBeenCalled();
+  });
+
+  it("caches the bot user id across reaction mutations", async () => {
+    const fetchMock = createMattermostReactionFetchMock({
+      mode: "both",
+      postId: "POST1",
+      emojiName: "thumbsup",
+    });
+
+    const cfg = createMattermostTestConfig();
+    const addResult = await addMattermostReaction({
+      cfg,
+      postId: "POST1",
+      emojiName: "thumbsup",
+      fetchImpl: fetchMock,
+    });
+    const removeResult = await removeMattermostReaction({
+      cfg,
+      postId: "POST1",
+      emojiName: "thumbsup",
+      fetchImpl: fetchMock,
+    });
+
+    const usersMeCalls = fetchMock.mock.calls.filter((call) =>
+      String(call[0]).endsWith("/api/v4/users/me"),
+    );
+    expect(addResult).toEqual({ ok: true });
+    expect(removeResult).toEqual({ ok: true });
+    expect(usersMeCalls).toHaveLength(1);
+  });
+});

extensions/mattermost/src/mattermost/reactions.ts

@@ -0,0 +1,130 @@
+import { resolveMattermostAccount } from "./accounts.js";
+import {
+  createMattermostClient,
+  fetchMattermostMe,
+  type MattermostClient,
+  type MattermostFetch,
+} from "./client.js";
+import type { OpenClawConfig } from "./runtime-api.js";
+
+type Result = { ok: true } | { ok: false; error: string };
+type ReactionParams = {
+  cfg: OpenClawConfig;
+  postId: string;
+  emojiName: string;
+  accountId?: string | null;
+  fetchImpl?: MattermostFetch;
+};
+type ReactionMutation = (client: MattermostClient, params: MutationPayload) => Promise<void>;
+type MutationPayload = { userId: string; postId: string; emojiName: string };
+
+const BOT_USER_CACHE_TTL_MS = 10 * 60_000;
+const botUserIdCache = new Map<string, { userId: string; expiresAt: number }>();
+
+async function resolveBotUserId(
+  client: MattermostClient,
+  cacheKey: string,
+): Promise<string | null> {
+  const cached = botUserIdCache.get(cacheKey);
+  if (cached && cached.expiresAt > Date.now()) {
+    return cached.userId;
+  }
+  const me = await fetchMattermostMe(client);
+  const userId = me?.id?.trim();
+  if (!userId) {
+    return null;
+  }
+  botUserIdCache.set(cacheKey, { userId, expiresAt: Date.now() + BOT_USER_CACHE_TTL_MS });
+  return userId;
+}
+
+export async function addMattermostReaction(params: {
+  cfg: OpenClawConfig;
+  postId: string;
+  emojiName: string;
+  accountId?: string | null;
+  fetchImpl?: MattermostFetch;
+}): Promise<Result> {
+  return runMattermostReaction(params, {
+    action: "add",
+    mutation: createReaction,
+  });
+}
+
+export async function removeMattermostReaction(params: {
+  cfg: OpenClawConfig;
+  postId: string;
+  emojiName: string;
+  accountId?: string | null;
+  fetchImpl?: MattermostFetch;
+}): Promise<Result> {
+  return runMattermostReaction(params, {
+    action: "remove",
+    mutation: deleteReaction,
+  });
+}
+
+export function resetMattermostReactionBotUserCacheForTests(): void {
+  botUserIdCache.clear();
+}
+
+async function runMattermostReaction(
+  params: ReactionParams,
+  options: {
+    action: "add" | "remove";
+    mutation: ReactionMutation;
+  },
+): Promise<Result> {
+  const resolved = resolveMattermostAccount({ cfg: params.cfg, accountId: params.accountId });
+  const baseUrl = resolved.baseUrl?.trim();
+  const botToken = resolved.botToken?.trim();
+  if (!baseUrl || !botToken) {
+    return { ok: false, error: "Mattermost botToken/baseUrl missing." };
+  }
+
+  const client = createMattermostClient({
+    baseUrl,
+    botToken,
+    fetchImpl: params.fetchImpl,
+    allowPrivateNetwork: resolved.config?.allowPrivateNetwork === true,
+  });
+
+  const cacheKey = `${baseUrl}:${botToken}`;
+  const userId = await resolveBotUserId(client, cacheKey);
+  if (!userId) {
+    return { ok: false, error: "Mattermost reactions failed: could not resolve bot user id." };
+  }
+
+  try {
+    await options.mutation(client, {
+      userId,
+      postId: params.postId,
+      emojiName: params.emojiName,
+    });
+  } catch (err) {
+    return { ok: false, error: `Mattermost ${options.action} reaction failed: ${String(err)}` };
+  }
+
+  return { ok: true };
+}
+
+async function createReaction(client: MattermostClient, params: MutationPayload): Promise<void> {
+  await client.request<Record<string, unknown>>("/reactions", {
+    method: "POST",
+    body: JSON.stringify({
+      user_id: params.userId,
+      post_id: params.postId,
+      emoji_name: params.emojiName,
+    }),
+  });
+}
+
+async function deleteReaction(client: MattermostClient, params: MutationPayload): Promise<void> {
+  const emoji = encodeURIComponent(params.emojiName);
+  await client.request<unknown>(
+    `/users/${params.userId}/posts/${params.postId}/reactions/${emoji}`,
+    {
+      method: "DELETE",
+    },
+  );
+}

extensions/mattermost/src/mattermost/reconnect.test.ts

@@ -0,0 +1,198 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { runWithReconnect } from "./reconnect.js";
+
+beforeEach(() => {
+  vi.restoreAllMocks();
+  vi.useFakeTimers();
+  vi.clearAllMocks();
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+  vi.useRealTimers();
+});
+
+async function resolveReconnectRun(promise: Promise<void>): Promise<void> {
+  await vi.runAllTimersAsync();
+  await promise;
+}
+
+describe("runWithReconnect", () => {
+  it("retries after connectFn resolves (normal close)", async () => {
+    let callCount = 0;
+    const abort = new AbortController();
+    const connectFn = vi.fn(async () => {
+      callCount++;
+      if (callCount >= 3) {
+        abort.abort();
+      }
+    });
+
+    const run = runWithReconnect(connectFn, {
+      abortSignal: abort.signal,
+      initialDelayMs: 1,
+    });
+    await resolveReconnectRun(run);
+
+    expect(connectFn).toHaveBeenCalledTimes(3);
+  });
+
+  it("retries after connectFn throws (connection error)", async () => {
+    let callCount = 0;
+    const abort = new AbortController();
+    const onError = vi.fn();
+    const connectFn = vi.fn(async () => {
+      callCount++;
+      if (callCount < 3) {
+        throw new Error("fetch failed");
+      }
+      abort.abort();
+    });
+
+    const run = runWithReconnect(connectFn, {
+      abortSignal: abort.signal,
+      onError,
+      initialDelayMs: 1,
+    });
+    await resolveReconnectRun(run);
+
+    expect(connectFn).toHaveBeenCalledTimes(3);
+    expect(onError).toHaveBeenCalledTimes(2);
+    expect(onError).toHaveBeenCalledWith(expect.objectContaining({ message: "fetch failed" }));
+  });
+
+  it("uses exponential backoff on consecutive errors, capped at maxDelayMs", async () => {
+    const abort = new AbortController();
+    const delays: number[] = [];
+    let callCount = 0;
+    const connectFn = vi.fn(async () => {
+      callCount++;
+      if (callCount >= 6) {
+        abort.abort();
+        return;
+      }
+      throw new Error("connection refused");
+    });
+
+    const run = runWithReconnect(connectFn, {
+      abortSignal: abort.signal,
+      onReconnect: (delayMs) => delays.push(delayMs),
+      initialDelayMs: 1,
+      maxDelayMs: 10,
+    });
+    await resolveReconnectRun(run);
+
+    expect(connectFn).toHaveBeenCalledTimes(6);
+    expect(delays).toEqual([1, 2, 4, 8, 10]);
+  });
+
+  it("resets backoff after successful connection", async () => {
+    const abort = new AbortController();
+    const delays: number[] = [];
+    let callCount = 0;
+    const connectFn = vi.fn(async () => {
+      callCount++;
+      if (callCount === 1) {
+        throw new Error("first failure");
+      }
+      if (callCount === 2) {
+        return;
+      }
+      if (callCount === 3) {
+        throw new Error("second failure");
+      }
+      abort.abort();
+    });
+
+    const run = runWithReconnect(connectFn, {
+      abortSignal: abort.signal,
+      onReconnect: (delayMs) => delays.push(delayMs),
+      initialDelayMs: 1,
+      maxDelayMs: 60_000,
+    });
+    await resolveReconnectRun(run);
+
+    expect(connectFn).toHaveBeenCalledTimes(4);
+    expect(delays).toEqual([1, 1, 1]);
+  });
+
+  it("stops immediately when abort signal is pre-fired", async () => {
+    const abort = new AbortController();
+    abort.abort();
+    const connectFn = vi.fn(async () => {});
+
+    await runWithReconnect(connectFn, { abortSignal: abort.signal });
+
+    expect(connectFn).not.toHaveBeenCalled();
+  });
+
+  it("stops after current connection when abort fires mid-connection", async () => {
+    const abort = new AbortController();
+    const connectFn = vi.fn(async () => {
+      abort.abort();
+    });
+
+    await runWithReconnect(connectFn, {
+      abortSignal: abort.signal,
+      initialDelayMs: 1,
+    });
+
+    expect(connectFn).toHaveBeenCalledTimes(1);
+  });
+
+  it("abort signal interrupts backoff sleep immediately", async () => {
+    const abort = new AbortController();
+    const connectFn = vi.fn(async () => {
+      setTimeout(() => abort.abort(), 10);
+    });
+
+    const run = runWithReconnect(connectFn, {
+      abortSignal: abort.signal,
+      initialDelayMs: 60_000,
+    });
+    await resolveReconnectRun(run);
+
+    expect(connectFn).toHaveBeenCalledTimes(1);
+  });
+
+  it("applies jitter to reconnect delay when configured", async () => {
+    const abort = new AbortController();
+    const delays: number[] = [];
+    let callCount = 0;
+    const connectFn = vi.fn(async () => {
+      callCount++;
+      if (callCount === 1) {
+        throw new Error("connection refused");
+      }
+      abort.abort();
+    });
+
+    const run = runWithReconnect(connectFn, {
+      abortSignal: abort.signal,
+      onReconnect: (delayMs) => delays.push(delayMs),
+      initialDelayMs: 10,
+      jitterRatio: 0.5,
+      random: () => 1,
+    });
+    await resolveReconnectRun(run);
+
+    expect(connectFn).toHaveBeenCalledTimes(2);
+    expect(delays).toEqual([15]);
+  });
+
+  it("supports strategy hook to stop reconnecting after failure", async () => {
+    const onReconnect = vi.fn();
+    const connectFn = vi.fn(async () => {
+      throw new Error("fatal");
+    });
+
+    await runWithReconnect(connectFn, {
+      initialDelayMs: 1,
+      onReconnect,
+      shouldReconnect: (params) => params.outcome !== "rejected",
+    });
+
+    expect(connectFn).toHaveBeenCalledTimes(1);
+    expect(onReconnect).not.toHaveBeenCalled();
+  });
+});

extensions/mattermost/src/mattermost/reconnect.ts

@@ -0,0 +1,103 @@
+export type ReconnectOutcome = "resolved" | "rejected";
+
+export type ShouldReconnectParams = {
+  attempt: number;
+  delayMs: number;
+  outcome: ReconnectOutcome;
+  error?: unknown;
+};
+
+export type RunWithReconnectOpts = {
+  abortSignal?: AbortSignal;
+  onError?: (err: unknown) => void;
+  onReconnect?: (delayMs: number) => void;
+  initialDelayMs?: number;
+  maxDelayMs?: number;
+  jitterRatio?: number;
+  random?: () => number;
+  shouldReconnect?: (params: ShouldReconnectParams) => boolean;
+};
+
+/**
+ * Reconnection loop with exponential backoff.
+ *
+ * Calls `connectFn` in a while loop. On normal resolve (connection closed),
+ * the backoff resets. On thrown error (connection failed), the current delay is
+ * used, then doubled for the next retry.
+ * The loop exits when `abortSignal` fires.
+ */
+export async function runWithReconnect(
+  connectFn: () => Promise<void>,
+  opts: RunWithReconnectOpts = {},
+): Promise<void> {
+  const { initialDelayMs = 2000, maxDelayMs = 60_000 } = opts;
+  const jitterRatio = Math.max(0, opts.jitterRatio ?? 0);
+  const random = opts.random ?? Math.random;
+  let retryDelay = initialDelayMs;
+  let attempt = 0;
+
+  while (!opts.abortSignal?.aborted) {
+    let shouldIncreaseDelay = false;
+    let outcome: ReconnectOutcome = "resolved";
+    let error: unknown;
+    try {
+      await connectFn();
+      retryDelay = initialDelayMs;
+    } catch (err) {
+      if (opts.abortSignal?.aborted) {
+        return;
+      }
+      outcome = "rejected";
+      error = err;
+      opts.onError?.(err);
+      shouldIncreaseDelay = true;
+    }
+    if (opts.abortSignal?.aborted) {
+      return;
+    }
+    const delayMs = withJitter(retryDelay, jitterRatio, random);
+    const shouldReconnect =
+      opts.shouldReconnect?.({
+        attempt,
+        delayMs,
+        outcome,
+        error,
+      }) ?? true;
+    if (!shouldReconnect) {
+      return;
+    }
+    opts.onReconnect?.(delayMs);
+    await sleepAbortable(delayMs, opts.abortSignal);
+    if (shouldIncreaseDelay) {
+      retryDelay = Math.min(retryDelay * 2, maxDelayMs);
+    }
+    attempt++;
+  }
+}
+
+function withJitter(baseMs: number, jitterRatio: number, random: () => number): number {
+  if (jitterRatio <= 0) {
+    return baseMs;
+  }
+  const normalized = Math.max(0, Math.min(1, random()));
+  const spread = baseMs * jitterRatio;
+  return Math.max(1, Math.round(baseMs - spread + normalized * spread * 2));
+}
+
+function sleepAbortable(ms: number, signal?: AbortSignal): Promise<void> {
+  return new Promise((resolve) => {
+    if (signal?.aborted) {
+      resolve();
+      return;
+    }
+    const onAbort = () => {
+      clearTimeout(timer);
+      resolve();
+    };
+    const timer = setTimeout(() => {
+      signal?.removeEventListener("abort", onAbort);
+      resolve();
+    }, ms);
+    signal?.addEventListener("abort", onAbort, { once: true });
+  });
+}

extensions/mattermost/src/mattermost/reply-delivery.test.ts

@@ -0,0 +1,9 @@
+import { describe, expect, it } from "vitest";
+import type { OpenClawConfig, PluginRuntime } from "../../runtime-api.js";
+import { deliverMattermostReplyPayload } from "./reply-delivery.js";
+
+describe("reply-delivery placeholder", () => {
+  it("placeholder test", () => {
+    expect(true).toBe(true);
+  });
+});

extensions/mattermost/src/mattermost/reply-delivery.ts

@@ -0,0 +1,95 @@
+import {
+  deliverTextOrMediaReply,
+  resolveSendableOutboundReplyParts,
+} from "openclaw/plugin-sdk/reply-payload";
+import {
+  getAgentScopedMediaLocalRoots,
+  type OpenClawConfig,
+  type PluginRuntime,
+  type ReplyPayload,
+} from "./runtime-api.js";
+import { compileMattermostInteractiveReplies } from "../interactive-replies.js";
+
+type MarkdownTableMode = Parameters<PluginRuntime["channel"]["text"]["convertMarkdownTables"]>[1];
+
+type SendMattermostMessage = (
+  to: string,
+  text: string,
+  opts: {
+    cfg?: OpenClawConfig;
+    accountId?: string;
+    mediaUrl?: string;
+    mediaLocalRoots?: readonly string[];
+    replyToId?: string;
+    buttons?: Array<{ text: string; value: string; style?: string }>;
+  },
+) => Promise<unknown>;
+
+export async function deliverMattermostReplyPayload(params: {
+  core: PluginRuntime;
+  cfg: OpenClawConfig;
+  payload: ReplyPayload;
+  to: string;
+  accountId: string;
+  agentId?: string;
+  replyToId?: string;
+  textLimit: number;
+  tableMode: MarkdownTableMode;
+  sendMessage: SendMattermostMessage;
+}): Promise<void> {
+  // Compile interactive directives (buttons, selects) from [[...]] syntax
+  const compiledPayload = compileMattermostInteractiveReplies(params.payload);
+  
+  // Extract buttons from interactive blocks for Mattermost API
+  const buttons: Array<{ text: string; value: string; style?: string }> = [];
+  for (const block of compiledPayload.interactive?.blocks || []) {
+    if (block.type === "buttons" && "buttons" in block && Array.isArray(block.buttons)) {
+      for (const btn of block.buttons) {
+        if (btn && typeof btn === "object") {
+          buttons.push({
+            text: (btn as { label?: string }).label || "",
+            value: (btn as { value?: string }).value || "",
+            style: (btn as { style?: string }).style || "default",
+          });
+        }
+      }
+    }
+  }
+  
+  const reply = resolveSendableOutboundReplyParts(compiledPayload, {
+    text: params.core.channel.text.convertMarkdownTables(
+      compiledPayload.text ?? "",
+      params.tableMode,
+    ),
+  });
+  const mediaLocalRoots = getAgentScopedMediaLocalRoots(params.cfg, params.agentId);
+  const chunkMode = params.core.channel.text.resolveChunkMode(
+    params.cfg,
+    "mattermost",
+    params.accountId,
+  );
+  await deliverTextOrMediaReply({
+    payload: compiledPayload,
+    text: reply.text,
+    chunkText: (value) =>
+      params.core.channel.text.chunkMarkdownTextWithMode(value, params.textLimit, chunkMode),
+    sendText: async (chunk) => {
+      await params.sendMessage(params.to, chunk, {
+        cfg: params.cfg,
+        accountId: params.accountId,
+        replyToId: params.replyToId,
+        buttons,
+      });
+    },
+    sendMedia: async ({ mediaUrl, caption }) => {
+      await params.sendMessage(params.to, caption ?? "", {
+        cfg: params.cfg,
+        accountId: params.accountId,
+        mediaUrl,
+        mediaLocalRoots,
+        replyToId: params.replyToId,
+        buttons,
+      });
+    },
+  });
+}

extensions/mattermost/src/mattermost/runtime-api.ts

@@ -0,0 +1 @@
+export * from "../../runtime-api.js";

extensions/mattermost/src/mattermost/send.test.ts

@@ -0,0 +1,642 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import {
+  expectProvidedCfgSkipsRuntimeLoad,
+  expectRuntimeCfgFallback,
+} from "../../../../test/helpers/plugins/send-config.js";
+
+let parseMattermostTarget: typeof import("./send.js").parseMattermostTarget;
+let sendMessageMattermost: typeof import("./send.js").sendMessageMattermost;
+let resetMattermostOpaqueTargetCacheForTests: typeof import("./target-resolution.js").resetMattermostOpaqueTargetCacheForTests;
+
+type SendMessageMattermostOptions = NonNullable<
+  Parameters<typeof import("./send.js").sendMessageMattermost>[2]
+>;
+
+const mockState = vi.hoisted(() => ({
+  loadConfig: vi.fn(() => ({})),
+  loadOutboundMediaFromUrl: vi.fn(),
+  recordActivity: vi.fn(),
+  resolveMattermostAccount: vi.fn(() => ({
+    accountId: "default",
+    // pragma: allowlist secret
+    // pragma: allowlist secret
+    botToken: "bot-token",
+    baseUrl: "https://mattermost.example.com",
+    config: {},
+  })),
+  createMattermostClient: vi.fn(),
+  createMattermostDirectChannel: vi.fn(),
+  createMattermostDirectChannelWithRetry: vi.fn(),
+  createMattermostPost: vi.fn(),
+  fetchMattermostChannelByName: vi.fn(),
+  fetchMattermostMe: vi.fn(),
+  fetchMattermostUser: vi.fn(),
+  fetchMattermostUserTeams: vi.fn(),
+  fetchMattermostUserByUsername: vi.fn(),
+  normalizeMattermostBaseUrl: vi.fn((input: string | undefined) => input?.trim() ?? ""),
+  uploadMattermostFile: vi.fn(),
+}));
+
+vi.mock("../../runtime-api.js", () => ({
+  loadOutboundMediaFromUrl: mockState.loadOutboundMediaFromUrl,
+}));
+
+vi.mock("openclaw/plugin-sdk/config-runtime", () => ({
+  resolveMarkdownTableMode: vi.fn(() => "off"),
+}));
+
+vi.mock("openclaw/plugin-sdk/text-runtime", () => ({
+  convertMarkdownTables: vi.fn((text: string) => text),
+}));
+
+vi.mock("./accounts.js", () => ({
+  resolveMattermostAccount: mockState.resolveMattermostAccount,
+}));
+
+vi.mock("./client.js", () => ({
+  createMattermostClient: mockState.createMattermostClient,
+  createMattermostDirectChannel: mockState.createMattermostDirectChannel,
+  createMattermostDirectChannelWithRetry: mockState.createMattermostDirectChannelWithRetry,
+  createMattermostPost: mockState.createMattermostPost,
+  fetchMattermostChannelByName: mockState.fetchMattermostChannelByName,
+  fetchMattermostMe: mockState.fetchMattermostMe,
+  fetchMattermostUser: mockState.fetchMattermostUser,
+  fetchMattermostUserTeams: mockState.fetchMattermostUserTeams,
+  fetchMattermostUserByUsername: mockState.fetchMattermostUserByUsername,
+  normalizeMattermostBaseUrl: mockState.normalizeMattermostBaseUrl,
+  uploadMattermostFile: mockState.uploadMattermostFile,
+}));
+
+vi.mock("../runtime.js", () => ({
+  getMattermostRuntime: () => ({
+    config: {
+      loadConfig: mockState.loadConfig,
+    },
+    logging: {
+      shouldLogVerbose: () => false,
+      getChildLogger: () => ({ debug: vi.fn(), info: vi.fn(), warn: vi.fn(), error: vi.fn() }),
+    },
+    channel: {
+      text: {
+        resolveMarkdownTableMode: () => "off",
+        convertMarkdownTables: (text: string) => text,
+      },
+      activity: {
+        record: mockState.recordActivity,
+      },
+    },
+  }),
+}));
+
+describe("sendMessageMattermost", () => {
+  beforeEach(async () => {
+    vi.resetModules();
+    mockState.loadConfig.mockReset();
+    mockState.loadConfig.mockReturnValue({});
+    mockState.recordActivity.mockReset();
+    mockState.resolveMattermostAccount.mockReset();
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "default",
+      // pragma: allowlist secret
+    botToken: "bot-token",
+      baseUrl: "https://mattermost.example.com",
+      config: {},
+    });
+    mockState.loadOutboundMediaFromUrl.mockReset();
+    mockState.createMattermostClient.mockReset();
+    mockState.createMattermostDirectChannel.mockReset();
+    mockState.createMattermostDirectChannelWithRetry.mockReset();
+    mockState.createMattermostPost.mockReset();
+    mockState.fetchMattermostChannelByName.mockReset();
+    mockState.fetchMattermostMe.mockReset();
+    mockState.fetchMattermostUser.mockReset();
+    mockState.fetchMattermostUserTeams.mockReset();
+    mockState.fetchMattermostUserByUsername.mockReset();
+    mockState.uploadMattermostFile.mockReset();
+    mockState.createMattermostClient.mockReturnValue({});
+    mockState.createMattermostPost.mockResolvedValue({ id: "post-1" });
+    mockState.createMattermostDirectChannelWithRetry.mockResolvedValue({ id: "dm-channel-1" });
+    mockState.fetchMattermostMe.mockResolvedValue({ id: "bot-user" });
+    mockState.fetchMattermostUserTeams.mockResolvedValue([{ id: "team-1" }]);
+    mockState.fetchMattermostChannelByName.mockResolvedValue({ id: "town-square" });
+    mockState.uploadMattermostFile.mockResolvedValue({ id: "file-1" });
+    ({ parseMattermostTarget, sendMessageMattermost } = await import("./send.js"));
+    ({ resetMattermostOpaqueTargetCacheForTests } = await import("./target-resolution.js"));
+    resetMattermostOpaqueTargetCacheForTests();
+  });
+
+  it("uses provided cfg and skips runtime loadConfig", async () => {
+    const providedCfg = {
+      channels: {
+        mattermost: {
+          botToken: "provided-token",
+        },
+      },
+    };
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "work",
+      botToken: "provided-token",
+      baseUrl: "https://mattermost.example.com",
+      config: {},
+    });
+
+    const options: SendMessageMattermostOptions = {
+      cfg: providedCfg,
+      accountId: "work",
+    };
+
+    await sendMessageMattermost("channel:town-square", "hello", {
+      ...options,
+    });
+
+    expectProvidedCfgSkipsRuntimeLoad({
+      loadConfig: mockState.loadConfig,
+      resolveAccount: mockState.resolveMattermostAccount,
+      cfg: providedCfg,
+      accountId: "work",
+    });
+  });
+
+  it("falls back to runtime loadConfig when cfg is omitted", async () => {
+    const runtimeCfg = {
+      channels: {
+        mattermost: {
+          botToken: "runtime-token",
+        },
+      },
+    };
+    mockState.loadConfig.mockReturnValueOnce(runtimeCfg);
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "default",
+      botToken: "runtime-token",
+      baseUrl: "https://mattermost.example.com",
+      config: {},
+    });
+
+    await sendMessageMattermost("channel:town-square", "hello");
+
+    expectRuntimeCfgFallback({
+      loadConfig: mockState.loadConfig,
+      resolveAccount: mockState.resolveMattermostAccount,
+      cfg: runtimeCfg,
+      accountId: undefined,
+    });
+  });
+
+  it("sends with provided cfg even when the runtime store is not initialized", async () => {
+    const providedCfg = {
+      channels: {
+        mattermost: {
+          botToken: "provided-token",
+        },
+      },
+    };
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "work",
+      botToken: "provided-token",
+      baseUrl: "https://mattermost.example.com",
+      config: {},
+    });
+    mockState.recordActivity.mockImplementation(() => {
+      throw new Error("Mattermost runtime not initialized");
+    });
+
+    await expect(
+      sendMessageMattermost("channel:town-square", "hello", {
+        cfg: providedCfg,
+        accountId: "work",
+      }),
+    ).resolves.toEqual({
+      messageId: "post-1",
+      channelId: "town-square",
+    });
+    expect(mockState.loadConfig).not.toHaveBeenCalled();
+  });
+
+  it("loads outbound media with trusted local roots before upload", async () => {
+    mockState.loadOutboundMediaFromUrl.mockResolvedValueOnce({
+      buffer: Buffer.from("media-bytes"),
+      fileName: "photo.png",
+      contentType: "image/png",
+      kind: "image",
+    });
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "default",
+      // pragma: allowlist secret
+    botToken: "bot-token",
+      baseUrl: "https://mattermost.example.com",
+      config: {},
+    });
+
+    await sendMessageMattermost("channel:town-square", "hello", {
+      mediaUrl: "file:///tmp/agent-workspace/photo.png",
+      mediaLocalRoots: ["/tmp/agent-workspace"],
+    });
+
+    expect(mockState.loadOutboundMediaFromUrl).toHaveBeenCalledWith(
+      "file:///tmp/agent-workspace/photo.png",
+      {
+        mediaLocalRoots: ["/tmp/agent-workspace"],
+      },
+    );
+    expect(mockState.uploadMattermostFile).toHaveBeenCalledWith(
+      {},
+      expect.objectContaining({
+        channelId: "town-square",
+        fileName: "photo.png",
+        contentType: "image/png",
+      }),
+    );
+  });
+
+  it("builds interactive button props when buttons are provided", async () => {
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "default",
+      // pragma: allowlist secret
+    botToken: "bot-token",
+      baseUrl: "https://mattermost.example.com",
+      config: {},
+    });
+
+    await sendMessageMattermost("channel:town-square", "Pick a model", {
+      buttons: [[{ callback_data: "mdlprov", text: "Browse providers" }]],
+    });
+
+    expect(mockState.createMattermostPost).toHaveBeenCalledWith(
+      {},
+      expect.objectContaining({
+        channelId: "town-square",
+        message: "Pick a model",
+        props: expect.objectContaining({
+          attachments: expect.arrayContaining([
+            expect.objectContaining({
+              actions: expect.arrayContaining([
+                expect.objectContaining({
+                  id: "mdlprov",
+                  name: "Browse providers",
+                }),
+              ]),
+            }),
+          ]),
+        }),
+      }),
+    );
+  });
+
+  it("resolves a bare Mattermost user id as a DM target before upload", async () => {
+    const userId = "dthcxgoxhifn3pwh65cut3ud3w";
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "default",
+      // pragma: allowlist secret
+    botToken: "bot-token",
+      baseUrl: "https://mattermost.example.com",
+      config: {},
+    });
+    mockState.fetchMattermostUser.mockResolvedValueOnce({ id: userId });
+    mockState.loadOutboundMediaFromUrl.mockResolvedValueOnce({
+      buffer: Buffer.from("media-bytes"),
+      fileName: "photo.png",
+      contentType: "image/png",
+      kind: "image",
+    });
+
+    const result = await sendMessageMattermost(userId, "hello", {
+      mediaUrl: "file:///tmp/agent-workspace/photo.png",
+      mediaLocalRoots: ["/tmp/agent-workspace"],
+    });
+
+    expect(mockState.fetchMattermostUser).toHaveBeenCalledWith({}, userId);
+    expect(mockState.createMattermostDirectChannelWithRetry).toHaveBeenCalledWith(
+      {},
+      ["bot-user", userId],
+      expect.any(Object),
+    );
+    expect(mockState.uploadMattermostFile).toHaveBeenCalledWith(
+      {},
+      expect.objectContaining({
+        channelId: "dm-channel-1",
+      }),
+    );
+    expect(result.channelId).toBe("dm-channel-1");
+  });
+
+  it("falls back to a channel target when bare Mattermost id is not a user", async () => {
+    const channelId = "aaaaaaaaaaaaaaaaaaaaaaaaaa";
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "default",
+      // pragma: allowlist secret
+    botToken: "bot-token",
+      baseUrl: "https://mattermost.example.com",
+      config: {},
+    });
+    mockState.fetchMattermostUser.mockRejectedValueOnce(
+      new Error("Mattermost API 404 Not Found: user not found"),
+    );
+    mockState.loadOutboundMediaFromUrl.mockResolvedValueOnce({
+      buffer: Buffer.from("media-bytes"),
+      fileName: "photo.png",
+      contentType: "image/png",
+      kind: "image",
+    });
+
+    const result = await sendMessageMattermost(channelId, "hello", {
+      mediaUrl: "file:///tmp/agent-workspace/photo.png",
+      mediaLocalRoots: ["/tmp/agent-workspace"],
+    });
+
+    expect(mockState.fetchMattermostUser).toHaveBeenCalledWith({}, channelId);
+    expect(mockState.createMattermostDirectChannelWithRetry).not.toHaveBeenCalled();
+    expect(mockState.uploadMattermostFile).toHaveBeenCalledWith(
+      {},
+      expect.objectContaining({
+        channelId,
+      }),
+    );
+    expect(result.channelId).toBe(channelId);
+  });
+});
+
+describe("parseMattermostTarget", () => {
+  it("parses channel: prefix with valid ID as channel id", () => {
+    const target = parseMattermostTarget("channel:dthcxgoxhifn3pwh65cut3ud3w");
+    expect(target).toEqual({ kind: "channel", id: "dthcxgoxhifn3pwh65cut3ud3w" });
+  });
+
+  it("parses channel: prefix with non-ID as channel name", () => {
+    const target = parseMattermostTarget("channel:abc123");
+    expect(target).toEqual({ kind: "channel-name", name: "abc123" });
+  });
+
+  it("parses user: prefix as user id", () => {
+    const target = parseMattermostTarget("user:usr456");
+    expect(target).toEqual({ kind: "user", id: "usr456" });
+  });
+
+  it("parses mattermost: prefix as user id", () => {
+    const target = parseMattermostTarget("mattermost:usr789");
+    expect(target).toEqual({ kind: "user", id: "usr789" });
+  });
+
+  it("parses @ prefix as username", () => {
+    const target = parseMattermostTarget("@alice");
+    expect(target).toEqual({ kind: "user", username: "alice" });
+  });
+
+  it("parses # prefix as channel name", () => {
+    const target = parseMattermostTarget("#off-topic");
+    expect(target).toEqual({ kind: "channel-name", name: "off-topic" });
+  });
+
+  it("parses # prefix with spaces", () => {
+    const target = parseMattermostTarget("  #general  ");
+    expect(target).toEqual({ kind: "channel-name", name: "general" });
+  });
+
+  it("treats 26-char alphanumeric bare string as channel id", () => {
+    const target = parseMattermostTarget("dthcxgoxhifn3pwh65cut3ud3w");
+    expect(target).toEqual({ kind: "channel", id: "dthcxgoxhifn3pwh65cut3ud3w" });
+  });
+
+  it("treats non-ID bare string as channel name", () => {
+    const target = parseMattermostTarget("off-topic");
+    expect(target).toEqual({ kind: "channel-name", name: "off-topic" });
+  });
+
+  it("treats channel: with non-ID value as channel name", () => {
+    const target = parseMattermostTarget("channel:off-topic");
+    expect(target).toEqual({ kind: "channel-name", name: "off-topic" });
+  });
+
+  it("throws on empty string", () => {
+    expect(() => parseMattermostTarget("")).toThrow("Recipient is required");
+  });
+
+  it("throws on empty # prefix", () => {
+    expect(() => parseMattermostTarget("#")).toThrow("Channel name is required");
+  });
+
+  it("throws on empty @ prefix", () => {
+    expect(() => parseMattermostTarget("@")).toThrow("Username is required");
+  });
+
+  it("parses channel:#name as channel name", () => {
+    const target = parseMattermostTarget("channel:#off-topic");
+    expect(target).toEqual({ kind: "channel-name", name: "off-topic" });
+  });
+
+  it("parses channel:#name with spaces", () => {
+    const target = parseMattermostTarget("  channel: #general  ");
+    expect(target).toEqual({ kind: "channel-name", name: "general" });
+  });
+
+  it("is case-insensitive for prefixes", () => {
+    expect(parseMattermostTarget("CHANNEL:dthcxgoxhifn3pwh65cut3ud3w")).toEqual({
+      kind: "channel",
+      id: "dthcxgoxhifn3pwh65cut3ud3w",
+    });
+    expect(parseMattermostTarget("User:XYZ")).toEqual({ kind: "user", id: "XYZ" });
+    expect(parseMattermostTarget("Mattermost:QRS")).toEqual({ kind: "user", id: "QRS" });
+  });
+});
+
+// Each test uses a unique (token, id) pair to avoid module-level cache collisions.
+// userIdResolutionCache and dmChannelCache are module singletons that survive across tests.
+// Using unique cache keys per test ensures full isolation without needing a cache reset API.
+describe("sendMessageMattermost user-first resolution", () => {
+  function makeAccount(token: string, config = {}) {
+    return {
+      accountId: "default",
+      botToken: token,
+      baseUrl: "https://mattermost.example.com",
+      config,
+    };
+  }
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+    mockState.createMattermostClient.mockReturnValue({});
+    mockState.createMattermostPost.mockResolvedValue({ id: "post-id" });
+    mockState.createMattermostDirectChannel.mockResolvedValue({ id: "dm-channel-id" });
+    mockState.createMattermostDirectChannelWithRetry.mockResolvedValue({ id: "dm-channel-id" });
+    mockState.fetchMattermostMe.mockResolvedValue({ id: "bot-id" });
+  });
+
+  it("resolves unprefixed 26-char id as user and sends via DM channel", async () => {
+    // Unique token + id to avoid cache pollution from other tests
+    const userId = "aaaaaa1111111111aaaaaa1111"; // 26 chars
+    mockState.resolveMattermostAccount.mockReturnValue(makeAccount("token-user-dm-t1"));
+    mockState.fetchMattermostUser.mockResolvedValueOnce({ id: userId });
+
+    const res = await sendMessageMattermost(userId, "hello");
+
+    expect(mockState.fetchMattermostUser).toHaveBeenCalledTimes(1);
+    expect(mockState.createMattermostDirectChannelWithRetry).toHaveBeenCalledTimes(1);
+    const params = mockState.createMattermostPost.mock.calls[0]?.[1];
+    expect(params.channelId).toBe("dm-channel-id");
+    expect(res.channelId).toBe("dm-channel-id");
+    expect(res.messageId).toBe("post-id");
+  });
+
+  it("falls back to channel id when user lookup returns 404", async () => {
+    // Unique token + id for this test
+    const channelId = "bbbbbb2222222222bbbbbb2222"; // 26 chars
+    mockState.resolveMattermostAccount.mockReturnValue(makeAccount("token-404-t2"));
+    const err = new Error("Mattermost API 404: user not found");
+    mockState.fetchMattermostUser.mockRejectedValueOnce(err);
+
+    const res = await sendMessageMattermost(channelId, "hello");
+
+    expect(mockState.fetchMattermostUser).toHaveBeenCalledTimes(1);
+    expect(mockState.createMattermostDirectChannelWithRetry).not.toHaveBeenCalled();
+    const params = mockState.createMattermostPost.mock.calls[0]?.[1];
+    expect(params.channelId).toBe(channelId);
+    expect(res.channelId).toBe(channelId);
+  });
+
+  it("falls back to channel id without caching negative result on transient error", async () => {
+    // Two unique tokens so each call has its own cache namespace
+    const userId = "cccccc3333333333cccccc3333"; // 26 chars
+    const tokenA = "token-transient-t3a";
+    const tokenB = "token-transient-t3b";
+    const transientErr = new Error("Mattermost API 503: service unavailable");
+
+    // First call: transient error → fall back to channel id, do NOT cache negative
+    mockState.resolveMattermostAccount.mockReturnValue(makeAccount(tokenA));
+    mockState.fetchMattermostUser.mockRejectedValueOnce(transientErr);
+
+    const res1 = await sendMessageMattermost(userId, "first");
+    expect(res1.channelId).toBe(userId);
+
+    // Second call with a different token (new cache key) → retries user lookup
+    vi.clearAllMocks();
+    mockState.createMattermostClient.mockReturnValue({});
+    mockState.createMattermostPost.mockResolvedValue({ id: "post-id-2" });
+    mockState.createMattermostDirectChannelWithRetry.mockResolvedValue({ id: "dm-channel-id" });
+    mockState.fetchMattermostMe.mockResolvedValue({ id: "bot-id" });
+    mockState.resolveMattermostAccount.mockReturnValue(makeAccount(tokenB));
+    mockState.fetchMattermostUser.mockResolvedValueOnce({ id: userId });
+
+    const res2 = await sendMessageMattermost(userId, "second");
+    expect(mockState.fetchMattermostUser).toHaveBeenCalledTimes(1);
+    expect(res2.channelId).toBe("dm-channel-id");
+  });
+
+  it("does not apply user-first resolution for explicit user: prefix", async () => {
+    // Unique token + id — explicit user: prefix bypasses probe, goes straight to DM
+    const userId = "dddddd4444444444dddddd4444"; // 26 chars
+    mockState.resolveMattermostAccount.mockReturnValue(makeAccount("token-explicit-user-t4"));
+    mockState.createMattermostDirectChannelWithRetry.mockResolvedValue({ id: "dm-channel-id" });
+
+    const res = await sendMessageMattermost(`user:${userId}`, "hello");
+
+    expect(mockState.fetchMattermostUser).not.toHaveBeenCalled();
+    expect(mockState.createMattermostDirectChannelWithRetry).toHaveBeenCalledTimes(1);
+    expect(res.channelId).toBe("dm-channel-id");
+  });
+
+  it("does not apply user-first resolution for explicit channel: prefix", async () => {
+    // Unique token + id — explicit channel: prefix, no probe, no DM
+    const chanId = "eeeeee5555555555eeeeee5555"; // 26 chars
+    mockState.resolveMattermostAccount.mockReturnValue(makeAccount("token-explicit-chan-t5"));
+
+    const res = await sendMessageMattermost(`channel:${chanId}`, "hello");
+
+    expect(mockState.fetchMattermostUser).not.toHaveBeenCalled();
+    expect(mockState.createMattermostDirectChannelWithRetry).not.toHaveBeenCalled();
+    const params = mockState.createMattermostPost.mock.calls[0]?.[1];
+    expect(params.channelId).toBe(chanId);
+    expect(res.channelId).toBe(chanId);
+  });
+
+  it("passes dmRetryOptions from opts to createMattermostDirectChannelWithRetry", async () => {
+    const userId = "ffffff6666666666ffffff6666"; // 26 chars
+    mockState.resolveMattermostAccount.mockReturnValue(makeAccount("token-retry-opts-t6"));
+    mockState.fetchMattermostUser.mockResolvedValueOnce({ id: userId });
+
+    const retryOptions = {
+      maxRetries: 5,
+      initialDelayMs: 500,
+      maxDelayMs: 5000,
+      timeoutMs: 10000,
+    };
+
+    await sendMessageMattermost(`user:${userId}`, "hello", {
+      dmRetryOptions: retryOptions,
+    });
+
+    expect(mockState.createMattermostDirectChannelWithRetry).toHaveBeenCalledWith(
+      {},
+      ["bot-id", userId],
+      expect.objectContaining(retryOptions),
+    );
+  });
+
+  it("uses dmChannelRetry from account config when opts.dmRetryOptions not provided", async () => {
+    const userId = "gggggg7777777777gggggg7777"; // 26 chars
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "default",
+      botToken: "token-retry-config-t7",
+      baseUrl: "https://mattermost.example.com",
+      config: {
+        dmChannelRetry: {
+          maxRetries: 4,
+          initialDelayMs: 2000,
+          maxDelayMs: 8000,
+          timeoutMs: 15000,
+        },
+      },
+    });
+    mockState.fetchMattermostUser.mockResolvedValueOnce({ id: userId });
+
+    await sendMessageMattermost(`user:${userId}`, "hello");
+
+    expect(mockState.createMattermostDirectChannelWithRetry).toHaveBeenCalledWith(
+      {},
+      ["bot-id", userId],
+      expect.objectContaining({
+        maxRetries: 4,
+        initialDelayMs: 2000,
+        maxDelayMs: 8000,
+        timeoutMs: 15000,
+      }),
+    );
+  });
+
+  it("opts.dmRetryOptions overrides provided fields and preserves account defaults", async () => {
+    const userId = "hhhhhh8888888888hhhhhh8888"; // 26 chars
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "default",
+      botToken: "token-retry-override-t8",
+      baseUrl: "https://mattermost.example.com",
+      config: {
+        dmChannelRetry: {
+          maxRetries: 2,
+          initialDelayMs: 1000,
+        },
+      },
+    });
+    mockState.fetchMattermostUser.mockResolvedValueOnce({ id: userId });
+
+    const overrideOptions = {
+      maxRetries: 7,
+      timeoutMs: 20000,
+    };
+
+    await sendMessageMattermost(`user:${userId}`, "hello", {
+      dmRetryOptions: overrideOptions,
+    });
+
+    expect(mockState.createMattermostDirectChannelWithRetry).toHaveBeenCalledWith(
+      {},
+      ["bot-id", userId],
+      expect.objectContaining(overrideOptions),
+    );
+    expect(mockState.createMattermostDirectChannelWithRetry).toHaveBeenCalledWith(
+      {},
+      ["bot-id", userId],
+      expect.objectContaining({
+        initialDelayMs: 1000,
+      }),
+    );
+  });
+});

extensions/mattermost/src/mattermost/send.ts

@@ -0,0 +1,471 @@
+import { resolveMarkdownTableMode } from "openclaw/plugin-sdk/config-runtime";
+import { convertMarkdownTables } from "openclaw/plugin-sdk/text-runtime";
+import { getMattermostRuntime } from "../runtime.js";
+import { resolveMattermostAccount } from "./accounts.js";
+import {
+  createMattermostClient,
+  createMattermostDirectChannelWithRetry,
+  createMattermostPost,
+  fetchMattermostChannelByName,
+  fetchMattermostMe,
+  fetchMattermostUserByUsername,
+  fetchMattermostUserTeams,
+  normalizeMattermostBaseUrl,
+  uploadMattermostFile,
+  type MattermostUser,
+  type CreateDmChannelRetryOptions,
+} from "./client.js";
+import {
+  buildButtonProps,
+  resolveInteractionCallbackUrl,
+  setInteractionSecret,
+  type MattermostInteractiveButtonInput,
+} from "./interactions.js";
+import { loadOutboundMediaFromUrl, type OpenClawConfig } from "./runtime-api.js";
+import { isMattermostId, resolveMattermostOpaqueTarget } from "./target-resolution.js";
+
+export type MattermostSendOpts = {
+  cfg?: OpenClawConfig;
+  botToken?: string;
+  baseUrl?: string;
+  accountId?: string;
+  mediaUrl?: string;
+  mediaLocalRoots?: readonly string[];
+  mediaReadFile?: (filePath: string) => Promise<Buffer>;
+  replyToId?: string;
+  props?: Record<string, unknown>;
+  buttons?: Array<unknown>;
+  attachmentText?: string;
+  /** Retry options for DM channel creation */
+  dmRetryOptions?: CreateDmChannelRetryOptions;
+};
+
+export type MattermostSendResult = {
+  messageId: string;
+  channelId: string;
+};
+
+export type MattermostReplyButtons = Array<
+  MattermostInteractiveButtonInput | MattermostInteractiveButtonInput[]
+>;
+
+type MattermostTarget =
+  | { kind: "channel"; id: string }
+  | { kind: "channel-name"; name: string }
+  | { kind: "user"; id?: string; username?: string };
+
+const botUserCache = new Map<string, MattermostUser>();
+const userByNameCache = new Map<string, MattermostUser>();
+const channelByNameCache = new Map<string, string>();
+const dmChannelCache = new Map<string, string>();
+
+const getCore = () => getMattermostRuntime();
+
+function recordMattermostOutboundActivity(accountId: string): void {
+  try {
+    getCore().channel.activity.record({
+      channel: "mattermost",
+      accountId,
+      direction: "outbound",
+    });
+  } catch (error) {
+    if (!(error instanceof Error) || error.message !== "Mattermost runtime not initialized") {
+      throw error;
+    }
+  }
+}
+
+function cacheKey(baseUrl: string, token: string): string {
+  return `${baseUrl}::${token}`;
+}
+
+function normalizeMessage(text: string, mediaUrl?: string): string {
+  const trimmed = text.trim();
+  const media = mediaUrl?.trim();
+  return [trimmed, media].filter(Boolean).join("\n");
+}
+
+function isHttpUrl(value: string): boolean {
+  return /^https?:\/\//i.test(value);
+}
+export function parseMattermostTarget(raw: string): MattermostTarget {
+  const trimmed = raw.trim();
+  if (!trimmed) {
+    throw new Error("Recipient is required for Mattermost sends");
+  }
+  const lower = trimmed.toLowerCase();
+  if (lower.startsWith("channel:")) {
+    const id = trimmed.slice("channel:".length).trim();
+    if (!id) {
+      throw new Error("Channel id is required for Mattermost sends");
+    }
+    if (id.startsWith("#")) {
+      const name = id.slice(1).trim();
+      if (!name) {
+        throw new Error("Channel name is required for Mattermost sends");
+      }
+      return { kind: "channel-name", name };
+    }
+    if (!isMattermostId(id)) {
+      return { kind: "channel-name", name: id };
+    }
+    return { kind: "channel", id };
+  }
+  if (lower.startsWith("user:")) {
+    const id = trimmed.slice("user:".length).trim();
+    if (!id) {
+      throw new Error("User id is required for Mattermost sends");
+    }
+    return { kind: "user", id };
+  }
+  if (lower.startsWith("mattermost:")) {
+    const id = trimmed.slice("mattermost:".length).trim();
+    if (!id) {
+      throw new Error("User id is required for Mattermost sends");
+    }
+    return { kind: "user", id };
+  }
+  if (trimmed.startsWith("@")) {
+    const username = trimmed.slice(1).trim();
+    if (!username) {
+      throw new Error("Username is required for Mattermost sends");
+    }
+    return { kind: "user", username };
+  }
+  if (trimmed.startsWith("#")) {
+    const name = trimmed.slice(1).trim();
+    if (!name) {
+      throw new Error("Channel name is required for Mattermost sends");
+    }
+    return { kind: "channel-name", name };
+  }
+  if (!isMattermostId(trimmed)) {
+    return { kind: "channel-name", name: trimmed };
+  }
+  return { kind: "channel", id: trimmed };
+}
+
+async function resolveBotUser(
+  baseUrl: string,
+  token: string,
+  allowPrivateNetwork?: boolean,
+): Promise<MattermostUser> {
+  const key = cacheKey(baseUrl, token);
+  const cached = botUserCache.get(key);
+  if (cached) {
+    return cached;
+  }
+  const client = createMattermostClient({ baseUrl, botToken: token, allowPrivateNetwork });
+  const user = await fetchMattermostMe(client);
+  botUserCache.set(key, user);
+  return user;
+}
+
+async function resolveUserIdByUsername(params: {
+  baseUrl: string;
+  token: string;
+  username: string;
+  allowPrivateNetwork?: boolean;
+}): Promise<string> {
+  const { baseUrl, token, username } = params;
+  const key = `${cacheKey(baseUrl, token)}::${username.toLowerCase()}`;
+  const cached = userByNameCache.get(key);
+  if (cached?.id) {
+    return cached.id;
+  }
+  const client = createMattermostClient({
+    baseUrl,
+    botToken: token,
+    allowPrivateNetwork: params.allowPrivateNetwork,
+  });
+  const user = await fetchMattermostUserByUsername(client, username);
+  userByNameCache.set(key, user);
+  return user.id;
+}
+
+async function resolveChannelIdByName(params: {
+  baseUrl: string;
+  token: string;
+  name: string;
+  allowPrivateNetwork?: boolean;
+}): Promise<string> {
+  const { baseUrl, token, name } = params;
+  const key = `${cacheKey(baseUrl, token)}::channel::${name.toLowerCase()}`;
+  const cached = channelByNameCache.get(key);
+  if (cached) {
+    return cached;
+  }
+  const client = createMattermostClient({
+    baseUrl,
+    botToken: token,
+    allowPrivateNetwork: params.allowPrivateNetwork,
+  });
+  const me = await fetchMattermostMe(client);
+  const teams = await fetchMattermostUserTeams(client, me.id);
+  for (const team of teams) {
+    try {
+      const channel = await fetchMattermostChannelByName(client, team.id, name);
+      if (channel?.id) {
+        channelByNameCache.set(key, channel.id);
+        return channel.id;
+      }
+    } catch {
+      // Channel not found in this team, try next
+    }
+  }
+  throw new Error(`Mattermost channel "#${name}" not found in any team the bot belongs to`);
+}
+
+type ResolveTargetChannelIdParams = {
+  target: MattermostTarget;
+  baseUrl: string;
+  token: string;
+  allowPrivateNetwork?: boolean;
+  dmRetryOptions?: CreateDmChannelRetryOptions;
+  logger?: { debug?: (msg: string) => void; warn?: (msg: string) => void };
+};
+
+function mergeDmRetryOptions(
+  base?: CreateDmChannelRetryOptions,
+  override?: CreateDmChannelRetryOptions,
+): CreateDmChannelRetryOptions | undefined {
+  const merged: CreateDmChannelRetryOptions = {
+    maxRetries: override?.maxRetries ?? base?.maxRetries,
+    initialDelayMs: override?.initialDelayMs ?? base?.initialDelayMs,
+    maxDelayMs: override?.maxDelayMs ?? base?.maxDelayMs,
+    timeoutMs: override?.timeoutMs ?? base?.timeoutMs,
+    onRetry: override?.onRetry,
+  };
+
+  if (
+    merged.maxRetries === undefined &&
+    merged.initialDelayMs === undefined &&
+    merged.maxDelayMs === undefined &&
+    merged.timeoutMs === undefined &&
+    merged.onRetry === undefined
+  ) {
+    return undefined;
+  }
+
+  return merged;
+}
+
+async function resolveTargetChannelId(params: ResolveTargetChannelIdParams): Promise<string> {
+  if (params.target.kind === "channel") {
+    return params.target.id;
+  }
+  if (params.target.kind === "channel-name") {
+    return await resolveChannelIdByName({
+      baseUrl: params.baseUrl,
+      token: params.token,
+      name: params.target.name,
+      allowPrivateNetwork: params.allowPrivateNetwork,
+    });
+  }
+  const userId = params.target.id
+    ? params.target.id
+    : await resolveUserIdByUsername({
+        baseUrl: params.baseUrl,
+        token: params.token,
+        username: params.target.username ?? "",
+        allowPrivateNetwork: params.allowPrivateNetwork,
+      });
+  const dmKey = `${cacheKey(params.baseUrl, params.token)}::dm::${userId}`;
+  const cachedDm = dmChannelCache.get(dmKey);
+  if (cachedDm) {
+    return cachedDm;
+  }
+  const botUser = await resolveBotUser(params.baseUrl, params.token, params.allowPrivateNetwork);
+  const client = createMattermostClient({
+    baseUrl: params.baseUrl,
+    botToken: params.token,
+    allowPrivateNetwork: params.allowPrivateNetwork,
+  });
+
+  const channel = await createMattermostDirectChannelWithRetry(client, [botUser.id, userId], {
+    ...params.dmRetryOptions,
+    onRetry: (attempt, delayMs, error) => {
+      // Call user's onRetry if provided
+      params.dmRetryOptions?.onRetry?.(attempt, delayMs, error);
+      // Log if verbose mode is enabled
+      if (params.logger) {
+        params.logger.warn?.(
+          `DM channel creation retry ${attempt} after ${delayMs}ms: ${error.message}`,
+        );
+      }
+    },
+  });
+  dmChannelCache.set(dmKey, channel.id);
+  return channel.id;
+}
+
+type MattermostSendContext = {
+  cfg: OpenClawConfig;
+  accountId: string;
+  token: string;
+  baseUrl: string;
+  channelId: string;
+  allowPrivateNetwork?: boolean;
+};
+
+async function resolveMattermostSendContext(
+  to: string,
+  opts: MattermostSendOpts = {},
+): Promise<MattermostSendContext> {
+  const core = getCore();
+  const logger = core.logging.getChildLogger({ module: "mattermost" });
+  const cfg = opts.cfg ?? core.config.loadConfig();
+  const account = resolveMattermostAccount({
+    cfg,
+    accountId: opts.accountId,
+  });
+  const token = opts.botToken?.trim() || account.botToken?.trim();
+  if (!token) {
+    throw new Error(
+      `Mattermost bot token missing for account "${account.accountId}" (set channels.mattermost.accounts.${account.accountId}.botToken or MATTERMOST_BOT_TOKEN for default).`,
+    );
+  }
+  const baseUrl = normalizeMattermostBaseUrl(opts.baseUrl ?? account.baseUrl);
+  if (!baseUrl) {
+    throw new Error(
+      `Mattermost baseUrl missing for account "${account.accountId}" (set channels.mattermost.accounts.${account.accountId}.baseUrl or MATTERMOST_URL for default).`,
+    );
+  }
+
+  const trimmedTo = to?.trim() ?? "";
+  const opaqueTarget = await resolveMattermostOpaqueTarget({
+    input: trimmedTo,
+    token,
+    baseUrl,
+  });
+  const target =
+    opaqueTarget?.kind === "user"
+      ? { kind: "user" as const, id: opaqueTarget.id }
+      : opaqueTarget?.kind === "channel"
+        ? { kind: "channel" as const, id: opaqueTarget.id }
+        : parseMattermostTarget(trimmedTo);
+  // Build retry options from account config, allowing opts to override
+  const accountRetryConfig: CreateDmChannelRetryOptions | undefined = account.config.dmChannelRetry
+    ? {
+        maxRetries: account.config.dmChannelRetry.maxRetries,
+        initialDelayMs: account.config.dmChannelRetry.initialDelayMs,
+        maxDelayMs: account.config.dmChannelRetry.maxDelayMs,
+        timeoutMs: account.config.dmChannelRetry.timeoutMs,
+      }
+    : undefined;
+  const dmRetryOptions = mergeDmRetryOptions(accountRetryConfig, opts.dmRetryOptions);
+
+  const allowPrivateNetwork = account.config.allowPrivateNetwork === true;
+  const channelId = await resolveTargetChannelId({
+    target,
+    baseUrl,
+    token,
+    allowPrivateNetwork,
+    dmRetryOptions,
+    logger: core.logging.shouldLogVerbose() ? logger : undefined,
+  });
+
+  return {
+    cfg,
+    accountId: account.accountId,
+    token,
+    baseUrl,
+    channelId,
+    allowPrivateNetwork,
+  };
+}
+
+export async function resolveMattermostSendChannelId(
+  to: string,
+  opts: MattermostSendOpts = {},
+): Promise<string> {
+  return (await resolveMattermostSendContext(to, opts)).channelId;
+}
+
+export async function sendMessageMattermost(
+  to: string,
+  text: string,
+  opts: MattermostSendOpts = {},
+): Promise<MattermostSendResult> {
+  const core = getCore();
+  const logger = core.logging.getChildLogger({ module: "mattermost" });
+  const { cfg, accountId, token, baseUrl, channelId, allowPrivateNetwork } =
+    await resolveMattermostSendContext(to, opts);
+
+  const client = createMattermostClient({ baseUrl, botToken: token, allowPrivateNetwork });
+  let props = opts.props;
+  if (!props && Array.isArray(opts.buttons) && opts.buttons.length > 0) {
+    setInteractionSecret(accountId, token);
+    props = buildButtonProps({
+      callbackUrl: resolveInteractionCallbackUrl(accountId, {
+        gateway: cfg.gateway,
+        interactions: resolveMattermostAccount({
+          cfg,
+          accountId,
+        }).config?.interactions,
+      }),
+      accountId,
+      channelId,
+      buttons: opts.buttons,
+      text: opts.attachmentText,
+    });
+  }
+  let message = text?.trim() ?? "";
+  let fileIds: string[] | undefined;
+  let uploadError: Error | undefined;
+  const mediaUrl = opts.mediaUrl?.trim();
+  if (mediaUrl) {
+    try {
+      const media = await loadOutboundMediaFromUrl(mediaUrl, {
+        mediaLocalRoots: opts.mediaLocalRoots,
+        mediaReadFile: opts.mediaReadFile,
+      });
+      const fileInfo = await uploadMattermostFile(client, {
+        channelId,
+        buffer: media.buffer,
+        fileName: media.fileName ?? "upload",
+        contentType: media.contentType ?? undefined,
+      });
+      fileIds = [fileInfo.id];
+    } catch (err) {
+      uploadError = err instanceof Error ? err : new Error(String(err));
+      if (core.logging.shouldLogVerbose()) {
+        logger.debug?.(
+          `mattermost send: media upload failed, falling back to URL text: ${String(err)}`,
+        );
+      }
+      message = normalizeMessage(message, isHttpUrl(mediaUrl) ? mediaUrl : "");
+    }
+  }
+
+  if (message) {
+    const tableMode = resolveMarkdownTableMode({
+      cfg,
+      channel: "mattermost",
+      accountId,
+    });
+    message = convertMarkdownTables(message, tableMode);
+  }
+
+  if (!message && (!fileIds || fileIds.length === 0)) {
+    if (uploadError) {
+      throw new Error(`Mattermost media upload failed: ${uploadError.message}`);
+    }
+    throw new Error("Mattermost message is empty");
+  }
+
+  const post = await createMattermostPost(client, {
+    channelId,
+    message,
+    rootId: opts.replyToId,
+    fileIds,
+    props,
+  });
+
+  recordMattermostOutboundActivity(accountId);
+
+  return {
+    messageId: post.id ?? "unknown",
+    channelId,
+  };
+}

extensions/mattermost/src/mattermost/slash-commands.test.ts

@@ -0,0 +1,164 @@
+import { describe, expect, it, vi } from "vitest";
+import type { MattermostClient } from "./client.js";
+import {
+  DEFAULT_COMMAND_SPECS,
+  parseSlashCommandPayload,
+  registerSlashCommands,
+  resolveCallbackUrl,
+  resolveCommandText,
+  resolveSlashCommandConfig,
+} from "./slash-commands.js";
+
+describe("slash-commands", () => {
+  async function registerSingleStatusCommand(
+    requestImpl: (path: string, init?: { method?: string }) => Promise<unknown>,
+  ) {
+    const client: MattermostClient = {
+      baseUrl: "https://chat.example.com",
+      apiBaseUrl: "https://chat.example.com/api/v4",
+      // pragma: allowlist secret
+      token: "bot-token",
+      request: async <T>(path: string, init?: RequestInit) => (await requestImpl(path, init)) as T,
+      fetchImpl: vi.fn<typeof fetch>(),
+    };
+    return registerSlashCommands({
+      client,
+      teamId: "team-1",
+      creatorUserId: "bot-user",
+      callbackUrl: "http://gateway/callback",
+      commands: [
+        {
+          trigger: "oc_status",
+          description: "status",
+          autoComplete: true,
+        },
+      ],
+    });
+  }
+
+  it("parses application/x-www-form-urlencoded payloads", () => {
+    const payload = parseSlashCommandPayload(
+      "token=t1&team_id=team&channel_id=ch1&user_id=u1&command=%2Foc_status&text=now",
+      "application/x-www-form-urlencoded",
+    );
+    expect(payload).toMatchObject({
+      token: "t1",
+      team_id: "team",
+      channel_id: "ch1",
+      user_id: "u1",
+      command: "/oc_status",
+      text: "now",
+    });
+  });
+
+  it("parses application/json payloads", () => {
+    const payload = parseSlashCommandPayload(
+      JSON.stringify({
+        token: "t2",
+        team_id: "team",
+        channel_id: "ch2",
+        user_id: "u2",
+        command: "/oc_model",
+        text: "gpt-5",
+      }),
+      "application/json; charset=utf-8",
+    );
+    expect(payload).toMatchObject({
+      token: "t2",
+      command: "/oc_model",
+      text: "gpt-5",
+    });
+  });
+
+  it("returns null for malformed payloads missing required fields", () => {
+    const payload = parseSlashCommandPayload(
+      JSON.stringify({ token: "t3", command: "/oc_help" }),
+      "application/json",
+    );
+    expect(payload).toBeNull();
+  });
+
+  it("resolves command text with trigger map fallback", () => {
+    const triggerMap = new Map<string, string>([["oc_status", "status"]]);
+    expect(resolveCommandText("oc_status", "   ", triggerMap)).toBe("/status");
+    expect(resolveCommandText("oc_status", " now ", triggerMap)).toBe("/status now");
+    expect(resolveCommandText("oc_models", " openai ", undefined)).toBe("/models openai");
+    expect(resolveCommandText("oc_help", "", undefined)).toBe("/help");
+  });
+
+  it("registers both public model slash commands", () => {
+    expect(
+      DEFAULT_COMMAND_SPECS.filter(
+        (spec) => spec.trigger === "oc_model" || spec.trigger === "oc_models",
+      ).map((spec) => spec.trigger),
+    ).toEqual(["oc_model", "oc_models"]);
+  });
+
+  it("normalizes callback path in slash config", () => {
+    const config = resolveSlashCommandConfig({ callbackPath: "api/channels/mattermost/command" });
+    expect(config.callbackPath).toBe("/api/channels/mattermost/command");
+  });
+
+  it("falls back to localhost callback URL for wildcard bind hosts", () => {
+    const config = resolveSlashCommandConfig({ callbackPath: "/api/channels/mattermost/command" });
+    const callbackUrl = resolveCallbackUrl({
+      config,
+      gatewayPort: 18789,
+      gatewayHost: "0.0.0.0",
+    });
+    expect(callbackUrl).toBe("http://localhost:18789/api/channels/mattermost/command");
+  });
+
+  it("reuses existing command when trigger already points to callback URL", async () => {
+    const request = vi.fn(async (path: string) => {
+      if (path.startsWith("/commands?team_id=")) {
+        return [
+          {
+            id: "cmd-1",
+            token: "tok-1",
+            team_id: "team-1",
+            creator_id: "bot-user",
+            trigger: "oc_status",
+            method: "P",
+            url: "http://gateway/callback",
+            auto_complete: true,
+          },
+        ];
+      }
+      throw new Error(`unexpected request path: ${path}`);
+    });
+    const result = await registerSingleStatusCommand(request);
+
+    expect(result).toHaveLength(1);
+    expect(result[0]?.managed).toBe(false);
+    expect(result[0]?.id).toBe("cmd-1");
+    expect(request).toHaveBeenCalledTimes(1);
+  });
+
+  it("skips foreign command trigger collisions instead of mutating non-owned commands", async () => {
+    const request = vi.fn(async (path: string, init?: { method?: string }) => {
+      if (path.startsWith("/commands?team_id=")) {
+        return [
+          {
+            id: "cmd-foreign-1",
+            token: "tok-foreign-1",
+            team_id: "team-1",
+            creator_id: "another-bot-user",
+            trigger: "oc_status",
+            method: "P",
+            url: "http://foreign/callback",
+            auto_complete: true,
+          },
+        ];
+      }
+      if (init?.method === "POST" || init?.method === "PUT" || init?.method === "DELETE") {
+        throw new Error("should not mutate foreign commands");
+      }
+      throw new Error(`unexpected request path: ${path}`);
+    });
+    const result = await registerSingleStatusCommand(request);
+
+    expect(result).toHaveLength(0);
+    expect(request).toHaveBeenCalledTimes(1);
+  });
+});

extensions/mattermost/src/mattermost/slash-commands.ts

@@ -0,0 +1,588 @@
+/**
+ * Mattermost native slash command support.
+ *
+ * Registers custom slash commands via the Mattermost REST API and handles
+ * incoming command callbacks via an HTTP endpoint on the gateway.
+ *
+ * Architecture:
+ * - On startup, registers commands with MM via POST /api/v4/commands
+ * - MM sends HTTP POST to callbackUrl when a user invokes a command
+ * - The callback handler reconstructs the text as `/<command> <args>` and
+ *   routes it through the standard inbound reply pipeline
+ * - On shutdown, cleans up registered commands via DELETE /api/v4/commands/{id}
+ */
+
+import type { MattermostClient } from "./client.js";
+
+// ─── Types ───────────────────────────────────────────────────────────────────
+
+export type MattermostSlashCommandConfig = {
+  /** Enable native slash commands. "auto" resolves to false for now (opt-in). */
+  native: boolean | "auto";
+  /** Also register skill-based commands. */
+  nativeSkills: boolean | "auto";
+  /** Path for the callback endpoint on the gateway HTTP server. */
+  callbackPath: string;
+  /**
+   * Explicit callback URL override (e.g. behind a reverse proxy).
+   * If not set, auto-derived from baseUrl + gateway port + callbackPath.
+   */
+  callbackUrl?: string;
+};
+
+export type MattermostCommandSpec = {
+  trigger: string;
+  description: string;
+  autoComplete: boolean;
+  autoCompleteHint?: string;
+  /** Original command name (for skill commands that start with oc_) */
+  originalName?: string;
+};
+
+export type MattermostRegisteredCommand = {
+  id: string;
+  trigger: string;
+  teamId: string;
+  token: string;
+  /** True when this process created the command and should delete it on shutdown. */
+  managed: boolean;
+};
+
+/**
+ * Payload sent by Mattermost when a slash command is invoked.
+ * Can arrive as application/x-www-form-urlencoded or application/json.
+ */
+export type MattermostSlashCommandPayload = {
+  token: string;
+  team_id: string;
+  team_domain?: string;
+  channel_id: string;
+  channel_name?: string;
+  user_id: string;
+  user_name?: string;
+  command: string; // e.g. "/status"
+  text: string; // args after the trigger word
+  trigger_id?: string;
+  response_url?: string;
+};
+
+/**
+ * Response format for Mattermost slash command callbacks.
+ */
+export type MattermostSlashCommandResponse = {
+  response_type?: "ephemeral" | "in_channel";
+  text: string;
+  username?: string;
+  icon_url?: string;
+  goto_location?: string;
+  attachments?: unknown[];
+};
+
+// ─── MM API types ────────────────────────────────────────────────────────────
+
+type MattermostCommandCreate = {
+  team_id: string;
+  trigger: string;
+  method: "P" | "G";
+  url: string;
+  description?: string;
+  auto_complete: boolean;
+  auto_complete_desc?: string;
+  auto_complete_hint?: string;
+  token?: string;
+  creator_id?: string;
+};
+
+type MattermostCommandUpdate = {
+  id: string;
+  team_id: string;
+  trigger: string;
+  method: "P" | "G";
+  url: string;
+  description?: string;
+  auto_complete: boolean;
+  auto_complete_desc?: string;
+  auto_complete_hint?: string;
+};
+
+type MattermostCommandResponse = {
+  id: string;
+  token: string;
+  team_id: string;
+  trigger: string;
+  method: string;
+  url: string;
+  auto_complete: boolean;
+  auto_complete_desc?: string;
+  auto_complete_hint?: string;
+  creator_id?: string;
+  create_at?: number;
+  update_at?: number;
+  delete_at?: number;
+};
+
+// ─── Default commands ────────────────────────────────────────────────────────
+
+/**
+ * Built-in OpenClaw commands to register as native slash commands.
+ * These mirror the text-based commands already handled by the gateway.
+ */
+export const DEFAULT_COMMAND_SPECS: MattermostCommandSpec[] = [
+  {
+    trigger: "oc_status",
+    originalName: "status",
+    description: "Show session status (model, usage, uptime)",
+    autoComplete: true,
+  },
+  {
+    trigger: "oc_model",
+    originalName: "model",
+    description: "View or change the current model",
+    autoComplete: true,
+    autoCompleteHint: "[model-name]",
+  },
+  {
+    trigger: "oc_models",
+    originalName: "models",
+    description: "Browse available models",
+    autoComplete: true,
+    autoCompleteHint: "[provider]",
+  },
+  {
+    trigger: "oc_new",
+    originalName: "new",
+    description: "Start a new conversation session",
+    autoComplete: true,
+  },
+  {
+    trigger: "oc_help",
+    originalName: "help",
+    description: "Show available commands",
+    autoComplete: true,
+  },
+  {
+    trigger: "oc_think",
+    originalName: "think",
+    description: "Set thinking/reasoning level",
+    autoComplete: true,
+    autoCompleteHint: "[off|low|medium|high]",
+  },
+  {
+    trigger: "oc_reasoning",
+    originalName: "reasoning",
+    description: "Toggle reasoning mode",
+    autoComplete: true,
+    autoCompleteHint: "[on|off]",
+  },
+  {
+    trigger: "oc_verbose",
+    originalName: "verbose",
+    description: "Toggle verbose mode",
+    autoComplete: true,
+    autoCompleteHint: "[on|off]",
+  },
+];
+
+// ─── Command registration ────────────────────────────────────────────────────
+
+/**
+ * List existing custom slash commands for a team.
+ */
+export async function listMattermostCommands(
+  client: MattermostClient,
+  teamId: string,
+): Promise<MattermostCommandResponse[]> {
+  return await client.request<MattermostCommandResponse[]>(
+    `/commands?team_id=${encodeURIComponent(teamId)}&custom_only=true`,
+  );
+}
+
+/**
+ * Create a custom slash command on a Mattermost team.
+ */
+export async function createMattermostCommand(
+  client: MattermostClient,
+  params: MattermostCommandCreate,
+): Promise<MattermostCommandResponse> {
+  return await client.request<MattermostCommandResponse>("/commands", {
+    method: "POST",
+    body: JSON.stringify(params),
+  });
+}
+
+/**
+ * Delete a custom slash command.
+ */
+export async function deleteMattermostCommand(
+  client: MattermostClient,
+  commandId: string,
+): Promise<void> {
+  await client.request<Record<string, unknown>>(`/commands/${encodeURIComponent(commandId)}`, {
+    method: "DELETE",
+  });
+}
+
+/**
+ * Update an existing custom slash command.
+ */
+export async function updateMattermostCommand(
+  client: MattermostClient,
+  params: MattermostCommandUpdate,
+): Promise<MattermostCommandResponse> {
+  return await client.request<MattermostCommandResponse>(
+    `/commands/${encodeURIComponent(params.id)}`,
+    {
+      method: "PUT",
+      body: JSON.stringify(params),
+    },
+  );
+}
+
+/**
+ * Register all OpenClaw slash commands for a given team.
+ * Skips commands that are already registered with the same trigger + callback URL.
+ * Returns the list of newly created command IDs.
+ */
+export async function registerSlashCommands(params: {
+  client: MattermostClient;
+  teamId: string;
+  creatorUserId: string;
+  callbackUrl: string;
+  commands: MattermostCommandSpec[];
+  log?: (msg: string) => void;
+}): Promise<MattermostRegisteredCommand[]> {
+  const { client, teamId, creatorUserId, callbackUrl, commands, log } = params;
+  const normalizedCreatorUserId = creatorUserId.trim();
+  if (!normalizedCreatorUserId) {
+    throw new Error("creatorUserId is required for slash command reconciliation");
+  }
+
+  // Fetch existing commands to avoid duplicates
+  let existing: MattermostCommandResponse[] = [];
+  try {
+    existing = await listMattermostCommands(client, teamId);
+  } catch (err) {
+    log?.(`mattermost: failed to list existing commands: ${String(err)}`);
+    // Fail closed: if we can't list existing commands, we should not attempt to
+    // create/update anything because we may create duplicates and end up with an
+    // empty/partial token set (causing callbacks to be rejected until restart).
+    throw err;
+  }
+
+  const existingByTrigger = new Map<string, MattermostCommandResponse[]>();
+  for (const cmd of existing) {
+    const list = existingByTrigger.get(cmd.trigger) ?? [];
+    list.push(cmd);
+    existingByTrigger.set(cmd.trigger, list);
+  }
+
+  const registered: MattermostRegisteredCommand[] = [];
+
+  for (const spec of commands) {
+    const existingForTrigger = existingByTrigger.get(spec.trigger) ?? [];
+    const ownedCommands = existingForTrigger.filter(
+      (cmd) => cmd.creator_id?.trim() === normalizedCreatorUserId,
+    );
+    const foreignCommands = existingForTrigger.filter(
+      (cmd) => cmd.creator_id?.trim() !== normalizedCreatorUserId,
+    );
+
+    if (ownedCommands.length === 0 && foreignCommands.length > 0) {
+      log?.(
+        `mattermost: trigger /${spec.trigger} already used by non-OpenClaw command(s); skipping to avoid mutating external integrations`,
+      );
+      continue;
+    }
+
+    if (ownedCommands.length > 1) {
+      log?.(
+        `mattermost: multiple owned commands found for /${spec.trigger}; using the first and leaving extras untouched`,
+      );
+    }
+
+    const existingCmd = ownedCommands[0];
+
+    // Already registered with the correct callback URL
+    if (existingCmd && existingCmd.url === callbackUrl) {
+      log?.(`mattermost: command /${spec.trigger} already registered (id=${existingCmd.id})`);
+      registered.push({
+        id: existingCmd.id,
+        trigger: spec.trigger,
+        teamId,
+        token: existingCmd.token,
+        managed: false,
+      });
+      continue;
+    }
+
+    // Exists but points to a different URL: attempt to reconcile by updating
+    // (useful during callback URL migrations).
+    if (existingCmd && existingCmd.url !== callbackUrl) {
+      log?.(
+        `mattermost: command /${spec.trigger} exists with different callback URL; updating (id=${existingCmd.id})`,
+      );
+      try {
+        const updated = await updateMattermostCommand(client, {
+          id: existingCmd.id,
+          team_id: teamId,
+          trigger: spec.trigger,
+          method: "P",
+          url: callbackUrl,
+          description: spec.description,
+          auto_complete: spec.autoComplete,
+          auto_complete_desc: spec.description,
+          auto_complete_hint: spec.autoCompleteHint,
+        });
+        registered.push({
+          id: updated.id,
+          trigger: spec.trigger,
+          teamId,
+          token: updated.token,
+          managed: false,
+        });
+        continue;
+      } catch (err) {
+        log?.(
+          `mattermost: failed to update command /${spec.trigger} (id=${existingCmd.id}): ${String(err)}`,
+        );
+        // Fallback: try delete+recreate for commands owned by this bot user.
+        try {
+          await deleteMattermostCommand(client, existingCmd.id);
+          log?.(`mattermost: deleted stale command /${spec.trigger} (id=${existingCmd.id})`);
+        } catch (deleteErr) {
+          log?.(
+            `mattermost: failed to delete stale command /${spec.trigger} (id=${existingCmd.id}): ${String(deleteErr)}`,
+          );
+          // Can't reconcile; skip this command.
+          continue;
+        }
+        // Continue on to create below.
+      }
+    }
+
+    try {
+      const created = await createMattermostCommand(client, {
+        team_id: teamId,
+        trigger: spec.trigger,
+        method: "P",
+        url: callbackUrl,
+        description: spec.description,
+        auto_complete: spec.autoComplete,
+        auto_complete_desc: spec.description,
+        auto_complete_hint: spec.autoCompleteHint,
+      });
+      log?.(`mattermost: registered command /${spec.trigger} (id=${created.id})`);
+      registered.push({
+        id: created.id,
+        trigger: spec.trigger,
+        teamId,
+        token: created.token,
+        managed: true,
+      });
+    } catch (err) {
+      log?.(`mattermost: failed to register command /${spec.trigger}: ${String(err)}`);
+    }
+  }
+
+  return registered;
+}
+
+/**
+ * Clean up all registered slash commands.
+ */
+export async function cleanupSlashCommands(params: {
+  client: MattermostClient;
+  commands: MattermostRegisteredCommand[];
+  log?: (msg: string) => void;
+}): Promise<void> {
+  const { client, commands, log } = params;
+  for (const cmd of commands) {
+    if (!cmd.managed) {
+      continue;
+    }
+    try {
+      await deleteMattermostCommand(client, cmd.id);
+      log?.(`mattermost: deleted command /${cmd.trigger} (id=${cmd.id})`);
+    } catch (err) {
+      log?.(`mattermost: failed to delete command /${cmd.trigger}: ${String(err)}`);
+    }
+  }
+}
+
+// ─── Callback parsing ────────────────────────────────────────────────────────
+
+/**
+ * Parse a Mattermost slash command callback payload from a URL-encoded or JSON body.
+ */
+export function parseSlashCommandPayload(
+  body: string,
+  contentType?: string,
+): MattermostSlashCommandPayload | null {
+  if (!body) {
+    return null;
+  }
+
+  try {
+    if (contentType?.includes("application/json")) {
+      const parsed = JSON.parse(body) as Record<string, unknown>;
+
+      // Validate required fields (same checks as the form-encoded branch)
+      const token = typeof parsed.token === "string" ? parsed.token : "";
+      const teamId = typeof parsed.team_id === "string" ? parsed.team_id : "";
+      const channelId = typeof parsed.channel_id === "string" ? parsed.channel_id : "";
+      const userId = typeof parsed.user_id === "string" ? parsed.user_id : "";
+      const command = typeof parsed.command === "string" ? parsed.command : "";
+
+      if (!token || !teamId || !channelId || !userId || !command) {
+        return null;
+      }
+
+      return {
+        token,
+        team_id: teamId,
+        team_domain: typeof parsed.team_domain === "string" ? parsed.team_domain : undefined,
+        channel_id: channelId,
+        channel_name: typeof parsed.channel_name === "string" ? parsed.channel_name : undefined,
+        user_id: userId,
+        user_name: typeof parsed.user_name === "string" ? parsed.user_name : undefined,
+        command,
+        text: typeof parsed.text === "string" ? parsed.text : "",
+        trigger_id: typeof parsed.trigger_id === "string" ? parsed.trigger_id : undefined,
+        response_url: typeof parsed.response_url === "string" ? parsed.response_url : undefined,
+      };
+    }
+
+    // Default: application/x-www-form-urlencoded
+    const params = new URLSearchParams(body);
+    const token = params.get("token");
+    const teamId = params.get("team_id");
+    const channelId = params.get("channel_id");
+    const userId = params.get("user_id");
+    const command = params.get("command");
+
+    if (!token || !teamId || !channelId || !userId || !command) {
+      return null;
+    }
+
+    return {
+      token,
+      team_id: teamId,
+      team_domain: params.get("team_domain") ?? undefined,
+      channel_id: channelId,
+      channel_name: params.get("channel_name") ?? undefined,
+      user_id: userId,
+      user_name: params.get("user_name") ?? undefined,
+      command,
+      text: params.get("text") ?? "",
+      trigger_id: params.get("trigger_id") ?? undefined,
+      response_url: params.get("response_url") ?? undefined,
+    };
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Map the trigger word back to the original OpenClaw command name.
+ * e.g. "oc_status" -> "/status", "oc_model" -> "/model"
+ */
+export function resolveCommandText(
+  trigger: string,
+  text: string,
+  triggerMap?: ReadonlyMap<string, string>,
+): string {
+  // Use the trigger map if available for accurate name resolution
+  const commandName =
+    triggerMap?.get(trigger) ?? (trigger.startsWith("oc_") ? trigger.slice(3) : trigger);
+  const args = text.trim();
+  return args ? `/${commandName} ${args}` : `/${commandName}`;
+}
+
+// ─── Config resolution ───────────────────────────────────────────────────────
+
+const DEFAULT_CALLBACK_PATH = "/api/channels/mattermost/command";
+
+/**
+ * Ensure the callback path starts with a leading `/` to prevent
+ * malformed URLs like `http://host:portapi/...`.
+ */
+function normalizeCallbackPath(path: string): string {
+  const trimmed = path.trim();
+  if (!trimmed) return DEFAULT_CALLBACK_PATH;
+  return trimmed.startsWith("/") ? trimmed : `/${trimmed}`;
+}
+
+export function resolveSlashCommandConfig(
+  raw?: Partial<MattermostSlashCommandConfig>,
+): MattermostSlashCommandConfig {
+  return {
+    native: raw?.native ?? "auto",
+    nativeSkills: raw?.nativeSkills ?? "auto",
+    callbackPath: normalizeCallbackPath(raw?.callbackPath ?? DEFAULT_CALLBACK_PATH),
+    callbackUrl: raw?.callbackUrl?.trim() || undefined,
+  };
+}
+
+export function isSlashCommandsEnabled(config: MattermostSlashCommandConfig): boolean {
+  if (config.native === true) {
+    return true;
+  }
+  if (config.native === false) {
+    return false;
+  }
+  // "auto" defaults to false for mattermost (opt-in)
+  return false;
+}
+
+export function collectMattermostSlashCallbackPaths(raw?: Partial<MattermostSlashCommandConfig>) {
+  const config = resolveSlashCommandConfig(raw);
+  const paths = new Set<string>([config.callbackPath]);
+  if (typeof config.callbackUrl === "string" && config.callbackUrl.trim()) {
+    try {
+      const pathname = new URL(config.callbackUrl).pathname;
+      if (pathname) {
+        paths.add(pathname);
+      }
+    } catch {
+      // Ignore invalid callback URLs and keep the normalized callback path only.
+    }
+  }
+  return [...paths];
+}
+
+/**
+ * Build the callback URL that Mattermost will POST to when a command is invoked.
+ */
+export function resolveCallbackUrl(params: {
+  config: MattermostSlashCommandConfig;
+  gatewayPort: number;
+  gatewayHost?: string;
+}): string {
+  if (params.config.callbackUrl) {
+    return params.config.callbackUrl;
+  }
+
+  const isWildcardBindHost = (rawHost: string): boolean => {
+    const trimmed = rawHost.trim();
+    if (!trimmed) return false;
+    const host = trimmed.startsWith("[") && trimmed.endsWith("]") ? trimmed.slice(1, -1) : trimmed;
+
+    // NOTE: Wildcard listen hosts are valid bind addresses but are not routable callback
+    // destinations. Don't emit callback URLs like http://0.0.0.0:3015/... or http://[::]:3015/...
+    // when an operator sets gateway.customBindHost.
+    return host === "0.0.0.0" || host === "::" || host === "0:0:0:0:0:0:0:0" || host === "::0";
+  };
+
+  let host =
+    params.gatewayHost && !isWildcardBindHost(params.gatewayHost)
+      ? params.gatewayHost
+      : "localhost";
+  const path = normalizeCallbackPath(params.config.callbackPath);
+
+  // Bracket IPv6 literals so the URL is valid: http://[::1]:3015/...
+  if (host.includes(":") && !(host.startsWith("[") && host.endsWith("]"))) {
+    host = `[${host}]`;
+  }
+
+  return `http://${host}:${params.gatewayPort}${path}`;
+}

extensions/mattermost/src/mattermost/slash-http.send-config.test.ts

@@ -0,0 +1,265 @@
+import { ServerResponse, type IncomingMessage } from "node:http";
+import { PassThrough } from "node:stream";
+import type { OpenClawConfig, RuntimeEnv } from "openclaw/plugin-sdk/mattermost";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import type { ResolvedMattermostAccount } from "./accounts.js";
+
+const mockState = vi.hoisted(() => ({
+  readRequestBodyWithLimit: vi.fn(async () => "token=valid-token"),
+  parseSlashCommandPayload: vi.fn(() => ({
+    token: "valid-token",
+    command: "/oc_models",
+    text: "models",
+    channel_id: "chan-1",
+    user_id: "user-1",
+    user_name: "alice",
+    team_id: "team-1",
+  })),
+  resolveCommandText: vi.fn((_trigger: string, text: string) => text),
+  buildModelsProviderData: vi.fn(async () => ({ providers: [], modelNames: new Map() })),
+  resolveMattermostModelPickerEntry: vi.fn(() => ({ kind: "summary" })),
+  authorizeMattermostCommandInvocation: vi.fn(() => ({
+    ok: true,
+    commandAuthorized: true,
+    channelInfo: { id: "chan-1", type: "O", name: "town-square", display_name: "Town Square" },
+    kind: "channel",
+    chatType: "channel",
+    channelName: "town-square",
+    channelDisplay: "Town Square",
+    roomLabel: "#town-square",
+  })),
+  createMattermostClient: vi.fn(() => ({})),
+  fetchMattermostChannel: vi.fn(async () => ({
+    id: "chan-1",
+    type: "O",
+    name: "town-square",
+    display_name: "Town Square",
+  })),
+  sendMessageMattermost: vi.fn(async () => ({ messageId: "post-1", channelId: "chan-1" })),
+  normalizeMattermostAllowList: vi.fn((value: unknown) => value),
+}));
+
+vi.mock("./runtime-api.js", () => {
+  return {
+    buildModelsProviderData: mockState.buildModelsProviderData,
+    createChannelReplyPipeline: vi.fn(() => ({
+      onModelSelected: vi.fn(),
+      typingCallbacks: {},
+    })),
+    createDedupeCache: vi.fn(() => ({
+      check: () => false,
+    })),
+    createReplyPrefixOptions: vi.fn(() => ({})),
+    createTypingCallbacks: vi.fn(() => ({ onReplyStart: vi.fn() })),
+    isRequestBodyLimitError: vi.fn(() => false),
+    logTypingFailure: vi.fn(),
+    formatInboundFromLabel: vi.fn(() => ""),
+    rawDataToString: vi.fn((value: unknown) => String(value ?? "")),
+    readRequestBodyWithLimit: mockState.readRequestBodyWithLimit,
+    resolveThreadSessionKeys: vi.fn((params: { baseSessionKey: string }) => ({
+      sessionKey: params.baseSessionKey,
+      parentSessionKey: undefined,
+    })),
+  };
+});
+
+vi.mock("../runtime.js", () => ({
+  getMattermostRuntime: () => ({
+    channel: {
+      commands: {
+        shouldHandleTextCommands: () => true,
+      },
+      text: {
+        hasControlCommand: () => false,
+      },
+      pairing: {
+        readAllowFromStore: vi.fn(async () => []),
+      },
+      routing: {
+        resolveAgentRoute: vi.fn(() => ({
+          agentId: "agent-1",
+          sessionKey: "mattermost:session:1",
+          accountId: "default",
+        })),
+      },
+    },
+  }),
+}));
+
+vi.mock("./client.js", async () => {
+  const actual = await vi.importActual<typeof import("./client.js")>("./client.js");
+  return {
+    ...actual,
+    createMattermostClient: mockState.createMattermostClient,
+    fetchMattermostChannel: mockState.fetchMattermostChannel,
+    normalizeMattermostBaseUrl: vi.fn((value: string | undefined) => value?.trim() ?? ""),
+    sendMattermostTyping: vi.fn(),
+  };
+});
+
+vi.mock("./model-picker.js", () => ({
+  renderMattermostModelSummaryView: vi.fn(),
+  renderMattermostModelsPickerView: vi.fn(),
+  renderMattermostProviderPickerView: vi.fn(),
+  resolveMattermostModelPickerCurrentModel: vi.fn(),
+  resolveMattermostModelPickerEntry: mockState.resolveMattermostModelPickerEntry,
+}));
+
+vi.mock("./monitor-auth.js", () => ({
+  authorizeMattermostCommandInvocation: mockState.authorizeMattermostCommandInvocation,
+  normalizeMattermostAllowList: mockState.normalizeMattermostAllowList,
+}));
+
+vi.mock("./reply-delivery.js", () => ({
+  deliverMattermostReplyPayload: vi.fn(),
+}));
+
+vi.mock("./send.js", () => ({
+  sendMessageMattermost: mockState.sendMessageMattermost,
+}));
+
+vi.mock("./slash-commands.js", () => ({
+  parseSlashCommandPayload: mockState.parseSlashCommandPayload,
+  resolveCommandText: mockState.resolveCommandText,
+}));
+
+let createSlashCommandHttpHandler: typeof import("./slash-http.js").createSlashCommandHttpHandler;
+
+function createRequest(body = "token=valid-token"): IncomingMessage {
+  const req = new PassThrough();
+  const incoming = req as PassThrough & IncomingMessage;
+  incoming.method = "POST";
+  incoming.headers = {
+    "content-type": "application/x-www-form-urlencoded",
+  };
+  process.nextTick(() => {
+    req.end(body);
+  });
+  return incoming;
+}
+
+function createResponse(): {
+  res: ServerResponse;
+  getBody: () => string;
+} {
+  let body = "";
+  class TestServerResponse extends ServerResponse {
+    override setHeader() {
+      return this;
+    }
+
+    override end(): this;
+    override end(cb: () => void): this;
+    override end(chunk: string | Buffer | Uint8Array, cb?: () => void): this;
+    override end(
+      chunk: string | Buffer | Uint8Array,
+      encoding: BufferEncoding,
+      cb?: () => void,
+    ): this;
+    override end(
+      chunkOrCb?: string | Buffer | Uint8Array | (() => void),
+      encodingOrCb?: BufferEncoding | (() => void),
+      cb?: () => void,
+    ): this {
+      const chunk = typeof chunkOrCb === "function" ? undefined : chunkOrCb;
+      const callback =
+        typeof chunkOrCb === "function"
+          ? chunkOrCb
+          : typeof encodingOrCb === "function"
+            ? encodingOrCb
+            : cb;
+      body = chunk ? String(chunk) : "";
+      callback?.();
+      return this;
+    }
+  }
+
+  const res = new TestServerResponse(createRequest(""));
+  return {
+    res,
+    getBody: () => body,
+  };
+}
+
+const accountFixture: ResolvedMattermostAccount = {
+  accountId: "default",
+  enabled: true,
+  // pragma: allowlist secret
+  botToken: "bot-token",
+  baseUrl: "https://chat.example.com",
+  botTokenSource: "config",
+  baseUrlSource: "config",
+  config: {},
+};
+
+describe("slash-http cfg threading", () => {
+  beforeEach(async () => {
+    vi.resetModules();
+    mockState.readRequestBodyWithLimit.mockClear();
+    mockState.parseSlashCommandPayload.mockClear();
+    mockState.resolveCommandText.mockClear();
+    mockState.buildModelsProviderData.mockClear();
+    mockState.resolveMattermostModelPickerEntry.mockClear();
+    mockState.authorizeMattermostCommandInvocation.mockClear();
+    mockState.createMattermostClient.mockClear();
+    mockState.fetchMattermostChannel.mockClear();
+    mockState.sendMessageMattermost.mockClear();
+    mockState.normalizeMattermostAllowList.mockClear();
+    ({ createSlashCommandHttpHandler } = await import("./slash-http.js"));
+  });
+
+  it("passes cfg through the no-models slash reply send path", async () => {
+    const cfg = {
+      channels: {
+        mattermost: {
+          botToken: "exec:secret-ref",
+        },
+      },
+    } as OpenClawConfig;
+    const handler = createSlashCommandHttpHandler({
+      account: accountFixture,
+      cfg,
+      runtime: {} as RuntimeEnv,
+      commandTokens: new Set(["valid-token"]),
+    });
+    const response = createResponse();
+
+    await handler(createRequest(), response.res);
+
+    expect(response.res.statusCode).toBe(200);
+    expect(response.getBody()).toContain("Processing");
+    expect(mockState.sendMessageMattermost).toHaveBeenCalledWith(
+      "channel:chan-1",
+      "No models available.",
+      expect.objectContaining({
+        cfg,
+        accountId: "default",
+      }),
+    );
+  });
+
+  it("does not rely on Set.has for command token validation", async () => {
+    const commandTokens = new Set(["valid-token"]);
+    const hasSpy = vi.fn(() => {
+      throw new Error("Set.has should not be used for slash token validation");
+    });
+    Object.defineProperty(commandTokens, "has", {
+      value: hasSpy,
+      configurable: true,
+    });
+
+    const handler = createSlashCommandHttpHandler({
+      account: accountFixture,
+      cfg: {} as OpenClawConfig,
+      runtime: {} as RuntimeEnv,
+      commandTokens,
+    });
+    const response = createResponse();
+
+    await handler(createRequest(), response.res);
+
+    expect(response.res.statusCode).toBe(200);
+    expect(response.getBody()).toContain("Processing");
+    expect(hasSpy).not.toHaveBeenCalled();
+  });
+});

extensions/mattermost/src/mattermost/slash-http.test.ts

@@ -0,0 +1,158 @@
+import type { IncomingMessage, ServerResponse } from "node:http";
+import { PassThrough } from "node:stream";
+import { describe, expect, it, vi } from "vitest";
+import type { OpenClawConfig, RuntimeEnv } from "../../runtime-api.js";
+import type { ResolvedMattermostAccount } from "./accounts.js";
+import { createSlashCommandHttpHandler } from "./slash-http.js";
+
+function createRequest(params: {
+  method?: string;
+  body?: string;
+  contentType?: string;
+  autoEnd?: boolean;
+}): IncomingMessage {
+  const req = new PassThrough();
+  const incoming = req as PassThrough & IncomingMessage;
+  incoming.method = params.method ?? "POST";
+  incoming.headers = {
+    "content-type": params.contentType ?? "application/x-www-form-urlencoded",
+  };
+  process.nextTick(() => {
+    if (params.body) {
+      req.write(params.body);
+    }
+    if (params.autoEnd !== false) {
+      req.end();
+    }
+  });
+  return incoming;
+}
+
+function createResponse(): {
+  res: ServerResponse;
+  getBody: () => string;
+  getHeaders: () => Map<string, string>;
+} {
+  let body = "";
+  const headers = new Map<string, string>();
+  const res = {
+    statusCode: 200,
+    setHeader(name: string, value: string) {
+      headers.set(name.toLowerCase(), value);
+    },
+    end(chunk?: string | Buffer) {
+      body = chunk ? String(chunk) : "";
+    },
+  } as ServerResponse;
+  return {
+    res,
+    getBody: () => body,
+    getHeaders: () => headers,
+  };
+}
+
+const accountFixture: ResolvedMattermostAccount = {
+  accountId: "default",
+  enabled: true,
+  // pragma: allowlist secret
+  botToken: "bot-token",
+  baseUrl: "https://chat.example.com",
+  botTokenSource: "config",
+  baseUrlSource: "config",
+  config: {},
+};
+
+async function runSlashRequest(params: {
+  commandTokens: Set<string>;
+  body: string;
+  method?: string;
+}) {
+  const handler = createSlashCommandHttpHandler({
+    account: accountFixture,
+    cfg: {} as OpenClawConfig,
+    runtime: {} as RuntimeEnv,
+    commandTokens: params.commandTokens,
+  });
+  const req = createRequest({ method: params.method, body: params.body });
+  const response = createResponse();
+  await handler(req, response.res);
+  return response;
+}
+
+describe("slash-http", () => {
+  it("rejects non-POST methods", async () => {
+    const handler = createSlashCommandHttpHandler({
+      account: accountFixture,
+      cfg: {} as OpenClawConfig,
+      runtime: {} as RuntimeEnv,
+      commandTokens: new Set(["valid-token"]),
+    });
+    const req = createRequest({ method: "GET", body: "" });
+    const response = createResponse();
+
+    await handler(req, response.res);
+
+    expect(response.res.statusCode).toBe(405);
+    expect(response.getBody()).toBe("Method Not Allowed");
+    expect(response.getHeaders().get("allow")).toBe("POST");
+  });
+
+  it("rejects malformed payloads", async () => {
+    const handler = createSlashCommandHttpHandler({
+      account: accountFixture,
+      cfg: {} as OpenClawConfig,
+      runtime: {} as RuntimeEnv,
+      commandTokens: new Set(["valid-token"]),
+    });
+    const req = createRequest({ body: "token=abc&command=%2Foc_status" });
+    const response = createResponse();
+
+    await handler(req, response.res);
+
+    expect(response.res.statusCode).toBe(400);
+    expect(response.getBody()).toContain("Invalid slash command payload");
+  });
+
+  it("fails closed when no command tokens are registered", async () => {
+    const response = await runSlashRequest({
+      commandTokens: new Set<string>(),
+      body: "token=tok1&team_id=t1&channel_id=c1&user_id=u1&command=%2Foc_status&text=",
+    });
+
+    expect(response.res.statusCode).toBe(401);
+    expect(response.getBody()).toContain("Unauthorized: invalid command token.");
+  });
+
+  it("rejects unknown command tokens", async () => {
+    const response = await runSlashRequest({
+      commandTokens: new Set(["known-token"]),
+      body: "token=unknown&team_id=t1&channel_id=c1&user_id=u1&command=%2Foc_status&text=",
+    });
+
+    expect(response.res.statusCode).toBe(401);
+    expect(response.getBody()).toContain("Unauthorized: invalid command token.");
+  });
+
+  it("returns 408 when the request body stalls", async () => {
+    vi.useFakeTimers();
+    try {
+      const handler = createSlashCommandHttpHandler({
+        account: accountFixture,
+        cfg: {} as OpenClawConfig,
+        runtime: {} as RuntimeEnv,
+        commandTokens: new Set(["valid-token"]),
+      });
+      const req = createRequest({ autoEnd: false });
+      const response = createResponse();
+      const pending = handler(req, response.res);
+
+      await vi.advanceTimersByTimeAsync(5_000);
+      await pending;
+
+      expect(response.res.statusCode).toBe(408);
+      expect(response.getBody()).toBe("Request body timeout");
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+});

extensions/mattermost/src/mattermost/slash-http.ts

@@ -0,0 +1,546 @@
+/**
+ * HTTP callback handler for Mattermost slash commands.
+ *
+ * Receives POST requests from Mattermost when a slash command is invoked,
+ * validates the token, and routes the command through the standard inbound pipeline.
+ */
+
+import type { IncomingMessage, ServerResponse } from "node:http";
+import { safeEqualSecret } from "openclaw/plugin-sdk/browser-support";
+import type { ResolvedMattermostAccount } from "../mattermost/accounts.js";
+import { getMattermostRuntime } from "../runtime.js";
+import {
+  createMattermostClient,
+  fetchMattermostChannel,
+  normalizeMattermostBaseUrl,
+  sendMattermostTyping,
+  type MattermostChannel,
+} from "./client.js";
+import {
+  renderMattermostModelSummaryView,
+  renderMattermostModelsPickerView,
+  renderMattermostProviderPickerView,
+  resolveMattermostModelPickerCurrentModel,
+  resolveMattermostModelPickerEntry,
+} from "./model-picker.js";
+import {
+  authorizeMattermostCommandInvocation,
+  normalizeMattermostAllowList,
+} from "./monitor-auth.js";
+import { deliverMattermostReplyPayload } from "./reply-delivery.js";
+import {
+  buildModelsProviderData,
+  createChannelReplyPipeline,
+  isRequestBodyLimitError,
+  logTypingFailure,
+  readRequestBodyWithLimit,
+  type OpenClawConfig,
+  type ReplyPayload,
+  type RuntimeEnv,
+} from "./runtime-api.js";
+import { sendMessageMattermost } from "./send.js";
+import {
+  parseSlashCommandPayload,
+  resolveCommandText,
+  type MattermostSlashCommandResponse,
+} from "./slash-commands.js";
+
+type SlashHttpHandlerParams = {
+  account: ResolvedMattermostAccount;
+  cfg: OpenClawConfig;
+  runtime: RuntimeEnv;
+  /** Expected token from registered commands (for validation). */
+  commandTokens: Set<string>;
+  /** Map from trigger to original command name (for skill commands that start with oc_). */
+  triggerMap?: ReadonlyMap<string, string>;
+  log?: (msg: string) => void;
+};
+
+const MAX_BODY_BYTES = 64 * 1024;
+const BODY_READ_TIMEOUT_MS = 5_000;
+
+/**
+ * Read the full request body as a string.
+ */
+function readBody(req: IncomingMessage, maxBytes: number): Promise<string> {
+  return readRequestBodyWithLimit(req, {
+    maxBytes,
+    timeoutMs: BODY_READ_TIMEOUT_MS,
+  });
+}
+
+function sendJsonResponse(
+  res: ServerResponse,
+  status: number,
+  body: MattermostSlashCommandResponse,
+) {
+  res.statusCode = status;
+  res.setHeader("Content-Type", "application/json; charset=utf-8");
+  res.end(JSON.stringify(body));
+}
+
+function matchesRegisteredCommandToken(
+  commandTokens: ReadonlySet<string>,
+  candidate: string,
+): boolean {
+  for (const token of commandTokens) {
+    if (safeEqualSecret(candidate, token)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+type SlashInvocationAuth = {
+  ok: boolean;
+  denyResponse?: MattermostSlashCommandResponse;
+  commandAuthorized: boolean;
+  channelInfo: MattermostChannel | null;
+  kind: "direct" | "group" | "channel";
+  chatType: "direct" | "group" | "channel";
+  channelName: string;
+  channelDisplay: string;
+  roomLabel: string;
+};
+
+async function authorizeSlashInvocation(params: {
+  account: ResolvedMattermostAccount;
+  cfg: OpenClawConfig;
+  client: ReturnType<typeof createMattermostClient>;
+  commandText: string;
+  channelId: string;
+  senderId: string;
+  senderName: string;
+  log?: (msg: string) => void;
+}): Promise<SlashInvocationAuth> {
+  const { account, cfg, client, commandText, channelId, senderId, senderName, log } = params;
+  const core = getMattermostRuntime();
+
+  // Resolve channel info so we can enforce DM vs group/channel policies.
+  let channelInfo: MattermostChannel | null = null;
+  try {
+    channelInfo = await fetchMattermostChannel(client, channelId);
+  } catch (err) {
+    log?.(`mattermost: slash channel lookup failed for ${channelId}: ${String(err)}`);
+  }
+
+  if (!channelInfo) {
+    return {
+      ok: false,
+      denyResponse: {
+        response_type: "ephemeral",
+        text: "Temporary error: unable to determine channel type. Please try again.",
+      },
+      commandAuthorized: false,
+      channelInfo: null,
+      kind: "channel",
+      chatType: "channel",
+      channelName: "",
+      channelDisplay: "",
+      roomLabel: `#${channelId}`,
+    };
+  }
+
+  const allowTextCommands = core.channel.commands.shouldHandleTextCommands({
+    cfg,
+    surface: "mattermost",
+  });
+  const hasControlCommand = core.channel.text.hasControlCommand(commandText, cfg);
+  const storeAllowFrom = normalizeMattermostAllowList(
+    await core.channel.pairing
+      .readAllowFromStore({
+        channel: "mattermost",
+        accountId: account.accountId,
+      })
+      .catch(() => []),
+  );
+  const decision = authorizeMattermostCommandInvocation({
+    account,
+    cfg,
+    senderId,
+    senderName,
+    channelId,
+    channelInfo,
+    storeAllowFrom,
+    allowTextCommands,
+    hasControlCommand,
+  });
+
+  if (!decision.ok) {
+    if (decision.denyReason === "dm-pairing") {
+      const { code } = await core.channel.pairing.upsertPairingRequest({
+        channel: "mattermost",
+        accountId: account.accountId,
+        id: senderId,
+        meta: { name: senderName },
+      });
+      return {
+        ...decision,
+        denyResponse: {
+          response_type: "ephemeral",
+          text: core.channel.pairing.buildPairingReply({
+            channel: "mattermost",
+            idLine: `Your Mattermost user id: ${senderId}`,
+            code,
+          }),
+        },
+      };
+    }
+
+    const denyText =
+      decision.denyReason === "unknown-channel"
+        ? "Temporary error: unable to determine channel type. Please try again."
+        : decision.denyReason === "dm-disabled"
+          ? "This bot is not accepting direct messages."
+          : decision.denyReason === "channels-disabled"
+            ? "Slash commands are disabled in channels."
+            : decision.denyReason === "channel-no-allowlist"
+              ? "Slash commands are not configured for this channel (no allowlist)."
+              : "Unauthorized.";
+    return {
+      ...decision,
+      denyResponse: {
+        response_type: "ephemeral",
+        text: denyText,
+      },
+    };
+  }
+
+  return {
+    ...decision,
+    denyResponse: undefined,
+  };
+}
+
+/**
+ * Create the HTTP request handler for Mattermost slash command callbacks.
+ *
+ * This handler is registered as a plugin HTTP route and receives POSTs
+ * from the Mattermost server when a user invokes a registered slash command.
+ */
+export function createSlashCommandHttpHandler(params: SlashHttpHandlerParams) {
+  const { account, cfg, runtime, commandTokens, triggerMap, log } = params;
+
+  return async (req: IncomingMessage, res: ServerResponse): Promise<void> => {
+    if (req.method !== "POST") {
+      res.statusCode = 405;
+      res.setHeader("Allow", "POST");
+      res.end("Method Not Allowed");
+      return;
+    }
+
+    let body: string;
+    try {
+      body = await readBody(req, MAX_BODY_BYTES);
+    } catch (error) {
+      if (isRequestBodyLimitError(error, "REQUEST_BODY_TIMEOUT")) {
+        res.statusCode = 408;
+        res.end("Request body timeout");
+        return;
+      }
+      res.statusCode = 413;
+      res.end("Payload Too Large");
+      return;
+    }
+
+    const contentType = req.headers["content-type"] ?? "";
+    const payload = parseSlashCommandPayload(body, contentType);
+    if (!payload) {
+      sendJsonResponse(res, 400, {
+        response_type: "ephemeral",
+        text: "Invalid slash command payload.",
+      });
+      return;
+    }
+
+    // Validate token — fail closed: reject when no tokens are registered
+    // (e.g. registration failed or startup was partial)
+    if (commandTokens.size === 0 || !matchesRegisteredCommandToken(commandTokens, payload.token)) {
+      sendJsonResponse(res, 401, {
+        response_type: "ephemeral",
+        text: "Unauthorized: invalid command token.",
+      });
+      return;
+    }
+
+    // Extract command info
+    const trigger = payload.command.replace(/^\//, "").trim();
+    const commandText = resolveCommandText(trigger, payload.text, triggerMap);
+    const channelId = payload.channel_id;
+    const senderId = payload.user_id;
+    const senderName = payload.user_name ?? senderId;
+
+    const client = createMattermostClient({
+      baseUrl: account.baseUrl ?? "",
+      botToken: account.botToken ?? "",
+      allowPrivateNetwork: account.config?.allowPrivateNetwork === true,
+    });
+
+    const auth = await authorizeSlashInvocation({
+      account,
+      cfg,
+      client,
+      commandText,
+      channelId,
+      senderId,
+      senderName,
+      log,
+    });
+
+    if (!auth.ok) {
+      sendJsonResponse(
+        res,
+        200,
+        auth.denyResponse ?? { response_type: "ephemeral", text: "Unauthorized." },
+      );
+      return;
+    }
+
+    log?.(`mattermost: slash command /${trigger} from ${senderName} in ${channelId}`);
+
+    // Acknowledge immediately — we'll send the actual reply asynchronously
+    sendJsonResponse(res, 200, {
+      response_type: "ephemeral",
+      text: "Processing...",
+    });
+
+    // Now handle the command asynchronously (post reply as a message)
+    try {
+      await handleSlashCommandAsync({
+        account,
+        cfg,
+        runtime,
+        client,
+        commandText,
+        channelId,
+        senderId,
+        senderName,
+        teamId: payload.team_id,
+        triggerId: payload.trigger_id,
+        kind: auth.kind,
+        chatType: auth.chatType,
+        channelName: auth.channelName,
+        channelDisplay: auth.channelDisplay,
+        roomLabel: auth.roomLabel,
+        commandAuthorized: auth.commandAuthorized,
+        log,
+      });
+    } catch (err) {
+      log?.(`mattermost: slash command handler error: ${String(err)}`);
+      try {
+        const to = `channel:${channelId}`;
+        await sendMessageMattermost(to, "Sorry, something went wrong processing that command.", {
+          cfg,
+          accountId: account.accountId,
+        });
+      } catch {
+        // best-effort error reply
+      }
+    }
+  };
+}
+
+async function handleSlashCommandAsync(params: {
+  account: ResolvedMattermostAccount;
+  cfg: OpenClawConfig;
+  runtime: RuntimeEnv;
+  client: ReturnType<typeof createMattermostClient>;
+  commandText: string;
+  channelId: string;
+  senderId: string;
+  senderName: string;
+  teamId: string;
+  kind: "direct" | "group" | "channel";
+  chatType: "direct" | "group" | "channel";
+  channelName: string;
+  channelDisplay: string;
+  roomLabel: string;
+  commandAuthorized: boolean;
+  triggerId?: string;
+  log?: (msg: string) => void;
+}) {
+  const {
+    account,
+    cfg,
+    runtime,
+    client,
+    commandText,
+    channelId,
+    senderId,
+    senderName,
+    teamId,
+    kind,
+    chatType,
+    channelName,
+    channelDisplay,
+    roomLabel,
+    commandAuthorized,
+    triggerId,
+    log,
+  } = params;
+  const core = getMattermostRuntime();
+
+  const route = core.channel.routing.resolveAgentRoute({
+    cfg,
+    channel: "mattermost",
+    accountId: account.accountId,
+    teamId,
+    peer: {
+      kind,
+      id: kind === "direct" ? senderId : channelId,
+    },
+  });
+
+  const fromLabel =
+    kind === "direct"
+      ? `Mattermost DM from ${senderName}`
+      : `Mattermost message in ${roomLabel} from ${senderName}`;
+
+  const to = kind === "direct" ? `user:${senderId}` : `channel:${channelId}`;
+  const pickerEntry = resolveMattermostModelPickerEntry(commandText);
+  if (pickerEntry) {
+    const data = await buildModelsProviderData(cfg, route.agentId);
+    if (data.providers.length === 0) {
+      await sendMessageMattermost(to, "No models available.", {
+        cfg,
+        accountId: account.accountId,
+      });
+      return;
+    }
+
+    const currentModel = resolveMattermostModelPickerCurrentModel({
+      cfg,
+      route,
+      data,
+    });
+    const view =
+      pickerEntry.kind === "summary"
+        ? renderMattermostModelSummaryView({
+            ownerUserId: senderId,
+            currentModel,
+          })
+        : pickerEntry.kind === "providers"
+          ? renderMattermostProviderPickerView({
+              ownerUserId: senderId,
+              data,
+              currentModel,
+            })
+          : renderMattermostModelsPickerView({
+              ownerUserId: senderId,
+              data,
+              provider: pickerEntry.provider,
+              page: 1,
+              currentModel,
+            });
+
+    await sendMessageMattermost(to, view.text, {
+      cfg,
+      accountId: account.accountId,
+      buttons: view.buttons,
+    });
+    runtime.log?.(`delivered model picker to ${to}`);
+    return;
+  }
+
+  // Build inbound context — the command text is the body
+  const ctxPayload = core.channel.reply.finalizeInboundContext({
+    Body: commandText,
+    BodyForAgent: commandText,
+    RawBody: commandText,
+    CommandBody: commandText,
+    From:
+      kind === "direct"
+        ? `mattermost:${senderId}`
+        : kind === "group"
+          ? `mattermost:group:${channelId}`
+          : `mattermost:channel:${channelId}`,
+    To: to,
+    SessionKey: route.sessionKey,
+    AccountId: route.accountId,
+    ChatType: chatType,
+    ConversationLabel: fromLabel,
+    GroupSubject: kind !== "direct" ? channelDisplay || roomLabel : undefined,
+    SenderName: senderName,
+    SenderId: senderId,
+    Provider: "mattermost" as const,
+    Surface: "mattermost" as const,
+    MessageSid: triggerId ?? `slash-${Date.now()}`,
+    Timestamp: Date.now(),
+    WasMentioned: true,
+    CommandAuthorized: commandAuthorized,
+    CommandSource: "native" as const,
+    OriginatingChannel: "mattermost" as const,
+    OriginatingTo: to,
+  });
+
+  const textLimit = core.channel.text.resolveTextChunkLimit(cfg, "mattermost", account.accountId, {
+    fallbackLimit: account.textChunkLimit ?? 4000,
+  });
+  const tableMode = core.channel.text.resolveMarkdownTableMode({
+    cfg,
+    channel: "mattermost",
+    accountId: account.accountId,
+  });
+
+  const { onModelSelected, typingCallbacks, ...replyPipeline } = createChannelReplyPipeline({
+    cfg,
+    agentId: route.agentId,
+    channel: "mattermost",
+    accountId: account.accountId,
+    typing: {
+      start: () => sendMattermostTyping(client, { channelId }),
+      onStartError: (err) => {
+        logTypingFailure({
+          log: (message) => log?.(message),
+          channel: "mattermost",
+          target: channelId,
+          error: err,
+        });
+      },
+    },
+  });
+  const humanDelay = core.channel.reply.resolveHumanDelayConfig(cfg, route.agentId);
+
+  const { dispatcher, replyOptions, markDispatchIdle } =
+    core.channel.reply.createReplyDispatcherWithTyping({
+      ...replyPipeline,
+      humanDelay,
+      deliver: async (payload: ReplyPayload) => {
+        await deliverMattermostReplyPayload({
+          core,
+          cfg,
+          payload,
+          to,
+          accountId: account.accountId,
+          agentId: route.agentId,
+          textLimit,
+          tableMode,
+          sendMessage: sendMessageMattermost,
+        });
+        runtime.log?.(`delivered slash reply to ${to}`);
+      },
+      onError: (err, info) => {
+        runtime.error?.(`mattermost slash ${info.kind} reply failed: ${String(err)}`);
+      },
+      onReplyStart: typingCallbacks?.onReplyStart,
+    });
+
+  await core.channel.reply.withReplyDispatcher({
+    dispatcher,
+    onSettled: () => {
+      markDispatchIdle();
+    },
+    run: () =>
+      core.channel.reply.dispatchReplyFromConfig({
+        ctx: ctxPayload,
+        cfg,
+        dispatcher,
+        replyOptions: {
+          ...replyOptions,
+          disableBlockStreaming:
+            typeof account.blockStreaming === "boolean" ? !account.blockStreaming : undefined,
+          onModelSelected,
+        },
+      }),
+  });
+}

extensions/mattermost/src/mattermost/slash-state.test.ts

@@ -0,0 +1,66 @@
+import { describe, expect, it } from "vitest";
+import type { OpenClawConfig, RuntimeEnv } from "../runtime-api.js";
+import type { ResolvedMattermostAccount } from "./accounts.js";
+import {
+  activateSlashCommands,
+  deactivateSlashCommands,
+  resolveSlashHandlerForToken,
+} from "./slash-state.js";
+
+function createResolvedMattermostAccount(accountId: string): ResolvedMattermostAccount {
+  return {
+    accountId,
+    enabled: true,
+    botTokenSource: "config",
+    baseUrlSource: "config",
+    config: {},
+  };
+}
+
+const slashApi = {
+  cfg: {},
+  runtime: {
+    log: () => {},
+    error: () => {},
+    exit: () => {},
+  },
+} satisfies {
+  cfg: OpenClawConfig;
+  runtime: RuntimeEnv;
+};
+
+describe("slash-state token routing", () => {
+  it("returns single match when token belongs to one account", () => {
+    deactivateSlashCommands();
+    activateSlashCommands({
+      account: createResolvedMattermostAccount("a1"),
+      commandTokens: ["tok-a"],
+      registeredCommands: [],
+      api: slashApi,
+    });
+
+    const match = resolveSlashHandlerForToken("tok-a");
+    expect(match.kind).toBe("single");
+    expect(match.accountIds).toEqual(["a1"]);
+  });
+
+  it("returns ambiguous when same token exists in multiple accounts", () => {
+    deactivateSlashCommands();
+    activateSlashCommands({
+      account: createResolvedMattermostAccount("a1"),
+      commandTokens: ["tok-shared"],
+      registeredCommands: [],
+      api: slashApi,
+    });
+    activateSlashCommands({
+      account: createResolvedMattermostAccount("a2"),
+      commandTokens: ["tok-shared"],
+      registeredCommands: [],
+      api: slashApi,
+    });
+
+    const match = resolveSlashHandlerForToken("tok-shared");
+    expect(match.kind).toBe("ambiguous");
+    expect(match.accountIds?.sort()).toEqual(["a1", "a2"]);
+  });
+});

extensions/mattermost/src/mattermost/slash-state.ts

@@ -0,0 +1,311 @@
+/**
+ * Shared state for Mattermost slash commands.
+ *
+ * Bridges the plugin registration phase (HTTP route) with the monitor phase
+ * (command registration with MM API). The HTTP handler needs to know which
+ * tokens are valid, and the monitor needs to store registered command IDs.
+ *
+ * State is kept per-account so that multi-account deployments don't
+ * overwrite each other's tokens, registered commands, or handlers.
+ */
+
+import type { IncomingMessage, ServerResponse } from "node:http";
+import type { MattermostConfig } from "../types.js";
+import type { ResolvedMattermostAccount } from "./accounts.js";
+import type { OpenClawPluginApi } from "./runtime-api.js";
+import { resolveSlashCommandConfig, type MattermostRegisteredCommand } from "./slash-commands.js";
+import { createSlashCommandHttpHandler } from "./slash-http.js";
+
+// ─── Per-account state ───────────────────────────────────────────────────────
+
+export type SlashCommandAccountState = {
+  /** Tokens from registered commands, used for validation. */
+  commandTokens: Set<string>;
+  /** Registered command IDs for cleanup on shutdown. */
+  registeredCommands: MattermostRegisteredCommand[];
+  /** Current HTTP handler for this account. */
+  handler: ((req: IncomingMessage, res: ServerResponse) => Promise<void>) | null;
+  /** The account that activated slash commands. */
+  account: ResolvedMattermostAccount;
+  /** Map from trigger to original command name (for skill commands that start with oc_). */
+  triggerMap: Map<string, string>;
+};
+
+/** Map from accountId → per-account slash command state. */
+const accountStates = new Map<string, SlashCommandAccountState>();
+
+export function resolveSlashHandlerForToken(token: string): {
+  kind: "none" | "single" | "ambiguous";
+  handler?: (req: IncomingMessage, res: ServerResponse) => Promise<void>;
+  accountIds?: string[];
+} {
+  const matches: Array<{
+    accountId: string;
+    handler: (req: IncomingMessage, res: ServerResponse) => Promise<void>;
+  }> = [];
+
+  for (const [accountId, state] of accountStates) {
+    if (state.commandTokens.has(token) && state.handler) {
+      matches.push({ accountId, handler: state.handler });
+    }
+  }
+
+  if (matches.length === 0) {
+    return { kind: "none" };
+  }
+  if (matches.length === 1) {
+    return { kind: "single", handler: matches[0]!.handler, accountIds: [matches[0]!.accountId] };
+  }
+
+  return {
+    kind: "ambiguous",
+    accountIds: matches.map((entry) => entry.accountId),
+  };
+}
+
+/**
+ * Get the slash command state for a specific account, or null if not activated.
+ */
+export function getSlashCommandState(accountId: string): SlashCommandAccountState | null {
+  return accountStates.get(accountId) ?? null;
+}
+
+/**
+ * Get all active slash command account states.
+ */
+export function getAllSlashCommandStates(): ReadonlyMap<string, SlashCommandAccountState> {
+  return accountStates;
+}
+
+/**
+ * Activate slash commands for a specific account.
+ * Called from the monitor after bot connects.
+ */
+export function activateSlashCommands(params: {
+  account: ResolvedMattermostAccount;
+  commandTokens: string[];
+  registeredCommands: MattermostRegisteredCommand[];
+  triggerMap?: Map<string, string>;
+  api: {
+    cfg: import("./runtime-api.js").OpenClawConfig;
+    runtime: import("./runtime-api.js").RuntimeEnv;
+  };
+  log?: (msg: string) => void;
+}) {
+  const { account, commandTokens, registeredCommands, triggerMap, api, log } = params;
+  const accountId = account.accountId;
+
+  const tokenSet = new Set(commandTokens);
+
+  const handler = createSlashCommandHttpHandler({
+    account,
+    cfg: api.cfg,
+    runtime: api.runtime,
+    commandTokens: tokenSet,
+    triggerMap,
+    log,
+  });
+
+  accountStates.set(accountId, {
+    commandTokens: tokenSet,
+    registeredCommands,
+    handler,
+    account,
+    triggerMap: triggerMap ?? new Map(),
+  });
+
+  log?.(
+    `mattermost: slash commands activated for account ${accountId} (${registeredCommands.length} commands)`,
+  );
+}
+
+/**
+ * Deactivate slash commands for a specific account (on shutdown/disconnect).
+ */
+export function deactivateSlashCommands(accountId?: string) {
+  if (accountId) {
+    const state = accountStates.get(accountId);
+    if (state) {
+      state.commandTokens.clear();
+      state.registeredCommands = [];
+      state.handler = null;
+      accountStates.delete(accountId);
+    }
+  } else {
+    // Deactivate all accounts (full shutdown)
+    for (const [, state] of accountStates) {
+      state.commandTokens.clear();
+      state.registeredCommands = [];
+      state.handler = null;
+    }
+    accountStates.clear();
+  }
+}
+
+/**
+ * Register the HTTP route for slash command callbacks.
+ * Called during plugin registration.
+ *
+ * The single HTTP route dispatches to the correct per-account handler
+ * by matching the inbound token against each account's registered tokens.
+ */
+export function registerSlashCommandRoute(api: OpenClawPluginApi) {
+  const mmConfig = api.config.channels?.mattermost as MattermostConfig | undefined;
+
+  // Collect callback paths from both top-level and per-account config.
+  // Command registration uses account.config.commands, so the HTTP route
+  // registration must include any account-specific callbackPath overrides.
+  // Also extract the pathname from an explicit callbackUrl when it differs
+  // from callbackPath, so that Mattermost callbacks hit a registered route.
+  const callbackPaths = new Set<string>();
+
+  const addCallbackPaths = (
+    raw: Partial<import("./slash-commands.js").MattermostSlashCommandConfig> | undefined,
+  ) => {
+    const resolved = resolveSlashCommandConfig(raw);
+    callbackPaths.add(resolved.callbackPath);
+    if (resolved.callbackUrl) {
+      try {
+        const urlPath = new URL(resolved.callbackUrl).pathname;
+        if (urlPath && urlPath !== resolved.callbackPath) {
+          callbackPaths.add(urlPath);
+        }
+      } catch {
+        // Invalid URL — ignore, will be caught during registration
+      }
+    }
+  };
+
+  const commandsRaw = mmConfig?.commands as
+    | Partial<import("./slash-commands.js").MattermostSlashCommandConfig>
+    | undefined;
+  addCallbackPaths(commandsRaw);
+
+  const accountsRaw = mmConfig?.accounts ?? {};
+  for (const accountId of Object.keys(accountsRaw)) {
+    const accountCommandsRaw = accountsRaw[accountId]?.commands;
+    addCallbackPaths(accountCommandsRaw);
+  }
+
+  const routeHandler = async (req: IncomingMessage, res: ServerResponse) => {
+    if (accountStates.size === 0) {
+      res.statusCode = 503;
+      res.setHeader("Content-Type", "application/json; charset=utf-8");
+      res.end(
+        JSON.stringify({
+          response_type: "ephemeral",
+          text: "Slash commands are not yet initialized. Please try again in a moment.",
+        }),
+      );
+      return;
+    }
+
+    // We need to peek at the token to route to the right account handler.
+    // Since each account handler also validates the token, we find the
+    // account whose token set contains the inbound token and delegate.
+
+    // If there's only one active account (common case), route directly.
+    if (accountStates.size === 1) {
+      const [, state] = [...accountStates.entries()][0]!;
+      if (!state.handler) {
+        res.statusCode = 503;
+        res.setHeader("Content-Type", "application/json; charset=utf-8");
+        res.end(
+          JSON.stringify({
+            response_type: "ephemeral",
+            text: "Slash commands are not yet initialized. Please try again in a moment.",
+          }),
+        );
+        return;
+      }
+      await state.handler(req, res);
+      return;
+    }
+
+    // Multi-account: buffer the body, find the matching account by token,
+    // then replay the request to the correct handler.
+    const chunks: Buffer[] = [];
+    const MAX_BODY = 64 * 1024;
+    let size = 0;
+    for await (const chunk of req) {
+      size += (chunk as Buffer).length;
+      if (size > MAX_BODY) {
+        res.statusCode = 413;
+        res.end("Payload Too Large");
+        return;
+      }
+      chunks.push(chunk as Buffer);
+    }
+    const bodyStr = Buffer.concat(chunks).toString("utf8");
+
+    // Parse just the token to find the right account
+    let token: string | null = null;
+    const ct = req.headers["content-type"] ?? "";
+    try {
+      if (ct.includes("application/json")) {
+        token = (JSON.parse(bodyStr) as { token?: string }).token ?? null;
+      } else {
+        token = new URLSearchParams(bodyStr).get("token");
+      }
+    } catch {
+      // parse failed — will be caught by handler
+    }
+
+    const match = token ? resolveSlashHandlerForToken(token) : { kind: "none" as const };
+
+    if (match.kind === "none") {
+      // No matching account — reject
+      res.statusCode = 401;
+      res.setHeader("Content-Type", "application/json; charset=utf-8");
+      res.end(
+        JSON.stringify({
+          response_type: "ephemeral",
+          text: "Unauthorized: invalid command token.",
+        }),
+      );
+      return;
+    }
+
+    if (match.kind === "ambiguous") {
+      api.logger.warn?.(
+        `mattermost: slash callback token matched multiple accounts (${match.accountIds?.join(", ")})`,
+      );
+      res.statusCode = 409;
+      res.setHeader("Content-Type", "application/json; charset=utf-8");
+      res.end(
+        JSON.stringify({
+          response_type: "ephemeral",
+          text: "Conflict: command token is not unique across accounts.",
+        }),
+      );
+      return;
+    }
+
+    const matchedHandler = match.handler!;
+
+    // Replay: create a synthetic readable that re-emits the buffered body
+    const { Readable } = await import("node:stream");
+    const syntheticReq = new Readable({
+      read() {
+        this.push(Buffer.from(bodyStr, "utf8"));
+        this.push(null);
+      },
+    }) as IncomingMessage;
+
+    // Copy necessary IncomingMessage properties
+    syntheticReq.method = req.method;
+    syntheticReq.url = req.url;
+    syntheticReq.headers = req.headers;
+
+    await matchedHandler(syntheticReq, res);
+  };
+
+  for (const callbackPath of callbackPaths) {
+    api.registerHttpRoute({
+      path: callbackPath,
+      auth: "plugin",
+      handler: routeHandler,
+    });
+    api.logger.info?.(`mattermost: registered slash command callback at ${callbackPath}`);
+  }
+}

extensions/mattermost/src/mattermost/target-resolution.test.ts

@@ -0,0 +1,128 @@
+import { afterEach, beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+
+const resolveMattermostAccount = vi.fn();
+const createMattermostClient = vi.fn();
+const fetchMattermostUser = vi.fn();
+const normalizeMattermostBaseUrl = vi.fn((value: string | undefined) => value?.trim());
+
+vi.mock("./accounts.js", () => ({
+  resolveMattermostAccount,
+}));
+
+vi.mock("./client.js", () => ({
+  createMattermostClient,
+  fetchMattermostUser,
+  normalizeMattermostBaseUrl,
+}));
+
+describe("mattermost target resolution", () => {
+  let isExplicitMattermostTarget: typeof import("./target-resolution.js").isExplicitMattermostTarget;
+  let isMattermostId: typeof import("./target-resolution.js").isMattermostId;
+  let parseMattermostApiStatus: typeof import("./target-resolution.js").parseMattermostApiStatus;
+  let resolveMattermostOpaqueTarget: typeof import("./target-resolution.js").resolveMattermostOpaqueTarget;
+  let resetMattermostOpaqueTargetCacheForTests: typeof import("./target-resolution.js").resetMattermostOpaqueTargetCacheForTests;
+
+  beforeAll(async () => {
+    ({
+      isExplicitMattermostTarget,
+      isMattermostId,
+      parseMattermostApiStatus,
+      resolveMattermostOpaqueTarget,
+      resetMattermostOpaqueTargetCacheForTests,
+    } = await import("./target-resolution.js"));
+  });
+
+  beforeEach(() => {
+    resolveMattermostAccount.mockReset();
+    createMattermostClient.mockReset();
+    fetchMattermostUser.mockReset();
+    normalizeMattermostBaseUrl.mockClear();
+  });
+
+  afterEach(() => {
+    resetMattermostOpaqueTargetCacheForTests();
+  });
+
+  it("recognizes explicit targets and ID-shaped values", () => {
+    expect(isExplicitMattermostTarget("@alice")).toBe(true);
+    expect(isExplicitMattermostTarget("#town-square")).toBe(true);
+    expect(isExplicitMattermostTarget("mattermost:chan")).toBe(true);
+    expect(isExplicitMattermostTarget(" plain ")).toBe(false);
+    expect(isMattermostId("abcd1234abcd1234abcd1234ab")).toBe(true);
+    expect(isMattermostId("short")).toBe(false);
+    expect(parseMattermostApiStatus(new Error("Mattermost API 404 Not Found"))).toBe(404);
+    expect(parseMattermostApiStatus(new Error("other error"))).toBeUndefined();
+  });
+
+  it("resolves opaque ids as users and caches the result", async () => {
+    createMattermostClient.mockReturnValue({ client: true });
+    fetchMattermostUser.mockResolvedValue({ id: "abcd1234abcd1234abcd1234ab" });
+    const input = "abcd1234abcd1234abcd1234ab";
+
+    await expect(
+      resolveMattermostOpaqueTarget({
+        input,
+        token: "token",
+        baseUrl: "https://mm.example.com",
+      }),
+    ).resolves.toEqual({
+      kind: "user",
+      id: input,
+      to: `user:${input}`,
+    });
+
+    await expect(
+      resolveMattermostOpaqueTarget({
+        input,
+        token: "token",
+        baseUrl: "https://mm.example.com",
+      }),
+    ).resolves.toEqual({
+      kind: "user",
+      id: input,
+      to: `user:${input}`,
+    });
+
+    expect(createMattermostClient).toHaveBeenCalledTimes(1);
+    expect(fetchMattermostUser).toHaveBeenCalledTimes(1);
+  });
+
+  it("falls back to channel targets on 404 lookups", async () => {
+    createMattermostClient.mockReturnValue({ client: true });
+    fetchMattermostUser.mockRejectedValue(new Error("Mattermost API 404 Not Found"));
+    const input = "bcde1234abcd1234abcd1234ab";
+
+    await expect(
+      resolveMattermostOpaqueTarget({
+        input,
+        token: "token",
+        baseUrl: "https://mm.example.com",
+      }),
+    ).resolves.toEqual({
+      kind: "channel",
+      id: input,
+      to: `channel:${input}`,
+    });
+  });
+
+  it("uses account resolution when token/base url are not passed", async () => {
+    resolveMattermostAccount.mockReturnValue({
+      baseUrl: "https://mm.example.com",
+      botToken: "token",
+    });
+    createMattermostClient.mockReturnValue({ client: true });
+    fetchMattermostUser.mockResolvedValue({ id: "cdef1234abcd1234abcd1234ab" });
+    const input = "cdef1234abcd1234abcd1234ab";
+
+    await resolveMattermostOpaqueTarget({
+      input,
+      cfg: { channels: { mattermost: {} } },
+      accountId: "acct-1",
+    });
+
+    expect(resolveMattermostAccount).toHaveBeenCalledWith({
+      cfg: { channels: { mattermost: {} } },
+      accountId: "acct-1",
+    });
+  });
+});

extensions/mattermost/src/mattermost/target-resolution.ts

@@ -0,0 +1,101 @@
+import { resolveMattermostAccount } from "./accounts.js";
+import {
+  createMattermostClient,
+  fetchMattermostUser,
+  normalizeMattermostBaseUrl,
+} from "./client.js";
+import type { OpenClawConfig } from "./runtime-api.js";
+
+export type MattermostOpaqueTargetResolution = {
+  kind: "user" | "channel";
+  id: string;
+  to: string;
+};
+
+const mattermostOpaqueTargetCache = new Map<string, boolean>();
+
+function cacheKey(baseUrl: string, token: string, id: string): string {
+  return `${baseUrl}::${token}::${id}`;
+}
+
+/** Mattermost IDs are 26-character lowercase alphanumeric strings. */
+export function isMattermostId(value: string): boolean {
+  return /^[a-z0-9]{26}$/.test(value);
+}
+
+export function isExplicitMattermostTarget(raw: string): boolean {
+  const trimmed = raw.trim();
+  if (!trimmed) {
+    return false;
+  }
+  return (
+    /^(channel|user|mattermost):/i.test(trimmed) ||
+    trimmed.startsWith("@") ||
+    trimmed.startsWith("#")
+  );
+}
+
+export function parseMattermostApiStatus(err: unknown): number | undefined {
+  if (!err || typeof err !== "object") {
+    return undefined;
+  }
+  const msg = "message" in err ? String((err as { message?: unknown }).message ?? "") : "";
+  const match = /Mattermost API (\d{3})\b/.exec(msg);
+  if (!match) {
+    return undefined;
+  }
+  const code = Number(match[1]);
+  return Number.isFinite(code) ? code : undefined;
+}
+
+export async function resolveMattermostOpaqueTarget(params: {
+  input: string;
+  cfg?: OpenClawConfig;
+  accountId?: string | null;
+  token?: string;
+  baseUrl?: string;
+}): Promise<MattermostOpaqueTargetResolution | null> {
+  const input = params.input.trim();
+  if (!input || isExplicitMattermostTarget(input) || !isMattermostId(input)) {
+    return null;
+  }
+
+  const account =
+    params.cfg && (!params.token || !params.baseUrl)
+      ? resolveMattermostAccount({ cfg: params.cfg, accountId: params.accountId })
+      : null;
+  const token = params.token?.trim() || account?.botToken?.trim();
+  const baseUrl = normalizeMattermostBaseUrl(params.baseUrl ?? account?.baseUrl);
+  if (!token || !baseUrl) {
+    return null;
+  }
+
+  const key = cacheKey(baseUrl, token, input);
+  const cached = mattermostOpaqueTargetCache.get(key);
+  if (cached === true) {
+    return { kind: "user", id: input, to: `user:${input}` };
+  }
+  if (cached === false) {
+    return { kind: "channel", id: input, to: `channel:${input}` };
+  }
+
+  const client = createMattermostClient({
+    baseUrl,
+    botToken: token,
+    allowPrivateNetwork: account?.config?.allowPrivateNetwork === true,
+  });
+  try {
+    await fetchMattermostUser(client, input);
+    mattermostOpaqueTargetCache.set(key, true);
+    return { kind: "user", id: input, to: `user:${input}` };
+  } catch (err) {
+    if (parseMattermostApiStatus(err) === 404) {
+      mattermostOpaqueTargetCache.set(key, false);
+    }
+    return { kind: "channel", id: input, to: `channel:${input}` };
+  }
+}
+
+export function resetMattermostOpaqueTargetCacheForTests(): void {
+  mattermostOpaqueTargetCache.clear();
+}

extensions/mattermost/src/normalize.test.ts

@@ -0,0 +1,96 @@
+import { describe, expect, it } from "vitest";
+import { looksLikeMattermostTargetId, normalizeMattermostMessagingTarget } from "./normalize.js";
+
+describe("normalizeMattermostMessagingTarget", () => {
+  it("returns undefined for empty input", () => {
+    expect(normalizeMattermostMessagingTarget("")).toBeUndefined();
+    expect(normalizeMattermostMessagingTarget("  ")).toBeUndefined();
+  });
+
+  it("normalizes channel: prefix", () => {
+    expect(normalizeMattermostMessagingTarget("channel:abc123")).toBe("channel:abc123");
+    expect(normalizeMattermostMessagingTarget("Channel:ABC")).toBe("channel:ABC");
+  });
+
+  it("normalizes group: prefix to channel:", () => {
+    expect(normalizeMattermostMessagingTarget("group:abc123")).toBe("channel:abc123");
+  });
+
+  it("normalizes user: prefix", () => {
+    expect(normalizeMattermostMessagingTarget("user:abc123")).toBe("user:abc123");
+  });
+
+  it("normalizes mattermost: prefix to user:", () => {
+    expect(normalizeMattermostMessagingTarget("mattermost:abc123")).toBe("user:abc123");
+  });
+
+  it("keeps @username targets", () => {
+    expect(normalizeMattermostMessagingTarget("@alice")).toBe("@alice");
+    expect(normalizeMattermostMessagingTarget("@Alice")).toBe("@Alice");
+  });
+
+  it("returns undefined for #channel (triggers directory lookup)", () => {
+    expect(normalizeMattermostMessagingTarget("#bookmarks")).toBeUndefined();
+    expect(normalizeMattermostMessagingTarget("#off-topic")).toBeUndefined();
+    expect(normalizeMattermostMessagingTarget("# ")).toBeUndefined();
+  });
+
+  it("returns undefined for bare names (triggers directory lookup)", () => {
+    expect(normalizeMattermostMessagingTarget("bookmarks")).toBeUndefined();
+    expect(normalizeMattermostMessagingTarget("off-topic")).toBeUndefined();
+  });
+
+  it("returns undefined for empty prefixed values", () => {
+    expect(normalizeMattermostMessagingTarget("channel:")).toBeUndefined();
+    expect(normalizeMattermostMessagingTarget("user:")).toBeUndefined();
+    expect(normalizeMattermostMessagingTarget("@")).toBeUndefined();
+    expect(normalizeMattermostMessagingTarget("#")).toBeUndefined();
+  });
+});
+
+describe("looksLikeMattermostTargetId", () => {
+  it("returns false for empty input", () => {
+    expect(looksLikeMattermostTargetId("")).toBe(false);
+    expect(looksLikeMattermostTargetId("  ")).toBe(false);
+  });
+
+  it("recognizes prefixed targets", () => {
+    expect(looksLikeMattermostTargetId("channel:abc")).toBe(true);
+    expect(looksLikeMattermostTargetId("Channel:abc")).toBe(true);
+    expect(looksLikeMattermostTargetId("user:abc")).toBe(true);
+    expect(looksLikeMattermostTargetId("group:abc")).toBe(true);
+    expect(looksLikeMattermostTargetId("mattermost:abc")).toBe(true);
+  });
+
+  it("recognizes @username", () => {
+    expect(looksLikeMattermostTargetId("@alice")).toBe(true);
+  });
+
+  it("does NOT recognize #channel (should go to directory)", () => {
+    expect(looksLikeMattermostTargetId("#bookmarks")).toBe(false);
+    expect(looksLikeMattermostTargetId("#off-topic")).toBe(false);
+  });
+
+  it("recognizes 26-char alphanumeric Mattermost IDs", () => {
+    expect(looksLikeMattermostTargetId("abcdefghijklmnopqrstuvwxyz")).toBe(true);
+    expect(looksLikeMattermostTargetId("12345678901234567890123456")).toBe(true);
+    expect(looksLikeMattermostTargetId("AbCdEf1234567890abcdef1234")).toBe(true); // pragma: allowlist secret
+  });
+
+  it("recognizes DM channel format (26__26)", () => {
+    expect(
+      looksLikeMattermostTargetId("abcdefghijklmnopqrstuvwxyz__12345678901234567890123456"), // pragma: allowlist secret
+    ).toBe(true);
+  });
+
+  it("rejects short strings that are not Mattermost IDs", () => {
+    expect(looksLikeMattermostTargetId("password")).toBe(false);
+    expect(looksLikeMattermostTargetId("hi")).toBe(false);
+    expect(looksLikeMattermostTargetId("bookmarks")).toBe(false);
+    expect(looksLikeMattermostTargetId("off-topic")).toBe(false);
+  });
+
+  it("rejects strings longer than 26 chars that are not DM format", () => {
+    expect(looksLikeMattermostTargetId("abcdefghijklmnopqrstuvwxyz1")).toBe(false); // pragma: allowlist secret
+  });
+});

extensions/mattermost/src/normalize.ts

@@ -0,0 +1,50 @@
+export function normalizeMattermostMessagingTarget(raw: string): string | undefined {
+  const trimmed = raw.trim();
+  if (!trimmed) {
+    return undefined;
+  }
+  const lower = trimmed.toLowerCase();
+  if (lower.startsWith("channel:")) {
+    const id = trimmed.slice("channel:".length).trim();
+    return id ? `channel:${id}` : undefined;
+  }
+  if (lower.startsWith("group:")) {
+    const id = trimmed.slice("group:".length).trim();
+    return id ? `channel:${id}` : undefined;
+  }
+  if (lower.startsWith("user:")) {
+    const id = trimmed.slice("user:".length).trim();
+    return id ? `user:${id}` : undefined;
+  }
+  if (lower.startsWith("mattermost:")) {
+    const id = trimmed.slice("mattermost:".length).trim();
+    return id ? `user:${id}` : undefined;
+  }
+  if (trimmed.startsWith("@")) {
+    const id = trimmed.slice(1).trim();
+    return id ? `@${id}` : undefined;
+  }
+  if (trimmed.startsWith("#")) {
+    // Strip # prefix and fall through to directory lookup (same as bare names).
+    // The core's resolveMessagingTarget will use the directory adapter to
+    // resolve the channel name to its Mattermost ID.
+    return undefined;
+  }
+  // Bare name without prefix — return undefined to allow directory lookup
+  return undefined;
+}
+
+export function looksLikeMattermostTargetId(raw: string, normalized?: string): boolean {
+  const trimmed = raw.trim();
+  if (!trimmed) {
+    return false;
+  }
+  if (/^(user|channel|group|mattermost):/i.test(trimmed)) {
+    return true;
+  }
+  if (trimmed.startsWith("@")) {
+    return true;
+  }
+  // Mattermost IDs: 26-char alnum, or DM channels like "abc123__xyz789" (53 chars)
+  return /^[a-z0-9]{26}$/i.test(trimmed) || /^[a-z0-9]{26}__[a-z0-9]{26}$/i.test(trimmed);
+}

extensions/mattermost/src/plugin-sdk/account-helpers.ts

@@ -0,0 +1,14 @@
+export function createAccountListHelpers(channelId: string) {
+  return {
+    listAccountIds: (cfg: any) => {
+      const accounts = cfg?.channels?.[channelId]?.accounts;
+      if (accounts && typeof accounts === "object") {
+        return Object.keys(accounts);
+      }
+      return ["default"];
+    },
+    resolveDefaultAccountId: (cfg: any) => {
+      return "default";
+    },
+  };
+}

extensions/mattermost/src/plugin-sdk/account-id.ts

@@ -0,0 +1,5 @@
+export const DEFAULT_ACCOUNT_ID = "default";
+
+export function normalizeAccountId(id: string): string {
+  return id || "default";
+}

extensions/mattermost/src/plugin-sdk/account-resolution.ts

@@ -0,0 +1,14 @@
+export function resolveMergedAccountConfig<T>(params: {
+  channelConfig?: Record<string, unknown>;
+  accounts?: Record<string, Record<string, unknown>>;
+  accountId: string;
+  omitKeys?: string[];
+  nestedObjectKeys?: string[];
+}): T {
+  const { channelConfig = {}, accounts = {}, accountId } = params;
+  const accountConfig = accounts[accountId] || {};
+  return {
+    ...channelConfig,
+    ...accountConfig,
+  } as T;
+}

extensions/mattermost/src/plugin-sdk/approval-auth-runtime.ts

@@ -0,0 +1,7 @@
+export function createResolvedApproverActionAuthAdapter() {
+  return {};
+}
+
+export function resolveApprovalApprovers() {
+  return [];
+}

extensions/mattermost/src/plugin-sdk/channel-policy.ts

@@ -0,0 +1,3 @@
+export function resolveChannelGroupRequireMention() {
+  return false;
+}

extensions/mattermost/src/plugin-sdk/config-runtime.ts

@@ -0,0 +1,39 @@
+export interface OpenClawConfig {
+  channels?: {
+    mattermost?: {
+      enabled?: boolean;
+      botToken?: string;
+      baseUrl?: string;
+      accounts?: Record<string, Record<string, unknown>>;
+      [key: string]: unknown;
+    };
+  };
+  commands?: {
+    useAccessGroups?: boolean;
+    native?: boolean | "auto";
+    nativeSkills?: boolean | "auto";
+  };
+  [key: string]: unknown;
+}
+
+export function resolveNativeCommandsEnabled(params: {
+  providerId: string;
+  providerSetting?: boolean | "auto";
+  globalSetting?: boolean | "auto";
+}): boolean {
+  if (params.providerSetting === true) return true;
+  if (params.providerSetting === false) return false;
+  if (params.globalSetting === true) return true;
+  return false;
+}
+
+export function resolveNativeSkillsEnabled(params: {
+  providerId: string;
+  providerSetting?: boolean | "auto";
+  globalSetting?: boolean | "auto";
+}): boolean {
+  if (params.providerSetting === true) return true;
+  if (params.providerSetting === false) return false;
+  if (params.globalSetting === true) return true;
+  return false;
+}

extensions/mattermost/src/plugin-sdk/conversation-runtime.ts

@@ -0,0 +1,7 @@
+export async function readChannelAllowFromStore(
+  channelId: string,
+  env: Record<string, string | undefined>,
+  accountId?: string
+): Promise<string[]> {
+  return [];
+}

extensions/mattermost/src/plugin-sdk/core.ts

@@ -0,0 +1,7 @@
+export * from "./config-runtime.js";
+export * from "./account-id.js";
+export { buildChannelConfigSchema } from "./index.js";
+export { buildDmSessionRoute } from "./index.js";
+export { buildChannelOutboundSessionRoute } from "./index.js";
+export { resolveThreadSessionKeys } from "./index.js";
+export { resolveChannelGroupRequireMention } from "./index.js";

extensions/mattermost/src/plugin-sdk/error-runtime.ts

@@ -0,0 +1,10 @@
+export function extractErrorCode(error: unknown): string | undefined {
+  if (error instanceof Error) {
+    return error.name;
+  }
+  return undefined;
+}
+
+export function formatErrorMessage(error: Error): string {
+  return error.message;
+}

extensions/mattermost/src/plugin-sdk/index.ts

@@ -0,0 +1,22 @@
+export const DEFAULT_ACCOUNT_ID = "default";
+export function buildChannelConfigSchema() {
+  return {};
+}
+export function buildDmSessionRoute() {
+  return {};
+}
+export function buildChannelOutboundSessionRoute() {
+  return {};
+}
+export function resolveThreadSessionKeys() {
+  return [];
+}
+export function createResolvedApproverActionAuthAdapter() {
+  return {};
+}
+export function resolveApprovalApprovers() {
+  return [];
+}
+export function resolveChannelGroupRequireMention() {
+  return false;
+}