Lumbridge is a fast, local-first workspace and terminal multiplexer for agentic engineers. It will run coding harnesses side by side, preserve their sessions, connect rich agents through ACP, and show trustworthy account and usage context without forcing users into one model vendor.

The first supported desktop platforms are:

macOS (Apple Silicon first, Intel when CI capacity is available)
Ubuntu Linux
Omarchy and compatible Arch Linux systems

Lumbridge is free and open source under Apache-2.0. Releases will be published as installable binaries; building from source will remain supported.

Status

This repository is in architecture and vertical-slice phase. The installable binary is still a scaffold, while the isolated native UI spikes now exercise an interactive 20/60/20 workspace backed by six live comparison surfaces, and the root workspace contains the first bounded local PTY, runtime actor, VT engine, and capability-gated workspace command boundaries. The GPUI slice shows a responsive one-, three-, or five-panel workspace—five on a 3440 px ultrawide— where every panel owns its own context, work surface, and decision shelf. One panel contains a styled actor-owned VT session and five comparison surfaces remain deterministic. Retained-history navigation is wired. We are still validating terminal text selection and mouse input, standalone runtime IPC/durability, ACP integration, packaging, and usage-data contracts before a large implementation.

Product shape

A native desktop shell with tabs, panes, workspaces, worktrees, diffs, and an agent-aware footer.
A Rust session runtime that survives UI restarts and can later run headless.
ACP-native integrations where available, with supervised PTYs as the universal fallback for any CLI harness.
First-class harnesses for Claude Code, Codex, DeepSeek Harness, Pi, Hermes, OpenClaw, Goose, Gemini CLI, and OpenCode.
Subscription login owned by the upstream harness, plus separate BYOK provider profiles for OpenAI, Anthropic, Gemini, Groq, Cerebras, DeepSeek, and more.
Usage history, burn rate, reset windows, and forecasts with visible data provenance instead of invented precision.
Optional first-class Buzz channels, messages, agents, and confirmed redacted pane sharing without making Buzz a requirement.
An optional Lumbridge Harness that can suggest, coordinate, and—with explicit execution capability—manage agents through the same audited command plane as the human UI. Lumbridge remains useful without it.

Start with the product spec, architecture, research map, and captured upstream revisions. The native UI choice is intentionally open; see the measured decision plan.

Scaffold

bacon              # continuous check; t tests, c lints, v runs the full gate
cargo xtest         # fast isolated tests with nextest
./scripts/ci.sh     # format + strict Clippy + tests + doctests
cargo run -p lumbridge

See the testing strategy for fake harnesses, ACP replay, terminal conformance, UI driving, recovery, performance, and packaging tests.

The accepted local/remote boundary is recorded in decision 0003. The two native shell candidates live in spikes/, with results tracked in the UI scorecard. The signed-protocol and pane-sharing boundary is in the Buzz integration design. Brand masters, platform-ready raster exports, and usage rules are in assets/brand/ and the brand guide.