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 product-definition phase. The current binary is deliberately only a scaffold. We are validating the terminal engine, UI stack, process/session model, ACP integration, packaging, and usage-data contracts before committing to 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.

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.