# cmux

A terminal and browser workspace with agent attention signals.

Revision: 2026-09-13.4 · Review: unreviewed

Commissioned by a Nimbalyst maintainer; not an independent comparison.

## Applicability

Repository documentation at 22ae1c56fd83103e2d9c80ec3341a9a08557e6e1; Unpinned public documentation and/or pinned README sections reviewed 2026-09-13; per-claim source scope applies.. Documentation review only.

## Claims

- **yes · documented**: Organizes concurrent agent terminals in tabs and splits. [cmux · readme](https://github.com/manaflow-ai/cmux/blob/22ae1c56fd83103e2d9c80ec3341a9a08557e6e1/README.md) Scope: Documentation claim for the cited product surface; not runtime-tested. See source locator and dossier limitations.
- **yes · documented**: Integrates hooks for multiple coding-agent CLIs. [cmux · readme](https://github.com/manaflow-ai/cmux/blob/22ae1c56fd83103e2d9c80ec3341a9a08557e6e1/README.md) Scope: Documentation claim for the cited product surface; not runtime-tested. See source locator and dossier limitations.
- **yes · documented**: Highlights panes when agents need attention. [cmux · readme](https://github.com/manaflow-ai/cmux/blob/22ae1c56fd83103e2d9c80ec3341a9a08557e6e1/README.md) Scope: Documentation claim for the cited product surface; not runtime-tested. See source locator and dossier limitations.
- **yes · documented**: Uses Ghostty-based terminal rendering. [cmux · readme](https://github.com/manaflow-ai/cmux/blob/22ae1c56fd83103e2d9c80ec3341a9a08557e6e1/README.md) Scope: Documentation claim for the cited product surface; not runtime-tested. See source locator and dossier limitations.
- **yes · documented**: Includes a browser with an agent-facing control API. [cmux · readme](https://github.com/manaflow-ai/cmux/blob/22ae1c56fd83103e2d9c80ec3341a9a08557e6e1/README.md) Scope: Documentation claim for the cited product surface; not runtime-tested. See source locator and dossier limitations.
- **yes · documented**: Creates remote SSH workspaces. [cmux · readme](https://github.com/manaflow-ai/cmux/blob/22ae1c56fd83103e2d9c80ec3341a9a08557e6e1/README.md) Scope: Documentation claim for the cited product surface; not runtime-tested. See source locator and dossier limitations.
- **yes · documented**: Exposes CLI and socket control for workspaces and browser. [cmux · readme](https://github.com/manaflow-ai/cmux/blob/22ae1c56fd83103e2d9c80ec3341a9a08557e6e1/README.md) Scope: Documentation claim for the cited product surface; not runtime-tested. See source locator and dossier limitations.
- **yes · documented**: Defines project actions in cmux.json. [cmux · readme](https://github.com/manaflow-ai/cmux/blob/22ae1c56fd83103e2d9c80ec3341a9a08557e6e1/README.md) Scope: Documentation claim for the cited product surface; not runtime-tested. See source locator and dossier limitations.
- **yes · documented**: Restores supported agent sessions using saved native IDs. [cmux · readme](https://github.com/manaflow-ai/cmux/blob/22ae1c56fd83103e2d9c80ec3341a9a08557e6e1/README.md) Scope: Documentation claim for the cited product surface; not runtime-tested. See source locator and dossier limitations.
- **yes · documented**: Claude teammates appear as native terminal splits. [cmux · readme](https://github.com/manaflow-ai/cmux/blob/22ae1c56fd83103e2d9c80ec3341a9a08557e6e1/README.md) Scope: Delegated to Claude Code teams; requires compatible runtime and integration. Documentation only; not runtime-tested.
- **yes · documented**: Groups agent and teammate panes within workspaces. [cmux · readme](https://github.com/manaflow-ai/cmux/blob/22ae1c56fd83103e2d9c80ec3341a9a08557e6e1/README.md) Scope: Terminal pane grouping; not shared conversation context. Documentation only; not runtime-tested.
- **partial · documented**: Restores layout and resumes supported agents using saved native IDs. [cmux · readme](https://github.com/manaflow-ai/cmux/blob/22ae1c56fd83103e2d9c80ec3341a9a08557e6e1/README.md) Scope: Hooks required for agent resume. Arbitrary live processes are not checkpointed. Documentation only; not runtime-tested.
- **yes · documented**: Integrated Claude Code teammates communicate through the runtime. [cmux · claude teams](https://cmux.com/docs/agent-integrations/claude-code-teams) [cmux · claude messaging](https://code.claude.com/docs/en/agent-teams) Scope: Composed documentation inference: cmux enables experimental Claude teams; messaging is Claude runtime behavior, not native cross-provider routing. Documentation only; not runtime-tested.

## Open questions

- Ordinary process memory is not checkpointed during session restore.
- README calls the project GPL-licensed; exact license terms need separate review.

## Verification plan

1. Pin a product release or repository commit and record the host environment.
2. Create a disposable repository with a passing baseline test.
3. Run a bounded change with two agents where supported; record permissions and logs.
4. Record a failed attempt, actual outcome, and artifacts without secrets.
5. Have another person reproduce the result before labeling it reproduced.

Last checked: 2026-09-13. Recheck by: 2026-10-13.

Content rights: Unlicensed prototype; redistribution decision pending.