crewmux

Run Claude Code, Codex, Grok and other agent CLIs side by side in tmux — each in its own native UI — and let them hand work to each other through one small MCP server.

crewmux is a thin wrapper, not a new agent UI: every agent keeps its vendor's own interface, permissions and conversation history. crewmux only opens them, adds a sidebar and a tab bar, and delivers messages between them.

Full manual: docs/usage.md · guide for AI agents: docs/agent-guide.md

 crewmux-myrepo  ≡ 0:harness  ● 1:planner claude  ● 2:coder codex ✉1        ? 1 question(s) · C-b a
┌ harness ───────────────────┐┌ planner · claude ──────────────────────────────────────────────────┐
│AGENTS                      ││ Claude Code  (the real CLI, untouched)                             │
│● planner  claude ◀ here    ││                                                                    │
│● coder    codex            ││ ❯                                                                  │
│ASKING YOU (1)              ││                                                                    │
│coder: merge now?           ││                                                                    │
│MESSAGES                    ││                                                                    │
│14:31 planner→coder req ✓   ││                                                                    │
└────────────────────────────┘└────────────────────────────────────────────────────────────────────┘

Features

• One command per project — crewmux creates .crewmux/ on first use and opens the team.

• Agents talk to each other — MCP tools send_message, submit_review, report_artifact, ask_user, list_agents, update_board; a message is pasted into the recipient's terminal.

• Resume — close and reopen, each role continues its own conversation (Claude, Codex, Grok).

• Add / remove agents while running — crewmux open <role> / crewmux close <role> (or Ctrl-b n / Ctrl-b X); roles.yaml is re-read on open.

• Any CLI via YAML — describe how to pass the prompt, session id, resume and MCP in cli:; no code change needed. Grok support is just such a preset.

• Built-in help for agents — the guide MCP tool lets an agent answer "how do I configure…" and do it for you.

• Status boards in the browser — Ctrl-b B / crewmux board [name] (127.0.0.1, a new token every run): team is generated from what the agents do, plan follows your plan.md (- [x] / - [~] / - [!] + 🟢🟡🟠⚪), and agents write release (GO / NO-GO), review, debug and handoff boards with update_board. crewmux board export <name> saves one self-contained HTML file to attach to a PR.

• Isolated — one private tmux server per project (tmux -L crewmux-<project>); your own tmux and your CLIs' global configs are never modified.

Related MCP server: xtalk

Requirements

Linux or WSL, Node.js ≥ 22, tmux ≥ 3.2, and the agent CLIs you want to use, already logged in (claude, codex, grok, …). pnpm is only needed to build from source.

Install

npm i -g crewmux
crewmux help

From source: git clone https://github.com/wasuza12345/crewmux && cd crewmux && pnpm install && pnpm build && npm link. Uninstall: npm uninstall -g crewmux.

Use

cd ~/projects/<your-repo>
crewmux                                   # create .crewmux/ if missing → open planner (claude) + coder (codex)
crewmux open reviewer                     # add a role while running
crewmux status                            # who is running
crewmux down                              # stop everything (conversations resume next time)

VS Code's terminal takes Ctrl+B for its sidebar — set "terminal.integrated.sendKeybindingsToShell": true.

Configure

.crewmux/ in your project:

config.yaml   roles.yaml   agents/<id>.yaml   prompts/<role>.md   rules/*.md   policy.yaml   state/ (not committed)

# roles.yaml — a role is an address other agents send messages to
roles:
  planner: { agent: claude, prompt: planner.md }
  coder:   { agent: codex,  prompt: coder.md }
  grok:    { agent: grok,   autostart: false }

# agents/grok.yaml
id: grok
kind: grok            # claude | codex | grok | custom
# args: ["--always-approve"]

Or simply ask any agent: "add Grok as a new role" — it calls the guide tool and does it. Every field is documented in docs/agent-guide.md.

Security

• The MCP server listens on 127.0.0.1 only; each agent session gets its own bearer token, and the sender of every message is taken from that token. Board pages are served on the same 127.0.0.1 port and need a separate per-run view token (stored 0600, never logged).

• Permission prompts stay with each vendor CLI. Bypass flags are opt-in per agent — read SECURITY.md before enabling them (agents can prompt-inject each other).

Development

pnpm typecheck && pnpm test     # vitest, including end-to-end tests on a private tmux server

Architecture and code rules: CLEAN-CODE.md.

Disclaimer

crewmux is an independent project, not affiliated with or endorsed by Anthropic, OpenAI or xAI. Claude, Codex and Grok are trademarks of their respective owners. crewmux only starts their official CLIs with your own accounts. It is provided "as is" (see LICENSE); agents you run through it can modify files and execute commands — review what they do.

License

MIT