Cmux Status

OpenCode 2.x plugin that surfaces agent activity in the cmux sidebar:

• a status pill per project (working, waiting, done, error, idle)
• a workspace progress bar (time-based estimate while working, 100% on done)
• sidebar log lines on state changes
• cmux notifications when input is needed, a run fails, or a turn finishes

Fork of 4m1z/opencode-tmux-session-status (MIT). The state machine, V2 event decoding and hook wiring are upstream; the tmux adapter was replaced with a cmux backend, and the plugin now tracks only the project location it was loaded for. See CHANGELOG.md.

Requirements

• OpenCode 2 (@opencode/plugin ^2.0.0)
• cmux installed and on PATH
• CMUX_WORKSPACE_ID present in the OpenCode server environment (it is when OpenCode is started from a cmux-managed terminal)

Outside cmux the plugin is a no-op. There is no tmux dependency.

Install

npm

opencode plugin add opencode-cmux-status

or in opencode.json / opencode.jsonc:

{
  "plugins": ["opencode-cmux-status"],
}

From a local checkout

OpenCode 2.0.18 cannot install github: plugin specs (NpmInstallFailedError: git dep preparation failed); the same failure happens with the upstream package, so it is an OpenCode-side issue. Until it is fixed, install from a local checkout:

git clone https://github.com/daropotter/opencode-cmux-status \
  ~/.config/opencode/plugins/opencode-cmux-status

Then create ~/.config/opencode/plugins/opencode-cmux-status.js:

export { default } from "./opencode-cmux-status/src/index.ts";

OpenCode auto-discovers direct .js / .ts files in ~/.config/opencode/plugins/. Update later with:

git -C ~/.config/opencode/plugins/opencode-cmux-status pull

Options

{
  "plugins": [
    {
      "package": "opencode-cmux-status",
      "options": {
        "bin": "cmux", // cmux executable (default: $OPENCODE_CMUX_BIN or "cmux")
        "workspace": "6F707E24-...", // default: $CMUX_WORKSPACE_ID
        "statusKeyPrefix": "opencode-", // prefix for per-project status keys
        "notifications": true,
        "notificationCooldownMs": 120000,
        "changedDetailFloorMs": 15000,
        "notificationDetail": "full", // "state" hides details in notifications
        "progress": true,
        "logs": true,
        "debug": false, // rate-limited diagnostics on stderr
      },
    },
  ],
}

State model

State	Meaning
working	agent is actively running
waiting	permission request or open question
done	turn finished (persists until the next prompt)
error	run failed / question rejected
idle	session created, no work outstanding

Transitions come from OpenCode 2 events (session.status, session.idle, session.error, permission.*, question.* / form.*, tool hooks, prompt hooks) with the upstream state machine. Status pills are keyed per project directory (<statusKeyPrefix> + first 8 hex chars of SHA-1 of the directory), so multiple projects in one cmux workspace keep separate pills. Progress and notifications are workspace-level cmux resources.

Differences from upstream

• cmux output backend (set-status, set-progress, log, notify) instead of tmux window options and omarchy/notify-send.
• Per-location tracking — OpenCode instantiates a plugin per project location while every instance sees the whole server event stream; this fork ignores events that do not belong to its own location, so statuses, logs and notifications are written once.
• Stable project keys — SHA-1 of the directory instead of a cksum hash and tmux session name.
• No acknowledgement flow — there is no tmux ack.sh; done stays visible until the next prompt starts.

Development

bun install
bun test
bun run typecheck
bun run build

License

MIT. Original work Copyright (c) 2026 4m1z; fork modifications Copyright (c) 2026 daropotter. See LICENSE.