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Muster for Mac

Menu bar app to manage Claude Code, Codex, and Cursor sessions and reply to agents.

By josefchen. Free and open source, MIT licence.

Get it with OpenDMG View source on GitHub

Muster at a glance

Version
1.4.0
Released
21 October 2026
Download size
3.6 MB
Works on
Apple silicon and Intel
Licence
MIT
Category
Artificial Intelligence
Developer
josefchen
GitHub stars
58

About Muster

Never keep an agent waiting. A free, open-source Mac menu bar app for Claude Code, Codex and Cursor: see which session needs you and answer it with one keystroke.

Screenshots

Muster screenshot 1Muster screenshot 2Muster screenshot 3Muster screenshot 4

How to install Muster on a Mac

  1. Get OpenDMG. It is a free app store for open source Mac apps. Download OpenDMG.
  2. Search for Muster and press Get. OpenDMG downloads version 1.4.0 from josefchen's own GitHub release.
  3. Open it. The download is checked against its SHA-256 fingerprint and its signature is checked on your Mac before it lands in Applications.

Updates to Muster show up in OpenDMG and install with one button. No account is needed.

Prefer to do it by hand? The developer's file is on GitHub: Muster.dmg (3.6 MB).

What is new in Muster 1.4.0

**Muster 1.4.** Watch sessions on your SSH hosts alongside this Mac, with clearer connection states.

- **Watch your other machines.** Enable hosts in Settings → Remote sessions to monitor recent Codex, Claude Code and Cursor sessions through your existing SSH access. Questions show the host where you answer; disconnected hosts keep their last summaries and reconnect automatically. Python 3 is required on each host.
- **Remote approvals reach Muster.** Optional hooks relay Claude Code and Codex permission requests over SSH, including requests absent from session logs. Answers return to the correct host and request. A lost connection hands the decision back to the agent.
- **Questions that come and go.** Recognizes both Codex question APIs. A question keeps asking until you answer it, write to that thread, or three hours pass, so one you moved on from no longer says Needs you for days. Answering one question in a batch keeps the rest. Long remote tool output no longer pushes a waiting question out of view.
- **No false alarms from slow commands.** With Muster's hook delivering Claude's real prompts, a build or test that runs a while stays Working instead of being taken for a permission prompt.
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