Muster

Muster

  Never keep an agent waiting.
  A free, open-source Mac menu bar app for your Claude Code, Codex and Cursor sessions.

  Download for Mac ·
  brew install --cask josefchen/tap/muster ·
  agentmuster.app ·
  Changelog ·
  简体中文

Two agents ask. ⌥↓ shows why, two presses of ⌥↩ answer them, and you never left what you were doing. Recorded from the app.

If you run a few coding agents at once, the slow part isn't the agents. It's noticing which one has been waiting on you for ten minutes. Muster sits in the menu bar, tells you the moment one needs you, and lets you answer without switching apps.

See who needs you.
A glass alert at the top of the screen the moment an agent waits on you. It stays until you answer.

Answer from anywhere.
Allow a command or pick an answer with ⌥↩, or right from the notification. The alert shows its keys.

See why before you answer.
⌥↓ unfolds the agent's reason, the whole command, or every option with its note.

Your keys stay yours.
Muster takes its keys only while something on screen needs them, and lets go while you type elsewhere.

⌥Tab to any agent.
Most urgent first. Let go to land in its window, or the terminal it runs in.

Find any session.
⌃⌥Space searches the last three hours, with tokens and API-rate cost for each.

Native AppKit and Liquid Glass · macOS 14+ · Apple silicon and Intel · no accounts or app analytics · MIT

Install

Download Muster.dmg and drag it to Applications, or:

macOS 14 or later, Apple silicon or Intel. Liquid Glass needs macOS 26.

Answer prompts from Muster

Turn it on per agent in Settings → Answer prompts from Muster.

The tour and Settings show each connection's progress. For Codex, Muster reads the client's hook status when supported, so a disabled, untrusted or changed hook stays pending. It…