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.
What is the josefchen/muster GitHub project? Description: "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.". Written in Swift. Explain what it does, its main use cases, key features, and who would benefit from using it.
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