Ahmad Awais Builds a 400-Line Swift macOS VM Runner for Agent Testing

Key Info

Ahmad Awais says he deleted tart and wrote his own macOS VM runner in roughly 400 lines of Swift, with zero dependencies and a promise-based stop API, so AI agents can test Mac apps he is building without hijacking his screen, focus, or cursor.

Highlights

• Replaced the existing tart tool with a custom macOS VM runner.
• Implementation is about 400 lines of Swift with zero dependencies.
• Includes a better stop API built around promises.
• Enables agents to test Mac apps in isolation without taking over the user's screen, focus, or cursor.