Vercel: Computer use CLI for AI agents

agent-desktop is a CLI and C library for macOS, Windows, and Linux that reads a desktop app's accessibility tree as JSON, giving each actionable element a ref that an agent acts on and then re-reads the UI to verify. It contains no model and no GUI, prints one JSON envelope per command, and covers desktop apps only, not web pages. It is limited to what apps expose through their accessibility APIs (AX API, UI Automation, AT-SPI).