4 stories
The accessibility tree is the labeled hierarchy macOS publishes for screen readers, and it gives an AI agent exact element coordinates instead of pixel guesses. A look at the token math against screenshots, the cases where the tree returns nothing, and how OpenOwl queries it through AXUIElement.
OpenOwl gives Claude Code eyes and hands on your Mac through 42 MCP tools, free at 50 tool calls a day with no credit card. A setup guide covering install, permissions, your first automation, and what the free tier actually covers.
MCP is a protocol for how models discover and call tools. Computer use is a capability where a model reads a screenshot and issues clicks. They solve different problems, and the token cost between them differs by an order of magnitude.
A practical comparison of MCP servers for desktop automation, covering how screenshot and accessibility-tree approaches differ, where Windows-MCP, mcp-desktop-automation, and OpenOwl each fit, and what the permission model actually requires.
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