FCPXML MCP
Edit Final Cut Pro by talking to Claude, and watch the cut change.

One prompt, seven tool calls, and the timeline re-rendered inline after each
write. Every frame is the real ui://fcp/timeline app drawing a real
view_timeline result; the B-roll provider is mocked and the recording says
so on screen. Full-size mp4, re-recorded
with demo/hero/build.py.
See it. view returns the timeline as exact rational-time JSON, and a
host with MCP Apps draws it inline: lanes, thumbnails, markers, transcript
words, a playhead, buttons that call the other tools.
Cut it. 15 grouped tools, 102 operations: trims, splits, silence removal, markers from transcripts and beats, rough cuts, keyframes and speed ramps, transcript edits, cross-NLE export, and a push into a running Final Cut Pro.
Trust it. Every write is journaled with its sha256 and can be undone.
deliver refuses an unreviewed cut, expected_sha256 refuses a file that
changed under the model, and generation is quote-then-confirm under a
per-call cap. 182 adversarial-input security tests, defusedxml everywhere,
sandboxed writes, no private APIs, and a disclosure channel.




