Before you start
Writing to Figma needs the remote server, and a Full seat to write outside your own drafts. It is in open beta, free for now and planned as a usage-based paid feature. Capturing your running UI works in select agents only.
Capture the running UI
Start your app locally and ask for the capture. Tell it to reuse your library so it doesn't redraw what you already have.
Say to Claude CodeStart a local server for my app and capture the login screen and dashboard in a new Figma file. Reuse my existing components and variables where they exist.
Tidy it in Figma
Expect a first pass, not a finished design. In Figma's own run, auto layout, fonts and unmapped colours needed work. Fix them yourself, and map stray colours to variables.
Pull the changes back
Link the frame you edited and say what changed.
Say to Claude Code