This is the bridge between Claude and Proof's collaborative markdown editor. It handles two workflows: sharing a doc to the web for async review (no install needed), or running a full human-in-the-loop cycle where you push a local markdown file to Proof, wait for comments and edits from a human reviewer, then sync the final version back to disk. The latter is the main event and gets called explicitly ("HITL this spec") or handed off from brainstorm and planning skills. The implementation is careful about attribution, baseToken discipline, and edit narrowness. It knows not to rewrite entire documents when a targeted block edit or find-replace will do, and it treats 4xx errors as ambiguous until verified by re-reading state.
npx skills add https://github.com/everyinc/compound-engineering-plugin --skill ce-proof