hunk_review_changes serves a local browser UI for reviewing a diff one hunk at a time. An AI coding agent writes a bundle of pieces (each a diff hunk with a what/why explanation), launches this server, and you comment on each piece at your own pace. Clicking Done writes a paste-ready export the agent picks up to implement every requested change. Ships a companion skill installable into Claude Code, Codex, Cursor, and OpenCode.