What problem does it solve? Getting a second AI model to rigorously review a plan or implementation usually means ad-hoc copy-paste between sessions with no shared protocol, no convergence criteria, and no clean commit discipline. This Skill gives Claude Code, Codex CLI, and Gemini CLI one identical review contract so two agents iterate over a single on-disk plan file until the reviewer declares it ready to ship. ## Core Features & Use Cases - Two-session review loop: An IMPLEMENTER and a REVIEWER exchange turns via footer markers in one plan file, with background watcher scripts detecting each handoff and terminator phrases ("ready for implementation", "ready to ship"). - Three modes: regular coreview (both sides may correct each other), coreviewlight (reviewer only steers), and shellrev (single session delegating to the revshell skill via blocking subprocess calls). - Guard-railed finish sequence: finish.sh merges only curated commits into dev/test (refusing wip/checkpoint/review-round subjects, never pushing), and save-learnings.sh writes exactly one docs(memory) commit with the session's goal, resolution, and learnings. - Use Case: After drafting a refactor plan, ask for a cross-model review; the reviewer agent edits the plan directly, then reviews the implemented diff round by round until it converges, and the host lands clean commits without any manual git choreography. ## Quick Start Run a coreview loop where Claude implements and Codex reviews my current plan, landing the approved work on the dev branch.