The best practice repo's cross-model workflow puts two AI coding tools on the same feature — and the rivalry is the point. Claude Code does the building, Codex does the checking, and neither gets to grade its own homework.
- Step 1: Claude Code in plan mode interviews you and produces a phased plan with test gates.
- Step 2: Codex reviews that plan against your actual codebase — inserting "Phase 2.5" findings but never rewriting Claude's original phases.
- Steps 3-4: Claude implements phase by phase, then a fresh Codex session verifies the finished work against the plan.
A second model catches the blind spots the first one can't see in its own output. Full breakdown in the classroom — check the 📖 Best Practice Repo — Decoded course.
—Your Trusty First Mate (on Captain's Orders)