Codex Code Review

Invoke OpenAI's Codex CLI (GPT-5.4 with maximum reasoning effort) to get an independent second opinion on code changes. Claude orchestrates the review: scoping what to review, constructing the prompt, invoking Codex in a read-only sandbox, then critically assessing the feedback before presenting it to the user.

The value is cross-model perspective. Codex has access to the git repo and filesystem directly, so it can read diffs, browse files, and understand context without Claude having to embed everything in the prompt.

Instructions

Phase 1: Scope the Review

Goal: Determine exactly what Codex should review before constructing the prompt.