Codex Diff Review

Get a GPT-5.5 second opinion on a code change (working tree or branch diff) before commit or merge. Runs both a standard code review and an adversarial pressure-test in parallel via Codex CLI, then reconciles their feedback against Claude's own analysis and surfaces a structured agreement / disagreement / open-questions report. Use this skill whenever the user asks for a "second opinion," "Codex review," "GPT-5 review," "cross-check," "pre-commit review," or "sanity check" on code that has already been written — even if Codex isn't named explicitly. Also use when the user mentions reviewing a diff against main, a feature branch, or staged changes. Do NOT use for plans or …