Codex Plan Review

Get a GPT-5.5 second opinion on an implementation plan or design proposal before writing code. Runs both a standard 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," "pressure-test," or "sanity check" on a plan, design, approach, or proposed implementation — even if Codex isn't named explicitly. Also use when the user has just written or accepted a plan and is about to start implementation. Do NOT use for already-…