Agent Skills: codex

OpenAI Codex second opinion via the codex CLI — three modes. Review: independent diff review with a pass/fail gate. Challenge: adversarial pass that tries to break the code. Consult: ask Codex anything, with session continuity for follow-ups. Use when the user says \"codex review\", \"codex challenge\", \"ask codex\", or wants a second opinion from Codex.