What Codex "/review" does

Codex’s /review slash command spins up a dedicated reviewer thread that applies a strict built-in rubric to surface actionable bugs before you merge. The rubric — published in the open-source repo as codex-rs review guidelines — is worth reading on its own: it flags only discrete, provable, newly introduced bugs the author would actually fix, and explicitly refuses speculative or pre-existing issues.

For teams weighing agentic review against human cycles, the rubric doubles as a free spec for what “reviewable” means — the same bar we applied when weighing Claude 4.5 against Codex for enterprise work.