Codex Auto-review Explained: What It Checks, How to Turn It On, and What It Misses

Codex Auto-review is a permission mode that uses a separate Codex agent to approve or deny requests to exceed sandbox boundaries during a coding session, such as escalated shell commands, blocked network access, protected file edits, and selected tool calls, reducing the need for human approval while retaining existing sandbox limits. Available free to signed-in ChatGPT users as of October 2026 according to the source, it must be enabled alongside an interactive approval policy and does not operate when agents have unrestricted access or approvals are disabled. The text distinguishes Auto-review from Codex code review for pull requests and argues that neither verifies whether an entire completed workflow produced correct system-wide results. It presents TestMu AI’s Agent Assurance as a complementary pre-release process that evaluates finished workflows against deterministic specifications derived from existing requirements, emphasizing that permission checks address whether an action may run, whereas outcome assurance evaluates whether the resulting state is correct.

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