AI code review on every pull request with Claude Code and Codex

Three ways to get AI review on a pull request

How to review a pull request with Claude Code or Codex

1. Claude Code: run /code-review

   In a Claude Code session, /code-review finds bugs in your branch's changes; pass a PR number to review that pull request and --comment to post the findings on GitHub as inline comments. --fix applies them to your working tree instead. /review is an alias.

   # Claude Code: review a pull request and post inline comments
   /code-review 142 --comment
   
   # Codex: ask for a review in a PR comment on GitHub
   @codex review
   @codex review for issues in the database migration

2. Codex: mention @codex review

   In a pull request comment, write @codex review; Codex reacts with 👀 and posts a review. Add a focus after it if you want one. To review without asking, turn on Automatic review in Codex settings and choose the trigger.

3. Write your review rules down

   Codex reads a ## Code Review Rules section from the AGENTS.md closest to the code. For Claude Code, put the same rules in CLAUDE.md. Rules make reviews consistent and keep them off topics your linter already covers.

   ## Code Review Rules
   - Flag missing tests for new branches in billing/ and auth/.
   - Any SQL migration needs a rollback; say so if it doesn't have one.
   - Don't comment on formatting; the linter handles it.
   - Approve nothing and request changes on nothing: comment only.

Source: Claude Code docs, review locally with /code-review

What AI review won't do

• Approve or block: Claude's managed Code Review never approves or blocks a pull request, and a good review brief tells an employee to comment only.
• Replace the person who owns the change: it catches bugs and missing tests; product and design calls stay with people.
• See everything: Codex on GitHub flags only P0 and P1 issues to keep comments focused. Ask for a specific focus when you need one.
• Cost nothing: reviews use your plan's usage. Review on request, or on ready-for-review, rather than on every push.

Step by step for Claude Code and Codex

The built-in commands, the tools to connect and the schedule for each agent: Claude Code code review and Codex code review.

Make review someone's job

Commands review when someone remembers to run them. An AI employee reviews because it's the job: Crewmark turns your Claude Code or Codex into an engineer that wakes on a heartbeat, picks up pull requests waiting for review and comments on them.

1. Start from the role

   The AI software engineer, with your review rules in its brief.

2. Route reviews to the board

   Assign it review issues, or add a recurring issue to review every open pull request marked ready.

3. More engineering jobs

   See Claude Code for engineering and Sentry error triage.

FAQ