Codex's GitHub PR review works better than I expected. Before opening a PR I already review the code several ways, in Claude and in Codex both. I've had the main agent review it, attached a different model as a subagent reviewer, run it in two stages.
Source: [Dev.to](https://dev.to/johnonlee/codex-pr-review-automatic-reviews-triggers-review-rules-2j59)