integrations/github.md Codex Docs, 2026-04-18 18:18 UTC → 2026-05-11 18:00 UTC

1# Use Codex in GitHub1# Codex code review in GitHub

2 2 

3Use Codex to review pull requests without leaving GitHub. Add a pull request comment with `@codex review`, and Codex replies with a standard GitHub code review.3Use Codex code review to get another high-signal review pass on GitHub pull

4requests. Codex reviews the pull request diff, follows your repository guidance,

5and posts a standard GitHub code review focused on serious issues.

4 6 

5## Set up code review7<YouTubeEmbed

8 title="Codex code review walkthrough"

9 videoId="HwbSWVg5Ln4"

10 class="max-w-md mr-auto"

11/>

12<br />

13 

14## Before you start

15 

16Make sure you have:

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18- [Codex cloud](https://developers.openai.com/codex/cloud) set up for the repository you want to review.

19- Access to [Codex code review settings](https://chatgpt.com/codex/settings/code-review).

20- An `AGENTS.md` file if you want Codex to follow repository-specific review guidance.

21 

22## Set up Codex code review

6 23 

71. Set up [Codex cloud](https://developers.openai.com/codex/cloud).241. Set up [Codex cloud](https://developers.openai.com/codex/cloud).

82. Go to [Codex settings](https://chatgpt.com/codex/settings/code-review) and turn on **Code review** for your repository.252. Go to [Codex settings](https://chatgpt.com/codex/settings/code-review).

263. Turn on **Code review** for your repository.

9 27 

10![Codex settings showing the Code review toggle](/images/codex/code-review/code-review-settings.png)28<div class="not-prose max-w-3xl mr-auto">

29 <img src="https://developers.openai.com/images/codex/code-review/code-review-settings.png"

30 alt="Codex settings showing the Code review toggle"

31 class="block h-auto w-full mx-0!"

32 />

33</div>

34<br />

11 35 

12## Request a review36## Request a Codex review

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141. In a pull request comment, mention `@codex review`.381. In a pull request comment, mention `@codex review`.

152. Wait for Codex to react (👀) and post a review.392. Wait for Codex to react (👀) and post a review.

16 40 

17![A pull request comment with @codex review](/images/codex/code-review/review-trigger.png)41<div class="not-prose max-w-xl mr-auto">

18 42 <img src="https://developers.openai.com/images/codex/code-review/review-trigger.png"

19Codex posts a review on the pull request, just like a teammate would.43 alt="A pull request comment with @codex review"

20 44 class="block h-auto w-full mx-0!"

21![Example Codex code review on a pull request](/images/codex/code-review/review-example.png)45 />

46</div>

47<br />

48 

49Codex posts a review on the pull request, just like a teammate would. In

50GitHub, Codex flags only P0 and P1 issues so review comments stay focused on

51high-priority risks.

52 

53<div class="not-prose max-w-3xl mr-auto">

54 <img src="https://developers.openai.com/images/codex/code-review/review-example.png"

55 alt="Example Codex code review on a pull request"

56 class="block h-auto w-full mx-0!"

57 />

58</div>

59<br />

22 60 

23## Enable automatic reviews61## Enable automatic reviews

24 62 

25If you want Codex to review every pull request automatically, turn on **Automatic reviews** in [Codex settings](https://chatgpt.com/codex/settings/code-review). Codex will post a review whenever a new PR is opened for review, without needing an `@codex review` comment.63If you want Codex to review every pull request automatically, turn on

64**Automatic reviews** in [Codex settings](https://chatgpt.com/codex/settings/code-review).

65Codex will post a review whenever someone opens a new PR for review, without

66needing an `@codex review` comment.

26 67 

27## Customize what Codex reviews68## Customize what Codex reviews

28 69 

39 80 

40Codex applies guidance from the closest `AGENTS.md` to each changed file. You can place more specific instructions deeper in the tree when particular packages need extra scrutiny.81Codex applies guidance from the closest `AGENTS.md` to each changed file. You can place more specific instructions deeper in the tree when particular packages need extra scrutiny.

41 82 

42For a one-off focus, add it to your pull request comment, for example:83For a one-off focus, add it to your pull request comment:

43 84 

44`@codex review for security regressions`85`@codex review for security regressions`

45 86 

46In GitHub, Codex flags only P0 and P1 issues. If you want Codex to flag typos in documentation, add guidance in `AGENTS.md` (for example, “Treat typos in docs as P1.”).87If you want Codex to flag typos in documentation, add guidance in `AGENTS.md`

88(for example, “Treat typos in docs as P1.”).

89 

90## Act on review findings

91 

92After Codex posts a review, you can ask it to fix issues in the same pull

93request by leaving another comment:

94 

95```md

96@codex fix the P1 issue

97```

98 

99Codex starts a cloud task with the pull request as context and can push a fix

100back to the branch when it has permission to do so.

47 101 

48## Give Codex other tasks102## Give Codex other tasks

49 103 

52```md106```md

53@codex fix the CI failures107@codex fix the CI failures

54```108```

109 

110## Troubleshoot code review

111 

112If Codex doesn't react or post a review:

113 

114- Confirm you turned on **Code review** for the repository in [Codex settings](https://chatgpt.com/codex/settings/code-review).

115- Confirm the pull request belongs to a repository with [Codex cloud](https://developers.openai.com/codex/cloud) set up.

116- Use the exact trigger `@codex review` in a pull request comment.

117- For automatic reviews, check that you turned on **Automatic reviews** and that

118 the pull request event matches your review trigger settings.