use-cases/github-code-reviews.md Codex Docs, 2026-04-14 18:31 UTC → 2026-05-02 06:45 UTC

1# Review pull requests faster | Codex use cases1# Codex code review for GitHub pull requests | Codex use cases

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3Codex use cases

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5![](/assets/OpenAI-black-wordmark.svg)

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7![Codex](/assets/OAI_Codex-Lockup_Fallback_Black.svg)

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9Codex use case

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11# Codex code review for GitHub pull requests

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13Catch regressions and potential issues before human review.

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15Difficulty **Easy**

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17Time horizon **5s**

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19Use Codex code review in GitHub to automatically surface regressions, missing tests, and documentation issues directly on a pull request.

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21## Best for

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23 - Teams that want another review signal before human merge approval

24 - Large codebases for projects in production

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26# Contents

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3[← All use cases](https://developers.openai.com/codex/use-cases)28[← All use cases](https://developers.openai.com/codex/use-cases)

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5Copy page [Export as PDF](https://developers.openai.com/codex/use-cases/github-code-reviews/?export=pdf)30Copy page [Export as PDF](https://developers.openai.com/codex/use-cases/github-code-reviews/?export=pdf)

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7Use Codex in GitHub to automatically surface regressions, missing tests, and documentation issues directly on a pull request.32Use Codex code review in GitHub to automatically surface regressions, missing tests, and documentation issues directly on a pull request.

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9Easy34Easy

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13Related links38Related links

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15[Use Codex in GitHub](https://developers.openai.com/codex/integrations/github) [Custom instructions with AGENTS.md](https://developers.openai.com/codex/guides/agents-md)40[Codex code review in GitHub](https://developers.openai.com/codex/integrations/github) [Custom instructions with AGENTS.md](https://developers.openai.com/codex/guides/agents-md)

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17## Best for42## Best for

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37 62 

38## How to use63## How to use

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40Start by adding Codex code review to your GitHub organization or repository. See [Use Codex in GitHub](https://developers.openai.com/codex/integrations/github) for more details.65Start by adding Codex code review to your GitHub organization or repository.

66See [Codex code review in GitHub](https://developers.openai.com/codex/integrations/github) for more details.

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42You can set up Codex to automatically review every pull request, or you can request a review with `@codex review` in a pull request comment.68You can set up Codex to automatically review every pull request, or you can request a review with `@codex review` in a pull request comment.

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46This will start a new cloud task that will fix the issue and update the pull request.72This will start a new cloud task that will fix the issue and update the pull request.

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48## Define additional guidance74## Define review guidance

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50To customize what Codex reviews, add or update a top-level `AGENTS.md` with a section like this:76To customize what Codex reviews, add or update a top-level `AGENTS.md` with a section like this:

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62 88 

63## Related use cases89## Related use cases

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65[![](/images/codex/codex-wallpaper-1.webp)91[![](/images/codex/codex-wallpaper-2.webp)

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67### Bring your app to ChatGPT93### Deploy an app or website

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69Build one narrow ChatGPT app outcome end to end: define the tools, scaffold the MCP server...95Use Codex with Build Web Apps and Vercel to turn a repo, screenshot, design, or rough app...

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71Integrations Code](https://developers.openai.com/codex/use-cases/chatgpt-apps)[![](/images/codex/codex-wallpaper-2.webp)97Front-end Integrations](https://developers.openai.com/codex/use-cases/deploy-app-or-website)[![](/images/codex/codex-wallpaper-1.webp)

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73### Coordinate new-hire onboarding99### Bring your app to ChatGPT

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75Use Codex to gather approved new-hire context, stage tracker updates, draft team-by-team...101Build one narrow ChatGPT app outcome end to end: define the tools, scaffold the MCP server...

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77Integrations Data](https://developers.openai.com/codex/use-cases/new-hire-onboarding)[![](/images/codex/codex-wallpaper-2.webp)103Integrations Code](https://developers.openai.com/codex/use-cases/chatgpt-apps)[![](/images/codex/codex-wallpaper-1.webp)

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79### Create a CLI Codex can use105### Complete tasks from messages

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81Ask Codex to create a composable CLI it can run from any folder, combine with repo scripts...107Use Computer Use to read one Messages thread, complete the task, and draft a reply.

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83Engineering Code](https://developers.openai.com/codex/use-cases/agent-friendly-clis)109Knowledge Work Integrations](https://developers.openai.com/codex/use-cases/complete-tasks-from-messages)