1# Production systems – Codex1# Production systems
2
3Navigate, refactor, and review real codebases.
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3The use cases in this collection are useful when Codex is working in a repo that already has history, tests, owners, and production constraints.5The use cases in this collection are useful when Codex is working in a repo that already has history, tests, owners, and production constraints.
4Codex is particularly good at navigating complex codebases, including sprawling monorepos with lots of different services and dependencies.6Codex is particularly good at navigating complex codebases, including sprawling monorepos with lots of different services and dependencies.
5If you’re working on a production system, get familiar with these use cases to understand how Codex can help you.7If you're working on a production system, get familiar with these use cases to understand how Codex can help you.
6 8
7## Start with a codebase tour9## Start with a codebase tour
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9Use Codex to get familiar with a complex codebase, which is especially useful when onboarding onto a repo for production software.11Use Codex to get familiar with a complex codebase, which is especially useful when onboarding onto a repo for production software.
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11[13- https://developers.openai.com/codex/use-cases/codebase-onboarding
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13### Understand large codebases
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15Use Codex to map unfamiliar codebases, explain different modules and data flow, and point...
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17Engineering Analysis](https://developers.openai.com/codex/use-cases/codebase-onboarding)
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19## Modernize the codebase15## Modernize the codebase
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21Leverage Codex to plan tech stack migrations, upgrade your integration to the latest models if applicable, and refactor the codebase to improve readability and maintainability.17Leverage Codex to plan tech stack migrations, upgrade your integration to the latest models if applicable, and refactor the codebase to improve readability and maintainability.
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23[19- https://developers.openai.com/codex/use-cases/api-integration-migrations
24 20- https://developers.openai.com/codex/use-cases/refactor-your-codebase
25### Upgrade your API integration21- https://developers.openai.com/codex/use-cases/code-migrations
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27Use Codex to update your existing OpenAI API integration to the latest recommended models...
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29Evaluation Engineering](https://developers.openai.com/codex/use-cases/api-integration-migrations)[
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31### Refactor your codebase
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33Use Codex to remove dead code, untangle large files, collapse duplicated logic, and...
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35Engineering Code](https://developers.openai.com/codex/use-cases/refactor-your-codebase)[
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37### Run code migrations
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39Use Codex to map a legacy system to a new stack, land the move in milestones, and validate...
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41Engineering Code](https://developers.openai.com/codex/use-cases/code-migrations)
42 22
43## Codify repeatable work23## Codify repeatable work
44 24
45Ask Codex to turn repo-specific workflows or checklists into a skill, so that all repo contributors can benefit from a standardized process.25Ask Codex to turn repo-specific workflows or checklists into a skill, so that all repo contributors can benefit from a standardized process.
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47[27- https://developers.openai.com/codex/use-cases/reusable-codex-skills
48
49### Save workflows as skills
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51Turn a working Codex thread, review rules, test commands, release checklists, design...
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53Engineering Workflow](https://developers.openai.com/codex/use-cases/reusable-codex-skills)
54 28
55## Keep documentation current29## Keep documentation current
56 30
57Ask Codex to compare source changes with existing docs, update the smallest useful docs surface, and verify the changes.31Ask Codex to compare source changes with existing docs, update the smallest useful docs surface, and verify the changes.
58 32
59[33- https://developers.openai.com/codex/use-cases/update-documentation
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61### Keep documentation up-to-date
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63Use Codex to compare source code changes, public docs, release notes, and PR context, then...
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65Engineering Code](https://developers.openai.com/codex/use-cases/update-documentation)
66 34
67## Maintain system health35## Maintain system health
68 36
69Let Codex pick up feature requests and bug fixes automatically by using it from Slack and connecting it to your alerting, issue tracking, and daily bug sweeps.37Let Codex pick up feature requests and bug fixes automatically by using it from Slack and connecting it to your alerting, issue tracking, and daily bug sweeps.
70 38
71[39- https://developers.openai.com/codex/use-cases/slack-coding-tasks
72 40- https://developers.openai.com/codex/use-cases/automation-bug-triage
73### Kick off coding tasks from Slack
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75Mention `@Codex` in Slack to start a task tied to the right repo and environment, then...
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77Integrations Workflow](https://developers.openai.com/codex/use-cases/slack-coding-tasks)[
78
79### Automate bug triage
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81Ask Codex to check recent alerts, issues, failed checks, logs, and chat reports, tune the...
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83Automation Quality](https://developers.openai.com/codex/use-cases/automation-bug-triage)
84 41
85## Avoid the review bottleneck42## Avoid the review bottleneck
86 43
87Use Codex to automatically review PRs and run focused QA passes on critical flows, so you can catch issues quickly and ship updates confidently.44Use Codex to automatically review PRs and run focused QA passes on critical flows, so you can catch issues quickly and ship updates confidently.
88 45
89[46- https://developers.openai.com/codex/use-cases/github-code-reviews
90 47- https://developers.openai.com/codex/use-cases/qa-your-app-with-computer-use
91### Review GitHub pull requests
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93Use Codex code review in GitHub to automatically surface regressions, missing tests, and...
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95Integrations Workflow](https://developers.openai.com/codex/use-cases/github-code-reviews)[
96
97### QA your app with Computer Use
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99Use Computer Use to exercise key flows, catch issues, and finish with a bug report.
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101Automation Quality](https://developers.openai.com/codex/use-cases/qa-your-app-with-computer-use)
102
