The use cases in this collection are useful when Codex is working in a repo that already has history, tests, owners, and production constraints. Codex is particularly good at navigating complex codebases, including sprawling monorepos with lots of different services and dependencies. If you’re working on a production system, get familiar with these use cases to understand how Codex can help you.
Start with a codebase tour
Use Codex to get familiar with a complex codebase, which is especially useful when onboarding onto a repo for production software.
Modernize the codebase
Leverage Codex to plan tech stack migrations, upgrade your integration to the latest models if applicable, and refactor the codebase to improve readability and maintainability.
Upgrade your API integration
Use Codex to update your existing OpenAI API integration to the latest recommended models...
Refactor your codebase
Use Codex to remove dead code, untangle large files, collapse duplicated logic, and...
Run code migrations
Use Codex to map a legacy system to a new stack, land the move in milestones, and validate...
Codify repeatable work
Ask Codex to turn repo-specific workflows or checklists into a skill, so that all repo contributors can benefit from a standardized process.
Maintain system health
Let 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.
Kick off coding tasks from Slack
Mention `@Codex` in Slack to start a task tied to the right repo and environment, then...
Automate bug triage
Ask Codex to check recent alerts, issues, failed checks, logs, and chat reports, tune the...
Avoid the review bottleneck
Use Codex to automatically review PRs and run focused QA passes on critical flows, so you can catch issues quickly and ship updates confidently.