OpenAI's coding agent. It runs as an open-source CLI, an IDE extension, inside the ChatGPT desktop app, and as Codex Cloud, which works on GitHub repos in its own cloud workspace. Developers use it to explore code, build features, fix bugs and review pull requests.
You have a folder of interlinked markdown pages with an index and a change log, built from your sources, that you can read in Obsidian and query through the agent, with every change reviewable in git.
You have a docs/architecture.md that names the entry points, modules and data flow with file references, a list of open questions, and a short instruction file with the build and test commands.
Your folder is sorted into a small set of named subfolders, nothing is deleted, and you have a log of every move that you can reverse.
You get a table of the console errors and failed requests on each route you named, a small fix for each one, and proof from a reload that the error is gone.
You get a short root cause note backed by the stack trace and code, a failing test that reproduces the error, a small fix that makes it pass, and a local branch ready for your review.
Each chosen issue gets a pull request with a passing test run that you review, ask to change, merge or close. You stay in control of every merge.
The repo runs on the new version on a branch of small commits, the full test suite passes with no tests removed, and you have a list of behaviour changes to check in staging.