Code review

Reviews a diff or pull request for correctness, security, tests and maintainability, and reports findings ranked by severity with concrete fixes. Use when the user asks for a code review, a second opinion on a change, or "is this safe to merge?".

Drafts a clear pull request title and description from the branch's commits and diff, with context, the change, how it was tested and risks. Use when the user opens a pull request or asks for a PR description.