differential-review
Performs security-focused differential review of code changes. Adapts analysis depth to codebase size, uses git blame for context, calculates blast radius by counting callers, checks test coverage of modified code, and generates a markdown report. Use when reviewing a PR, commit, or diff for security vulnerabilities, checking whether a change re-introduces a previously fixed bug, asking what else a change could break, or finding which modified code has no test covering it.
Install
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Open your terminal
- Mac: Press ⌘ Space, type "Terminal", press Enter
- Windows: Press Win R, type "cmd", press Enter
Paste the command above and press Enter
Use the Copy command button, then paste in your terminal (Mac: ⌘V, Windows: Ctrl V).
Restart Claude Code
Close and reopen Claude Code, or start a new session, so it picks up the new skill.
Where it lives
Related skills
finishing-a-development-branch
Use when implementation is complete, all tests pass, and you need to decide how to integrate the work
requesting-code-review
Use when completing tasks, implementing major features, or before merging to verify work meets requirements
test-driven-development
Use when implementing any feature or bugfix, before writing implementation code
writing-plans
Use when you have a spec or requirements for a multi-step task, before touching code