Diagnose and fix bugs
Find the root cause of broken behavior, reproduce it, fix it with regression coverage, and use browser or performance diagnostics when evidence requires them.
Skills 9 in the ChatGPT listing
Browser testing with devtools Tests in real browsers via Chrome DevTools MCP. Codebase Design Shared vocabulary for designing deep modules. Debugging and error recovery Guides systematic root-cause debugging. Diagnosing Bugs Diagnosis loop for hard bugs and performance regressions. Entry debug Use whenever the Debug plugin is selected. Performance optimization Optimizes application performance across frontend, backend, queries, and databases. Resolving Merge Conflicts Use when you need to resolve an in-progress git merge/rebase conflict. TDD Test-driven development. Test driven development Drives development with tests using the red-green-refactor loop. 