Use this skill when you need to diagnose and fix React 19 performance issues (render churn, slow updates, Suspense/Transitions, memoization, profiling, and React Compiler).
Write clean, behavior-focused unit/integration tests that remain trustworthy when code is written or modified by agents (prevents “test weakening”, enforces invariants, and adds CI guardrails).
Use this skill when you are creating or updating Agent Skills in your project (structure, YAML frontmatter, naming, and progressive disclosure).
Use this skill when designing or refactoring boundaries, responsibilities, and change drivers using practical software architecture “hard parts” thinking + SRP.
Use this skill when you need a Bun runbook (dev, build, lint, typecheck, tests, migrations, and verification steps).
Use this skill when you need a thorough code hygiene pass (dead code, lint escapes, consistency, formatting drift, and subtle smells) on touched files.
Use this skill when you need a senior-level review of a PR/diff for security, correctness, performance, and maintainability (TypeScript + React 19 + Next.js 16).
Use this skill when you want fast, actionable critique of a file/snippet/approach (not necessarily a PR), focused on security, correctness, performance, and DX.