52 tagged skill tool, measured the same way as everything else here.
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Skill Claude CodeCodex
Use when the user wants to check test coverage, enforce 100% coverage, find uncovered code, add missing tests, or increase code coverage. Works with vitest, jest, react-scripts, and other test runners. Also for 'coverage', 'test coverage', 'cover', 'untested', 'uncovered', 'add tests for', 'increase coverage'…
Skill Claude CodeCodex
Detect, analyze, and fix flaky tests across any test runner. Use when tests intermittently fail in CI, tests pass locally but fail on CI, tests fail non-deterministically, or need to stabilize a flaky test suite. Also for 'flaky test', 'flaky', 'intermittent failure', 'unstable test', 'test flakiness', 'test retry'…
Skill Claude CodeCodex
Optimizes application performance across frontend, backend, queries, and databases. Use when performance requirements exist, when you suspect performance regressions, when Core Web Vitals or load times need improvement, when N+1 query patterns need fixing, or when profiling reveals bottlenecks.