quality-assurance

Plan and write tests, fix flaky suites, and gate releases on quality. Covers the test pyramid (unit, integration, E2E), per-stack tools (Vitest, pytest, Playwright, Flutter test), coverage policy, flaky-test triage, and test plans. Use this skill whenever the user mentions tests, testing, test coverage, E2E, Playwright, Cypress, flaky tests, QA, load testing, or asks "how do I test this", even if they only say "this keeps breaking" about a suite. Not for writing features (see stack skills) or security audits (see security-review).