Best Claude skills for testing in 2026

Scan a codebase for broken links — dead URLs in Markdown/HTML, broken file references, invalid import paths, stale anchor links, and broken cross-doc references — then auto-fix what it can: replace dead URLs with Wayback Machine archives, update moved file paths via git history, remove anchors that no longer exist, and flag what needs human review. Self-healing: learns fix patterns and improves over iterations. Use when: 'fix broken links', 'check links', 'dead links', 'broken urls', 'link rot', 'fix references', 'validate links', 'stale links', 'broken imports'.

Pre-deploy verification gate. Checks git status, build, tests, migrations, secrets, and commit conventions. Reports READY or NOT READY. Read-only, no changes. Trigger words: preflight, pre-deploy check, ready to deploy, deployment checklist.

Generate comprehensive unit tests with edge cases, error paths, and boundary values. Auto-detects test framework (Vitest, Jest, pytest, go test, flutter_test, RSpec, cargo test, JUnit), scans for untested functions by priority, adopts existing test conventions, generates tests with proper mocks, runs them, and self-heals failures in up to 3 iterations. Measures coverage before and after. Use when you need to add unit tests, increase code coverage, test edge cases, or verify error handling paths.

Automated WCAG 2.1 AA accessibility testing with axe-core and Lighthouse CI. Auto-detects frontend framework (React, Next.js, Vue, Angular, Svelte, Astro, Flutter, React Native), discovers all routes and interactive components, installs Playwright + axe-core for page-level scanning and jest-axe/vitest-axe for component-level testing. Generates tests for color contrast (4.5:1), alt text, form labels, ARIA attributes, heading order, landmark regions, focus visibility, keyboard navigation (tab order, focus traps, modal focus management, skip-to-content), screen reader compatibility (aria-live regions, error announcements, toast notifications), and Flutter Semantics validation (48dp touch targets, semanticLabel). Reports violations by severity (critical, serious, moderate, minor) with WCAG criterion references. Use when adding a11y testing, auditing accessibility compliance, fixing contrast issues, or validating keyboard and screen reader support.

Auto-detects any tech stack, generates and runs exhaustive end-to-end tests. Triggered by "end-to-end tests", "e2e tests", "integration tests", "test the whole app", "generate tests", "test coverage", "write e2e", "run e2e", "full test suite".

A comprehensive, automated code quality analysis tool that performs static analysis across multiple programming languages, identifies issues, security vulnerabilities, code smells, and duplications, and generates detailed, actionable reports to improve code \

Analyze game balance by extracting stats from code and running mathematical simulations. Calculates DPS tier lists, TTK matrices, EHP comparisons, and character power rankings. Stress-tests economy earn/spend rates, progression XP curves, and unlock pacing. Runs Monte Carlo simulations on drop rates, loot tables, and crafting RNG. Use when tuning weapon damage, checking if characters are overpowered, validating economy pacing, auditing gacha fairness, or testing PvP matchup balance.

Configure device matrix testing across real phones, tablets, and emulators. Sets up Firebase Test Lab, AWS Device Farm, or BrowserStack with smart device selection covering flagships to budget phones, test sharding for parallel execution, flaky test quarantine, and cross-device performance benchmarking. Use when you need to test on multiple devices, validate across screen sizes, catch device-specific bugs, or benchmark performance on low-end hardware.

Generates a manual test plan, QA plan, test scenarios, testing checklist, or guidance on how to test changes. Works from branch diffs, stories, specs, or requirements.

Analyze and score test coverage across all testing dimensions -- unit, integration, E2E, load, visual regression, contract, and accessibility. Auto-detects tech stack and test infrastructure, runs existing coverage tools, identifies gaps by category, scores each on a 0-10 scale with weighted overall health, and produces a prioritized remediation plan routing to the right testing sub-skill. Use when you need a test health overview, want to find coverage gaps, need to prioritize which tests to write next, or want to assess test quality before a release.