Skill★ Featured
Systematic Debugging
Identify and resolve the root causes of errors in complex systems using a methodical and documented approach.
Testing & QA247,389
Claude DirectorySkillsHub MCP
Write, run and maintain tests: unit, integration, end-to-end and QA automation to keep Claude-built software reliable.
312 items in this category.
312 items
Identify and resolve the root causes of errors in complex systems using a methodical and documented approach.
Use when implementing any feature or bugfix, before writing implementation code
Bun runtime helper for Claude Code. Run scripts, manage dependencies with bun install, execute tests with bun test, and migrate Node.js projects to Bun with guided codemods.
Official Microsoft Playwright MCP server for browser automation, web scraping, testing, and accessibility snapshots
Browser automation and end-to-end testing by Microsoft. Enables Claude to interact with web pages, take screenshots, fill forms, click elements, and perform automated browser testing workflows across Chromium, Firefox, and WebKit.
Chrome browser testing and performance analysis using Chrome DevTools Protocol (CDP). 27 professional-grade tools for web testing, performance measurement, accessibility validation, and browser automation.
Comprehensive toolkit for developing Claude Code plugins with 8-phase guided workflow and 7 expert skills. Includes plugin scaffolding, manifest validation, testing tools, and publishing assistance for creating production-ready plugins.
End-to-end testing specialist using Vercel Agent Browser (preferred) with Playwright fallback. Use PROACTIVELY for generating, maintaining, and running E2E tests. Manages test journeys, quarantines flaky tests, uploads artifacts (screenshots, videos, traces), and ensures critical user flows work.
GAN Harness — Evaluator agent. Tests the live running application via Playwright, scores against rubric, and provides actionable feedback to the Generator.
Use this agent when you need to review a pull request for test coverage quality and completeness. This agent should be invoked after a PR is created or updated to ensure tests adequately cover new functionality and edge cases. Typical triggers include the user asking whether tests on a freshly-created PR are thorough, an updated PR adding new logic that needs coverage analysis, and a final pre-merge double-check before marking a PR ready. See "When to invoke" in the agent body for worked scenarios.
Extracts behavioral specs from existing codebases for OpenSpec. Produces flat Requirement and Invariant blocks with structured metadata (entities, enforced, id, test anchors). Outputs openspec/specs/<capability>/spec.md. Fully self-bootstrapping — no dependency on codebase-onboarding. Use when onboarding a brownfield project to spec-driven development.
Test-Driven Development specialist enforcing write-tests-first methodology. Use PROACTIVELY when writing new features, fixing bugs, or refactoring code. Ensures 80%+ test coverage.
Interactive CLI testing specialist using tmux for session management
Expert in Rust testing strategies, test organization, unit tests, property testing, and test quality. Use proactively to improve test coverage and quality.
Verification strategy, evidence-based completion checks, test adequacy
Meticulous QA subagent for test planning, bug hunting, edge-case analysis, and implementation verification.
Expert assistant for web accessibility (WCAG 2.1/2.2), inclusive UX, and a11y testing
This custom agent uses Amplitude's MCP tools to deploy new experiments inside of Amplitude, enabling seamless variant testing capabilities and rollout of product features.
Expert agent for integrating Apify Actors into codebases. Handles Actor selection, workflow design, implementation across JavaScript/TypeScript and Python, testing, and production-ready deployment.
Essential prompts, instructions, and chat modes for C# and .NET development including testing, documentation, and best practices.
I play the devil's advocate to challenge and stress-test your ideas by finding flaws, risks, and edge cases
DevOps specialist following the infinity loop principle (Plan → Code → Build → Test → Release → Deploy → Operate → Monitor) with focus on automation, collaboration, and continuous improvement
Expert Vue.js frontend engineer specializing in Vue 3 Composition API, reactivity, state management, testing, and performance with TypeScript
Automates E2E scenarios with Chrome DevTools MCP, Playwright, Agent Browser. UI/UX validation using browser automation tools and visual verification techniques