Claude Skills
The open format is called Agent Skills and works in Claude Code, Codex, Cursor and other agents — most people know it as Claude Skills.
Every Agent Skill we could find on GitHub, deduplicated by content. 80 149 files from 1 774 authors, of which 62 489 are unique — the rest is the same skill repackaged into someone else's repository. For each one: what it weighs in tokens, whether it ships runnable scripts, and which MCP servers it needs.
Consumer-driven contract testing for microservices using Pact, ensuring API compatibility and preventing integration breakages across service boundaries.
Systematic memory profiling and leak detection in applications using heap snapshots, allocation tracking, and garbage collection analysis.
Accessibility testing for mobile apps including VoiceOver/TalkBack testing, touch target sizes, dynamic type support, and motor accessibility.
Scalable mobile testing using cloud device farms like AWS Device Farm, BrowserStack, and Firebase Test Lab for cross-device compatibility.
Mobile application performance testing including app launch time, frame rendering, memory profiling, battery consumption, network throttling, and crash analytics using Appium, XCTest, and Espresso with real device testing.
Test touch gestures including swipe, pinch-to-zoom, long press, and drag-and-drop on mobile viewports and touch-enabled devices.
Comprehensive Mocha testing skill for writing robust unit and integration tests in JavaScript and TypeScript with Chai assertions, Sinon mocking, async patterns, and CI/CD integration.
MongoDB testing with in-memory MongoDB, aggregation pipeline testing, schema validation, indexing verification, and replica set testing.
Microsoft's built-in .NET testing framework covering test classes, data-driven tests, assertions, lifecycle management, mocking with Moq, and integration testing for C# applications.
API mocking with Mock Service Worker for browser and Node.js environments including request interception, response simulation, and network error testing.
Mock Service Worker v2 patterns - http and graphql request handlers, setupServer for Node test runs, setupWorker for the browser, per-test handler overrides, and strict unhandled-request policies.
Testing multi-tenant application isolation including data segregation, tenant-specific configuration, cross-tenant access prevention, and performance isolation.
Generate and run mutation tests to measure test suite effectiveness by introducing code mutations and verifying detection rates.
Advanced mutation testing using Stryker, PIT, and mutmut to measure test suite quality by introducing controlled mutations and tracking kill rates.
Run mutation testing with StrykerJS for TypeScript/JavaScript and mutmut for Python to measure whether your test suite actually catches bugs, enforce mutation score thresholds, and keep runs fast with incremental mode in CI.
Detect and eliminate N+1 query problems in database-backed applications through query counting, execution plan analysis, and ORM configuration auditing
Comprehensive Nemo.js test automation skill for PayPal's Selenium-based Node.js testing framework featuring view-driven locators, flexible configuration, Mocha integration, and scalable browser automation patterns.
Systematically generate negative test cases covering invalid inputs, unauthorized actions, missing required fields, exceeded limits, and malformed request payloads
NestJS application testing with @nestjs/testing, dependency injection mocking, e2e testing with supertest, guard testing, and pipe validation testing.
Network latency simulation and testing for measuring application behavior under various network conditions including high latency, packet loss, and bandwidth constraints.
Next.js application testing covering Server Components, App Router, API routes, middleware, dynamic routes, and SSR/SSG testing patterns.
Comprehensive NightwatchJS end-to-end testing skill with integrated Selenium WebDriver, built-in assertions, page objects, and parallel test execution for reliable browser automation in JavaScript and TypeScript.
Test notification systems for spam behavior including duplicate alerts, missing throttling, incorrect delivery channels, and notification preference violations
HTTP request mocking with Nock for Node.js testing including request intercepting, response recording, and external API simulation.
Teach agents to run Nuclei DAST and API security scans in CI, write templates, and gate builds on actionable findings.
NUnit 3 constraint-based testing for C# covering Assert.That patterns, parameterized tests, setup/teardown, Moq mocking, test categories, and the fluent assertion model.
Security testing for OAuth2 implementations including authorization code flow, PKCE, token handling, redirect URI validation, and scope enforcement.
Grade LLM and agent traces with OpenAI Evals - build datasets, configure string/python/model graders, run eval suites, and gate agent behavior changes in CI.
Validate progressive web app offline functionality including service worker caching, offline data persistence, sync-on-reconnect behavior, and graceful degradation
Automatically generating API tests from OpenAPI/Swagger specifications including request validation, response schema checking, and edge case generation.
Testing distributed tracing and observability instrumentation with OpenTelemetry including span verification, metric collection, and log correlation.
OpenAPI/Swagger specification validation and testing to ensure API implementations match their documented contracts with automated drift detection.
Security testing skill based on OWASP Top 10, covering ZAP scanning, security headers, input validation, authentication, and authorization testing.
Integration with Google OSS-Fuzz for continuous fuzzing of open-source projects with automated bug filing and regression tracking.
Teach agents to automate accessibility testing in CI with pa11y and pa11y-ci, including thresholds, sitemap crawling, GitHub Actions gating, and WCAG rule tuning.
Analyze page load performance using Core Web Vitals, Lighthouse scores, resource waterfall analysis, and performance budgets with automated regression detection.
Testing pagination implementations including cursor-based, offset-based, keyset pagination with edge cases, performance, and consistency verification.
Generate optimized test combinations using pairwise (all-pairs) testing algorithms to achieve maximum coverage with minimum test cases across multiple input parameters
Payment gateway testing including Stripe, PayPal, and Square integration testing with sandbox environments, webhook verification, and error handling.
Testing PCI-DSS compliance for payment processing including encryption validation, access control testing, and secure data storage verification.
Testing PDF generation including layout verification, content accuracy, font embedding, accessibility (PDF/UA), and cross-platform rendering consistency.
Catch UI regressions with Percy visual testing, snapshot strategy, Playwright and Cypress integration, responsive widths, dynamic-content stabilization, review workflow discipline, and CI gating without approval fatigue.
Enforcing performance budgets in CI/CD including bundle size limits, load time thresholds, Lighthouse score gates, and resource count limits.
Generate realistic performance test scenarios with load profiles, ramp-up patterns, think times, and acceptance criteria derived from production traffic analysis
>- Use when creating, reviewing, or styling charts, graphs, dashboards, sparklines, or any data visualization. Applies to Recharts, ECharts, Chart.js, matplotlib, Plotly, seaborn, D3.js, and SVG. Enforces Tufte principles (data-ink ratio, direct labeling, range-frame axes) plus modern screen-first standards (accessibility, responsive, dark mode).
Comprehensive PHP testing with PHPUnit covering assertions, data providers, mocking, test doubles, database testing, and HTTP testing for reliable PHP application development.
Testing CI/CD pipeline configurations including build validation, deployment verification, rollback testing, and pipeline-as-code quality checks.
Enterprise-grade Playwright test automation framework using 8-layer architecture with Page Object Model, Module Pattern, custom fixtures, API testing layer, structured logging, data generators, multi-browser support, Docker, CI/CD pipelines, and custom HTML reporting.
Testing patterns for Playwright AI-powered agents including the Planner, Generator, and Healer architecture for self-healing test automation, intelligent test generation, and adaptive test execution strategies.
API testing skill using Playwright's built-in APIRequestContext for RESTful service validation, authentication flows, and API contract verification.
Teach AI coding agents to use the Playwright CLI and debug loop efficiently with last-failed runs, locator probing, trace evidence, and safe healing.
CLI-first browser automation using Playwright CLI for navigation, form filling, snapshots, screenshots, data extraction, and UI-flow debugging from the terminal.
Command-line browser automation with Playwright CLI for navigation, snapshots, uploads, downloads, tracing, and QA workflows.
Comprehensive end-to-end testing skill using Playwright for web applications, covering page objects, selectors, assertions, waits, fixtures, and test organization.
Teaches the agent to build resilient Playwright locators with .filter (hasText/has/hasNot), narrow lists, and reason correctly about visibility, waitFor states, and timeouts.
Mobile web testing skill using Playwright device emulation covering responsive testing, touch interactions, viewport management, network throttling, geolocation testing, and mobile-specific UI patterns.
Teaches the agent to handle popups, new tabs, and multiple browser windows in Playwright using waitForEvent('page'), context pages, and reliable tab switching for OAuth and target=_blank links.
Network-level testing with Playwright including request interception, response mocking, network throttling, and HAR recording/replay.
Teaches the agent when and how to use page.evaluate, evaluateHandle, and exposeFunction in Playwright — passing arguments safely, reading DOM/JS state, and why locators should be preferred for actions.
Advanced Playwright automation with auto-detection, custom fixtures, trace debugging, visual testing, mobile emulation, and production-grade test architecture.
Claude Skills — questions
Answers built from the skills we actually parsed.