Testing Claude Skills
3 546 testing skills from 425 authors. They run test suites, check accessibility and catch what broke. Half of them fit into 1 796 tokens or less — that is what one costs your context window when the agent loads it. 405 ship runnable scripts rather than instructions alone. 2 of them cannot work without an MCP server, most often rube. We also found 403 copies of these same skills sitting in other people's repositories — counted once here, not 403 times.
3 546 unique 425 authors 2 161 updated this month 331 from vendors
Python testing skill using pytest, covering fixtures, parametrize, markers, conftest, plugins, mocking, and advanced testing patterns.
Validating A/B test implementations including traffic splitting accuracy, statistical significance calculation, metric tracking, and experiment cleanup.
American Fuzzy Lop Plus Plus mutation-based fuzz testing for finding crashes, hangs, and security vulnerabilities in binary programs.
Comprehensive WCAG 2.1 AA compliance testing combining automated axe-core scans with manual keyboard navigation, screen reader compatibility, and focus management verification
Comprehensive evaluation patterns for AI agents including multi-turn conversation testing, LLM-as-judge frameworks, benchmark suites, regression detection, and systematic eval pipelines for measuring agent quality and safety.
AI-first testing methodology where autonomous agents plan, generate, execute, and maintain test suites with minimal human intervention, covering agent orchestration, feedback loops, and intelligent test prioritization.
Testing machine learning models including accuracy validation, bias detection, drift monitoring, A/B testing, and model regression testing.
Testing monitoring and alerting configurations including threshold validation, alert routing, escalation policies, and false-positive rate monitoring.
Systematic patterns for prompting AI coding agents to generate high-quality tests including prompt engineering for test creation, coverage-driven generation, mutation-aware testing, and review checklists for AI-generated test code.
AI-powered test orchestration skill covering intelligent test selection, risk-based test prioritization, flaky test management, test impact analysis, parallel execution optimization, and predictive test failure detection using machine learning.
Angular application testing with TestBed, component harness, service testing, directive testing, and Angular-specific testing utilities.
Testing API rate limiting implementations including throttling behavior, burst handling, rate limit headers, and distributed rate limiting patterns.
API gateway testing skill covering rate limiting validation, request routing, authentication proxy testing, load balancing verification, circuit breaker testing, and gateway configuration validation for Kong, Envoy, and AWS API Gateway.
Automated detection of breaking API changes including response format changes, removed endpoints, type changes, and deprecation enforcement.
Comprehensive API security testing based on OWASP API Security Top 10 including broken authentication, injection attacks, rate limiting, BOLA/BFLA vulnerabilities, and automated security scanning with ZAP and custom scripts.
Testing API schema evolution patterns including additive changes, field deprecation, type widening, and backward-compatible migration strategies.
Automatically generate comprehensive API test suites from OpenAPI specifications covering CRUD operations, error handling, authentication, pagination, and edge cases
Comprehensive RESTful API testing patterns covering HTTP methods, status codes, request/response validation, authentication, error handling, and contract testing.
Approval testing methodology using ApprovalTests library for verifying complex outputs against human-approved results with diff-based review.
Testing augmented and virtual reality applications including spatial tracking, gesture recognition, performance on headsets, and motion sickness testing.
Mobile application testing skill using Appium for iOS and Android, covering device capabilities, selectors, gestures, and cross-platform testing strategies.
Testing API versioning strategies including URL path, header, and query parameter versioning with backward compatibility validation.
Modern cloud-scale load testing using Artillery.io for HTTP, WebSocket, Socket.io, and custom protocol testing with YAML-based test definitions.
Write and run Artillery load tests with YAML phases and scenarios, CSV data payloads, the expect plugin for functional checks, and ensure thresholds that fail CI when latency or error budgets are breached.
Comprehensive authentication testing including login flows, password policies, MFA, session management, account lockout, and SSO integration.
Comprehensive authentication and authorization bypass testing including session hijacking, privilege escalation, JWT manipulation, and access control verification
Role-based and attribute-based access control testing including permission matrices, privilege escalation prevention, and resource-level authorization.
Behavior-Driven Development with Gherkin syntax, step definitions, scenario outlines, data tables, and living documentation generation.
Accessibility testing skill using axe-core and Playwright for automated WCAG 2.1 compliance auditing, custom rules, and accessibility reporting.
PHP BDD testing with Behat framework using Gherkin feature files, Mink browser extension, context classes, and Symfony integration for behavior-driven acceptance testing.
Smart contract testing with Hardhat, Foundry, and Brownie including unit tests, gas optimization, reentrancy checks, and fork testing.
Python BDD testing with Behave framework using Gherkin feature files, step definitions, environment hooks, and Selenium integration for behavior-driven acceptance testing.
Teach agents to use AI browser agents for exploratory and smoke QA with step budgets, evidence-based assertions, guardrails, and Playwright conversion.
Generate boundary value test cases for numeric ranges, string lengths, date ranges, collection sizes, and domain-specific constraints using systematic analysis techniques
Testing browser extensions including content script injection, background worker testing, popup UI testing, storage API testing, and cross-browser compatibility.
Cloud-based cross-browser and cross-device testing with BrowserStack including Automate, App Automate, Percy visual testing, Observability, and integration with Playwright, Selenium, and CI/CD pipelines.
Fuzz testing for Rust applications using cargo-fuzz and libFuzzer to discover memory safety issues, panics, and undefined behavior.
Fast test execution with Bun's built-in test runner including snapshot testing, mocking, code coverage, lifecycle hooks, DOM testing with happy-dom, and migration from Jest and Vitest to Bun test.
Web application security testing using BurpSuite for proxy-based interception, scanning, and manual penetration testing of web applications.
Canary deployment validation testing including traffic splitting, metric comparison, automatic rollback triggers, and health score calculation.
Testing CDN configurations, cache hit ratios, cache invalidation, TTL policies, and edge caching behavior for optimal content delivery.
Expert-level Capybara acceptance testing skill for Ruby and Rails applications. Covers RSpec integration, DSL methods, scoping, Page Objects with SitePrism, JavaScript interactions, and database cleaning strategies.
Map changelog entries and release notes to affected test cases, ensuring every user-facing change has corresponding test coverage verification.
Advanced chaos engineering patterns using Chaos Monkey, Litmus, and Gremlin for testing distributed system resilience under failure conditions.
Chaos testing for Kubernetes workloads using Chaos Mesh, Litmus, and custom fault injection for pod, network, and disk failures.
Teach agents to shard and parallelize Playwright, Jest, and pytest suites in CI to reduce wall-clock time while merging reports reliably.
Teach agents to use the Chrome DevTools MCP server for performance testing with traces, Core Web Vitals, throttling, and evidence-based analysis.
Measure and enforce test coverage with Istanbul/nyc, c8, Jest, and Vitest. Covers branch versus line coverage, per-directory thresholds, CI gates, and correctly excluding generated code from reports.