2,373 free skills
Skills for writing and running tests — framework-specific patterns for Jest, Vitest, pytest, Go testing, RSpec, JUnit, Playwright, Cypress, and more.
Sourced from real, public repositories — synced daily, never invented.
15 tools across six categories
13 of them never send your data anywhere
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qa-selenium-java-writer
azanir/qa-skills
Generate Selenium Java E2E tests with JUnit 5, Page Object Model, explicit waits, AssertJ assertions, and Allure reporting integration.
playwright-cli
appautomaton/webmaton
Use when a task needs Playwright-backed browser automation from the shell: open or attach to browser sessions, inspect snapshots and element refs, click/type/fill forms, debug Playwright tests, inspect console/network/storage, run Playwright snippets, capture screenshots/traces/videos, or generate reliable test code. Prefer for repeatable browser workflows and Playwright test work; not for static HTTP fetches, JSON APIs, or simple web search.
agent-browser
halt-catch-fire/superpowers
Browser automation for AI agents via inference.sh. Navigate web pages, interact with elements using @e refs, take screenshots, record video. Capabilities: web scraping, form filling, clicking, typing, drag-drop, file upload, JavaScript execution. Use for: web automation, data extraction, testing, agent browsing, research. Triggers: browser, web automation, scrape, navigate, click, fill form, screenshot, browse web, playwright, headless browser, web agent, surf internet, record video
typescript
mrsombre/typescript-skills
Configure modern TypeScript project structure, tsconfig.json, runtime targets, pnpm, package version management, Biome, Vitest, build outputs, CI, EditorConfig, and agent hooks. Use when scaffolding or auditing TypeScript apps, packages, CLIs, GitHub Actions, Node/Bun/browser/serverless projects, workspaces, dependency updates, linting/formatting/testing, scripts, builds, or post-edit hooks.
returns-analysis
anthropics/financial-services-plugins
Build quick IRR/MOIC sensitivity tables for PE deal evaluation. Models returns across entry multiple, leverage, exit multiple, growth, and hold period scenarios. Use when sizing up a deal, stress-testing assumptions, or preparing IC returns exhibits. Triggers on "returns analysis", "IRR sensitivity", "MOIC table", "what's the return at", "model the returns", or "back of the envelope".
testing-mastracode-tui
mastra-ai/mastra
Testing mastracode TUI features interactively in Konsole. Covers model configuration, thread lifecycle, task state isolation, and common blockers.
flask
microsoft/debugpy
Best practices for Flask web development including routing, blueprints, and testing.
aspire
microsoft/aspire
Use this skill when the user is working with an Aspire distributed application and needs to operate the AppHost or its resources through the Aspire CLI: start, restart, stop, or wait on the app; work through code/resource changes with watch, rebuild, hot reload, or resource commands; inspect resources, logs, traces, docs, or health; add integrations; manage secrets or config; publish, deploy, or rerun a named pipeline step; initialize Aspire in an existing app; recover missing `.modules` files in a TypeScript AppHost; discover the right frontend URL for Playwright from Aspire state; expose custom dashboard/resource commands; or understand unfamiliar Aspire AppHost APIs in C# or TypeScript. Use it even if they describe the task in terms of an AppHost, resources, dashboard, existing app bootstrap, missing generated modules, Playwright URL discovery, C# API understanding, or local distributed app workflow without explicitly naming Aspire. Do not use it for non-Aspire .NET apps, container-only repos with no AppHost, or ordinary build and test tasks.
returns-analysis
anthropics/financial-services
Build quick IRR/MOIC sensitivity tables for PE deal evaluation. Models returns across entry multiple, leverage, exit multiple, growth, and hold period scenarios. Use when sizing up a deal, stress-testing assumptions, or preparing IC returns exhibits. Triggers on "returns analysis", "IRR sensitivity", "MOIC table", "what's the return at", "model the returns", or "back of the envelope".
llm-council
pedronauck/skills
Run any question, idea, or decision through a council of 5 AI advisors who independently analyze it, peer-review each other anonymously, and synthesize a final verdict. Based on Karpathy's LLM Council methodology. MANDATORY TRIGGERS: 'council this', 'run the council', 'war room this', 'pressure-test this', 'stress-test this', 'debate this'. STRONG TRIGGERS (use when combined with a real decision or tradeoff): 'should I X or Y', 'which option', 'what would you do', 'is this the right move', 'validate this', 'get multiple perspectives', 'I can't decide', 'I'm torn between'. Do NOT trigger on simple yes/no questions, factual lookups, or casual 'should I' without a meaningful tradeoff (e.g. 'should I use markdown' is not a council question). DO trigger when the user presents a genuine decision with stakes, multiple options, and context that suggests they want it pressure-tested from multiple angles.
front-end-testing
citypaul/dotfiles
Behavior-driven UI testing patterns. Covers Vitest Browser Mode (preferred) and DOM Testing Library. Use when testing any front-end application, writing UI tests, querying DOM elements, or simulating user interactions. For React-specific patterns, see the react-testing skill.
webapp-testing
dedalus-erp-pas/foundation-skills
Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.
bun-development
hainamchung/agent-assistant
Modern JavaScript/TypeScript development with Bun runtime. Covers package management, bundling, testing, and migration from Node.js. Use when working with Bun, optimizing JS/TS development speed, or migrating from Node.js to Bun.
django-pro
davila7/claude-code-templates
Master Django 5.x with async views, DRF, Celery, and Django Channels. Build scalable web applications with proper architecture, testing, and deployment.
spring
doanchienthangdev/omgkit
Enterprise Spring Boot development with JPA, security, testing, and microservices patterns
terraform-engineer
hainamchung/agent-assistant
Use when implementing infrastructure as code with Terraform across AWS, Azure, or GCP. Invoke for module development, state management, provider configuration, multi-environment workflows, infrastructure testing.
golang-testcontainers
baotoq/agent-skills
Write integration tests in Go using testcontainers-go with real databases, caches, and message queues in Docker containers. Covers PostgreSQL, MySQL, Redis, RabbitMQ, Kafka, and custom containers with idiomatic Go testing patterns.
dbt-testing
kilo-org/kilo-marketplace
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@1247/web-crawler
starchild-ai-agent/community-skills
Headless browser for web crawling, UX audits, screenshots, and interaction testing. Use when the user wants to audit a website, take screenshots, click buttons, test UX flows, extract content from SPAs, or crawl pages that require JavaScript rendering.
boxlang-runtime-google-cloud-functions
ortus-boxlang/skills
Use this skill when building, testing, or deploying BoxLang applications on Google Cloud Functions Gen 2, including handler structure, FunctionRunner entry point, URI routing, environment variables, local development with the GCF invoker, and debugging.
flutter-windows-ui-testing
iml1s/flutter-claude-skills
Automate testing of Flutter Windows desktop apps via Win32 API (user32.dll). Use when visually verifying Flutter desktop UI — clicking buttons, opening popups, navigating pages, taking screenshots. Triggers on keywords like "test Windows app", "UI test desktop", "click Flutter window", "Windows 桌面測試", "自動化測試", "截圖驗證", "visual verification desktop".
flightplanner
endorhq/flightplanner
Framework-agnostic E2E testing principles, spec-driven test generation, and maintenance workflows
review-and-test
shopify/flash-list
Review a FlashList PR or branch, run unit tests, test on iOS simulator, and verify RTL/LTR behavior. Shared context with fix-github-issue skill.
python-executor
halt-catch-fire/superpowers
Execute Python code in a safe sandboxed environment via [inference.sh](https://inference.sh). Pre-installed: NumPy, Pandas, Matplotlib, requests, BeautifulSoup, Selenium, Playwright, MoviePy, Pillow, OpenCV, trimesh, and 100+ more libraries. Use for: data processing, web scraping, image manipulation, video creation, 3D model processing, PDF generation, API calls, automation scripts. Triggers: python, execute code, run script, web scraping, data analysis, image processing, video editing, 3D models, automation, pandas, matplotlib
youtube-thumbnail-design
halt-catch-fire/superpowers
YouTube thumbnail design with specific dimensions, contrast rules, and mobile preview optimization. Covers safe zones, text placement, face expression psychology, and A/B testing. Use for: YouTube thumbnails, video cover images, click-through optimization. Triggers: youtube thumbnail, thumbnail design, video thumbnail, click through rate, ctr optimization, youtube cover, video cover image, thumbnail maker, thumbnail tips, youtube design, video preview image
winapp-package
microsoft/winappcli
Package a Windows app as an MSIX installer for distribution or testing. Use when creating a Windows installer, packaging an Electron/Flutter/.NET/Rust/C++/Tauri app for Windows, building an MSIX, distributing a desktop app, packaging a console app or CLI tool, or adding MSIX packaging to a build script or CI/CD pipeline.
frontend-app-builder
openai/plugins
Use for new frontend applications, dashboards, games, creative websites, hero sections, and visually driven UI from scratch, or when the user explicitly asks for a redesign/restyle/modernization. Builds from clean, airy, high-taste, readable image-generated concept design with section-specific references, faithful implementation, and browser testing.
moai-workflow-testing
modu-ai/cc-plugins
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dev-architecture-playbook
majiayu000/spellbook
Route full software-development architecture work from product intent through design, implementation, testing, release, and operations. Use when the user asks for a complete development architecture, wants to know which Spellbook skills to combine, needs an execution path across PRD/spec/API/data/security/performance/release/SRE, or asks to turn an idea or repo into a production-ready engineering plan.
app-user-story-qa
majiayu000/spellbook
End-to-end app feature inventory and user-story testing workflow with a canonical tracker. Use when the user asks to audit every feature, derive expected behavior from code, test user journeys, or explicitly fix and retest documented UX or logistical defects.
elixir-best-practices
largelanguageplatform/agent-skills
Guiding principles and patterns for writing idiomatic Elixir and Phoenix applications. Covers OTP design, Ecto usage, pattern matching, supervision trees, LiveView, testing with ExUnit, and deployment best practices.
golang-pro
baotoq/agent-skills
Implements concurrent Go patterns using goroutines and channels, designs and builds microservices with gRPC or REST, optimizes Go application performance with pprof, and enforces idiomatic Go with generics, interfaces, and robust error handling. Use when building Go applications requiring concurrent programming, microservices architecture, or high-performance systems. Invoke for goroutines, channels, Go generics, gRPC integration, CLI tools, benchmarks, or table-driven testing.
ruby-pro
herdiansah/antigravity-skills-master
Write idiomatic Ruby code with metaprogramming, Rails patterns, and performance optimization. Specializes in Ruby on Rails, gem development, and testing frameworks. Use PROACTIVELY for Ruby refactoring, optimization, or complex Ruby features.
rails-testing
etewiah/property_web_builder
Help with Rails testing including unit tests, integration tests, fixtures, and debugging test failures. Use when working on tests or debugging test issues.
spring-application-code-style
rotilho/skills
Apply Spring Boot application-layer conventions for package structure, controllers, services, repositories, transactions, configuration properties, bean wiring, observability, and integration testing. Use when the user wants Spring application structure or Spring application architecture and wiring guidance, including coroutine or Flow usage inside Spring-managed code, especially for WebFlux or coroutine-first services, not shared libraries or framework internals. When this skill loads, also load `code-practice` as the shared engineering base layer.
scrapeless-scraping-browser
scrapeless-ai/scraping-browser-skill
Cloud browser automation CLI for AI agents powered by Scrapeless. Use when the user needs to interact with websites using cloud browsers, including navigating pages, filling forms, clicking buttons, taking screenshots, extracting data, testing web apps, or automating any browser task with residential proxies and anti-detection features. Triggers include requests to "open a website", "fill out a form", "click a button", "take a screenshot", "scrape data from a page", "test this web app", "use a proxy", "bypass detection", or any task requiring cloud browser automation.
kotlin-code-style
rotilho/skills
Apply Kotlin-specific code style and design guidance for Kotlin implementation and review: feature-owned file and type organization, helper and extension placement, type design, constructors, nullability, serialization, coroutines, Flow, mutable state ownership, and Kotlin unit/integration test style outside Cucumber or BDD. Use when writing or changing Kotlin code unless Spring application architecture or Cucumber/BDD is the main concern. When this skill loads, also load `code-practice` as the shared engineering base layer.
android-pentesting-tricks
strivepan-svg/hack-skills
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forge-harden-dx
tinyorbit-ai/skills
Plan-time developer-experience review (DX lead persona) for dev-facing builds. Audits API/CLI ergonomics, naming, error-message intent, setup friction, the first five-minute experience, and which docs surface the plan obliges — BEFORE implementation. Three modes — EXPANSION (competitive bar), POLISH (every touchpoint), TRIAGE (critical gaps only). Use when plan ships a library / API / CLI / SDK, when asked to "DX-review the plan", "plan-time DX audit", or via forge-harden orchestration. For runtime DX testing of the built thing, see forge-dx.
rust-testing
angelmic/everything-claude-code-ios
Rust testing patterns including unit tests, integration tests, async testing, property-based testing, mocking, and coverage. Follows TDD methodology.
pytest-gen
github/copilot-cli-for-beginners
Generate comprehensive pytest tests - use when generating tests, creating test suites, or testing Python code
book-cover-design
inference-sh/skills
Book cover design with genre-specific conventions, typography rules, and AI image generation. Covers fiction and non-fiction genres, sizing, thumbnail testing, and iteration workflows. Use for: self-publishing, ebook covers, print covers, audiobook covers, cover mockups. Triggers: book cover, cover design, ebook cover, book art, novel cover, self publishing cover, kindle cover, audiobook cover, book jacket, cover illustration, fiction cover, nonfiction cover
react-native-testing
callstackincubator/agent-skills
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langsmith-observability
firecrawl/ai-research-skills
LLM observability platform for tracing, evaluation, and monitoring. Use when debugging LLM applications, evaluating model outputs against datasets, monitoring production systems, or building systematic testing pipelines for AI applications.
pyvene-interventions
firecrawl/ai-research-skills
Provides guidance for performing causal interventions on PyTorch models using pyvene's declarative intervention framework. Use when conducting causal tracing, activation patching, interchange intervention training, or testing causal hypotheses about model behavior.
evaluating-code-models
firecrawl/ai-research-skills
Evaluates code generation models across HumanEval, MBPP, MultiPL-E, and 15+ benchmarks with pass@k metrics. Use when benchmarking code models, comparing coding abilities, testing multi-language support, or measuring code generation quality. Industry standard from BigCode Project used by HuggingFace leaderboards.
csharp-pro
davila7/claude-code-templates
Write modern C# code with advanced features like records, pattern matching, and async/await. Optimizes .NET applications, implements enterprise patterns, and ensures comprehensive testing.
post-implementation-review
epicenterhq/epicenter
Hub for the broad second-read pass after an implementation: list every touched file as an ASCII tree, mentally inline helpers, audit dead paths and stale imports, name invariant owners, sanity-check API shape and naming. Delegates to focused skills (collapse-pass, cohesive-clean-breaks, greenfield-clean-breaks, refactoring, code-audit, one-sentence-test, approachability-audit, testing, typescript, svelte, yjs). Use after finishing an implementation, before handoff, or when the user says 'review what you just did', 'second pass', 'final sweep'.
nw-pbt-jvm
nwave-ai/nwave
JVM property-based testing with jqwik, ScalaCheck, and ZIO Test frameworks
nw-pbt-erlang-elixir
nwave-ai/nwave
Erlang/Elixir property-based testing with PropEr, PropCheck, and StreamData frameworks
golang-pro
christopheralphonse/calphonse-skills
Implements concurrent Go patterns using goroutines and channels, designs and builds microservices with gRPC or REST, optimizes Go application performance with pprof, and enforces idiomatic Go with generics, interfaces, and robust error handling. Use when building Go applications requiring concurrent programming, microservices architecture, or high-performance systems. Invoke for goroutines, channels, Go generics, gRPC integration, CLI tools, benchmarks, or table-driven testing.
ruby-pro
davila7/claude-code-templates
Write idiomatic Ruby code with metaprogramming, Rails patterns, and performance optimization. Specializes in Ruby on Rails, gem development, and testing frameworks.
ruby-patterns
softspark/ai-toolkit
Ruby/Rails: blocks, metaprogramming, ActiveRecord, Sidekiq, RSpec, Sorbet, Hanami. Triggers: Ruby, Rails, ActiveRecord, Sidekiq, RSpec, Gemfile, bundler, Hanami, Sorbet.
kafka-integration-testing
dawiddutoit/custom-claude
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create-health-check
dykyi-roman/awesome-claude-code
Generates Health Check pattern for PHP 8.4. Creates application-level health endpoints with component checkers (Database, Redis, RabbitMQ), status aggregation, and RFC-compliant JSON response. Includes unit tests.
kotlin-tdd
anderssv/ai
Kotlin Test-Driven Development with fakes, object mothers, and Testing Through The Domain. Uses TestContext for dependency injection, extension functions for test data, and fakes instead of mocks. Use when writing Kotlin tests or setting up test infrastructure.
blender-agent-benchmark
ifbars/blender-agent-studio
Benchmark Blender modeling agents, skills, prompts, scripts, or MCP tools with paired isolated runs. Use for baseline-versus-plugin comparisons, regression suites, skill forward-testing, MCP usefulness evaluation, score calibration, or claims that a Blender workflow improves mesh, visual, structural, animation, cost, or completion quality.
miyazaki-perspective
khanhhuyenngo985-sys/character-scene-design-skills
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rust-testing
tusharkrbarman/skills-for-open-code
Rust testing patterns including unit tests, integration tests, async testing, property-based testing, mocking, and coverage. Follows TDD methodology.
appwrite-testing
appwrite/appwrite
Choose, write, and review tests in the Appwrite server repository using a pragmatic test pyramid. Use when adding or changing PHPUnit tests, deciding between unit and e2e coverage, moving duplicated high-level coverage lower, testing API endpoints, workers, queues, permissions, auth/scopes, persistence, serialization, retry logic, validators, security regressions, or Swoole-sensitive behavior.
