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.
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15 tools across six categories
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agent-integration-testing
av/facts
Use when the user requests integration testing, feature validation, or test plan execution
nuke-test
b4r7x/nuke-skills
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playwright
moizibnyousaf/ai-agent-skills
Use when the task requires automating a real browser from the terminal (navigation, form filling, snapshots, screenshots, data extraction, UI-flow debugging) via `playwright-cli` or the bundled wrapper script.
swarm-review
dralgorhythm/claude-agentic-framework
Run an adversarial, multi-perspective code review with root-cause analysis and security focus — a user-invoked Adversarial Reviewer workflow.
typescript-testing
shinpr/claude-code-workflows
Frontend testing rules with Vitest, React Testing Library, and MSW. Includes coverage requirements, test design principles, and quality criteria. Use when writing frontend tests or reviewing test quality.
bun-development
involvex/skills
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, o...
redis-pentesting
wgpsec/aboutsecurity
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backend-go-grpc
jimnguyendev/jimmy-skills
Provides gRPC usage guidelines, protobuf organization, and production-ready patterns for Golang microservices. Use when implementing, reviewing, or debugging gRPC servers/clients, writing proto files, setting up interceptors, handling gRPC errors with status codes, configuring TLS/mTLS, testing with bufconn, or working with streaming RPCs.
vitest
workleap/wl-squide
Vitest fast unit testing framework powered by Vite with Jest-compatible API. Use when writing tests, mocking, configuring coverage, or working with test filtering and fixtures.
jest-react-testing
manutej/crush-mcp-server
Comprehensive React component testing with Jest and React Testing Library covering configuration, mocking strategies, async testing patterns, hooks testing, and integration testing best practices
vitest
full-statck-skills/testing-skills
Provides comprehensive guidance for Vitest testing framework including fast test execution, Vite integration, component testing, mocking, and configuration. Use when the user asks about Vitest, needs to write fast unit tests, test Vue/React components, or configure Vitest with Vite projects.
vitest
ehyland/skills
Vitest fast unit testing framework powered by Vite with Jest-compatible API. Use when writing tests, mocking, configuring coverage, or working with test filtering and fixtures.
vitest-dev
bjornmelin/dev-skills
Generic Vitest/TypeScript testing: write or repair tests, triage flakes, tune monorepo config, and reduce local/CI test time.
creating-financial-models
anthropics/claude-cookbooks
This skill provides an advanced financial modeling suite with DCF analysis, sensitivity testing, Monte Carlo simulations, and scenario planning for investment decisions
moai-ref-testing-pyramid
modu-ai/moai-adk
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playwright
firecrawl/skills
Use when the task requires automating a real browser from the terminal (navigation, form filling, snapshots, screenshots, data extraction, UI-flow debugging) via `playwright-cli` or the bundled wrapper script.
react-testing
citypaul/dotfiles
React component testing patterns including components, hooks, context, and forms. Covers Vitest Browser Mode with vitest-browser-react (preferred) and @testing-library/react. Use when testing React applications. For general UI testing patterns, see the front-end-testing skill.
qa-automation
dedalus-erp-pas/foundation-skills
Expert Playwright/TypeScript test automation using a 3-layer architecture (spec → steps → POM), fixture dependency injection, and JDD test data (entrants/sortants). Use when creating, modifying, or debugging Playwright tests, page objects, step files, fixtures, or test data in projects following this architecture.
bun-usage
menoncello/skillsmp-research-plugin
This skill should be used when working with Bun, a fast JavaScript runtime and toolkit. Use this skill for tasks involving Bun runtime execution, package management, bundling, testing, or when users ask about Bun-specific features, APIs, or best practices. Trigger when users mention "bun" commands, Bun's APIs, or request help with Bun installation, configuration, or usage.
blog-writer
sundial-org/awesome-openclaw-skills
This skill should be used when writing blog posts, articles, or long-form content in the writer's distinctive writing style. It produces authentic, opinionated content that matches the writer's voice—direct, conversational, and grounded in personal experience. The skill handles the complete workflow from research review through Notion publication. Use this skill for drafting blog posts, thought leadership pieces, or any writing meant to reflect the writer's perspective on AI, productivity, sales, marketing, or technology topics.
custom-canvas-and-gestures
zakariaf/flutter-skills
Enforces CustomPainter/Canvas discipline — the View/Painter/Scene split with a dumb painter fed one immutable Scene value type, shouldRepaint as a single value compare kept strictly separate from the AnimationController-as-repaint animation path, one shared affine transform read by BOTH painter and hit-tester (toCanvas/toLogical exact inverses, never re-derive scale), geometry hit-testing (integer lattice or rasterized region-ID buffer, never Path.contains), zero-allocation paint(), gesture-as-pure-translator emitting a typed command to a Notifier (never mutating in the handler), ExcludeSemantics + sibling Semantics speaking display values with redundant non-colour encoding, measured TextPainter fitting, first-party RoundedSuperellipseBorder, physical-pixel hairlines, and Directional-only geometry. Use when writing or reviewing a CustomPainter/CustomPaint, gestures on a canvas, tap/drag hit-testing, canvas animation, measured text fitting, or Semantics over custom-drawn pixels.
load-testing-patterns
vibeeval/vibecosystem
k6 script templates, load profiles, response time thresholds, SLO validation, and performance testing strategies.
swift-testing
fiveonecode/agent-skills
Writes, reviews, and improves Swift Testing code using modern APIs and best practices. Use when reading, writing, or reviewing projects that use Swift Testing, including @Test, #expect, #require, async tests, XCTest migration, traits, confirmations, exit tests, and Swift 6.2+ testing features.
vitest-testing
gilvam/skills
Guides Vitest-based unit and integration tests with vi mocks, Arrange-Act-Assert, fake timers for Date, HTTP endpoint integration tests without supertest, use-case and domain coverage. Use when writing or reviewing a Vitest unit or integration test, creating or editing a .spec.ts/.test.ts file, mocking with vi, faking timers for Date, testing an HTTP endpoint, or asked to add test coverage for a use case. Do not use for Jest-centric projects or Sinon as primary mocking.
pytest
full-statck-skills/testing-skills
Provides comprehensive guidance for pytest testing framework including test writing, fixtures, parametrization, mocking, and plugins. Use when the user asks about pytest, needs to write Python tests, use pytest fixtures, or configure pytest for Python projects.
cypress-ops
0xdarkmatter/claude-mods
Cypress end-to-end and component testing operations - selector/retry-ability strategy, cy.intercept network stubbing, cy.session auth, component vs e2e, flake diagnosis, CI, Test Replay. Use for: cypress, e2e test, component test, cy.get, cy.intercept, cy.session, data-cy, data-test, retry-ability, flake, flaky test, cypress.config, cy.mount, Test Replay, custom commands, fixtures.
property-based-testing
igmarin/elixir-phoenix-skills
>
pkl
mikkelkrogsholm/dev-skills
PKL (Pickle) is Apple's open-source, programmable configuration language — a type-safe alternative to YAML/JSON/TOML. Use this skill when writing PKL configuration files, amending PKL modules, defining PKL schemas or classes, generating config output in JSON/YAML/TOML/plist, or integrating PKL into a build pipeline. Triggers on .pkl files, PKL module authoring, amend expressions, typed property definitions, Listing/Mapping usage, or pkl eval/test/project CLI commands.
agent-browser
inference-sh/skills
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
python-executor
inference-sh/skills
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
develop-web-game
firecrawl/skills
Use when Codex is building or iterating on a web game (HTML/JS) and needs a reliable development + testing loop: implement small changes, run a Playwright-based test script with short input bursts and intentional pauses, inspect screenshots/text, and review console errors with render_game_to_text.
verifying-external-behavior
wdm0006/python-skills
Confirms what a third-party library, remote API, build backend, or scraped document actually does before writing code that depends on it — throwaway probes that run in seconds, permissive clients that forward wrong arguments instead of rejecting them, per-endpoint docs that don't generalize, response shapes that make a "fast path" always-false, fakes that encode your assumption rather than the service's behavior, and dry-runs that skip the step that fails. Use when integrating a new dependency or endpoint, writing a tolerated-status or error branch, choosing a client argument name, testing against a fake, or reviewing code that asserts an upstream contract.
mutation-testing
citypaul/dotfiles
Set up and run mutation testing with Stryker, including full-project and diff-against-main runs, then use surviving mutants to strengthen weak or missing tests. Use during the MUTATE phase of the TDD cycle, when verifying that tests actually catch bugs (coverage alone is not enough), when the user mentions mutation testing, Stryker, mutation score, or surviving mutants, or when assessing whether a test suite would detect realistic regressions. For writing the tests themselves, see testing.
testing
citypaul/dotfiles
Testing patterns for behavior-driven tests. Use when writing tests, creating test factories, structuring test files, or deciding what to test. Do NOT use for UI-specific testing (see front-end-testing or react-testing skills).
bun-docs
theimpostor/bun-doc-skill
Consult Bun's official documentation snapshot for runtime APIs, `bun` CLI commands, `bunfig.toml`, package management, bundling, testing, deployment guides, and ecosystem integrations. Use this whenever the user asks how to do something with Bun, troubleshoot Bun-specific behavior, compare Bun to Node/npm, or wants Bun command or API guidance, even if they only mention a command like `bun install`, `bun test`, `bun build`, `bunx`, `Bun.serve`, or a Bun config option.
data_transform
vuralserhat86/antigravity-agentic-skills
Transform raw data into analytical assets using ETL/ELT patterns, SQL (dbt), Python (pandas/polars/PySpark), and orchestration (Airflow). Use when building data pipelines, implementing incremental models, migrating from pandas to polars, or orchestrating multi-step transformations with testing and quality checks.
ohos-dev-distributed-mmi-uinput-virtual-device
openharmonyinsight/openharmony-skills
Use when testing OpenHarmony input subsystem features (mouse/keyboard/touchpad event flow, device binding, display group isolation) on a real device without physical peripherals. Covers /dev/uinput device creation, event injection, InputManager device discovery, and hot-plug simulation.
building-llm-backed-features
wdm0006/python-skills
Builds application features on top of an LLM API in Python — prompt surfaces that drift apart, structured outputs, context budgeting, model/config wiring, filtered evaluator sets, keeping live-model calls out of default CI, evaluating stochastic output, and presenting model output truthfully. Use when adding an LLM call to an app, designing structured outputs or prompt templates, filtering audit rules, wiring model config, or testing/evaluating LLM-backed analysis.
pytest
1mangesh1/dev-skills-collection
Python testing mastery with pytest, fixtures, parametrize, mocking, and coverage. Use when user asks to "write tests", "add pytest fixtures", "mock a function", "parametrize tests", "run coverage", "debug failing test", "set up conftest", or any Python testing tasks.
pytest-dev
bjornmelin/dev-skills
World-class pytest engineer for Python: write/refactor tests, fix flakiness, design fixtures/markers, add coverage, speed up suites (collection/runtime), and optimize CI (GitHub Actions sharding, xdist parallelism, caching). Use when asked about pytest best practices, pytest 9.x features (subtests, strict mode, TOML config), pytest plugins (xdist/cov/asyncio/mock/httpx), or test performance/CI tuning.
jsf-unit-test-doc
zeno-common/java-service-framework-doc
Use when coding with jsf-unit-test SDK, need API reference for YAML property loading in tests, or JUnit 5 / Mockito test dependencies.
playwright-accessibility-testing
flpbalada/fb-skills
Write, review, or fix Playwright accessibility tests with @axe-core/playwright. Use for axe scans, WCAG A/AA tags, ARIA names, roles, labels, keyboard/focus checks, accessibility audit failures, exclusions, and critical page or flow a11y coverage. For general Playwright locator, assertion, fixture, or flake guidance use playwright-best-practices.
e2e-testing
avantmedialtd/skills
E2E and visual regression testing with Playwright. Use when writing tests, running E2E tests, debugging test failures, or working with visual baselines. Contains test commands, patterns, and debugging tips.
vdd
kvithayathil/agent-resources
>
e2e
getsentry/sentry-javascript
Run E2E tests for Sentry JavaScript SDK test applications
e2e-testing
redis/redisinsight
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youtube-thumbnail-design
inference-sh/skills
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
viral-instagram-reels
vyralcontent/content-skills
Plan, write, and diagnose Instagram Reels that earn cold-audience reach. Use whenever someone wants a reels script or reels hook for a specific Reel, is debugging why a Reel flopped, wants to know if a draft is worth testing with Trial Reels before going public, or needs a reels caption tuned for the post-hashtag instagram algorithm. Built around what Mosseri has publicly named as the signal hierarchy (watch time, sends per reach, likes per reach), the Trial Reels test-then-publish loop, the Original Content Guidelines and 30-day recovery window, the Edits app, and Reels Insights metrics (skip rate, share rate, followers from this post). Covers a Reels-specific reels strategy: send-driving CTAs, originality without watermarks, audio licensing by account type, captions as the primary SEO signal, and the anti-patterns that quietly cap distribution. Pattern-based guidance, not a virality promise.
headless-adapters
plaited/agent-eval-harness
Discover, create, and validate headless adapters for agent integration. Includes scaffolding tools and schema-driven compliance testing.
comprehensive-testing
majiayu000/spellbook
Complete testing strategy covering TDD workflow, test pyramid, unit/integration/E2E/property testing, framework best practices (Jest, Vitest, pytest), mock strategies, and CI integration. Use when writing tests, reviewing test quality, or establishing testing standards.
ruby-version-manager
st0012/ruby-skills
Use at session start for Ruby projects (Gemfile, .ruby-version, or .tool-versions present). Detect version manager BEFORE running ruby, bundle, gem, rake, rails, rspec, or any Ruby command.
nextjs-quality
paldom/node-skills
Tunes Next.js App Router application quality - next.config hardening, eslint-config-next flat config, strict mode and typed routes, RSC and use-client boundary hygiene, bundle analysis, image and font optimization. Use when the user asks to production-harden a Next.js app, fix hydration or use-client errors, or shrink a Next bundle. Not for generic Node linting, unit test setup, or npm packaging.
godot
saschb2b/skills
Godot game engine development skill, a dated snapshot tracking the current stable Godot (4.x, currently 4.7). Covers GDScript static typing and syntax, scene and node architecture, the resource system, signals, autoloads, the SceneTree and lifecycle, physics and movement, collision and raycasts, input, math and vectors, navigation and pathfinding, TileMapLayer, UI and Control nodes, animation and tweens, audio, shaders, particles, saving and persistence, performance, testing, multiplayer, the editor and CLI workflow, the .tscn/.tres/project.godot text formats, and version-specific pitfalls and breaking changes. Use when working on any Godot project, whether writing GDScript, creating or editing scenes and resources, configuring project.godot, building game systems, or debugging Godot-specific issues. Triggers on any Godot game development task. Check the project's Godot version first; this snapshot ages, so verify version-specific claims against the official docs when the snapshot date looks old.
go-unit-testing
sentenz/skills
Automates unit test creation for Go projects using the standard testing package with consistent software testing patterns including In-Got-Want, Table-Driven Testing, and AAA patterns. Use when creating, modifying, or reviewing unit tests, or when the user mentions unit tests, test coverage, or Go testing.
abp-integration-testing
thapaliyabikendra/ai-artifacts
Generate integration tests for ASP.NET Core ABP Framework application services and HTTP APIs. Use when the user requests integration tests, end-to-end tests, API tests, or wants to verify ABP framework integration points (repositories, authorization, validation, multi-tenancy, unit-of-work, data filters). Trigger even if the user just says "add tests" for an ApplicationService — ask if they want unit or integration tests.
n8n-development
89jobrien/steve
n8n workflow development patterns, testing, validation, and best practices for building composable webhook workflows
code-permutation-testing
89jobrien/steve
Systematic testing of code variations, edge cases, boundary conditions, and alternative implementations. This skill provides methodologies and tools for exhaustive testing including input permutation, code path analysis, mutation testing, and implementation alternatives. Use when ensuring code robustness through comprehensive test coverage or when exploring edge cases and boundary conditions.
pytest
microsoft/debugpy
Best practices for writing and organizing tests with pytest including fixtures, parametrize, and plugins.
vitest
ghosttypes/ff-5mp-api-ts
Comprehensive Vitest testing framework skill for writing, configuring, and running tests in JavaScript/TypeScript projects. Use when Claude needs to: set up Vitest in a new or existing project (Vite or non-Vite), write or modify tests using Vitest APIs, configure Vitest for specific scenarios (coverage, browser testing, mocking, etc.), migrate from Jest or older Vitest versions, debug test failures or configuration issues, implement advanced testing patterns (workspace, browser mode, snapshots, mocking).
vitest
fefogarcia/approved-skills
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