Skills
97,222 packaged capabilities and playbooks for agents. Install any of them with one command.
Testing & quality
Use this skill when auditing a codebase for AI agent readiness, or when guiding improvements to make a codebase work well with agentic coding tools. It applies when users ask to evaluate test coverage, file structure, type system usage, dev environment speed, or automated enforcement—the five pillars that determine how effectively coding agents can operate in a project. Triggers on “audit my codebase,” “make this agent-ready,” “improve for AI agents,” “agent-friendly,” or questions about why agents struggle with a codebase.
Systematic hardware debugging guide for Arduino/ESP32/RP2040 circuits. Use when user reports: circuit not working, components getting hot, no power, intermittent failures, unexpected behavior, sensor not responding, LED not lighting, motor not spinning. Guides through power checks, continuity testing, signal tracing, and component isolation using multimeter techniques.
Generates production-grade JUnit 5 unit and integration tests in Java. Covers assertions, parameterized tests, lifecycle hooks, mocking with Mockito, and nested tests. Use when the user mentions “JUnit,” “JUnit 5,” “@Test,” “assertEquals,” “Assertions,” or “Java unit test.” Triggers on: “JUnit,” “@Test,” “assertEquals,” “Java test,” “unit test Java.”
Install, instrument and verify this running web app from the inside (DOM, network, routing, console and framework state) instead of screenshots or guessing. Drives one real flow end to end and returns a verdict with the file:line to fix. Use when the user asks to set up or install Reticle, when a user-facing change needs proving before you call it done, when a test passes but the UI is broken, or when the user types /reticle.
Benchmark similar product documentation and API documentation across Alibaba Cloud, AWS, Azure, GCP, Tencent Cloud, Volcano Engine, and Huawei Cloud. Given one product keyword, auto-discover latest official docs/API links, score quality consistently, and output detailed prioritized improvement recommendations.
Builds end-to-end browser tests for critical user flows using Playwright or Cypress. Includes selector strategies, test data management, page objects, and visual regression testing. Use for "E2E testing", "browser tests", "Playwright", or "Cypress tests".
Expert WCAG (Web Content Accessibility Guidelines) advisor covering WCAG 2.0, 2.1, and 2.2 — the W3C international accessibility standards. Use this skill whenever a user asks about WCAG success criteria, conformance levels (A/AA/AAA), accessibility audits, POUR principles, accessibility statements, ARIA patterns, colour contrast, keyboard accessibility, screen reader compatibility, mobile accessibility, cognitive accessibility, WCAG 2.2 new criteria, WCAG 3.0 preview, legal requirements referencing WCAG (EN 301 549, EAA, ADA, Section 508), or mapping WCAG to accessibility laws. Trigger for any web or digital content accessibility question — even if the user doesn't say "skill" or "WCAG".
Test quality review drawing on twelve classic engineering books — with primary focus on xUnit Test Patterns, The Art of Unit Testing, How Google Tests Software, and Working Effectively with Legacy Code — that diagnoses structural problems in an existing test suite: brittleness, mock abuse, coverage illusions, slow execution, poor readability. Triggers when: user asks about test quality, shares test files for review, or expresses frustration: "tests keep breaking whenever I change anything", "our tests take forever", "tests pass but bugs still reach production", or "we have too many mocks". Do NOT trigger for: writing new tests from scratch (use the regular test-writing workflow) or testing framework/syntax questions — this skill reviews an existing suite for structural quality problems, not individual test authoring.
Review web application code for bugs, security issues, performance problems, and stack-specific anti-patterns. Use this skill whenever the user wants to review code, debug a production issue, investigate a build failure, audit security, or check a PR before merging. Triggers on code review, review my code, debug, build error, broken, not working, why is X failing, check this code, security check, PR review, audit code, refactor. Also triggers when investigating 4xx or 5xx errors, deploy failures, environment variable issues, and CMS integration problems.
Expert-level JavaScript testing skill focused on writing high-quality tests that find bugs, serve as documentation, and prevent regressions. Advocates property-based testing with fast-check and protects against indeterministic code in tests. Does not cover black-box e2e testing.
Diagnose and fix Core Web Vitals issues on AEM Edge Delivery Services pages. Goes deeper than generic CWV advice by understanding EDS-specific performance patterns including the 100KB LCP budget, E-L-D loading phases, block rendering behavior, and third-party script impact. Produces specific fixes for LCP, CLS, and INP issues with before/after projections. Use when the user asks about Core Web Vitals, page speed, or performance issues on AEM Edge Delivery Services (EDS/Franklin) sites.
AI-powered E2E testing for any app — Flutter, React Native, iOS, Android, Electron, Tauri, KMP, .NET MAUI. Connects via MCP to running apps so the agent can take screenshots, tap elements, enter text, scroll, inspect UI trees, and verify state with natural language. Use when the user wants to test an app's UI end-to-end, automate cross-platform testing, run smoke tests, validate form flows, or verify navigation without writing test code.
Establishes git workflow guardrails including conventional commits, commit message hooks, branch naming conventions, PR templates, and code review processes. Provides hook configurations, workflow templates, and emergency bypass instructions. Use when users request "setup git hooks", "enforce commit conventions", "add PR templates", or "standardize git workflow".
Systematically investigates, diagnoses, and resolves complex Magento 2 technical problems. Use when debugging issues, investigating bugs, analyzing performance problems, resolving errors, or troubleshooting system failures. Masters log analysis, performance profiling, and root cause analysis.
Extract formal spec and comprehensive test suites from existing MoonBit implementations. Use when asked to "extract spec from implementation", "generate tests from code", or "create spec-driven tests for existing package". Analyzes existing code to produce spec.mbt with `declare` keyword stubs and organized test files (valid/invalid).
Develop or review put.io end-user apps and shared frontend packages: UI, state, tests, docs, test harnesses, delivery, and frontend machine setup. Use in a put.io frontend repository or for put.io frontend conventions. Not for unrelated frontend work, browser-only put.io inspection, SDK or API client work, or putio CLI consumer operations; frontend test-harness auth setup stays in scope.
Write, run, and analyze structured test suites for Agentforce agents. TRIGGER when the user writes or modifies test spec YAML (AiEvaluationDefinition); runs sf agent test create, run, run-eval, or results commands; asks about test coverage strategy, metric selection, or custom evaluations; interprets test results or diagnoses test failures; or asks about batch testing, regression suites, or CI/CD test integration. DO NOT TRIGGER when the user creates, modifies, previews, or debugs .agent files (use developing-agentforce); deploys or publishes agents; writes Agent Script code; uses sf agent preview for development iteration; analyzes production session traces (use observing-agentforce); or requests OWASP, security, or red-team testing (use securing-agentforce).
Full three-perspective audit of an existing website from one URL — design (tensions + concrete improvement opportunities), SEO/technical, and LLM/AI-search visibility — plus Core Web Vitals, synthesized into a scored, evidence-bound report. Use when the user asks to “audit this site”, “site audit”, “design audit”, “SEO audit”, “why is my site underperforming”, “LLM visibility”, “how does my site look to AI”, or invokes `$stardust audit` (`/stardust:audit` in Claude Code) <url>
Creates a DevOps Center WorkItem to track a fix for a test failure or Code Analyzer violation. Before creating anything, it shows a subject/assignee/project preview and requires explicit confirmation. Use this skill when you want to create a fix work item, track a remediation task, or assign a test or analysis failure to a developer. TRIGGER when: the user wants to create a fix work item, log a remediation, or assign a failure to a developer for resolution. DO NOT TRIGGER when: writing the fix code itself (use generating-apex).
Generates production-grade Cypress E2E and component tests in JavaScript or TypeScript. Supports local execution and TestMu AI cloud. Use when the user asks to write Cypress tests, set up Cypress, test with cy commands, or mentions “Cypress”, “cy.visit”, “cy.get”, or “cy.intercept”. Triggers on: “Cypress”, “cy.”, “component test”, “E2E test”, “TestMu”, “LambdaTest”.
Complete guide to React and Next.js best practices covering performance optimization, component architecture, shadcn/ui patterns, Motion animations, and modern React 19+ patterns. Use when writing, reviewing, or refactoring React/Next.js code. Triggers on tasks involving React components, Next.js pages, data fetching, UI components, animations, or code quality improvements. Scope is client-side React/Next — for Node/Express/API backend, use backend-patterns; for cross-cutting TS/JS standards, coding-standards.
Re-syncs a configured DevOps Center test provider on a pipeline to pick up new test suites, via the Connect API sync endpoint, after explicit user confirmation. Takes a pipelineId and one or more testProviderIds and triggers an asynchronous re-sync so newly added suites become available for assignment. Use this skill when a test provider (e.g. Apex Unit Tests, Code Analyzer, Flow Tests, Provar) has had suites added since it was last configured and the user wants those suites to show up in DevOps Center. TRIGGER when: the user wants to re-sync a test provider, pull in new suites from a provider, refresh a provider's suite list, or says assigned suites are missing/out of date for a configured provider. DO NOT TRIGGER when: configuring a provider for the first time (that creates a new DevopsPipelineTestProvider configuration), or assigning/mapping existing suites to a stage (use managing-suite-assignments).
Generates WebdriverIO (WDIO) automation tests in JavaScript or TypeScript. Supports local and TestMu AI cloud. Use when the user mentions "WebdriverIO", "WDIO", "wdio.conf", "browser.url", "$", "$$". Triggers on: "WebdriverIO", "WDIO", "wdio", "browser.$"
Write tests that pin real behavior instead of implementation details, config values, or lucky samples. Use when adding tests for new behavior, writing a regression test, fixing a brittle or flaky test, reviewing a test diff, or when a test breaks after a refactor or config change that didn't change behavior.
Sweep a whole running web app for what is broken, without writing a script or knowing the codebase. Clicks every reachable control and reports dead buttons, console errors, failed requests, and places where the API and the screen disagree. Use on an unfamiliar codebase, before a release, after a big merge or dependency bump, when the user asks for a smoke test or a health check, or when someone says "just check everything still works".
QA an analysis before sharing with stakeholders — methodology checks, accuracy verification, and bias detection. Use when reviewing an analysis for errors, checking for survivorship bias, validating aggregation logic, or preparing documentation for reproducibility
Rust best practices and code quality guidelines for writing idiomatic, safe, and performant Rust code. Use when writing, reviewing, or refactoring Rust code. Triggers on tasks involving Rust programming, code review, error handling, type safety, or performance optimization.
This skill should be used when the user wants to implement features or fix bugs using test-driven development. Enforces the RED-GREEN-REFACTOR cycle with vertical slicing, context isolation between test writing and implementation, human checkpoints, and auto-test feedback loops. Uses multi-agent orchestration with the Task tool for architecturally enforced context isolation. Supports Jest, Vitest, pytest, Go test, cargo test, PHPUnit, and RSpec.
Combined codebase health dashboard that scores a project across all four quality dimensions — PR quality, architecture, tech debt, and test quality — in a single pass, drawing on twelve classic engineering books. Triggers when: user wants an overall quality assessment, asks "how healthy is this codebase?", "run all the checks", "I need a health score before the release", or wants to onboard a new team with a quality overview. Do NOT trigger for: server health checks, HTTP health endpoints, Kubernetes liveness/readiness probes, database health, or application uptime. Also do not trigger when the user specifically requests only one dimension — use the corresponding focused skill instead (brooks-review / brooks-audit / brooks-debt / brooks-test).
Full-sweep mode: runs a unified analysis across all quality dimensions — code decay, architecture, tech debt, and test quality — then applies fixes directly to the codebase. Safe changes are auto-applied; risky changes are confirmed before execution. Drawing on twelve classic engineering books. Triggers when: user wants to "fix everything", "sweep the codebase", "auto-fix all issues", "clean up the whole project", or asks for a single command that both diagnoses and remediates quality problems. Do NOT trigger for: read-only audits or health reports where the user only wants findings without code changes; single-dimension reviews (use the focused skill instead: brooks-review / brooks-audit / brooks-debt / brooks-test); server health checks, HTTP /health endpoints, Kubernetes probes, database health, or application uptime.
Not an accessibility surveyor's opinion and not legal advice. Implement Israeli web accessibility compliance per IS 5568 standard, which is WCAG 2.0 AA plus Israeli national changes, for Hebrew RTL applications. Use when the user asks about Israeli accessibility law, "negishot" (accessibility), IS 5568, "teken negishot" (accessibility standard), "nachim" (disabilities), Hebrew screen reader support, RTL ARIA patterns, or accessibility audits for Israeli websites. Covers mandatory legal requirements under the Equal Rights for Persons with Disabilities Act, who is exempt, enforcement and penalties, the accessibility coordinator role, Hebrew screen reader compatibility (NVDA, JAWS, VoiceOver), native mobile apps, and RTL-specific ARIA patterns. Do NOT use for general WCAG guidance without Israeli context (use standard a11y resources instead), or for building a self-hosted accessibility preferences widget (use wcag-accessibility-widget).
Design and implement automated tests for current Minecraft 26.x or legacy 1.21.x mods and plugins using JUnit, MockBukkit, NeoForge Game Tests, or Fabric Game Tests. Use for test code and test execution, not release publishing or gameplay implementation.
Analyze production Agentforce agent behavior using session traces and Data Cloud. TRIGGER when: user queries STDM session data or Data Cloud trace records; investigates production agent failures, regressions, or performance issues; asks about session traces, conversation logs, or agent metrics; wants to reproduce a reported production issue in preview; runs findSessions or trace analysis queries. DO NOT TRIGGER when: user creates, modifies, or debugs .agent files during development (use developing-agentforce); writes or runs test specs (use testing-agentforce); uses sf agent preview for local development iteration; deploys or publishes agents.
Analyzes a commit diff and available DevOps Center test suite metadata to recommend the most relevant existing test suites, then flags coverage gaps where no suite covers a new method—all through reasoning, with no system calls beyond prerequisite queries. Use when a developer wants to know which test suites to run for a specific commit or diff, what tests cover their changes, or wants suite recommendations at commit time. Trigger when the user asks which test suites to run for a commit/diff, what tests cover their changes, or requests suite recommendations before promoting. Do not trigger when authoring new tests (use generating-apex-test) or running sf apex run test directly (use running-apex-tests).
Creates integration tests for API endpoints with database flows, including test harness setup, fixtures, setup/teardown, database seeding, and CI-friendly strategies. Use for “integration testing,” “API tests,” “database tests,” or “test harness”
Same-design migration—re-platform a site to AEM Edge Delivery (or any clean front end) keeping its current design near pixel-perfect. Recreates key pages (one archetype per page type) as clean re-authored HTML/CSS (never DOM copies), verifies each against the live site with a measured source-fidelity gate (structural + visual + stitched pixel diff per breakpoint), then hands off to migrate/deploy/rollout for site-wide delivery (subsumes prepare-migration's prep cascade—never chain the two). The only permitted design changes are entries in an explicit inconsistency register. Use when the user says “migrate this site keeping its current design”, “same-design migration”, “pixel-perfect replatform to AEM”, or “keep the design, change the platform”. NOT for redesigns—those are the stardust core pipeline (direct/prototype) or uplift.
New to MCP?
From what the protocol is to installing your first server, these answers cover most first questions.
An open protocol that defines how AI applications connect to external tools and data in a uniform way. Clients talk to the model; MCP servers provide tools, resources and prompt templates. They exchange standard messages, so one server can be reused by many clients.