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. 79 437 files from 1 744 authors, of which 61 785 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.
Handling concurrency and non-blocking I/O in modern PHP. Use when implementing concurrent requests, async processing, or non-blocking I/O in PHP. (triggers: **/*.php, Fiber, suspend, resume, non-blocking, async)
Modern PHP error and exception handling standards. Use when implementing exception hierarchies, error handlers, or custom exceptions in PHP. (triggers: **/*.php, try, catch, finally, Throwable, set_exception_handler)
Core PHP language standards and modern 8.x features. Use when working with PHP 8.x features like enums, fibers, readonly properties, or named arguments. (triggers: **/*.php, declare, readonly, match, constructor, promotion, types)
PHP security standards for database access, password handling, and input validation. Use when securing PHP apps against SQL injection, XSS, or weak password storage. (triggers: **/*.php, pdo, password_hash, htmlentities, filter_var)
Unit and integration testing standards for PHP applications. Use when writing PHPUnit unit tests or integration tests for PHP applications. (triggers: tests/**/*.php, phpunit.xml, phpunit, pest, mock, assert, tdd)
PHP ecosystem tooling, dependency management, and static analysis. Use when managing Composer dependencies, running PHPStan, or configuring PHP build tools. (triggers: composer.json, composer, lock, phpstan, xdebug)
Expert process for gathering requirements and drafting PRDs (Iterative Discovery). Use when creating a PRD, speccing a new feature, or clarifying requirements.
Standards for maintaining code hygiene, automated checks, and testing integrity.
Requirement investigation protocol: atomic AC decomposition, actor/permission matrix, platform parity audit, truth table verification, and edge case discovery. ALWAYS consult before writing test cases or impact analysis — especially for stories with multi-condition AC, feature toggles, market variants (VN/MY/SG), or undefined platform behavior. (triggers: **/user_story.md, acceptance criteria, AC, business rules, jira story, toggle, market)
Jira ↔ Zephyr traceability: fetch story AC and components, detect existing TC links, link new Zephyr TCs back to Jira, and apply has-zephyr-tests labels. Use after creating Zephyr test cases that need linking, when fetching a Jira story's details for test generation, or when auditing and cleaning up stale TC links. (triggers: jira issue, zephyr link, has-zephyr-tests, traceability, link test case, EZRX-)
Manual test case standards: enforce 1-condition-per-TC granularity, Module_Action on Screen when Condition naming, platform prefix rules, and High/Normal/Low priority classification. Use when writing or reviewing manual test cases for Zephyr — to split compound TCs, fix naming violations, assign correct platform tags, or determine bug priority. (triggers: test case, manual test, zephyr, test scenario, naming convention, acceptance criteria)
End-to-end Jira → Zephyr workflow: parse AC, identify platform and market, impact-analyze existing TCs (update vs create new), draft test cases with correct naming/metadata/preconditions, and link back via create_test_case_issue_link. Use when converting a Jira story into Zephyr TCs, or when requirement changes require updating existing TCs rather than creating duplicates. (triggers: **/user_story.md, generate test cases, zephyr, impact analysis, create test case)
Modern React component architecture and composition patterns. Use when designing reusable React components, applying composition patterns, or structuring component hierarchies. (triggers: **/*.jsx, **/*.tsx, component, props, children, composition, hoc, render-props)
Standards for efficient React functional components and hooks usage. Use when writing custom hooks, optimizing useEffect, or working with useMemo/useCallback in React. (triggers: **/*.tsx, **/*.jsx, useEffect, useCallback, useMemo, useState, useRef, useContext, useReducer, useLayoutEffect, custom hook)
Feature-first project structure and separation of concerns for React Native. Use when structuring a React Native project or applying clean architecture patterns. (triggers: src/**/*.tsx, src/**/*.ts, app.json, feature, module, directory structure, separation of concerns, Expo, React Navigation, StyleSheet.create, react-native, mobile architecture)
Modern component patterns using function components and composition. Use when building or refactoring React Native function components and composable UI. (triggers: **/*.tsx, **/*.jsx, component, props, children, composition, presentational, container)
OTA updates with CodePush, EAS Build, and release configurations. Use when configuring OTA updates, EAS Build, or managing release configs for React Native. (triggers: app.json, eas.json, android/app/build.gradle, ios/**, deployment, codepush, eas, release, build, fastlane)
Enforce design token usage in React Native. Use when enforcing a design system, preventing hardcoded styles, or implementing theme tokens in React Native. (triggers: **/*Screen.tsx, **/*Component.tsx, **/theme/**, **/styles/**, StyleSheet, styled-components, theme, colors, spacing)
React Navigation 6+ standards for stack, tab, and deep linking. Use when implementing React Navigation stacks, tabs, or deep linking in React Native. (triggers: **/*Navigation*.tsx, src/navigation/**, navigation, react-navigation, stack, tab, drawer, deep link)
Navigation and deep linking for React Native using React Navigation. Use when setting up navigation stacks or deep linking in React Native with React Navigation. (triggers: **/App.tsx, **/*Navigator.tsx, **/*Screen.tsx, NavigationContainer, createStackNavigator, createBottomTabNavigator, linking, deep link)
Push notifications for React Native using Firebase or Expo Notifications. Use when integrating push notifications with Firebase or Expo in React Native. (triggers: **/*notification*.ts, **/*notification*.tsx, **/App.tsx, Notifications, messaging, FCM, expo-notifications, react-native-firebase)
Optimization strategies for smooth 60fps mobile apps. Use when optimizing React Native app performance, reducing re-renders, or fixing frame drops. (triggers: **/*.tsx, **/*.ts, FlatList, memo, useMemo, useCallback, performance, optimization)
Handling iOS and Android differences with Platform API and native modules. Use when handling platform-specific behavior or integrating native modules in React Native. (triggers: **/*.tsx, **/*.ts, **/*.ios.*, **/*.android.*, Platform, Platform.select, native-module, ios, android)
Secure storage, deep linking security, and certificate pinning for mobile. Use when implementing secure storage, certificate pinning, or deep link validation in React Native. (triggers: **/*.tsx, **/*.ts, security, keychain, secure-storage, deep-link, certificate-pinning)
Local and global state patterns with Context, Zustand, and Redux Toolkit. Use when choosing or implementing state management in React Native with Context, Zustand, or Redux. (triggers: **/*.tsx, **/*.ts, useState, useContext, zustand, redux, state-management)
StyleSheet API, Flexbox, theming, and responsive design. Use when implementing React Native styles, theming, Flexbox layouts, or responsive design. (triggers: **/*.tsx, **/*.ts, StyleSheet, style, theme, responsive, flexbox)
Jest and React Native Testing Library for component and integration tests. Use when writing Jest or React Native Testing Library tests for React Native components. (triggers: **/*.test.tsx, **/*.spec.tsx, __tests__/**, test, testing, jest, render, fireEvent, waitFor)
Optimization strategies for React applications (Client & Server). Use when optimizing React rendering performance, reducing re-renders, or improving bundle size. (triggers: **/*.tsx, **/*.jsx, waterfall, bundle, lazy, suspense, dynamic)
Security practices for React (XSS, Auth, Dependencies). Use when preventing XSS, securing auth flows, or auditing third-party dependencies in React. (triggers: **/*.tsx, **/*.jsx, dangerouslySetInnerHTML, token, auth, xss)
Standards for managing local, global, and server state. Use when choosing or implementing state management (Context, Zustand, Redux, React Query) in React. (triggers: **/*.tsx, **/*.jsx, state, useReducer, context, store, props)
Testing strategies with RTL and Jest/Vitest. Use when writing React component tests with React Testing Library, Jest, or Vitest. (triggers: **/*.test.tsx, **/*.spec.tsx, render, screen, userEvent, expect)
Debugging, build analysis, and ecosystem tools. Use when debugging React apps, analyzing bundles, or configuring Vite/webpack for React. (triggers: package.json, devtool, bundle, strict mode, profile)
TypeScript patterns specific to React components and hooks. Use when typing React props, hooks, event handlers, or component generics in TypeScript. (triggers: **/*.tsx, ReactNode, FC, PropsWithChildren, ComponentProps)
Adversarial security probing and vulnerability assessments across Node, Go, Dart, Java, Python, and Rust.
Universal security protocols for safe, resilient software. Use when implementing authentication, encryption, authorization, or any security-sensitive feature.
Secure coding practices for TypeScript. Use when validating input, handling auth tokens, sanitizing data, or managing secrets and sensitive configuration.
Analyze conversation corrections to detect skill gaps and auto-improve the skills library. Use after any session with user corrections, rework, or retrospective requests.
Standards for creating, testing, and optimizing Agent Skills. Use when creating, improving, catching regressions, measuring trigger rates, or writing eval cases for any skill.
Standards for OpenAPI, Versioning, and Global Error Handling. Use when designing Spring Boot APIs with OpenAPI specs, versioning, or global error handling. (triggers: **/*Controller.java, openapi, swagger, versioning, problemdetails)
Standards for project structure and layering in Spring Boot 3+ applications. Use when structuring Spring Boot 3 projects, defining layers, or applying architecture patterns. (triggers: pom.xml, build.gradle, structure, layering, dto, controller, @RestController, @Service, @Repository, @Entity, @Bean, @Configuration)
Core coding standards, dependency injection, and configuration for Spring Boot 3. Use when applying Spring Boot 3 coding standards or configuring dependency injection. (triggers: application.properties, **/*Service.java, autowired, requiredargsconstructor, configuration-properties, slf4j)
Best practices for JPA, Hibernate, and Database interactions in Spring Boot. Use when implementing JPA entities, repositories, or database access in Spring Boot. (triggers: **/*Repository.java, **/*Entity.java, jpa-repository, entity-graph, transactional, n-plus-1)
Standards for GraalVM Native Images, Docker, and Graceful Shutdown. Use when deploying Spring Boot apps as GraalVM native images, containers, or configuring shutdown. (triggers: Dockerfile, compose.yml, docker-layer, native-image, graceful-shutdown)
Standards for Feign clients and asynchronous messaging with Spring Cloud Stream. Use when implementing Feign HTTP clients or async event messaging in Spring Boot microservices. (triggers: **/*Client.java, **/*Consumer.java, feign-client, spring-cloud-stream, rabbitmq, resilience4j)
Standards for Micrometer, Distributed Tracing, and Structured Logging. Use when adding Micrometer metrics, distributed tracing, or structured logging to Spring Boot. (triggers: logback-spring.xml, application.properties, micrometer, tracing, correlation-id, mdc)
Standards for scheduled tasks and distributed locking with ShedLock. Use when implementing @Scheduled tasks or distributed locking with ShedLock in Spring Boot. (triggers: **/*Scheduler.java, **/*Job.java, scheduled, shedlock, cron)
Spring Security 6+ standards, Lambda DSL, and Hardening. Use when configuring Spring Security 6+, OAuth2, JWT, or security hardening in Spring Boot. (triggers: **/*SecurityConfig.java, **/*Filter.java, security-filter-chain, lambda-dsl, csrf, cors)
Standards for unit, integration, and slice testing in Spring Boot 3. Use when writing unit tests, integration tests, or slice tests for Spring Boot 3 applications. (triggers: **/*Test.java, webmvctest, datajpatest, testcontainers, assertj)
Standards for Guard, Value Types, Immutability, and Naming. Use when writing idiomatic Swift using guard, value types, immutability, or naming conventions. (triggers: **/*.swift, guard, let, struct, final)
Standards for async/await, Actors, Task Groups, and MainActor. Use when implementing Swift async/await, Actors, or structured concurrency in iOS/macOS. (triggers: **/*.swift, async, await, actor, Task, MainActor)
Standards for Throwing Functions, Result Type, and Never. Use when implementing Swift error throwing, Result<T,E>, or designing error hierarchies. (triggers: **/*.swift, throws, try, catch, Result, Error)
Standards for Optionals, Protocols, Extensions, and Type Safety. Use when working with Swift Optionals, Protocols, Extensions, or type-safe APIs. (triggers: **/*.swift, protocol, extension, optional, guard, enum)
Standards for ARC, Weak/Unowned References, and Capture Lists. Use when managing Swift ARC, avoiding retain cycles, or configuring capture lists in closures. (triggers: **/*.swift, weak, unowned, capture, deinit, retain)
Standards for State Management, View Lifecycle, and Property Wrappers. Use when managing SwiftUI state, view lifecycle, or property wrappers like @State and @Binding. (triggers: **/*.swift, @State, @Binding, @ObservedObject, View, body)
Standards for XCTest, Async Tests, and Test Organization. Use when writing XCTest cases, async tests, or organizing test suites in Swift. (triggers: **/*Tests.swift, XCTestCase, XCTestExpectation, XCTAssert)
Standards for SPM, Build Configs, and Code Quality. Use when managing Swift packages with SPM, configuring build settings, or enforcing Swift code quality. (triggers: Package.swift, .swiftlint.yml, package, target, dependency)
Universal architectural standards for robust, scalable systems. Use when designing new features, evaluating architecture, or resolving scalability concerns.
Enforces Test-Driven Development (Red-Green-Refactor). Use when writing unit tests, implementing TDD, or improving test coverage for any feature.
Development tools, linting, and build config for TypeScript. Use when configuring ESLint, Prettier, Jest, Vitest, tsconfig, or any TS build tooling.
Idiomatic TypeScript patterns for clean, maintainable code. Use when writing or refactoring TypeScript classes, functions, modules, or async logic. (triggers: **/*.ts, **/*.tsx, class, function, module, import, export, async, promise)
Claude Skills — questions
Answers built from the skills we actually parsed.