單元測試

TDD方法論に従ってテストを作成します。テストファイルの配置（コロケーション）、命名規則、テスト構造のベストプラクティスに従います。React/TypeScript、Go、Rustで適切なパターンを使い分けます。「テストを書いて」「テストを作成」「単体テストを追加」などのリクエストで起動します。

A skill to automatically download and install the latest ButterCut version from GitHub while preserving libraries. Use when user wants to check for updates or update their installation for new features.

Add integration tests for type checker inference and checking functions

CI Test Claude Skill

Step-by-step guide for adding support for a new AI editor format to PRPM - covers types, converters, schemas, CLI, webapp, and testing

CI Test Factory Droid Skill

Use when setting up npm publishing with GitHub Actions - provides trusted publishing with OIDC, provenance attestations, and monorepo configuration

Systematically review completed code implementations against original plans, requirements, and coding standards to ensure quality, plan alignment, and best practices adherence. Use this skill after completing any significant implementation work including features, refactorings, bug fixes, or architectural changes, when a numbered step or phase from a planning document has been finished, after implementing multiple related functions or components that form a logical unit, when finishing work that was specified in a technical specification or design document, after making substantial changes to existing code or architecture, before creating pull requests to validate implementation quality, when completing API endpoints, service layers, or data access implementations, after implementing test suites for new functionality, when refactoring code to ensure no behavior was inadvertently changed, after integrating with external systems or third-party services, when finishing user-facing features to verify requirements

Expert guidance for developing Claude Code hooks in TypeScript with shared utilities, esbuild compilation, and Vitest testing - distributes compiled JS while maintaining TypeScript development experience

Apply rigorous test-driven development methodology following the Red-Green-Refactor cycle (write failing test, implement minimal code to pass, refactor while staying green) that ensures tests genuinely verify behavior by requiring observed failure before implementation, preventing untested code and false-positive tests. Use this skill when implementing any new feature or functionality in any programming language, when fixing bugs or resolving defects in existing code, when refactoring code to improve design while preserving behavior, when adding new methods, functions, classes, or modules to a codebase, when modifying existing behavior or business logic, when writing code in any file that will be executed in production environments, when creating API endpoints, service methods, or controller actions, when implementing data validation, transformation, or processing logic, when building user interface components with testable behavior, when writing algorithms, calculations, or business rules, when integrating w

Build accessible user interfaces using semantic HTML, proper ARIA attributes, keyboard navigation, color contrast, and screen reader compatibility. Use this skill when creating or modifying frontend components, HTML templates, React/Vue/Svelte components, forms, interactive elements, navigation menus, modals, or any UI elements. Apply when working with HTML files, JSX/TSX components, template files, ensuring keyboard accessibility, implementing focus management, adding alt text to images, creating form labels, testing with screen readers, managing ARIA attributes, maintaining color contrast ratios, or building heading hierarchies. Use for any task involving UI accessibility compliance, WCAG standards, or inclusive design patterns.

Use when developing PRPM (Prompt Package Manager) - comprehensive knowledge base covering architecture, format conversion, package types, collections, quality standards, testing, and deployment

Use when testing PRPM CLI commands locally - provides build, environment setup, execution workflow, contract testing to verify documented behavior matches implementation, and comprehensive cross-format conversion testing against local registry

Use when starting infrastructure, testing, deployment, or framework-specific tasks - automatically searches PRPM registry for relevant expertise packages and suggests installation to enhance capabilities for the current task

Interactive browser automation via Chrome DevTools Protocol. Use when you need to interact with web pages, test frontends, or when user interaction with a visible browser is required.

Enforce evidence-based completion verification by requiring fresh execution of verification commands and confirmation of output before making any success claims, ensuring work is genuinely complete rather than assumed complete. Use this skill when about to claim that work is complete, finished, or done, when about to state that tests are passing or a test suite succeeds, when preparing to commit changes to version control, when about to create pull requests or merge requests, when claiming that a bug has been fixed or resolved, when stating that build processes succeed or compile without errors, when reporting that linting, formatting, or code quality checks pass, when delegating work to agents and receiving success reports that need independent verification, when moving from one task to the next in a multi-step implementation, when about to use words like "should work", "probably works", "seems to", "looks correct", or other qualifying language that implies uncertainty, when feeling satisfied with work and r

Apply systematic four-phase debugging methodology (root cause investigation, pattern analysis, hypothesis testing, implementation) that ensures thorough understanding before attempting solutions, preventing random fixes and reducing debugging time from hours to minutes. Use this skill when encountering any test failures in test suites (Jest, pytest, RSpec, JUnit, Go testing), when production bugs are reported or discovered, when code produces unexpected output or behavior different from requirements, when experiencing build failures or compilation errors, when integration tests fail due to component interaction issues, when performance problems or slowdowns are detected, when encountering race conditions, timing issues, or intermittent failures, when error messages or stack traces appear in logs or console output, when refactoring causes existing tests to fail, when you've already attempted one or more fixes that didn't resolve the issue, when deployment or CI/CD pipelines fail, when you're tempted to make a

Prevent common testing anti-patterns that undermine test effectiveness and code quality by ensuring tests verify real behavior rather than mock behavior, keeping production code free from test-only pollution, and enforcing thoughtful mocking strategies. Use this skill when writing or modifying any test files (.test.ts, .test.js, .spec.ts, _test.py, test_*.py, *_test.go, *_spec.rb), when adding mock objects, stubs, spies, or test doubles to test suites, when considering adding methods or properties to production classes that are only called from test code, when setting up complex test fixtures or test data, when tests are failing and you're tempted to adjust mocks to make them pass, when deciding how to isolate code under test from external dependencies, when implementing dependency injection or test seams, during code reviews when reviewing test implementation and mocking strategies, when refactoring tests that have become brittle or hard to maintain, when test setup code is becoming longer than the actual test assertions, or when choosing between integration tests with real components versus unit tests with mocks.

Write focused tests for core user flows and critical paths with clear test names, behavior-focused assertions, mocked external dependencies, and fast execution, deferring edge case testing until explicitly required. Use this skill when creating or modifying test files, writing unit tests, integration tests, or test cases for any feature. Apply when writing test files (test/, __tests__/, spec/, .test.js, .spec.ts, test_*.py), implementing tests for core user workflows, testing critical business logic, mocking external dependencies (databases, APIs, file systems), writing descriptive test names, creating fast-running unit tests, or adding tests at logical completion points of feature development. Use for any task involving test creation, test coverage, test strategy, or test-driven development.

Build responsive, mobile-first layouts using fluid containers, flexible units, media queries, and touch-friendly design that works across all screen sizes. Use this skill when creating or modifying UI layouts, responsive grids, breakpoint styles, mobile navigation, or any interface that needs to adapt to different screen sizes. Apply when working with responsive CSS, media queries, viewport settings, flexbox/grid layouts, mobile-first styling, breakpoint definitions (mobile, tablet, desktop), touch target sizing, relative units (rem, em, %), image optimization for different screens, or testing layouts across multiple devices. Use for any task involving multi-device support, responsive design patterns, or adaptive layouts.