Testing & Security

Repomix AI-friendly codebase compression configuration (.repomix.config.json) template and validation logic. Achieves 70% token reduction through XML compression and repository-type-specific include patterns. Includes 5 critical standards (XML output format, include patterns by repo type, gitignore integration, exclude patterns, security checks). Use when creating or auditing .repomix.config.json files for optimal LLM context compression.

AI-friendly architecture patterns for TypeScript projects including Domain-Driven Design, Clean Architecture, Hexagonal Architecture, and Page Object Model testing patterns

Generate high-quality synthetic datasets using statistical samplers and Claude's native LLM capabilities. Use when users ask to create synthetic data, generate datasets, create fake/mock data, generate test data, training data, or any data generation task. Supports CSV, JSON, JSONL, Parquet output. Adapted from NVIDIA NeMo DataDesigner (Apache 2.0).

Email template development with React Email and Tailwind CSS. Use when creating or modifying email templates, testing email rendering, or building email HTML from React components.

End-to-end testing with Playwright for web applications. Use when writing E2E tests, browser automation, visual regression testing, or debugging test failures. Triggers on Playwright, E2E, browser testing, or test automation questions.

보안 리뷰 수행. 취약점 점검, OWASP Top 10, 시크릿 노출, 의존성 보안 검토

Implements features using Test-Driven Development methodology following the red-green-refactor cycle. Use when user explicitly requests TDD approach or asks to implement features test-first.

Complete guide for Chrome DevTools CLI - browser automation, debugging, performance analysis, network inspection. Use when automating Chrome, taking screenshots, analyzing performance, monitoring network/console, device emulation, or user mentions chrome-devtools, browser automation, puppeteer, debugging, performance testing, screenshot, network monitoring, console monitoring, or 크롬 개발자도구, 브라우저 자동화, 디버깅, 성능 분석.

Minimal CLI tools for Linear issue management. Use when you need to list issues, view workflow states, change issue status, or move issues between teams. Tools use Linear's GraphQL API with personal API key authentication.

Scaffold API mocking infrastructure using Mountebank and Testcontainers for reliable integration testing.

Create a new entity ViewModel with property ViewModels following Phoenix MVVM patterns. Use when adding new data models, creating entity wrappers, or scaffolding ViewModels for entities. Handles property VM creation, label converters, base class selection, and test generation.

Use git worktrees for parallel Claude Code workflows. Run multiple Claude instances on different features simultaneously without merge conflicts. Use for parallel development, multi-branch testing, and subagent workflows.

Production deployment patterns for Composable Svelte SSR applications. Use when deploying to Fly.io, Docker, or any cloud platform. Covers multi-stage Docker builds, Fly.io configuration, security hardening, performance optimization, and integration with Composable Rust backends.

Comprehensive security best practices, vulnerability scanning, and security guidance for development workflows with automated security checks and compliance monitoring.

Integrates SonarQube for continuous code quality analysis. Configures server setup, GitHub Actions workflows, quality gates, and security scanning (SAST, DAST, SCA).

Implements security features following OWASP guidelines. Use when validating input, preventing XSS, adding rate limiting, verifying auth, or handling file uploads. Includes security-utils, sanitize-utils, and rate-limiter patterns.

Evaluate and upgrade test suites with TDD/BDD rigor, coverage tracking, and reproducible evidence.

PostCSS configuration template and validation logic for Tailwind CSS processing with Autoprefixer. Includes 4 required standards (required base plugins, critical plugin order with tailwindcss first and autoprefixer last, file naming as postcss.config.js, required dependencies). Use when creating or auditing postcss.config.js files to ensure correct CSS build pipeline.

Access official Claude Code documentation including comprehensive guides on hooks, MCP servers, agent skills, slash commands, settings, CLI reference, security, memory, plugins, and troubleshooting. Use when the user asks about Claude Code features, configuration, capabilities, or best practices. ALWAYS use this skill instead of guessing about Claude Code functionality - it contains the authoritative documentation from docs.anthropic.com with automatic updates. Also includes comprehensive skill creation guide with helper scripts when users want to create new skills.

Main TDD workflow command. Finds next test in PLAN.md and executes complete TDD cycle automatically. This is the primary command for TDD development as specified in CLAUDE.md.