Unit Testing

Generate Jest unit tests for JavaScript/TypeScript with mocking, coverage. Use for JS/TS modules, React components, test generation, or encountering missing coverage, improper mocking, test structure errors.

Mobile app testing with unit tests, UI automation, performance testing. Use for test infrastructure, E2E tests, testing standards, or encountering test framework setup, device farms, flaky tests, platform-specific test errors.

TDD workflow and test strategy patterns including test pyramid, coverage strategies, mocking approaches, and anti-patterns. Load when writing tests, designing test strategies, or reviewing test coverage.

Use for mock functions in Bun tests, spyOn, mock.module, implementations, and test doubles.

Browser automation and E2E testing with Playwright. Auto-detects dev servers, writes clean test scripts. Test pages, fill forms, take screenshots, check responsive design, validate UX, test login flows, check links, automate any browser task. Use for cross-browser testing, visual regression, API testing, component testing in TypeScript/JavaScript and Python projects.

Run tests, linting, and quality checks for WooCommerce development. Use when running tests, fixing code style, or following the development workflow in WooCommerce projects.

Browser automation, web scraping, and visual testing with Playwright on Display :1. Use for navigating web pages, clicking elements, filling forms, taking screenshots, executing JavaScript, and visual verification of web applications. Visual access available via VNC on port 5901.

Consult external AIs (Gemini 2.5 Pro, OpenAI Codex, Claude) for second opinions. Use for debugging failures, architectural decisions, security validation, or need fresh perspective with synthesis.

Production-tested setup for Tailwind CSS v4 with shadcn/ui, Vite, and React.Use when: initializing React projects with Tailwind v4, setting up shadcn/ui,implementing dark mode, debugging CSS variable issues, fixing theme switching,migrating from Tailwind v3, or encountering color/theming problems.Covers: @theme inline pattern, CSS variable architecture, dark mode withThemeProvider, component composition, vite.config setup, common v4 gotchas,and production-tested patterns.Keywords: Tailwind v4, shadcn/ui, @tailwindcss/vite, @theme inline, dark mode,CSS variables, hsl() wrapper, components.json, React theming, theme switching,colors not working, variables broken, theme not applying, @plugin directive,typography plugin, forms plugin, prose class, @tailwindcss/typography,@tailwindcss/forms

Comprehensive skill for Product Managers to create organize and manage Product Teams, Strategy, PRDs, release plans, user stories, and standalone issues with high-quality acceptance criteria. Supports both full documentation workflows (PRD → Plan → Stories) and quick issue creation (standalone stories, tasks, bugs). All documentation follows design-driven development principles with functional, testable acceptance criteria based on visual designs and user flows.

Identify and resolve technical debt with focus on finding and cataloging issues. Use when asked to find code smells, audit TODOs, identify complexity, improve code quality, or assess technical debt. Triggers on: "use tech-debt mode", "tech debt", "find TODOs", "code smells", "technical debt audit", "find complexity", "code quality audit". Full access mode - can modify files and run tests.

Deploy production recommendation systems with feature stores, caching, A/B testing. Use for personalization APIs, low latency serving, or encountering cache invalidation, experiment tracking, quality monitoring issues.

Expert guidance for writing Python tests with pytest and unittest. Use when writing tests, debugging test failures, or improving test coverage for Python projects.

Type-safe ORM for Cloudflare D1 databases using Drizzle. Use when: building D1 database schemas, writing type-safe SQL queries, managing migrations with Drizzle Kit, defining table relations, implementing prepared statements, using D1 batch API, or encountering D1_ERROR, transaction errors, foreign key constraint failures, or schema inference issues.Keywords: drizzle orm, drizzle d1, type-safe sql, drizzle schema, drizzle migrations,drizzle kit, orm cloudflare, d1 orm, drizzle typescript, drizzle relations, drizzle transactions,drizzle query builder, schema definition, prepared statements, drizzle batch, migration management,relational queries, drizzle joins, D1_ERROR, BEGIN TRANSACTION d1, foreign key constraint,migration failed, schema not found, d1 binding error, schema design, database indexes, soft deletes,uuid primary keys, enum constraints, performance optimization, naming conventions, schema testing

This skill helps launch and configure the Chrome DevTools MCP server, giving Claude visual access to a live browser for debugging and automation. Use when the user asks to set up browser debugging, launch Chrome with DevTools, configure chrome-devtools-mcp, see what my app looks like, take screenshots of my web application, check the browser console, debug console errors, inspect network requests, analyse API responses, measure Core Web Vitals or page performance, run a Lighthouse audit, test button clicks or form submissions, automate browser interactions, fill out forms programmatically, simulate user actions, emulate mobile devices or slow networks, capture DOM snapshots, execute JavaScript in the browser, or troubleshoot Chrome DevTools MCP connection issues. Supports Windows, Linux, and WSL2 environments.

Use for test coverage with Bun, --coverage flag, lcov reports, thresholds, and CI integration.

HTTP API testing for TypeScript (Supertest) and Python (httpx, pytest). Test REST APIs, GraphQL, request/response validation, authentication, and error handling.

Expert regex pattern generation, optimization, testing, and explanation using deterministic AST-based construction. Use when user needs to create, test, optimize, or understand regex patterns, parse CLI commands, validate inputs, or build complex text matching patterns.

Generates new agent profiles with consistent structure, automatic validation pattern injection, and test-driven protocols

Modern TypeScript/JavaScript testing with Vitest. Fast unit and integration tests, native ESM support, Vite-powered HMR, and comprehensive mocking. Use for testing TS/JS projects.