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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.
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.
Multi-language Workers development with Rust, Python, and WebAssembly. Use when building Workers in languages other than JavaScript/TypeScript, or when integrating WASM modules for performance-critical code.
TypeScript architecture design specialist for strict type safety, decorator and metadata programming, type-safe configuration, and module-level type contracts — use when architecting shared types, hardening type safety, or designing enterprise-grade TypeScript patterns for NestJS, Angular, or MCP servers.
Implements mutation testing support for new programming languages using tree-sitter grammars and the LanguageEngine trait. Triggers on "add language support", "add [language] support", "implement [language]", "new language", or mentions of specific languages like Python, TypeScript, C++, Java.
TypeScript infrastructure specialist for monorepo project references, type performance diagnostics (tsc --extendedDiagnostics), ESM/CJS interop, strict mode migration, and .d.ts authoring — use for project-level TypeScript decisions, not implementation patterns.
Enforces TheOne Studio Cocos Creator development standards including TypeScript coding patterns, Cocos Creator 3.x architecture (Component system, EventDispatcher), and playable ads optimization guidelines. Triggers when writing, reviewing, or refactoring Cocos TypeScript code, implementing playable ads features, optimizing performance/bundle size, or reviewing code changes.
Enforces TheOne Studio React Native development standards including TypeScript patterns, React/Hooks best practices, React Native architecture (Zustand/Jotai, Expo Router), and mobile performance optimization. Triggers when writing, reviewing, or refactoring React Native code, implementing mobile features, working with state management/navigation, or reviewing pull requests.
Build with MPP (Machine Payments Protocol) - the open protocol for machine-to-machine payments over HTTP 402. Use when developing paid APIs, payment-gated content, AI agent payment flows, MCP tool payments, pay-per-token streaming, or any service using HTTP 402 Payment Required. Covers the mppx TypeScript SDK with Hono/Express/Next.js/Elysia middleware, pympp Python SDK, and mpp Rust SDK. Supports Tempo stablecoins, Stripe cards, Lightning Bitcoin, and custom payment methods. Includes charge (one-time) and session (streaming pay-as-you-go) intents. Make sure to use this skill whenever the user mentions mpp, mppx, machine payments, HTTP 402 payments, Tempo payments, payment channels, pay-per-token, paid API endpoints, or payment-gated services.
Design and maintain TypeScript packages in a monorepo, including exports and build configuration.
Build Yo libraries for WebAssembly and publish as npm packages. Use this when working with WASM targets, Emscripten, WASI, npm packaging, JavaScript/TypeScript wrappers, or browser/Node.js integration.
Expert guidance for Nuxt 4 projects with app/ directory structure, Vue 3 Composition API, TypeScript, Vitest, ESLint, and Tailwind CSS 4 with Vite plugin. Use when creating components, composables, tests, or any frontend code. Enforces Tailwind-only styling (no inline styles or custom CSS). Supports Nuxt layers.
Create a new React component following Lab's architecture patterns. Determines component scope (core vs. page-scoped), generates proper structure with TypeScript types, creates Storybook stories for core components, and ensures composability with existing components.
Guide for running inline TypeScript scripts with Bun
Type-safe ORM for Cloudflare D1 databases using Drizzle. Provides patterns for schema definition, migrations, and type-safe queries. Prevents transaction errors and schema mismatches. Includes templates for strict TypeScript usage.
Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).
Engineer effective LLM prompts using zero-shot, few-shot, chain-of-thought, and structured output techniques. Use when building LLM applications requiring reliable outputs, implementing RAG systems, creating AI agents, or optimizing prompt quality and cost. Covers OpenAI, Anthropic, and open-source models with multi-language examples (Python/TypeScript).
Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).
Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).
