TypeScript

The e2e-testing skill is a Playwright-focused guide for stable end-to-end test automation, with patterns for file organization, Page Object Model usage, configuration, CI readiness, artifact debugging, and flaky-test handling.

repo-scan is a cross-stack source audit skill that classifies files, detects embedded third-party libraries, and helps you judge what is core, duplicated, or dead weight. It is useful for repo-scan for Code Review, legacy migrations, and refactor planning. See repo-scan install and repo-scan usage guidance in the skill.

plankton-code-quality is a write-time code quality system for Claude Code. It formats, lints, and can trigger Claude-powered fixes after each file edit, helping catch issues during editing instead of after commit or CI. Ideal for the plankton-code-quality skill, guide, and Code Editing workflows.

nuxt4-patterns is a Nuxt 4 skill for hydration safety, route rules, lazy loading, and SSR-safe data fetching. Use the nuxt4-patterns skill to make better Frontend Development decisions, reduce mismatches, and apply the right pattern for each page or component.

The nodejs-keccak256 skill helps you avoid a common Ethereum bug in JavaScript and TypeScript: using Node's sha3-256 when you need Keccak-256. It is useful for backend development, selectors, event topics, signatures, storage slots, and address derivation, with practical nodejs-keccak256 usage guidance.

The nextjs-turbopack skill helps you use Turbopack in Next.js 16+ for faster local development, HMR, and bundler decisions. Use it as a practical nextjs-turbopack guide for install, usage, and when to switch back to webpack in Frontend Development workflows.

nestjs-patterns is a practical NestJS architecture skill for building modular, production-grade TypeScript backends. It guides module structure, controller and service boundaries, DTO validation, guards, interceptors, config, testing, and the right way to organize code for maintainable Backend Development.

mcp-server-patterns is a practical guide for MCP Server Development with the Node/TypeScript SDK. Learn when to use tools, resources, prompts, Zod validation, and stdio vs Streamable HTTP, with current API notes for safer implementation and debugging.

frontend-patterns is a practical skill for React and Next.js frontend development, helping you choose maintainable patterns for components, state, forms, routing, accessibility, and performance. Use the frontend-patterns guide when you need clear implementation guidance and pattern selection, not just generic best practices.

evm-token-decimals helps prevent silent decimal mismatch bugs across EVM chains. Use it for runtime decimals lookup, chain-aware caching, bridged-token precision drift, and safe normalization for backend development, bots, dashboards, and DeFi tools.

The coding-standards skill gives a baseline for naming, readability, immutability, consistency, and code review across projects, before applying framework-specific rules.

claude-api helps with Anthropic Claude API patterns for Python and TypeScript, including install, messages, streaming, tool use, vision, batches, prompt caching, model selection, and Claude Agent SDK workflows.

The bun-runtime skill helps you choose Bun for new JavaScript or TypeScript projects, Node migration, scripts, tests, and Vercel setups. It covers bun-runtime usage, install guidance, Bun vs Node tradeoffs, and practical workflows for frontend and full-stack development.

Learn the agentic-engineering skill for eval-first execution, task decomposition, model routing, and safer workflow automation with regression checks.

mcp-builder is a practical guide for planning, building, and evaluating MCP servers for external APIs and services. It helps developers choose tool scope, naming, transport, Python or Node implementation patterns, and evaluation workflows so agents can use the server reliably.

claude-api is a practical skill for installing and using the Claude API and Anthropic SDKs. It helps developers choose the right SDK or raw HTTP path, detect language-specific docs, and implement streaming, tool use, files, batches, and error handling with less guesswork.

The fullstack-developer skill is a reusable prompt package for modern JavaScript and TypeScript web app work across React, Next.js, Node.js, APIs, databases, auth, and deployment. It is best for multi-layer planning and implementation, with a single SKILL.md file that defines scope and workflow rather than providing scripts or templates.

browse is a fast headless browser skill for QA, dogfooding, and browser automation. Use it to open pages, interact with elements, verify state, compare before and after actions, capture screenshots, and check responsive layouts, forms, uploads, dialogs, and element states. Install browse when you need browser evidence instead of a generic prompt.

mcp-builder is a guide skill for designing, implementing, and evaluating MCP servers in Python FastMCP or Node/TypeScript, with best practices for agent-friendly tools, schemas, pagination, errors, security, and evaluation.

artifacts-builder helps create complex Claude HTML artifacts as React 18, TypeScript, Vite, Tailwind CSS, and shadcn/ui projects, then bundle them into a single bundle.html. Best for Frontend Development artifacts with state, reusable components, and polished app flows.

tdd is a Test-Driven Development skill for building features, fixing bugs, and writing durable tests with the red-green-refactor loop. It favors behavior-focused tests through public interfaces, boundary-only mocking, and practical guidance for test automation, refactoring, and interface design.

setup-pre-commit helps you add Husky pre-commit hooks with lint-staged, Prettier, and optional typecheck/test runs. Use this setup-pre-commit guide when your repo needs a fast, repeatable pre-commit safety net and you want to preserve existing config while adding the right scripts for the current package manager.

migrate-to-shoehorn helps you replace `as` casts in TypeScript tests with @total-typescript/shoehorn for safer partial fixtures. Use this migrate-to-shoehorn skill when you need to clean up cast-heavy test data, follow the migrate-to-shoehorn guide, or standardize migrate-to-shoehorn for Test Automation.

The prototype skill helps you build throwaway code that answers one concrete question before you commit to a real implementation. Use it to test logic, state transitions, data shape, or UI direction with a runnable prototype that matches the host repo’s conventions. It’s ideal when you need a quick prototype guide, not a final feature.