Development Skills
Build software, MCP servers, and web apps.
MCP Builder
by Anthropic
Guidance for building high-quality MCP servers that expose external APIs to LLMs through well-designed tools, in Python (FastMCP) or Node/TypeScript.
Skill Creator
by Anthropic
Create, edit, and optimize Agent Skills — scaffold new skills, refine existing ones, run evals, and tune descriptions for reliable triggering.
Frontend Design
by Anthropic
Guidance for distinctive, intentional UI design — aesthetic direction, typography, and choices that avoid looking like templated defaults.
Web App Testing
by Anthropic
Interact with and test local web applications using Playwright — verify frontend behavior, debug UI, capture screenshots, and read browser logs.
Web Artifacts Builder
by Anthropic
A suite for building elaborate, multi-component HTML artifacts with modern frontend tooling — React, Tailwind CSS, and shadcn/ui.
Claude API Reference
by Anthropic
Authoritative reference for the Claude API and Anthropic SDKs — model IDs, pricing, parameters, streaming, tool use, MCP, agents, prompt caching, and token counting.