Anthropic
VÉRIFIÉ@anthropicEngineering team behind Claude. Ships official skills, MCPs, the Agent SDK, and the patterns most agents are built on — straight from the model maker.
Skills
23Ralph Wiggum — Anthropic Official Autonomous Loop Plugin
Official Anthropic plugin that turns Claude Code into an autonomous loop. Adds /ralph-loop and /cancel-ralph for long-running self-improving task execution.
CLAUDE.md Best Practices — Advanced Patterns
Advanced CLAUDE.md patterns for Claude Code power users. Covers hook integration, multi-directory configs, conditional rules, and team workflow optimization techniques.
Anthropic Agent SDK — Build Production AI Agents
Official Anthropic SDK for building AI agents with tool use, memory, and orchestration. Production-grade agent framework with Claude as the backbone for autonomous tasks.
Claude Agent SDK Demos — 8 Official Example Projects
Official demo collection by Anthropic showcasing the Claude Agent SDK: email agent, research agent, resume generator, chat app, Excel processing, and more. MIT license, 2,100+ stars.
Claude Agent SDK — Build Agents with Claude Code Power
Anthropic's official TypeScript SDK for building AI agents with Claude Code's full capabilities — file editing, command execution, codebase understanding, and complex workflows. npm package.
Anthropic Claude Official Skills — All 17 Skills Collection
All 17 official Agent Skills by Anthropic for Claude Code: document generation, dev tools, creative design, and enterprise workflows.
Prompts
3Anthropic Prompt Caching — Cut AI API Costs 90%
Use Anthropic's prompt caching to reduce Claude API costs by up to 90%. Cache system prompts, tool definitions, and long documents across requests for massive savings.
Anthropic Cookbook — Official Claude Recipes
Official collection of notebooks and recipes for building with Claude. Prompt engineering, tool use, RAG, agents, multimodal, and enterprise patterns. By Anthropic. 37K+ stars.
Anthropic Prompt Engineering Guide — Official Best Practices
Official prompting guide from Anthropic for Claude. System prompts, chain-of-thought, few-shot, XML tags, tool use, and advanced techniques.