Anthropic

Anthropic's public repository of Agent Skills: self-contained folders with a SKILL.md that Claude loads dynamically to perform specialized tasks like document creation and MCP server generation.

Create algorithmic and generative art with p5.js using seeded randomness and interactive parameter exploration — flow fields, particle systems, and more.

Apply Anthropic's official brand colors and typography to any artifact that benefits from a consistent company look-and-feel.

Create beautiful static visual art as .png and .pdf — posters, designs, and artwork — guided by a design philosophy.

TypeScript framework for building custom AI agents powered by Claude Code, supporting one-off queries, interactive client sessions, custom tools, and hooks.

Python framework for building custom AI agents on top of Claude Code, with query() for one-off tasks and ClaudeSDKClient for interactive sessions, custom tools, and hooks.

Reference for building with the Claude API / Anthropic SDK: models, params, streaming, tool use, MCP, caching, and token counting.

Agentic coding tool that lives in your terminal, understands your codebase, and executes routine tasks, explains code, and handles git workflows via natural language.

Official Go-based CLI for the Claude Developer Platform / Claude API, distinct from the agentic Claude Code tool.

Anthropic-managed directory of high-quality Claude Code plugins, including internal Anthropic plugins and vetted third-party submissions, that extend Claude Code with commands, agents, and MCP servers.

Guide a structured workflow for co-authoring documentation, proposals, technical specs, and decision docs through iterative refinement.

Create, read, edit, and manipulate Word (.docx) documents, including tables of contents, headings, and professional formatting.

Create distinctive, production-grade frontend interfaces with high design quality — components, pages, and full applications.

Write internal communications — status reports, leadership updates, newsletters — in the formats a company prefers.

Guide for building high-quality MCP servers in Python (FastMCP) or Node/TypeScript (MCP SDK) to integrate external APIs and services.

Work with PDF files: extract text and tables, merge and split, rotate, watermark, fill forms, encrypt, and create new PDFs.

Create, read, and edit PowerPoint (.pptx) decks — slide decks, pitch decks, and presentations — or extract their content.

Create, modify, and improve Agent Skills, and measure their performance with evals, benchmarks, and variance analysis.

Create animated GIFs optimized for Slack, with constraints, validation tools, and animation concepts.

Style artifacts — slides, docs, HTML landing pages — with one of 10 preset themes or a theme generated on the fly.

Build elaborate multi-component claude.ai HTML artifacts with React, Tailwind CSS, and shadcn/ui — for artifacts needing state, routing, or components.

Interact with and test local web apps via Playwright: verify frontend behavior, debug UI, capture screenshots, and view browser logs.

Open, read, edit, and create spreadsheets (.xlsx, .xlsm, .csv, .tsv) — formulas, formatting, charts, and data cleaning.