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# official Anthropic skills

the 17 skills in [anthropics/skills](https://github.com/anthropics/skills) (115k+ stars) plus the skills bundled with Claude Code itself. these are the most reliable skills in the ecosystem — they come from the team that builds Claude.

## bundled with Claude Code

these ship with every Claude Code install. always available, no setup:

| skill | what it does |
|-------|-------------|
| `/simplify` | reviews recently changed code for reuse, quality, efficiency — then fixes |
| `/batch` | orchestrates large-scale changes across a codebase, 5-30 parallel worktree agents |
| `/debug` | structured debugging workflow |
| `/loop` | runs a prompt repeatedly on a schedule |
| `/claude-api` | loads Claude API + SDK reference |

## the official repo

three installable plugins bundle the 17 skills:

### document skills (source-available, proprietary license)

these power Claude's built-in document features. not open source, but you can read the code.

- **docx** — create, edit, analyze Word documents. tracked changes, comments, formatting, TOC. uses docx-js + XML.
- **pdf** — full PDF processing: extract, create, merge, split, watermark, OCR, encrypt, fill forms. uses pypdf.
- **pptx** — create, read, edit PowerPoint slides. uses pptxgenjs for creation, XML for editing.
- **xlsx** — spreadsheet manipulation: formulas, charts, data transformations. enforces professional formatting and color-coding (blue=inputs, black=formulas, green=cross-sheet links).

### creative & design skills

- **frontend-design** — production-grade UI. explicitly bans generic "AI slop" aesthetics — picks bold aesthetic directions and executes with precision. **110k+ weekly installs, most popular skill in the ecosystem.** see also [[design-and-frontend]].
- **algorithmic-art** — generative art with p5.js: seeded randomness, flow fields, particle systems. outputs a "philosophy manifesto" then expresses it as HTML+JS sketches.
- **canvas-design** — visual art as PNG and PDF. two-step: design philosophy creation, then visual expression.
- **web-artifacts-builder** — complex claude.ai HTML artifacts with React 18 + TypeScript + Vite + Tailwind + shadcn/ui.
- **theme-factory** — 10 pre-set professional themes (color palettes + font pairings) for any artifact.
- **brand-guidelines** — Anthropic's official brand colors and typography.
- **slack-gif-creator** — animated GIFs optimized for Slack size constraints.

### development & technical skills

- **claude-api** — build, debug, optimize apps with Claude API / Anthropic SDKs. covers Python, TypeScript, Ruby, Java, Go, PHP, C#, cURL. includes Managed Agents reference. the most extensively structured skill (8 language subdirectories).
- **mcp-builder** — guide for creating MCP servers in Python (FastMCP) or TypeScript (MCP SDK). see [[tooling]].
- **webapp-testing** — test local web apps using Python Playwright. includes server lifecycle management, screenshots, DOM inspection. see [[development]].
- **skill-creator** — meta-skill for creating, modifying, and benchmarking other skills. includes eval framework and description optimizer. see [[creating-skills]].

### enterprise & communication

- **internal-comms** — templates for 3P updates, newsletters, FAQs, status reports, incident reports.
- **doc-coauthoring** — three-stage co-authoring workflow: context gathering → iterative refinement → reader testing with a fresh Claude to catch blind spots. the only Apache 2.0 licensed communication skill.