The Anthropic Skills Repo Most Devs Are Sleeping On

Anthropic quietly published an official skills repository on GitHub. It already has 117,000+ stars. You install it in Claude Code with one command. Most tutorials skip it. Here's what's inside, why it matters, and how to plug it in.

The repo nobody told you about

If you've spent any time learning Claude Code over the last few months, you probably watched ten YouTube videos, installed five random plugins, and ended up more confused than when you started.

Here's the thing. Anthropic, the company that builds Claude, has its own public repository on GitHub: anthropics/skills.

It's at 117,000+ stars as of May 2026. It's the official starting point. And almost no tutorial mentions it.

This is the repo: github.com/anthropics/skills

What's actually inside

The repository contains Agent Skills. Skills are folders of instructions, scripts, and templates that Claude loads on demand to handle specific tasks better. Anthropic introduced the format in October 2025 and released it as an open standard in December 2025. It's now supported by Claude Code, Claude.ai, the Claude API, OpenAI Codex, Cursor, Gemini CLI, Antigravity, and Windsurf.

Inside the repo you get four buckets:

  • Document skills. The same skills that power Claude's file creation feature in production. Word documents (docx), PowerPoint (pptx), Excel (xlsx), and PDF generation. These are the source code Anthropic actually uses.
  • Creative and design skills. Art, music, design templates. Useful as references for building your own creative workflows.
  • Development and technical skills. Web app testing, MCP server generation, prompt engineering best practices.
  • Enterprise and communication skills. Internal communications, branding, lead research, brand guidelines.

Each skill is one folder with a SKILL.md file. YAML frontmatter on top, Markdown instructions below. That's it. You can read them, fork them, modify them, and ship your own.

Why this matters more than another tutorial

Three reasons.

One. Skills load progressively. At session start, Claude only sees the skill name and description, roughly 100 tokens per skill. The full instructions load only when Claude decides the skill is relevant. This is what lets a single agent host hundreds of skills without bloating its context window.

Two. The format is now an open standard. A skill you build for Claude Code works in Codex, Cursor, Gemini CLI, and Windsurf. You're not locked into one vendor.

Three. Claude Code is the leading AI coding tool right now. According to the Pragmatic Engineer Survey from February 2026 (15,000 developers), Claude Code holds 75% adoption among small companies and startups. It hit a $2.5 billion annualized run-rate in early 2026 and reached $1 billion in just six months after launch, faster than any AI coding tool in history. 46% of developers named it their "most loved" tool, more than double Cursor and five times GitHub Copilot.

Translation: this repo is where the leading tool's official patterns live. Skip the random tutorials. Start here.

How to install it in Claude Code

One command in your Claude Code session:

/plugin marketplace add anthropics/skills

Then:

  • Type /plugin and select Browse and install plugins
  • Pick anthropic-agent-skills
  • Choose either document-skills or example-skills
  • Click Install now

Or install directly:

/plugin install document-skills@anthropic-agent-skills /plugin install example-skills@anthropic-agent-skills

After installation you just mention what you want. Example: "Use the PDF skill to extract form fields from report.pdf." Claude Code finds the right skill, loads it, runs it.

How to actually use this in practice

Three workflows that work for me.

Workflow 1. Read before you build. Before creating your own skill, read three or four examples from the repo. The patterns repeat. You'll save hours.

Workflow 2. Fork and modify. Don't write skills from scratch. Find the closest example, fork it, modify the instructions for your use case. The template-skill folder in the repo is the cleanest starting point.

Workflow 3. Use document skills as production reference. If you're building anything that creates Word, Excel, PowerPoint, or PDF files, the docx, xlsx, pptx, and pdf skills in this repo are the actual production code Anthropic uses. They handle edge cases you wouldn't think of.

What to do next

  • Star the repo: github.com/anthropics/skills
  • Install the plugin in Claude Code with the command above
  • Pick one document skill and read its SKILL.md end to end
  • Build your first custom skill using the template