1
Anthropic's official collection of Agent Skills, including document, design and developer skills
★ 179k · +1.2k this week · Apache-2.0 + proprietary · updated 2026-09-29
9.2/10
What it does This is Anthropic's own public repository of Agent Skills. It serves two purposes: it ships working skills you can install today, and it is the reference for how a skill is put together. Each skill is a folder with a SKILL.md file (YAML front matter with a name and a description, then instructions), optionally joined by scripts… Read more →
Pros
- Official and well maintained
- Reference implementation of the SKILL.md format
- Covers documents, design, testing and MCP
Cons
- Some skills are examples rather than production-ready
- Document skills are source-available, not open source
Pricing: Free · official skills
2
A skill for writing new skills: structure, descriptions and testing
★ 179k · +1.2k this week · Apache-2.0 · updated 2026-09-29
8.4/10
What it does Skill Creator is the skill in Anthropic's official repository for building new Agent Skills and improving existing ones. When you ask the agent to turn a workflow into a skill, the skill guides it through the whole job. The agent first works out what the skill should do. It then writes the SKILL.md, runs test prompts with… Read more →
Pros
- Turns repeated prompts into reusable skills
- Encodes Anthropic best practices
Cons
- Most useful after you know what to automate
Pricing: Free · skills meta
3
The open SKILL.md standard: specification, docs and a reference validator
★ 26k · +172 this week · Apache-2.0 · updated 2026-08-09
8.2/10
What it does This is the home of the Agent Skills open format: the specification, the documentation behind agentskills.io and a small reference library. Anthropic first developed the format and later released it as an open standard. The repository does not ship ready-made skills for daily coding work. It defines what a skill is, so that one skill folder works… Read more →
Pros
- Authoritative definition of the format every skills-compatible agent reads
- skills-ref CLI validates skills and generates the available_skills prompt block
Cons
- Contains no ready-to-use skills; the reference library is labelled demo-only
Pricing: Open source · agent-skills specification skill-md open-standard validator