anthropics/skills (official Agent Skills repository)
Anthropic’s official public repository for Agent Skills — the reference
implementation, the specification itself (./spec/), a skill ./template/, and a Claude Code
plugin marketplace (.claude-plugin/). First-party project repo, so tier T1. It’s the canonical
home of the standard the spoke already pages as agentskills-spec: the same vendor that asks others
to adopt the format publishes the spec and a worked set of skills to copy from. URL-only ingest.
(~151k stars at ingest — a dated popularity snapshot, not a load-bearing claim.)
What’s in it
- The spec (
./spec/) — the Agent Skills specification, following the agentskills.io standard: aSKILL.mdwithname+descriptionfrontmatter and an instruction body, the same shape the spoke documents. - Example skills by category — creative/design, development (testing web apps, MCP-server
generation), enterprise/communication, and the document skills (
docx,pdf,pptx,xlsx). - Template + marketplace — a starter skill and the plugin-marketplace config that lets Claude
Code install bundles (
/plugin marketplace add anthropics/skills).
Licensing — two tiers
Most skills are Apache-2.0 (open source). The document skills (docx/pdf/pptx/xlsx) are source-available, not open source — and they are the reference implementations that power Claude’s production document capabilities. So the repo mixes copy-freely examples with a look-but- license-bound view of skills that actually ship.
Why it matters here
- The standardization thread gets its first-party anchor. agentskills-spec is the cross-vendor format; this repo is Anthropic’s own canonical instance of it — spec, template, and examples in one place. It’s strong evidence on the open standardization-reach question: a major vendor isn’t just supporting the format, it’s the one publishing it.
- Production skills, not just demos. The document skills are the markdown procedures behind Claude’s real file-handling — a concrete case of the spoke’s core claim, capability as portable markdown an agent loads (agent-skills), shipping in a product rather than a README.
- A first-party distribution channel. The plugin marketplace gives the skills-as-packages thread (node-js-functional-patterns-skill, Hermes’ Skills Hub on hermes-agent) an official storefront, alongside the third-party marketplaces.
- Caveat: the repo’s own disclaimer says the skills are for demonstration/education and may differ from Claude’s live behavior — so treat the examples as reference shape, not exact production internals.
Related
agentskills-spec · agent-skills · claude-agent-sdk · anthropic · node-js-functional-patterns-skill · hermes-agent · synthesis