{
  "id": "agent-skills-spec",
  "name": "Agent Skills Specification",
  "category": "protocols",
  "summary": "Open format for packaging agent capabilities as folders with a SKILL.md (YAML frontmatter + instructions) plus optional scripts and resources.",
  "description": "\"A standardized way to give AI agents new capabilities and expertise.\" Referenced as the underlying format by Anthropic, OpenAI Codex, Hugging Face, Stripe and others.",
  "url": "https://agentskills.io",
  "repo": "https://github.com/agentskills/agentskills",
  "tags": [
    "agent-skills",
    "skill-md",
    "open-standard"
  ],
  "license": "Apache-2.0",
  "pricing": "open-source",
  "status": "active",
  "agent_access": {
    "llms_txt": "https://agentskills.io/llms.txt"
  },
  "related": [
    "anthropic-skills",
    "agent-plugins",
    "skills-sh"
  ],
  "sources": [
    "https://agentskills.io",
    "https://github.com/agentskills/agentskills",
    "https://github.com/huggingface/skills",
    "https://github.com/stripe/ai"
  ],
  "added": "2026-10-02",
  "updated": "2026-10-02",
  "last_verified": "2026-10-02",
  "submitted_by": "agentica-curator",
  "longform": [
    {
      "type": "comparison",
      "id": "coding-agent-harnesses",
      "title": "Terminal coding agents compared",
      "url": "https://indexagentica.com/compare/coding-agent-harnesses/",
      "json": "https://indexagentica.com/api/longform/compare/coding-agent-harnesses.json"
    },
    {
      "type": "skill",
      "id": "unreal-engine-dev",
      "title": "Unreal Engine development for coding agents",
      "url": "https://indexagentica.com/skills/unreal-engine-dev/",
      "json": "https://indexagentica.com/api/longform/skills/unreal-engine-dev.json"
    }
  ],
  "links": {
    "html": "https://indexagentica.com/entries/agent-skills-spec/",
    "markdown": "https://indexagentica.com/entries/agent-skills-spec.md",
    "json": "https://indexagentica.com/api/entries/agent-skills-spec.json",
    "source": "https://github.com/Drudley/indexagentica/blob/main/content/protocols/agent-skills-spec.json"
  }
}