---
id: concept:agentskills-io-standard
type: concept
title: agentskills.io Open Standard
status: active
confidence: 0.7
sources:
  - 2026-05-09-cybersec-library-overview.md
created: 2026-05-09
updated: 2026-05-09
updated_log:
  - 2026-05-09: created
tiers: semantic
half_life_days: 180
tags: [standard, portability, agent-integration]
---

# agentskills.io Open Standard

## Summary

[agentskills.io](https://agentskills.io) is the open standard that defines how a portable "skill" is encoded for AI agents — YAML frontmatter for sub-second discovery, structured Markdown for step-by-step execution, and reference files for deep technical context. The [[concept:cybersec-skill-library]] follows this standard end-to-end, which is why all 754 skills work zero-config across 26+ AI platforms (Claude Code, Copilot, Cursor, Gemini CLI, Cline, MCP-compatible agents). The standard is what makes the [[pattern:skill-anatomy]] portable.

## Claims

- agentskills.io is an open standard for portable agent skills, with a website at agentskills.io. `[src: raw/2026-05-09-cybersec-library-overview.md] {conf: 0.7}`
- The standard prescribes YAML frontmatter for sub-second discovery, structured Markdown for step-by-step execution, and reference files for deep technical context — the AI-native knowledge-base format. `[src: raw/2026-05-09-cybersec-library-overview.md] {conf: 0.7}`
- All platforms that support the agentskills.io standard can load the library's skills with zero configuration. `[src: raw/2026-05-09-cybersec-library-overview.md] {conf: 0.7}`
- Conformance is enforced by the upstream library: every PR is reviewed for technical accuracy and agentskills.io standard compliance within 48 hours. `[src: raw/2026-05-09-cybersec-library-overview.md] {conf: 0.6}`

## Relationships

- composes → [[pattern:skill-anatomy]] `{conf: 0.7}`
- composes → [[concept:cybersec-skill-library]] `{conf: 0.8}`
- complements → [[pattern:installing-skills]] `{conf: 0.6}`

## Open questions

- [ ] Is the standard's full spec captured anywhere in our raw sources? (Currently we only have the library's README references — no direct spec capture.)

## Changelog

- 2026-05-09 — created