---
showArticleList: false
title: Skills
created: 2026-09-24
visible: true
status: in progress
tags: [agents, skills]
readability: 3
---

The reusable capability format and its ecosystem: the open spec, the vendor implementations, the harness mechanisms, the optimizer, and the registries and curated packs.

- [Agent Skills open standard](agent-skills-open-standard/index.md) - the agentskills.io spec for SKILL.md capability directories.
- [Agent-Native](agent-native/index.md) - Builder.io's curated pack of fifteen skills plus the app framework they bridge to, the discipline skills portable to any harness.
- [Anthropic Agent Skills](anthropic-agent-skills/index.md) - Anthropic's SKILL.md folder format for reusable agent capabilities.
- [OpenCode skills and plugins](opencode-skills-and-plugins/index.md) - OpenCode's two extension mechanisms: skills for the model, plugins for the harness.
- [SkillOpt](skillopt/index.md) - Microsoft Research's optimizer that trains skill markdown against held-out validation, skills as trainable parameters.
- [skills.sh](skills-sh/index.md) - Vercel's directory and leaderboard for the open skills ecosystem.

Its members are compared on shared rows in the [Skills Feature Matrix](skills-feature-matrix/index.md).

## Changes

- 2026-08-24 - Added Agent Skills open standard.
- 2026-08-24 - Added Anthropic Agent Skills.
- 2026-08-24 - Added OpenCode skills and plugins.
- 2026-08-24 - Added skills.sh.
- 2026-08-30 - Added SkillOpt.
- 2026-09-13 - Added Agent-Native.