Official Skill Collections for OpenAI Codex
Agent Skills published by the companies behind the models and tools: well maintained and a safe place to start. Every listing below works with OpenAI Codex. Free GitHub projects and paid options are ranked together.
Updated October 2026 · 3 listings · stars refreshed daily from GitHub
How to add official skill collections to OpenAI Codex
Skills follow the open Agent Skills format: a folder with a SKILL.md file. Copy the folder into the skills directory your app reads, then restart the session so the new description is picked up.
Anthropic Agent Skills 🧩 SkillFree
Anthropic's official collection of Agent Skills, including document, design and developer skills
Skill Creator 🧩 SkillFree
A skill for writing new skills: structure, descriptions and testing
Agent Skills Specification 🧩 SkillOpen source
The open SKILL.md standard: specification, docs and a reference validator
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