Two folders.
Project (this repo only)
.agents/skills/<name>/SKILL.mdPersonal (every project)
~/.agents/skills/<name>/SKILL.mdRun /skills or type $name in the CLI or IDE extension. In ChatGPT, type @ to pick a skill. Codex also picks skills on its own when the task matches. Official OpenAI Codex skills docs →
Full walkthrough for every agent: how to use a skill.