Skills are Markdown instruction files that every agent in your workspace can read.
When you upload a skill, you teach your agents a process, style guide, or piece of domain knowledge. Every agent in the workspace can use every skill automatically — there is no per-agent assignment.
- Open Library › Skills.
- Click Upload files and choose a .md file (or a zip containing a SKILL.md).
- The skill appears in the list and is active immediately.
Where: Library › Skills (web and Mac).
Good to know: attaching a SKILL.md file directly to a chat installs it as a skill for that session only. Skills are not charged; they are stored and delivered as context. Related: Upload a skill, What is the Library?.