Describe an agent, get an agent
An agent is a job description you keep. Instead of typing the same three paragraphs every Monday, write it down once and call it by name after that.
Make one
Press ⌘K, then New agent, and describe it in plain words:
You read invoices and pull out vendor, date, amount and due date. You always ask before writing a file. If a number is unclear, leave it blank and tell me.

It asks you back about anything it needs to pin down, then writes itself out and lands on your shelf, ready to pick in the who runs it row of any new session.

Skills
A skill is smaller. It is one thing, done a set way: how you like a summary written, the format your quotes take. Nami makes a skill available to every agent you run, not just the one that made it.
Agents and skills both live in your folder, in .claude.
Something missing here? Tell us on GitHub.