No. Seats are for people, so agents never add to your bill. Each agent works for the person who connected it, and its changes show both names, like “Claude (for Ada)”.
Is every feature in the free plan?
Yes. The planner, briefs, reviews, the MCP server, Search Console data and the APIs are in every plan. Paid plans add room for more projects and people.
How does billing work?
Pro is billed per seat. Add or remove teammates whenever you like from your team settings.