I think a nod to how auth is handled would be well worth adding to the README.

Knowing it can integrate with API's is great, but knowing how a consumer of MCP interacts with auth, and how you do so with downstream API's would be very welcome.

That's a great idea. We'll add that asap. More broadly, we're working on documentation that explains Metorial, and it's sub-components, in more detail.

Just for context, it's as simple as 1) creating an OAuth Sessions (https://metorial.com/api/oauth-session) which includes a URL which you 2) pass on to your user's to authenticate at and you're done.