A concise, no-nonsense list of every endpoint your service offers, with a simple text description and a JSON schema, is all that many developers ever wanted and needed in a lot of cases, but no one bothered producing them until we invented a machine that could automatically make use of them.

That’s not true at all, open API have it

Oh like OpenAPI? Or god-forbid, HATEOAS?

MCP itself still runs on JSON RPC, which I think has been a thing since like a long time