(pedantry)it's something humans are talking about a lot, so up-to-date models do know about it...

Most likely! It's hard to qualify which specific models and version I'm talking about because they're constantly being updated.

But the point is that function & tool calling was already built in. If you take a model from before "MCP" was even referenced on the web it will still _PERFECTLY_ interact with not only other MCP servers and clients but any other API as well.