It seems way too soon to really narrow down any kind of trends after a few months. Most people aren't breathlessly following the next twitter trend, give it at least a year. Nobody is really going to be left behind if they pick up agents now instead of 3 months ago.
The LLM agent can make sense of the text document, figure out the actual tool calls and use them.
And you, the MCP server operator, can change the "API" at any time and the client (LLM agent) will just automatically adjust.