Why replace it at all? Just remove it. I use AI every day and don't use MCP. I've built LLM powered tools that are used daily and don't use MCP. What is the point of this thing in the first place?

It's just a complex abstraction over a fundamentally trivial concept. The only issue it solves is if you want to bring your own tools to an existing chatbot. But I've not had that problem yet.

There’s nothing special about llm tools. They’re really just script invocations. A command runner like just does everything you need, and makes the tools available to humans.

I wrote a bit on the topic here: https://tombedor.dev/make-it-easy-for-humans/

Dynamic code generation for calling APIs, not sure what is a fancy term for this approach.

You don't need to replace it. Just please stop using it.

If for nothing else than pure human empathy.