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Still slightly confused on what MCPs are but looking at this it does look useful

A plugin protocol that allows “applications” to interact with LLMs.

wouldn't it be for LLMs to interact with applications?

Well they do work two ways. Extend an application to access an LLM, and allow an LLM to get context from an application.

For LLMs to interact with applications (without a two way protocol) is achievable just with tools/functions.

A protocol (the P in MCP) for LLMs to use tools.