It's just a an RPC-like protocol and SDKs that implement it to help LLMs understand what they can do with other systems (eg GitHub, file systems, Obsidian, etc)

It's just a an RPC-like protocol and SDKs that implement it to help LLMs understand what they can do with other systems (eg GitHub, file systems, Obsidian, etc). It uses a client-server architecture where servers implementing MCP expose a set of commands and prompts to interact with a specific system. And clients (LLMs) can interact with the servers it knows about. So MCP makes it easy for LLMs to interact with anything. And there are now hundreds of such servers.