instructions is an optional param on the InitializeResult that allows users to provide an overarching description of the server and instructions to the LLM for how to use it.

https://modelcontextprotocol.io/specification/2025-06-18/schema#initializeresult

It's possible to use this in the constructor on McpServer:

But this isn't called out in our SDK docs anywhere, making it easy to miss this capability. I've seen the need to "bundle" tools or "tell a server how to use tools in order" multiple times - maybe this should have an example + clearer docs.

The python-sdk mentions it in the readme at least tangentially, though it could be improved: https://github.com/modelcontextprotocol/python-sdk?tab=readme-ov-file#fastmcp-properties