Yes, and I believe this is what the article is referring to when it says “a stochastic black box that communicates through a complex web of JSON schemas attache

Yes, and I believe this is what the article is referring to when it says “a stochastic black box that communicates through a complex web of JSON schemas attached to docstring annotations”. Specifically, in the function definition: @mcp.tool() def factor(a: int) -> int: """Factor an integer""" return factor_number(a) the decorator `@mcp.tool()` does something behind the scenes to set up the right thing using the docstring of the function. The documentation and source code seem to be: - (official SDK): https://github.com/modelcontextprotocol/python-sdk/blob/e80c0150e1c2e45f66195d3cf7d209be31ce6e5d/src/mcp/server/fastmcp/server.py#L344 https://github.com/modelcontextprotocol/python-sdk/blob/e80c... -> using the function's docstring: https://github.com/modelcontextprotocol/python-sdk/blob/e80c0150e1c2e45f66195d3cf7d209be31ce6e5d/src/mcp/server/fastmcp/tools/base.py#L55 https://github.com/modelcontextprotocol/python-sdk/blob/e80c... - (v2?): https://gofastmcp.com/servers/tools#the-%40tool-decorator https://gofastmcp.com/servers/tools#the-%40tool-decorator and https://github.com/jlowin/fastmcp/blob/998de22a6e76fc8ae323e829c38143c910ff57db/src/fastmcp/server/server.py#L485 https://github.com/jlowin/fastmcp/blob/998de22a6e76fc8ae323e... -> using the function's docstring: https://github.com/jlowin/fastmcp/blob/998de22a6e76fc8ae323e829c38143c910ff57db/src/fastmcp/tools/tool.py#L77 https://github.com/jlowin/fastmcp/blob/998de22a6e76fc8ae323e...