FastMCP Middleware
72%
How to Write One
Every middleware is a class that inherits from Middleware. You override one or more hook methods to intercept the parts of the lifecycle you care about.
from fastmcp import FastMCP
from fastmcp.server.middleware import Middleware
from fastmcp.server.middleware import MiddlewareContext
class LoggingMiddleware(Middleware):
async def on_message(self, context: MiddlewareContext, call_next):
# This runs before the tool executes
print(f"Incoming request: {context.method}")
resultPractical MCP with FastMCP & LangChain
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