Building an Advanced Netflix MCP: Server Implementation Guide
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Debugging Middleware
Middleware in FastMCP is code that runs around every request, letting you observe or modify behaviour without changing the tools themselves.
Here we define a simple piece of middleware that prints tool calls to the terminal when the DEBUG environment variable is set to true.
class DebugToolMiddleware(Middleware):
"""Print tool calls when DEBUG=true environment variable is set."""
async def on_call_tool(self, context: MiddlewareContext, call_next):
"""Intercept tool calls and log them before execution."""
if os.getenv("DEBUG", "false").lower() == "true":
tool_name = contextPractical MCP with FastMCP & LangChain
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