Method on_request

src/mcp/server/runner.py:202–211

`_on_request` wrapped in `dispatch_middleware`, outermost-first. Dispatch-tier middleware sees raw `(dctx, method, params) -> dict` and wraps everything - initialize, METHOD_NOT_FOUND, validation failures included.

(self)

    @cached_property
    def on_request(self) -> OnRequest:
        """`_on_request` wrapped in `dispatch_middleware`, outermost-first.

        Dispatch-tier middleware sees raw `(dctx, method, params) -> dict` and
        wraps everything - initialize, METHOD_NOT_FOUND, validation failures
        included.
        """
        return reduce(
            lambda handler, middleware: middleware(handler), reversed(self.dispatch_middleware), self._on_request
        )

    @cached_property
    def on_notify(self) -> OnNotify: