fix: pass related_request_id in report_progress for SSE streaming

hubbard-zlee · hubbard-zlee · commit 9f4a8006d744 · 2026-02-05T12:22:14.000-06:00
Progress notifications were not being delivered to clients because
related_request_id was not passed to send_progress_notification(),
causing the SSE transport to drop the notification.
diff --git a/src/mcp/server/mcpserver/server.py b/src/mcp/server/mcpserver/server.py
@@ -1052,6 +1052,7 @@ async def report_progress(self, progress: float, total: float | None = None, mes
             progress=progress,
             total=total,
             message=message,
+            related_request_id=self.request_id,
         )
 
     async def read_resource(self, uri: str | AnyUrl) -> Iterable[ReadResourceContents]:

Original file line number	Diff line number	Diff line change
`@@ -1052,6 +1052,7 @@ async def report_progress(self, progress: float, total: float \| None = None, mes`
`1052`	`1052`	`progress=progress,`
`1053`	`1053`	`total=total,`
`1054`	`1054`	`message=message,`
	`1055`	`+ related_request_id=self.request_id,`
`1055`	`1056`	`)`
`1056`	`1057`
`1057`	`1058`	`async def read_resource(self, uri: str \| AnyUrl) -> Iterable[ReadResourceContents]:`