progress_token is 0 on first tool-call and the return is taken mistakenly

sheffler · sheffler · commit 76325b7846d6 · 2025-01-27T19:04:20.000-08:00
diff --git a/src/mcp/server/fastmcp/server.py b/src/mcp/server/fastmcp/server.py
@@ -599,7 +599,7 @@ async def report_progress(
             else None
         )
 
-        if not progress_token:
+        if progress_token == None:
             return
 
         await self.request_context.session.send_progress_notification(

Original file line number	Diff line number	Diff line change
`@@ -599,7 +599,7 @@ async def report_progress(`
`599`	`599`	`else None`
`600`	`600`	`)`
`601`	`601`
`602`		`- if not progress_token:`
	`602`	`+ if progress_token == None:`
`603`	`603`	`return`
`604`	`604`
`605`	`605`	`await self.request_context.session.send_progress_notification(`