feat: Add output schema definitions for notification results and update test cases

Author: PratyushNag

examples/servers/simple-streamablehttp/mcp_simple_streamablehttp/server.py

@@ -117,6 +117,14 @@ async def list_tools() -> list[types.Tool]:
                         },
                     },
                 },
+                outputSchema={
+                    "type": "array",
+                    "items": {
+                        "type": "object",
+                        "description": "TextContent with notification information",
+                    },
+                    "description": "List of text content with notification results",
+                },
             )
         ]
 

src/mcp/client/session_group.py

@@ -154,7 +154,6 @@ async def __aexit__(
             for exit_stack in self._session_exit_stacks.values():
                 tg.start_soon(exit_stack.aclose)
 
-
     @property
     def sessions(self) -> list[mcp.ClientSession]:
         """Returns the list of sessions being managed."""

tests/server/fastmcp/test_tool_manager.py

@@ -49,6 +49,7 @@ class AddArguments(ArgModelBase):
             fn_metadata=fn_metadata,
             is_async=False,
             parameters=AddArguments.model_json_schema(),
+            output_schema={"type": "integer"},
             context_kwarg=None,
             annotations=None,
         )