addressing review comments

Author: iupadhyay

src/mcp/client/session.py

@@ -271,9 +271,9 @@ async def call_tool(
         self,
         name: str,
         arguments: dict[str, Any] | None = None,
-        meta: dict[str, Any] | None = None,
         read_timeout_seconds: timedelta | None = None,
         progress_callback: ProgressFnT | None = None,
+        meta: dict[str, Any] | None = None,
     ) -> types.CallToolResult:
         """Send a tools/call request with optional progress callback support."""
         request_meta = None
@@ -286,7 +286,7 @@ async def call_tool(
                     params=types.CallToolRequestParams(
                         name=name,
                         arguments=arguments,
-                        **({"_meta": request_meta} if request_meta else {}),
+                        _meta=request_meta,
                     ),
                 )
             ),

src/mcp/server/fastmcp/server.py

@@ -1175,12 +1175,20 @@ def request_id(self) -> str:
 
     @property
     def request_meta(self) -> dict[str, Any]:
-        """Get the request metadata (hidden data passed from client)."""
+        """Get the request metadata (hidden data passed from client).
+
+        This contains metadata that was sent with the request but is not visible
+        to the LLM. Includes all metadata fields including progressToken.
+        Useful for authentication tokens, user context, session data, etc.
+
+        Returns:
+            Dictionary containing the complete request metadata, or empty dict if none provided.
+        """
         if not self.request_context.meta:
             return {}
 
-        meta_dict = self.request_context.meta.model_dump(exclude={"progressToken"})
-        return meta_dict
+        # Return all metadata fields, including progressToken
+        return self.request_context.meta.model_dump()
 
     @property
     def session(self):