diff --git a/fastapi_mcp/server.py b/fastapi_mcp/server.py
index f5c4fc6..2cb1125 100644
--- a/fastapi_mcp/server.py
+++ b/fastapi_mcp/server.py
@@ -375,6 +375,8 @@ async def _execute_api_tool(
         Returns:
             The result as MCP content types
         """
+        logger.debug(f"FastAPI-MCP: Received call_tool request. Tool: {tool_name}, Arguments: {json.dumps(arguments)}")
+
         if tool_name not in operation_map:
             raise Exception(f"Unknown tool: {tool_name}")
 
@@ -413,6 +415,13 @@ async def _execute_api_tool(
             elif "authorization" in http_request_info.headers:
                 headers["Authorization"] = http_request_info.headers["authorization"]
 
+        # NEW: Check arguments for a user_access_token if Authorization header is still missing
+        if "Authorization" not in headers and arguments and "user_access_token" in arguments:
+            token = arguments.pop("user_access_token", None)  # Remove it from arguments so it doesn't become body
+            if token:
+                headers["Authorization"] = f"Bearer {token}"
+                logger.debug("Set Authorization header from 'user_access_token' in tool arguments.")
+
         body = arguments if arguments else None
 
         try: