Update app.py

app.py

@@ -10,7 +10,14 @@ from Gradio_UI import GradioUI
 #Marathon training plan
 @tool
 def fetch_marathon_plan(goal_time: str) -> str:
-    """Fetches a marathon training plan based on a goal time."""
+    """Fetches a marathon training plan based on a goal time.
+    
+    Args:
+        goal_time: Desired marathon completion time (e.g., '4:00', '3:30').
+    
+    Returns:
+        A link to a training plan or summary of key details.
+    """
     search_tool = DuckDuckGoSearchTool()
     query = f"marathon training plan {goal_time} site:runnersworld.com"
     results = search_tool.search(query)