Update app.py

app.py

@@ -13,9 +13,10 @@ def my_custom_tool(prompt: str)-> str: #it's import to specify the return type
     """A tool that does helps to generate the image for the given text prompt 
     Args:
         prompt(str): A string that describes about the image to generate
+    Returns:
+        str: A URL to the generated image.
     """
-    return str: A URL to the generated image.
-
+    
 @tool
 def get_current_time_in_timezone(timezone: str) -> str:
     """A tool that fetches the current local time in a specified timezone.