Update app.py

app.py

@@ -46,13 +46,16 @@ def generate_surfer_image(next_tide: str) -> str:
 
 
 @tool
-def display_image_tool(image):
+def display_image_tool(image: Union[Image.Image, str]) -> None:
     """
     A tool that displays an image correctly in different formats.
 
     Args:
-        image: Can be a PIL image, a URL (string), or a Base64-encoded image.
-    
+        image (Union[PIL.Image.Image, str]): 
+            - A PIL Image object
+            - A URL string (starting with "http")
+            - A Base64-encoded image string (starting with "data:image")
+
     Returns:
         None. Displays the image in the notebook or script.
     """