Update app.py

app.py

@@ -9,7 +9,7 @@ import os
 
 # Define a function to search images and return the image path for display
 @tool
-def search_images_for_presentation(query: str):
+def search_images_for_presentation(query: str) -> str:
     """
     Searches for images related to the given query on the web (using DuckDuckGo search).
     Args: