Update app.py

add import requests to get_web_search_results to see if enables Agent to use it

app.py

@@ -25,6 +25,7 @@ def get_web_search_results(query: str)-> str: #it's import to specify the return
     Args:
         query: A string representing a valid web query. IMPORTANT: Follow type str format strictly e.g. 'pictures of cats'.
     """
+    import requests
     search_results_tool = DuckDuckGoSearchTool()
     try:
         results = search_results_tool(query)