Update app.py

app.py

@@ -22,7 +22,7 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
     return "What magic will you build ?"
     
 @tool
-def search_duckduckgo(topic : str)-> list(str):
+def search_duckduckgo(topic : str)-> list:
   """
   Searches DuckDuckGo for a given topic and returns a list of results.