Update app.py

app.py

@@ -17,6 +17,14 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
     """
     return "What magic will you build ?"
 
+@tool
+def tell a joke(arg1:str)-> str: #it's import to specify the return type
+    """A tool that creates a joke about a specific topic 
+    Args:
+        arg1: the topic
+    """
+    return "Why did the giraffe think this topic was funny: " + arg1
+
 @tool
 def get_current_time_in_timezone(timezone: str) -> str:
     """A tool that fetches the current local time in a specified timezone.