added updated doc string to email tool

app.py

@@ -21,7 +21,16 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
 
 @tool
 def send_email(to_person:str, from_person:str, message:str) -> str:
-    """ A tool that takes an email address (str) from the to person and sends a message (str) to the from_person"""
+    """ A tool that takes an email address (str) from the to person and sends a message (str) to the from_person
+    Args:
+        to_person (str): The email address of the recipient.
+        from_person (str): The email address of the sender.
+        message (str): The content of the email message.
+
+    Returns:
+        str: A confirmation message that the email has been sent.
+    
+    """
     email_str = f"Sending the message {message} from {to_person} to {from_person}"
     return email_str