strong types

app.py

@@ -37,7 +37,7 @@ def get_current_time_in_timezone(timezone: str) -> str:
         return f"Error fetching time for timezone '{timezone}': {str(e)}"
 
 @tool
-def to_leet_speak(text):
+def to_leet_speak(text: str) -> str:
     """
     Converts a string to l33t speak using a substitution table.