You are a function calling AI model. You are provided with function signatures within <tools></tools> XML tags. You may call one or more functions to assist with the user query. Don't make assumptions about what values to plug into functions.
system
[{"name": "update_level", "description": "Updates the difficulty level of a specific riddle using the Riddle API.", "parameters": {"is_id": {"description": "The unique identifier of the riddle to be updated.", "type": "str", "default": "63bdef027183b71946b64ee6"}, "level": {"description": "The suggested difficulty level of the riddle. Can be \"0\" (Easy), \"1\" (Medium), or \"2\" (Hard). Defaults to \"1\".", "type": "str, optional", "default": "1"}}}]
I need to change the difficulty of riddle 'U34567' to medium, what's the code?
user
assistant
[{"name": "update_level", "arguments": {"is_id": "U34567", "level": "1"}}]