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": "get_extra_character_details", "description": "Fetch additional details about a character using the provided character ID and RapidAPI key.", "parameters": {"is_id": {"description": "The unique identifier of the character for which details are being fetched.", "type": "str", "default": ""}}}, {"name": "downloadoptimize", "description": "Downloads the specified OptiFine version using the provided RapidAPI key.", "parameters": {"optifineversion": {"description": "The version of OptiFine to be downloaded.", "type": "str", "default": ""}}}]
Fetch additional details for character ID 'CHAR123'.
user
assistant
[{"name": "get_extra_character_details", "arguments": {"is_id": "CHAR123"}}]