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_username_by_user_id", "description": "Fetches the Instagram username associated with a given user ID using the specified RapidAPI key.", "parameters": {"is_id": {"description": "The Instagram user ID.", "type": "int", "default": "18527"}}}]
What are the Instagram usernames associated with the user IDs 987654, 321123, and 456789?
user
assistant
[{"name": "get_username_by_user_id", "arguments": {"is_id": 987654}}, {"name": "get_username_by_user_id", "arguments": {"is_id": 321123}}, {"name": "get_username_by_user_id", "arguments": {"is_id": 456789}}]