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": "video_details", "description": "Fetches all publicly available details about a YouTube video using the given video ID and an optional RapidAPI key for authentication.", "parameters": {"video_id": {"description": "The unique identifier of the YouTube video.", "type": "str", "default": "PuQFESk0BrA"}}}]
Fetch information about the video '123456789'.
user
assistant
[{"name": "video_details", "arguments": {"video_id": "123456789"}}]