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": "comments", "description": "Retrieves comments for a specified YouTube video using the YouTube V3 API.", "parameters": {"is_id": {"description": "The ID of the YouTube video for which to retrieve comments.", "type": "str", "default": "1gxf6flnvNA"}, "x_cachebypass": {"description": "Cache bypass flag; value should be '1' to bypass cache. Defaults to None.", "type": "str, optional", "default": ""}, "sort_by": {"description": "The sorting order of comments. Available options are 'newest' or 'top' (default is 'top'). Defaults to None.", "type": "str, optional", "default": ""}, "token": {"description": "The pagination token for retrieving next set of comments. Defaults to None.", "type": "str, optional", "default": ""}}}]
Retrieve the newest comments without caching for the video 'abcdefg'.
user
assistant
[{"name": "comments", "arguments": {"is_id": "abcdefg", "x_cachebypass": "1", "sort_by": "newest"}}]