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": "artist_singles", "description": "Fetches the singles of an artist from the Spotify API.", "parameters": {"is_id": {"description": "The ID of the artist whose singles are to be fetched.", "type": "str", "default": "2w9zwq3AktTeYYMuhMjju8"}, "offset": {"description": "The index of the first single to return. Defaults to '0'.", "type": "str, optional", "default": "0"}, "limit": {"description": "The maximum number of singles to return. Defaults to '20'.", "type": "str, optional", "default": "20"}}}]
Retrieve the next 20 singles of the artist with ID '6eUKZXaKkcviH0Ku9w2n3V', starting from the 20th single.
user
assistant
[{"name": "artist_singles", "arguments": {"is_id": "6eUKZXaKkcviH0Ku9w2n3V", "offset": "20"}}]