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": "user_by_rest_id", "description": "Fetches user information from Twitter using a REST API by user ID.", "parameters": {"is_id": {"description": "The user ID to fetch information for.", "type": "str", "default": "44196397"}}}, {"name": "song_download", "description": "Downloads a song from the provided SoundCloud URL using the specified RapidAPI key.", "parameters": {"track_url": {"description": "The URL of the SoundCloud track to be downloaded.", "type": "str", "default": "https://soundcloud.com/user-977421934/the-phoenix"}}}, {"name": "get_9gag", "description": "Checks if a given username is available on 9gag using the RapidAPI service.", "parameters": {"username": {"description": "The username to check for availability on 9gag.", "type": "str", "default": "username"}}}, {"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 user details for Twitter user with ID '1234567890' and check if the username 'exampleUser' is available on 9gag.
user
assistant
[{"name": "user_by_rest_id", "arguments": {"is_id": "1234567890"}}, {"name": "get_9gag", "arguments": {"username": "exampleUser"}}]