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": "validate_a_token", "description": "Validates a token or a link ID to check if it is valid.", "parameters": {"is_id": {"description": "The identifier for either a token or a link.", "type": "str", "default": ""}, "t": {"description": "The actual token or link to validate.", "type": "str", "default": "link"}}}]
Check the validity of the token 'lmnopqr' with identifier '456' and the link ID 'stuvwx' with identifier '789'.
user
assistant
[{"name": "validate_a_token", "arguments": {"is_id": "456", "t": "lmnopqr"}}, {"name": "validate_a_token", "arguments": {"is_id": "789", "t": "stuvwx"}}]