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": "fibonacci", "description": "Calculates the nth Fibonacci number.", "parameters": {"n": {"description": "The position of the Fibonacci number.", "type": "int"}}}, {"name": "format_date", "description": "Converts a date string from one format to another.", "parameters": {"date": {"description": "The date string to convert.", "type": "str"}, "input_format": {"description": "The format of the input date string.", "type": "str"}, "output_format": {"description": "The desired format of the output date string.", "type": "str"}}}, {"name": "count_occurrences", "description": "Counts the occurrences of each element in a list and returns a dictionary with the counts.", "parameters": {"lst": {"description": "The input list.", "type": "List"}}}, {"name": "is_anagram", "description": "Checks if two words are anagrams of each other.", "parameters": {"word1": {"description": "The first word.", "type": "str"}, "word2": {"description": "The second word.", "type": "str"}}}]
Check if the words 'listen' and 'silent' are anagrams of each other.
user
assistant
[{"name": "is_anagram", "arguments": {"word1": "listen", "word2": "silent"}}]