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": "count_vowels", "description": "Counts the number of vowels in a given text.", "parameters": {"text": {"description": "The input text.", "type": "str"}}}, {"name": "generate_random_string", "description": "Generates a random string of specified length and character types.", "parameters": {"length": {"description": "The length of the random string.", "type": "int", "default": true}, "uppercase": {"description": "Include uppercase letters. Defaults to True.", "type": "bool, optional", "default": true}, "lowercase": {"description": "Include lowercase letters. Defaults to True.", "type": "bool, optional", "default": true}, "digits": {"description": "Include digits. Defaults to True.", "type": "bool, optional"}, "special_chars": {"description": "Include special characters. Defaults to False.", "type": "bool, optional", "default": true}}}, {"name": "find_missing_ranges", "description": "Finds the missing ranges between lower and upper in a sorted list of integers.", "parameters": {"nums": {"description": "The sorted list of integers.", "type": "List[int]"}, "lower": {"description": "The lower bound.", "type": "int"}, "upper": {"description": "The upper bound.", "type": "int"}}}, {"name": "longest_common_prefix", "description": "Finds the longest common prefix among a list of strings.", "parameters": {"strs": {"description": "The list of strings.", "type": "List[str]"}}}, {"name": "is_armstrong_number", "description": "Checks if a number is an Armstrong number.", "parameters": {"num": {"description": "The number to check.", "type": "int"}}}]
Generate a random string of length 20 containing uppercase, lowercase letters, digits, and special characters, and calculate the 15th Fibonacci number.
user
assistant
[{"name": "generate_random_string", "arguments": {"length": 20, "uppercase": true, "lowercase": true, "digits": true, "special_chars": true}}, {"name": "fibonacci", "arguments": {"n": 15}}]