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": "is_valid_parentheses", "description": "Checks if a string contains valid parentheses.", "parameters": {"s": {"description": "The input string.", "type": "str"}}}, {"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": "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"}}}, {"name": "get_range", "description": "Helper function to format the range string.", "parameters": {"start": {"description": "The start of the range.", "type": "int"}, "end": {"description": "The end of the range.", "type": "int"}}}, {"name": "is_rotation", "description": "Checks if one string is a rotation of another string.", "parameters": {"str1": {"description": "The first string.", "type": "str"}, "str2": {"description": "The second string.", "type": "str"}}}, {"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]"}}}]
Generate a range string from 10 to 20.
user
assistant
[{"name": "get_range", "arguments": {"start": 10, "end": 20}}]