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": "find_longest_word", "description": "Finds the longest word in a list of words.", "parameters": {"words": {"description": "A list of words.", "type": "List[str]"}}}, {"name": "find_files", "description": "Finds all files with a specific extension in a directory and its subdirectories.", "parameters": {"directory": {"description": "The directory to search in.", "type": "str"}, "extension": {"description": "The file extension to search for.", "type": "str"}}}, {"name": "is_valid_parentheses", "description": "Checks if a string contains valid parentheses.", "parameters": {"s": {"description": "The input string.", "type": "str"}}}]
Find all .py files in the directory '/user/code' and check if the parentheses are valid in the string '{(hello)[world]}'.
user
assistant
[{"name": "find_files", "arguments": {"directory": "/user/code", "extension": ".py"}}, {"name": "is_valid_parentheses", "arguments": {"s": "{(hello)[world]}"}}]