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": "merge_dictionaries", "description": "Merges two dictionaries into a single dictionary.", "parameters": {"dict1": {"description": "The first dictionary.", "type": "Dict"}, "dict2": {"description": "The second dictionary.", "type": "Dict"}}}]
Please verify the validity of parentheses in the string '({[()]})'. Additionally, merge {'x': 10, 'y': 20} with {'y': 30, 'z': 40}.
user
assistant
[{"name": "is_valid_parentheses", "arguments": {"s": "({[()]})"}}, {"name": "merge_dictionaries", "arguments": {"dict1": {"x": 10, "y": 20}, "dict2": {"y": 30, "z": 40}}}]