I have a question about API calls. I’m developing an AI Agent product and need to utilize some utility functions. In this scenario, should I use the response_format parameter to format the output as JSON and then determine the parameters to dispatch the utility functions, or would it be more effective to encapsulate the utility functions within the tools parameter for automatic invocation? Could you explain which of these two approaches has more advantages? I’m personally leaning towards using response_format because it allows me to have better algorithmic control and helps prevent errors. 