ToolFunctionConfig

{
    "name": "lookup_customer",
    "description": "Look up customer information by phone number or email",
    "url": "https://api.example.com/webhook/customers",
    "parameters": {
        "type": "object",
        "properties": {
            "property1": {},
            "property2": {}
        },
        "required": [
            "string"
        ]
    },
    "async": false,
    "asyncResponse": "I've noted that for follow-up."
}