def send_request(client, model, max_tokens, messages, output_config=None):
    if output_config is None:
        # Set a default output_config or raise an error
        output_config = {
            "format": {
                "type": "json_schema",
                "schema": {
                    "type": "object",
                    "properties": {
                        "name": {"type": "string"},
                        "email": {"type": "string"},
                        "plan_interest": {"type": "string"},
                        "demo_requested": {"type": "boolean"},
                    },
                    "required": ["name", "email", "plan_interest", "demo_requested"],
                    "additionalProperties": False,
                },
            }
        }
        # Alternatively, you can raise an error
        # raise ValueError("output_config is required")

    response = client.messages.create(
        model=model,
        max_tokens=max_tokens,
        messages=messages,
        output_config=output_config,
    )
    return response

# Example usage:
client =...  # Initialize the client
model = "claude-opus-4.6"
max_tokens = 1024
messages = [
    {
        "role": "user",
        "content": "Extract the key information from this email: John Smith ([email protected]) is interested in our Enterprise plan and wants to schedule a demo for next Tuesday at 2pm.",
    }
]

response = send_request(client, model, max_tokens, messages)
print(response.content[0].text)