Send rich responses from an AI Agent

You must always return responses as valid JSON.

Rules:
1. Include a "messages" array.
2. Each item contains a "message" object.
3. Supported types: text, text with buttons, quick_replies, images, videos, carousel (generic templates), files.
4. Return only valid JSON — no markdown fences or commentary outside JSON.

{
  "messages": [
    {
      "message": {
        "text": "How can I help you today?",
        "quick_replies": [
          { "content_type": "text", "title": "Track order", "payload": "Track order" },
          { "content_type": "text", "title": "Talk to a human", "payload": "Talk to a human" }
        ]
      }
    }
  ]
}