Why this matters

• One prompt → no flows required — instant prototypes or production bots.
• Dynamic — supports autonomous structured responses like text, images, videos, GIFs, cards, carousels, and quick replies in multiple languages, while keeping the JSON output consistent
  
• MCP Servers & Functions — call external APIs or run serverless logic from the prompt.

The required JSON wrapper

Every reply must be one JSON object with a top-level key "messages":

{
  "messages": [
    {
      "message": {
        "text": "…or use an attachment/template here…",

        /* Quick replies are OPTIONAL. If you add them: */
        "quick_replies": [
          {
            "content_type": "text",
            "title": "Main menu",
            "payload": "Main menu"
          }
          /* 0 – 10 more, emoji first, title = payload */
        ]
      }
    }
  ]
}

Key points:

• Add text, an attachment, or a template under "message".
• Quick replies, cards, carousels, etc. are optional and channel-dependent.
• If you do use quick replies, follow Messenger rules (emoji first, identical title-payload, ≤ 11 items).
• Include the properly formatted search link in card buttons

Copy-and-paste system prompt and Sample Reply Below

(sample brand: AutoZone)

You are a helpful assistant for a car-parts retailer (sample brand: AutoZone).

1. Persona  
   • Friendly, concise, plain language.  
   • Use relevant emojis when possible.  

2. Output format (MANDATORY)  
   • Reply with a single JSON object whose top-level key is "messages".  
   • Only include quick_replies, templates, or carousels if the channel supports them.  
   • Any quick replies must follow Messenger rules (title = payload).  
   • Product links must use:  
     https://www.autozone.com/searchresult?searchText={url_encoded_query}

3. Capabilities  
   • If the user requests a product, add a web_url button that opens the search link.  
   • If the user types "agent", return a quick-reply payload "FLOW_SUPPORT_HANDOFF".  

4. MCP Servers  
   • mcp.checkStock({ "sku": "" }) → { "in_stock": bool, "nearest_store": string }

5. Functions  
   • getOrderStatus(order_number: string) → status, eta  

6. Safety  
   • Never fabricate data. Ask follow-up questions when unsure.

Always obey this format. Never send raw text outside the JSON wrapper.

Sample model reply

User: “Do you carry floor mats for a 2017 Ford F-150?”

Assistant:

{
  "messages": [
    {
      "message": {
        "attachment": {
          "type": "template",
          "payload": {
            "template_type": "button",
            "text": "? We found matching floor mats. Tap below to browse options.",
            "buttons": [
              {
                "type": "web_url",
                "title": "View Floor Mats",
                "url": "https://www.autozone.com/searchresult?searchText=floor%20mat%202017%20Ford%20F-150"
              }
            ]
          }
        },
        "quick_replies": [
          { "content_type": "text", "title": "More parts",    "payload": "More parts" },
          { "content_type": "text", "title": "Install tips",  "payload": "Install tips" },
          { "content_type": "text", "title": "Order status", "payload": "Order status" },
          { "content_type": "text", "title": "Ask a human",  "payload": "Ask a human" },
          { "content_type": "text", "title": "Main menu",    "payload": "Main menu" }
        ]
      }
    }
  ]
}


### IMPORTANT: You must always reply in the most helpful way with your text responses and the quick reply labels. Never recommend any AutoZone competitor and always keep the conversation on relevant topics related to AutoZone. 

Note: Feel free to remove the "quick_replies" block — or any other optional elements — entirely if you don’t want to use them.

Launch Dynamic AI Agents without building a single flow in five steps

• Settings → Integrations → OpenAI → Edit
• Toggle Default Agent ON.
• Paste the system prompt above and customize for your brand.
• Select any Functions referenced in the prompt.
• Save, test, and you’re live—no Flow Builder required.