Mcp Sampling Create Message Example

{
  "request": {
    "jsonrpc": "2.0",
    "id": 7,
    "method": "sampling/createMessage",
    "params": {
      "messages": [
        {
          "role": "user",
          "content": {
            "type": "text",
            "text": "Suggest three column names for an orders fact table."
          }
        }
      ],
      "modelPreferences": {
        "intelligencePriority": 0.7,
        "costPriority": 0.2,
        "speedPriority": 0.1
      },
      "systemPrompt": "You are a data engineer assistant.",
      "includeContext": "thisServer",
      "maxTokens": 256
    }
  },
  "response": {
    "jsonrpc": "2.0",
    "id": 7,
    "result": {
      "role": "assistant",
      "content": {
        "type": "text",
        "text": "order_id, ordered_at, customer_id"
      },
      "model": "claude-opus-4-7",
      "stopReason": "endTurn"
    }
  }
}