Message

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Message",
  "type": "object",
  "description": "A message response from Claude.",
  "properties": {
    "id": {
      "type": "string",
      "description": "Unique object identifier for the message."
    },
    "type": {
      "type": "string",
      "description": "Object type. Always \"message\" for message responses."
    },
    "role": {
      "type": "string",
      "description": "Conversational role of the generated message. Always \"assistant\"."
    },
    "content": {
      "type": "array",
      "description": "Content generated by the model. Array of content blocks, each of which has a type that determines its shape."
    },
    "model": {
      "type": "string",
      "description": "The model that handled the request."
    },
    "stop_reason": {
      "type": "string",
      "description": "The reason the model stopped generating tokens."
    },
    "stop_sequence": {
      "type": "string",
      "description": "The stop sequence that caused the model to stop, if applicable. Null if the model stopped for another reason."
    }
  }
}