{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/Message",
  "title": "Message",
  "type": "object",
  "required": [
    "role"
  ],
  "properties": {
    "role": {
      "type": "string",
      "enum": [
        "user",
        "assistant",
        "system",
        "tool"
      ],
      "description": "The role of the message author in the conversation."
    },
    "content": {
      "type": "string",
      "description": "The text content of the message."
    },
    "tool_call_id": {
      "type": "string",
      "description": "The ID of the tool call this message is responding to. Required when role is tool."
    },
    "tool_calls": {
      "type": "array",
      "description": "Tool calls generated by the model. Present when role is assistant and the model decided to call tools.",
      "items": {
        "$ref": "#/components/schemas/ToolCall"
      }
    }
  }
}