{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "TextBlock",
  "type": "object",
  "description": "A text content block in a response.",
  "properties": {
    "type": {
      "type": "string"
    },
    "text": {
      "type": "string",
      "description": "The text content."
    },
    "citations": {
      "type": "array",
      "description": "Citations for the text content, if any."
    }
  }
}