{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "ContentPart",
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "description": "The type of the content part."
    },
    "text": {
      "type": "string",
      "description": "The text content. Required when type is text."
    },
    "image_url": {
      "type": "object",
      "description": "The image URL content. Required when type is image_url."
    }
  }
}