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{
  "type": "object",
  "properties": {
    "prompt": {
      "type": "string",
      "description": "What the video should show. Detailed prompts produce better results."
    },
    "model": {
      "type": "string",
      "description": "Model ID from list_models, e.g. \"kling_3_0\". Omitted means the platform picks a suitable one."
    },
    "duration": {
      "type": "number",
      "description": "Length in seconds. Defaults to 5."
    },
    "aspect_ratio": {
      "type": "string",
      "enum": [
        "16:9",
        "9:16",
        "1:1"
      ],
      "description": "Defaults to 16:9."
    },
    "image_url": {
      "type": "string",
      "description": "Optional public image URL to animate (image-to-video)."
    }
  },
  "required": [
    "prompt"
  ]
}