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{
  "type": "object",
  "properties": {
    "card_ids": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "minItems": 2,
      "description": "Two or more card ids from your hand, in play order."
    },
    "top_card_id": {
      "type": "string",
      "description": "The last card of the chain (its effect color/type resolves)."
    },
    "color": {
      "type": "string",
      "enum": [
        "red",
        "blue",
        "green",
        "yellow"
      ],
      "description": "Required when the chain top is a wild card (not wildColorRoulette)."
    },
    "use_dragon": {
      "type": "boolean",
      "description": "Dragon skill for 4+ number chains: draw to 24 and keep the turn."
    }
  },
  "required": [
    "card_ids",
    "top_card_id"
  ]
}