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{
  "type": "object",
  "properties": {
    "num1": {
      "type": "number",
      "description": "第一个数字"
    },
    "num2": {
      "type": "number",
      "description": "第二个数字"
    },
    "operation": {
      "type": "string",
      "description": "运算类型：add(加), subtract(减), multiply(乘), divide(除)",
      "enum": [
        "add",
        "subtract",
        "multiply",
        "divide"
      ]
    }
  },
  "required": [
    "num1",
    "num2",
    "operation"
  ],
  "additionalProperties": false
}