{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "product_id": {
      "type": "string",
      "description": "Exact grouped BestPrice product id returned by search_products, in bp_<id> form."
    },
    "period_days": {
      "default": 180,
      "description": "Requested history window in days. Use 180 for the strongest price context unless the user asks otherwise.",
      "anyOf": [
        {
          "type": "number",
          "const": 30
        },
        {
          "type": "number",
          "const": 90
        },
        {
          "type": "number",
          "const": 180
        }
      ]
    }
  },
  "required": [
    "product_id"
  ],
  "additionalProperties": false
}