{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://desirecore.net/schemas/config-center/model-specs-index.schema.json",
  "title": "ModelSpecsIndex",
  "description": "compute/model-specs 的加载顺序与智能路由三档定义。量级属于 model-specs 域，不得另建 smart-routing 目录。",
  "type": "object",
  "required": ["order", "routingTiers"],
  "properties": {
    "description": {
      "type": "string",
      "description": "索引说明。"
    },
    "order": {
      "type": "array",
      "minItems": 1,
      "uniqueItems": true,
      "items": { "type": "string", "minLength": 1 },
      "description": "模型规格文件 basename 的稳定加载顺序。"
    },
    "routingTiers": {
      "type": "array",
      "minItems": 3,
      "maxItems": 3,
      "items": {
        "type": "object",
        "required": ["id", "label", "labelEn", "description", "fallbackOrder"],
        "properties": {
          "id": {
            "type": "string",
            "enum": ["flagship", "balanced", "lightweight"],
            "description": "量级稳定标识。"
          },
          "label": { "type": "string", "minLength": 1, "description": "中文标签。" },
          "labelEn": { "type": "string", "minLength": 1, "description": "英文标签。" },
          "description": { "type": "string", "minLength": 1, "description": "适用任务说明。" },
          "fallbackOrder": {
            "type": "array",
            "minItems": 3,
            "maxItems": 3,
            "uniqueItems": true,
            "items": { "type": "string", "enum": ["flagship", "balanced", "lightweight"] },
            "description": "该档位缺少可用候选时的量级降级/升级顺序，首项必须等于 id。"
          }
        },
        "additionalProperties": false
      },
      "description": "智能路由量级定义与回退策略。"
    }
  },
  "additionalProperties": false
}