{
  "version": "fak-route/v1",
  "default": { "members": [{ "model": "medium", "role": "primary" }], "reason": "fail-closed mid-tier" },
  "rules": [
    {
      "name": "bad-reduce",
      "match": { "aspect": "query" },
      "plan": {
        "members": [{ "model": "a" }, { "model": "b" }],
        "reduce": "average"
      }
    }
  ]
}