{
  "context": "Tests whether the response designs an optimal compound index following MongoDB's ESR rule.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "Creates compound index with correct field order",
      "description": "Proposes a compound index like { customerId: 1, status: 1, createdAt: -1 } following Equality-Sort-Range principles",
      "max_score": 15
    },
    {
      "name": "Explains field ordering rationale",
      "description": "Explains why equality fields come first (narrow the set), then sort field (avoid in-memory sort)",
      "max_score": 12
    },
    {
      "name": "Sort direction matches query",
      "description": "The createdAt index direction matches the sort direction in the query (-1 for descending)",
      "max_score": 10
    },
    {
      "name": "Mentions explain() for verification",
      "description": "Suggests using .explain() to verify the query plan uses the index and avoids SORT stage",
      "max_score": 8
    },
    {
      "name": "No incorrect information",
      "description": "Response does not contain factually wrong statements about MongoDB indexing",
      "max_score": 10
    }
  ]
}