{
  "context": "Checks whether the final artifact follows the model-domain instructions from the published Ruby Core Skills tile.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "instruction-1",
      "description": "The submitted artifact follows this skill instruction: **Identify invariants:** Ask: what must always be true after any state change? What breaks if two callers mutate the same state simultaneously? Decide which object or boundary must keep each rule true.",
      "max_score": 17
    },
    {
      "name": "instruction-2",
      "description": "The submitted artifact follows this skill instruction: **Choose the aggregate entry point:** Name the object that guards state transitions and consistency. Ask: is there exactly one place a caller must go to change this state?",
      "max_score": 17
    },
    {
      "name": "instruction-3",
      "description": "The submitted artifact follows this skill instruction: **Verify with tests:** Hand off to `test-planning-process` and `tdd-process` before implementation.",
      "max_score": 17
    },
    {
      "name": "instruction-4",
      "description": "The submitted artifact follows this skill instruction: **Invariant or ownership reason** — the rule that must stay true and the exact object responsible for enforcing it",
      "max_score": 17
    },
    {
      "name": "instruction-5",
      "description": "The submitted artifact follows this skill instruction: **Invariant:** An Order must never transition from `cancelled` back to `active`, and its total must always reflect current line items. `Order` is the single entry point; no external caller may mutate line items or status directly.",
      "max_score": 16
    },
    {
      "name": "instruction-6",
      "description": "The submitted artifact follows this skill instruction: **Avoid:** Do not extract an `OrderService` just to hold `place` and `cancel` — that behavior belongs on the aggregate. Do not introduce `OrderRepository` unless a non-standard database persistence backend is required.",
      "max_score": 16
    }
  ]
}