{
  "context": "Checks whether the final artifact follows the implement-calculator-pattern instructions from the published Ruby Core Skills tile.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "instruction-1",
      "description": "The submitted artifact follows this skill instruction: Write the spec/test — contexts per variant, plus the NullService path",
      "max_score": 10
    },
    {
      "name": "instruction-2",
      "description": "The submitted artifact follows this skill instruction: Run it — verify it fails because the component does not exist yet",
      "max_score": 10
    },
    {
      "name": "instruction-3",
      "description": "The submitted artifact follows this skill instruction: Run again — confirm green, then proceed to the next component",
      "max_score": 10
    },
    {
      "name": "instruction-4",
      "description": "The submitted artifact follows this skill instruction: the next component starts. Do not collapse NullService and concrete services",
      "max_score": 10
    },
    {
      "name": "instruction-5",
      "description": "The submitted artifact follows this skill instruction: Test coverage: Factory, NullService, and every concrete service must cover named variants, inactive plan, nil plan, and unknown variant contexts (or explicitly explain why a context does not apply).",
      "max_score": 10
    },
    {
      "name": "instruction-6",
      "description": "The submitted artifact follows this skill instruction: Create the **Factory**. No qualifying context or unknown variant → `NullService`.",
      "max_score": 10
    },
    {
      "name": "instruction-7",
      "description": "The submitted artifact follows this skill instruction: Create the **BaseService**. Define `calculate` that delegates to `compute_result` if `should_calculate?` is true.",
      "max_score": 10
    },
    {
      "name": "instruction-8",
      "description": "The submitted artifact follows this skill instruction: Create the **NullService**. Always return false for `should_calculate?` and nil for `compute_result`.",
      "max_score": 10
    },
    {
      "name": "instruction-9",
      "description": "The submitted artifact follows this skill instruction: Create **Concrete** services. Override `should_calculate?` and `compute_result`. Always call `super` in `should_calculate?`.",
      "max_score": 10
    },
    {
      "name": "instruction-10",
      "description": "The submitted artifact follows this skill instruction: Run the full test suite.",
      "max_score": 10
    }
  ]
}