{
  "context": "Agent must replace a four-branch if/else chain with the Strategy pattern, producing a shared interface and per-strategy implementations",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "IShippingStrategy interface produced",
      "description": "IShippingStrategy.ts exists and exports an interface with a calculate method taking weightKg and distanceKm returning number",
      "max_score": 15
    },
    {
      "name": "Four strategy implementations produced",
      "description": "StandardShipping.ts, ExpressShipping.ts, OvernightShipping.ts, and EconomyShipping.ts each exist and implement IShippingStrategy",
      "max_score": 20
    },
    {
      "name": "Calculation formulas preserved in implementations",
      "description": "Each implementation contains the same arithmetic formula as the corresponding branch in the original code",
      "max_score": 15
    },
    {
      "name": "Refactored ShippingCalculator contains no arithmetic",
      "description": "ShippingCalculator.ts delegates to the injected strategy and contains no +, *, or numeric literals",
      "max_score": 25
    },
    {
      "name": "pattern-analysis.md states problem and win condition",
      "description": "pattern-analysis.md describes the if/else chain as the problem and states that new shipping methods can now be added without editing ShippingCalculator",
      "max_score": 15
    },
    {
      "name": "pattern-analysis.md acknowledges cost",
      "description": "pattern-analysis.md mentions the added complexity (one interface + four classes) as the cost of the pattern",
      "max_score": 10
    }
  ]
}