{
  "context": "Tests whether the agent uses wp calculus and backward construction to implement a sequence of assignments that satisfy a specific postcondition.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "Backward construction logic",
      "description": "Evidence (e.g., in comments) of calculating wp(C, Q) backwards from the postcondition.",
      "max_score": 30
    },
    {
      "name": "Assignment rule usage",
      "description": "Correct substitution of expressions into the postcondition logic during derivation.",
      "max_score": 20
    },
    {
      "name": "Correct precondition",
      "description": "The final derived precondition P is documented or asserted at the start.",
      "max_score": 20
    },
    {
      "name": "Sequential composition",
      "description": "Correct chaining of wp(S1, wp(S2, Q)) for multiple statements.",
      "max_score": 20
    },
    {
      "name": "Assertion presence",
      "description": "Includes native assertions (e.g. assert) for the final result.",
      "max_score": 10
    }
  ]
}