Function EvaluatePrecondition

EvaluatePrecondition(
    pre: StepPrecondition,
    observed: {
        targetChecked: boolean;
        targetVisible: boolean;
        url?: string;
        urlMatched: boolean;
    },
): GuardResult
Pure precondition decision from observed facts. Fail-fast: a declared URL pattern that doesn't match, or a required target that never became visible within the bound, FAILS the step (the engine then heals or diverges).
Parameters
- pre: StepPrecondition
- observed: {
      targetChecked: boolean;
      targetVisible: boolean;
      url?: string;
      urlMatched: boolean;
  }
Returns GuardResult
- Defined in packages/AI/ComputerUse/src/engine/replay.ts:165