The correct answer is B because gating downstream actions requires a reliable state variable and an action availability rule. A mutable session variable can store whether patient verification has been completed, and available when can prevent scheduling actions from being available until that variable indicates verified status. This is the standard declarative Agent Script pattern for controlled action access. Option A is unnecessarily code-heavy and shifts simple state gating into Apex when Agentforce can manage it with variables and availability rules. Option C only changes descriptive text; it does not enforce whether the scheduling action can be used. In compliance workflows, the control must prevent the action from being callable, not merely tell the model what to do. Salesforce context engineering examples show variables and action filters being used to control action availability.