Santiago splits failing refund agent into three isolated agents

Santiago (@svpino) says a single-agent refund system issued a refund a customer had declined, after a warehouse note told it to refund.

He says he fixed the failure by splitting the work into three agents: Intake, Order Checker, and Refund Processor. In his description, the Intake agent has no access to payment tools, so no agent both reads the customer request and moves money. He also says agents cannot pass notes, instructions, or actions to one another.