The information radiator is a key tool in Agile that provides a real-time, visual display of the project's current status, including progress, completed tasks, blockers, and upcoming work. This is typically made accessible to all stakeholders and is updated regularly to ensure transparency and communication. Instead of relying on emails or meeting invites, the Scrum Master should direct the customer representative to the information radiator, as it provides the most up-to-date and easily accessible information about the project's progress. This encourages transparency and aligns with Agile principles of open communication and visibility.