Designing for User Agents: The Rise of the UAI

This article discusses the importance of designing for three distinct interfaces when building applications: User Interface (UI), Application Programming Interface (API), and User Agent Interface (UAI). With the rise of AI agents, the UAI becomes crucial. To ensure consistent functionality across all three, the author stresses the need to separate core business logic from interface-specific presentation and interaction patterns. Features should be defined in the underlying application logic and exposed through the interfaces, preventing unintentional degradation of any interface when adding new features.