The development of user interfaces (UI) for artificial intelligence (AI) applications is crucial to improve how machines operate on behalf of users, as it can impact the user experience and trust in AI-driven systems. According to Vectara's four principles - self-identification, explainability, simplicity, and consistency - developers should prioritize providing clear indicators that they are interacting with a machine, ensuring transparency and accessibility of data supporting AI outputs, streamlining interfaces to avoid unnecessary complexity, and maintaining consistent user experiences across different applications and features. By adopting these principles, developers can create more trustworthy and effective UIs for AI applications, ultimately enhancing the user experience and harnessing the full potential of AI technology.