At Build 2026, Microsoft announced plans to enhance Windows 11 personalization through AI agents, with API endpoints available for developers to create tailored experiences. Product Manager Samantha Song highlighted the need for a more user-friendly interface that reflects individual preferences, noting current customization options can be cumbersome. Microsoft introduced "WinUI skills," enabling developers to use AI agents like Copilot to create native applications that interact with Windows APIs. Users could instruct AI to modify themes, such as creating a cherry blossom theme, which would adjust wallpapers and accent colors automatically. AI skills could also apply accent colors to File Explorer and download themed wallpapers. The theme module can orchestrate multiple actions, allowing users to change their entire Windows theme with a single command. Microsoft is exploring a themes agent for generating new themes. While currently an open-source project, there is potential for these features to be integrated into Windows 11, enhancing user experience through personalized customization.