WinUI 3

Purpose

Build modern Windows desktop applications using WinUI 3 with WinAppSDK, Fluent Design, and MSIX packaging for Windows 10/11.

Agent Protocol

Trigger

User request includes: winui3, winui 3, winappsdk, winapp sdk, windows app sdk, fluent design, modern windows app, muxc, microsoft.ui.xaml.

Input Context

• WinAppSDK version (1.4, 1.5, 1.6)
• .NET version (.NET 8+, .NET 9)
• Project type (single-window, multi-window, packaged, unpackaged)
• Deployment target (Windows 10 1809+, Windows 11)
• Template (Blank App, Navigation App, SplitView)