1---2name: winui-app3description: Bootstrap, develop, and design modern WinUI 3 desktop applications with C# and the Windows App SDK using official Microsoft guidance, WinUI Gallery patterns, Windows App SDK samples, and CommunityToolkit components. Use when creating a brand new app, preparing a machine for WinUI, reviewing, refactoring, planning, troubleshooting, environment-checking, or setting up WinUI 3 XAML, controls, navigation, windowing, theming, accessibility, responsiveness, performance, deployment, or related Windows app design and development work.4---56# winui-app78## Intent9- Bootstrap, develop, and design modern WinUI 3 desktop applications with C# and the Windows App SDK using official Microsoft guidance, WinUI Gallery patterns, Windows App SDK samples, and CommunityToolkit components. Use when creating a brand new app, preparing a machine for WinUI, reviewing, refactoring, planning, troubleshooting, environment-checking, or setting up WinUI 3 XAML, controls, navigation, windowing, theming, accessibility, responsiveness, performance, deployment, or related Windows app design and development work.1011## Default operating pattern121. Identify the target platform, form factor, and native system constraints.132. Choose native patterns before inventing custom behavior.143. Translate platform rules into implementable UI, architecture, or code guidance.154. Check accessibility, ergonomics, lifecycle, and integration edges.165. Return a concrete implementation path instead of vague platform advice.1718## Pack fit19- Included in: `platform-apps`20- Keep examples generic, privacy-safe, and portable across hosts.2122## Boundary23- Do not use for macOS, web-only, or mobile-only interface questions.
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