awesome-copilot/plugins/winui3-development

WinUI 3 Development Plugin

End-to-end WinUI 3 and Windows App SDK toolkit: expert agent, coding instructions, UWP-to-WinUI 3 migration guide, MVVM Toolkit reference, plus CLIs for packaging/debugging (winapp) and Microsoft Store publishing (msstore). Covers the full write → package → publish lifecycle for desktop Windows apps and prevents common UWP API misuse.

Installation

# Using Copilot CLI
copilot plugin install winui3-development@awesome-copilot

What's Included

Commands (Slash Commands)

Command	Description
/winui3-development:msstore-cli	Microsoft Store Developer CLI for publishing Windows apps to the Microsoft Store — credentials, app/submission management, package flights, CI/CD publishing
/winui3-development:mvvm-toolkit	CommunityToolkit.Mvvm core: source generators ([ObservableProperty], [RelayCommand]), base classes, validation, and pitfalls
/winui3-development:mvvm-toolkit-di	Wire MVVM Toolkit ViewModels into Microsoft.Extensions.DependencyInjection — Generic Host, lifetimes, constructor injection, testing
/winui3-development:mvvm-toolkit-messenger	MVVM Toolkit Messenger pub/sub — WeakReferenceMessenger, IRecipient<T>, RequestMessage<T>, channels, lifecycle
/winui3-development:winapp-cli	Windows App Development CLI for building, MSIX packaging, debugging-as-packaged, manifests, certificates, signing, and UI automation
/winui3-development:winui3-migration-guide	UWP-to-WinUI 3 migration reference with API mappings and before/after code snippets

Agents

Agent	Description
winui3-expert	Expert agent for WinUI 3 and Windows App SDK development. Prevents common UWP-to-WinUI 3 API mistakes, guides XAML controls, MVVM patterns, windowing, threading, app lifecycle, dialogs, and deployment.

Key Features

• UWP→WinUI 3 API migration rules — prevents the most common code generation mistakes
• Threading guidance — DispatcherQueue instead of CoreDispatcher
• Windowing patterns — AppWindow instead of CoreWindow/ApplicationView
• Dialog/Picker patterns — ContentDialog with XamlRoot, pickers with window handle interop
• MVVM best practices — CommunityToolkit.Mvvm source generators, compiled bindings, dependency injection
• Migration checklist — step-by-step guide for porting UWP apps
• MSIX packaging & debugging — winapp CLI for build, run-as-packaged, manifest, cert, and sign workflows
• Store publishing — msstore CLI for credentials, submissions, flights, and CI/CD publishing pipelines

Source

This plugin is part of Awesome Copilot, a community-driven collection of GitHub Copilot extensions.

License

MIT