WinUI 3 and Windows App SDK development agent, instructions, and migration guide. Prevents common UWP API misuse and guides correct WinUI 3 patterns for desktop Windows apps.

Installation

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

What's Included

Commands (Slash Commands)

Command	Description
`/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, compiled bindings, dependency injection
Migration checklist — step-by-step guide for porting UWP apps

Source

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

License

MIT