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* WinUI agent * Improvements * Fixes * Add WinUI 3 unit testing guidance across agent, instructions, and skill - Expanded Testing section in agent with Unit Test App project setup, [TestMethod] vs [UITestMethod] attributes, and code examples - Added Testing rules to instructions file - Added Testing Migration section to migration guide skill with UWP-to-WinUI 3 test project mapping and updated checklist Reference: https://learn.microsoft.com/en-us/windows/apps/winui/winui3/testing/create-winui-unit-test-project Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Update agents/winui3-expert.agent.md Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Copilot tweaks * Update agents/winui3-expert.agent.md Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Update agents/winui3-expert.agent.md Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
WinUI 3 Development Plugin
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