Uno Platform

What it does

When your agent uses it

• : building cross-platform apps from a single C and XAML codebase
• Targeting WebAssembly
• Windows simultaneously
• : unrelated stacks

Example prompts

• “/uno-platform”

Requirements

• Compatibility (from SKILL.md): Requires Uno Platform SDK and workloads for target platforms.

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Choose the right template — Uno Platform offers various templates for different scenarios
2. 2Understand rendering modes — Skia vs native rendering affects performance and fidelity
3. 3Apply MVVM or MVUX patterns — keep views dumb, logic in ViewModels
4. 4Handle platform differences — use conditional XAML or partial classes
5. 5Test on all target platforms — behavior varies across platforms

What it can do on your machine

Read from SKILL.md and the folder at commit 535dd55. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are csharp and xml).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Hosts in commands or code, which the agent is likely to contact:

  • uno.ui
  • schemas.microsoft.com

  Also links to:

  • platform.uno

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

• Compatibility

  Requires Uno Platform SDK and workloads for target platforms.

  From compatibility in the SKILL.md frontmatter.

Context cost

Uno Platform loads about 2k tokens when it runs, and up to ~4.6k if it reads all its reference files. Until then it costs about 143 tokens; SKILL.md has 348 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~143

When it runs · the whole SKILL.md, loaded when a task matches

~2k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~4.6k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from managedcode/dotnet-skills at commit 535dd55, republished under its MIT licence (© managedcode). 348 words, ~1,965 tokens.

name

uno-platform

description

Build cross-platform .NET applications with Uno Platform targeting WebAssembly, iOS, Android, macOS, Linux, and Windows from a single XAML/C# codebase. USE FOR: building cross-platform apps from a single C# and XAML codebase; targeting WebAssembly, iOS, Android, macOS, Linux, and Windows simultaneously; migrating WPF or UWP. DO NOT USE FOR: unrelated stacks; generic tasks that do not need this specific guidance. INVOKES: inspect the repository context, edit targeted files, and run relevant build, test, lint, or validation commands when changes are made.

compatibility

Requires Uno Platform SDK and workloads for target platforms.

MyApp/
├── MyApp/                    # Shared code
│   ├── App.xaml              # Application entry
│   ├── MainPage.xaml         # Main page
│   ├── Presentation/         # ViewModels (MVUX/MVVM)
│   ├── Business/             # Business logic
│   └── Services/             # Platform services
├── MyApp.Wasm/               # WebAssembly head
├── MyApp.Mobile/             # iOS and Android head
├── MyApp.Skia.Gtk/           # Linux head
├── MyApp.Skia.WPF/           # Windows Skia head
└── MyApp.Windows/            # Native WinUI head

public partial record MainModel
{
    public IListFeed<TodoItem> Items => ListFeed.Async(LoadItems);

    private async ValueTask<IImmutableList<TodoItem>> LoadItems(CancellationToken ct)
    {
        var items = await _todoService.GetAllAsync(ct);
        return items.ToImmutableList();
    }
}

<Page xmlns:uen="using:Uno.Extensions.Navigation.UI">
    <utu:FeedView Source="{Binding Items}">
        <utu:FeedView.ValueTemplate>
            <DataTemplate>
                <ListView ItemsSource="{Binding}">
                    <ListView.ItemTemplate>
                        <DataTemplate x:DataType="local:TodoItem">
                            <TextBlock Text="{Binding Title}" />
                        </DataTemplate>
                    </ListView.ItemTemplate>
                </ListView>
            </DataTemplate>
        </utu:FeedView.ValueTemplate>
        <utu:FeedView.ProgressTemplate>
            <DataTemplate>
                <ProgressRing IsActive="True" />
            </DataTemplate>
        </utu:FeedView.ProgressTemplate>
    </utu:FeedView>
</Page>

public partial class MainViewModel(ITodoService todoService) : ObservableObject
{
    [ObservableProperty]
    private ObservableCollection<TodoItem> _items = [];

    [ObservableProperty]
    private bool _isLoading;

    [RelayCommand]
    private async Task LoadItemsAsync()
    {
        IsLoading = true;
        try
        {
            var items = await todoService.GetAllAsync();
            Items = new ObservableCollection<TodoItem>(items);
        }
        finally
        {
            IsLoading = false;
        }
    }
}

<TextBlock Text="Welcome"
           xmlns:win="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
           xmlns:android="http://uno.ui/android"
           xmlns:ios="http://uno.ui/ios"
           xmlns:wasm="http://uno.ui/wasm">

    <win:TextBlock.Foreground>
        <SolidColorBrush Color="Blue" />
    </win:TextBlock.Foreground>

    <android:TextBlock.Foreground>
        <SolidColorBrush Color="Green" />
    </android:TextBlock.Foreground>
</TextBlock>

// Services/DeviceService.cs (shared)
public partial class DeviceService
{
    public partial string GetDeviceInfo();
}

// Services/DeviceService.wasm.cs
public partial class DeviceService
{
    public partial string GetDeviceInfo() => "WebAssembly";
}

// Services/DeviceService.Android.cs
public partial class DeviceService
{
    public partial string GetDeviceInfo() =>
        $"Android {Android.OS.Build.VERSION.Release}";
}

// Enable Hot Reload in App.xaml.cs
public App()
{
    this.InitializeComponent();

#if DEBUG
    // Enable Hot Reload
    this.EnableHotReload();
#endif
}

// Use Uno.Extensions for enhanced patterns
var builder = this.CreateBuilder(args)
    .Configure(host => host
        .UseConfiguration()
        .UseLocalization()
        .UseNavigation()
        .UseMvux()
        .ConfigureServices(services =>
        {
            services.AddSingleton<ITodoService, TodoService>();
        }));

© managedcode, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files (references) in catalog/Frameworks/Uno-Platform/skills/uno-platform of managedcode/dotnet-skills.

• SKILL.md
• manifest.json
• references/patterns.md

Open the folder on GitHubat commit 535dd55