Sample of Spectre desired behaviour

Commands.cs

public class MyCommand : Command<MyCommandSettings> { /* TRIMMED */ }
public class MyOtherCommand : Command<MyOtherCommandSettings> { /* TRIMMED */ }

Program.cs

// EXTRACT ONLY
var app = new CommandApp();
app.Configure(config =>
{
    /*// Register commands. */
    config.AddProxy<ProxySettings>("proxy", profile =>
    {
        profile.AddCommand<MyCommand>("child");
        profile.AddCommand<MyOtherCommand>("other");
    });
    // Run the application.
});
return app.Run(args);

Settings.cs

public class ProxySettings {}

public abstract class SharedCommandSettings : ProxySettings
{
    [Argument(0, argumentName: "[Name]")]
    [Description("Name")]
    public virtual string Name {get;set;}
}

public sealed class MyCommandSettings : SharedCommandSettings
{
    [Option("--from <SOURCE>")]
    public string Source {get;set;}
}

public sealed class MyOtherCommandSettings : SharedCommandSettings
{
    [Option("--verbose")]
    public bool Verbose {get;set;}
}