nuget.config

<configuration>
  <packageSources>
    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
    <add key="myget.org" value="https://www.myget.org/F/cake/api/v3/index.json" protocolVersion="3" />
  </packageSources>
</configuration>

Program.cs

using System;
using Cake.Common.Diagnostics;
using Cake.Core;
using Cake.Core.Diagnostics;
using Cake.Frosting;

public class Program
{
    public static int Main(string[] args)
    {
        // Create the host.
        var host = new CakeHostBuilder()
            .WithArguments(args)
            .UseStartup<MyStartup>()
            .Build();

        // Run the host.
        return host.Run();
    }
}

public class MyStartup : IFrostingStartup
{
    public void Configure(ICakeServices services)
    {
        services.UseContext<MySettings>();
    }
}

public class MySettings : FrostingContext
{
    public bool Magic { get; set; }

    public MySettings(ICakeContext context)
        : base(context)
    {
        // You could also use a CakeLifeTime<Settings>
        // to provide a Setup method to setup the context.
        Magic = context.Arguments.HasArgument("magic");
    }
}

[TaskName("Provide-Another-Name-Like-This")]
public class Build : FrostingTask<MySettings>
{
    public override bool ShouldRun(MySettings context)
    {
        // Don't run this task on OSX.
        return context.Environment.Platform.Family != PlatformFamily.OSX;
    }

    public override void Run(MySettings context)
    {
        context.Information("Magic: {0}", context.Magic);
    }
}

[Dependency(typeof(Build))]
public class Default : FrostingTask
{
    // If you don't inherit from the generic task
    // the standard ICakeContext will be provided.
}

project.json

{
  "version": "0.1.0-*",
  "buildOptions": {
    "emitEntryPoint": true
  },
  "dependencies": {
    "Autofac": "4.1.0",
    "Cake.Frosting": "0.1.0-alpha0006",
    "Microsoft.NETCore.App": {
      "type": "platform",
      "version": "1.0.0"
    }
  },
  "frameworks": {
    "netcoreapp1.0": {
      "imports": [ "dnxcore50" ]
    }
  },
  "tools": {
    "Cake.Frosting.Cli": "0.1.0-alpha0006"
  }
}