How to resolve the dependency on Microsoft.EntityFrameworkCore.SqlServer and Microsoft.EntityFrameworkCore.Tools?

I believe it's because you don't have Microsoft. Try this, EntityFrameworkCore:

    "dependencies": {
        "Microsoft.NETCore.App": {
          "version": "1.0.0",
          "type": "platform"
        },
        "Microsoft.EntityFrameworkCore": "1.0.1",
        "Microsoft.EntityFrameworkCore.SqlServer": "1.0.1",
        "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview3-final"
    }

The modifications in the project won't need you to use Nuget to restore the packages. Those packages need to be automatically restored by json.

The following is effective for me; if it isn't for you, maybe there is another solution; please let me know.