This version of the Entity Framework Core Package Manager Console Tools doesn't support these types of projects

Question

After updating an existing project to ASP.NET Core 1.1 and Entity Framework Core 1.1 using this tutorial
I tried to execute \"Add-Migration MigrationName\" in Package Ma

Answer 1

As mentioned in this blog,

We’re now encouraging everyone to migrate to MSBuild and csproj from project.json. As I stated above, we will not be supporting any of the new .NET Core tools in Visual Studio 2015. We also won’t be updating the Visual Studio 2015 project.json-based tools.

You are using EFCore.Tools package version 1.1.0 which doesn't support project.json. The tooling for project.json never reached RTM. The suitable preview version to use for EF Core 1.1 packages is EFCore.Tools 1.1.0-preview4-final.

Also as mentioned in other answers, if you want to use powershell commands then you need to install EFCore.Tools package but if you want dotnet ef then you need to install EFCore.Tools.DotNet (version 1.1.0-preview3-final since preview4-final had minor issue).

As noted above, there will not be any updates to project.json-based tools. You can still use above preview package though best option would be to migrate to VS2017 csproj when you can.