aspnetcore/src/Identity/samples/IdentitySample.DefaultUI/.config/dotnet-tools.json

{
  "version": 1,
  "isRoot": true,
  "tools": {
    "dotnet-ef": {
      "version": "3.0.0-preview3.19153.1",
      "commands": [
        "dotnet-ef"
      ]
    }
  }
}