I am trying to create a custom build server for Visual Studio Team Services in Azure. I have installed the build agent and Visual Studio Express on a virtual machine which is running and connected to my project on visualstudio.com as a build agent in the "Default" pool.

However when I tried to run a build I got the following error:

```
No agent found in pool 1 which satisfies the specified demands:
msbuild
visualstudio
vstest
Agent.Version -gtVersion 1.98.1

```

MSBuild was already in the list of capabilities on visualstudio.com but not the other two, so I dug through `C:\Program Files (x86)` and added these two capabilities to the list:

```
vstest: C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\CommonExtensions\Microsoft\TestWindow
visualstudio: C:\Program Files (x86)\Microsoft Visual Studio 14.0

```

The build then runs at least but I get another error during the "Test Assemblies" step. I think the most important part of the error message is `Unable to determine the location of vstest.console.exe`, here it is in full anyway: 

```
System.Management.Automation.CmdletInvocationException: Unable to determine the location of vstest.console.exe ---> System.IO.FileNotFoundException: Unable to determine the location of vstest.console.exe
at Microsoft.TeamFoundation.DistributedTask.Task.Internal.PowerShell.InvokeVSTestCmdlet.GetVsTestLocation()
at Microsoft.TeamFoundation.DistributedTask.Task.Internal.PowerShell.InvokeVSTestCmdlet.ProcessRecord()
at System.Management.Automation.CommandProcessor.ProcessRecord()
--- End of inner exception stack trace ---
at System.Management.Automation.Runspaces.PipelineBase.Invoke(IEnumerable input)
at System.Management.Automation.PowerShell.Worker.ConstructPipelineAndDoWork(Runspace rs, Boolean performSyncInvoke)
at System.Management.Automation.PowerShell.Worker.CreateRunspaceIfNeededAndDoWork(Runspace rsToUse, Boolean isSync)
at System.Management.Automation.PowerShell.CoreInvokeHelper[TInput,TOutput](PSDataCollection`1 input, PSDataCollection`1 output, PSInvocationSettings settings)
at System.Management.Automation.PowerShell.CoreInvoke[TInput,TOutput](PSDataCollection`1 input, PSDataCollection`1 output, PSInvocationSettings settings)
at Microsoft.TeamFoundation.DistributedTask.Handlers.PowerShellHandler.Execute(ITaskContext context, CancellationToken cancellationToken, Int32 timeoutInMinutes)
at Microsoft.TeamFoundation.DistributedTask.Worker.JobRunner.RunTask(ITaskContext context, TaskWrapper task, CancellationTokenSource tokenSource)

```

I have looked and `vstest.console.exe` is located in the `vstest` folder I specified above, I've also tried adding this folder to the system `PATH` but that makes no difference.

How can I set up a working build agent in Azure?