Making Use of Demands and Capabilties on VSTS Build Agents

Hello! I have recently been creating a pipeline in VSTS that will check if certain software/PowerShell Modules are installed on the box, and if it isn’t then install it. It’s a sort of a DSC/Chef/Puppet process done via VSTS so that I don’t have to configure the aforementioned software. But I needed a way to target a specific build agent to run this build on; specifying an agent pool is no good as it will deploy on any in that pool.