A while ago I wrote this article to help with SCOM side by side migrations from SCOM 2007. With the new Operations Management Suite wave and the possibility of agents reporting to an OMS workspace independently, visualizing agents that have been configured and/or have the OMS direct agent installed seems to be something that will be useful.
So, I have updated the management pack and it can be found here.
The basic difference is that you can see more information in the view:
As you can see above, some agents report to multiple workgroups as well as an OMS workspace.
Next steps in my backlog are tasks to configure an agent that has the agent (enable, disable, change workspace) and even perhaps upgrade the agent with the OMS binaries.
Hope this helps.