ConvolutedChicken69

, does it take the agent off the queue? does it know it's not available to take tasks?

You mean will it "release" the GPU? (i.e. the agent will pull another Task) ?
If so, then no it will not, an "Interactive Session" session is (from the agent's perspective) a Task that will end sometime, and it will continue to monitor and run it, until you manually close it. The idea is that you are actually using the GPU, hence no on else can run a job on it.
To shut it down, in the clearml-session CLI you just type "shutdown", Hmmm come to think about it, maybe we should have a command for it?