I thought I needed something like this a couple months ago, but I instead now use the liminal time to self-reflect or think deeper about my work. I have always valued reflection and encourage others to try it while waiting for your agents.
Agree, and for longer waits I think reflection wins. This is aimed at the
narrower case: the 10-40s gaps too short to reflect or switch into, but long
enough that you reach for another tab and lose your place. Different wait
lengths suit different things, and that awkward sub-minute one is the slot I
was trying to fill.