No more!
I made a config with hammerspoon that makes the border of my screen glow orange when claude code is waiting for my input. It clears when I take the next action in the terminal.
It's not rocket science, but wanted to pass it along just in case anyone might find it useful!
I'd also be curious if anyone has found any other unique solutions to this. I know some people have created hardware devices to be notified. I just hate mac notifications, so I didn't want to use those.