Features:

See when they're typing, in world and in GUI, the visual gets faster and wackier the faster you type!:

See when they're In a GUI such as inventory, chest, crafting, etc, shows their hand moving and clicking around at a screen in front of them

See when they're Idle for over 5 minutes. Shows them fall asleep in world. Shows a Zz indicator in the tab player list

See idle state in player list:

Configs

If you aren't comfortable with any of the stuff the client sends to the server, you can disable each feature as you please on the client side so it isn't sent.

Notifying idle states in chat is default off.

Requires CoroUtil