You just need to write this in Conditional Branch: 

isSlotOnCooldown('your slot name')

I used to use it in early versions but starting from version X (I don't remember the numbers), I removed all conditional branches including slotOnCooldown to reduce the complexity of the plugin further. Then, when people asked to put them back, I put them back but didn't test them again. I'll test it again now and will tell you the result later. Don't forget to join the Discord and send a message there so I can tag you when the result is ready.

Hi hi, the update is ready, please update and see if isSlotOnCooldown works.

https://sanghendrix.itch.io/hotbar-creator-rpg-maker-mv-mz-plugin/devlog/946954/...

Yeah I'll fix those. Are you using for MV? Also can you tell me what case scenario you're using it for?

Unfortunately, I'll only make adjustments or add new features that benefit majority of people. I don't adjust my plugin to a particular project anymore due to it overcomplicating the plugin, which make it harder to maintain in the long run. For now, I'll only fix conditional branches for MV.