How do you make an animation in a tool once you press a key?

I am making a war game and I need to make animations so that each tool has special keys to create animations.

For example, you can press T to throw stars once you equip the tool "Ninja Stars."

I know about this (click to play anim):

But how do i put an key in it and play an animation so the player with the tool equipped plays it whenever he presses T?