signal that a animation substate machine is active

So im going to need to know when the animator has passed a certain substate machine

to do this i tried to create a script on the animation that the animation controller has to go through in order to enter any parts of the substate machine.

the problem is that i cant seem to acces the bool i created from inside my gameobjects script

another solution i came up with was to put a tag on everything, although that is pretty unpractical, and makes tags unusable for other things