In Workflows we have many API actions and many Library actions too.
The problem is that when you look at the list of actions, it always takes time to understand whether I am looking at the APIs or at the Library. Because they are visually the same and the structure is often similar too.
So my suggestion is to make different icon colors for Library actions. For both actions itself and for folders too.
I think green for actions and pink (or gray) for folders would be ok.