Ah, I now see why you wrote 'agenty' instead of 'agency'. I thought you meant to use the term as a noun, in the sense of 'capacity for action'. But you were in fact using it as an adjective, to refer to the property that makes certain folks outgoing and willing to do things.

Your usage was probably inspired by Luke's "The Power of Agency", which makes use of the term 'agenty' (I only discovered this article a few minutes ago, after using the search box to look up that term).