Well, not really a tool, I suppose, as the thing is pretty useless. (I suppose it could be used as a fishing weight maybe.
I was on the beach the other day (yes, the beach, in England, in April! - the kids even went in the sea!) and my eye was drawn to a nicely triangular piece of stone (I think it is actually a piece of worn-down terracotta tile). I was bored, so I thought I would see if I couold make a hole in it with nothing more than what I could find around me (flint pebbles) - as you can see, it worked rather well.
There is something rather satisfying about making stone tools.
You may want to see if you can find a local person who knows how to knap flint or somesuch. I’ve made an arrowhead, and I found it to be quite the experience.
If I were you, I would get a piece of leather cord, and wear that around my neck as a symbol of your sentience.
There’s a theory that if you toss a triangle into the sea, and come back the next day, not only will you find the triangle a few yards from where you chucked it, but it’ll be much smoother and more refined.
The hole is exactly (and by complete fluke) 5mm in diameter, just the right size for an LED (could make quite an interesting object, fusion of technology and nature etc…blah blah)