I had a little play around with the claw last night. I was only playing briefly, but I launched a standard ship into circular orbit in preparation for an incoming asteroid and to do some tests. I had plenty of fuel left, so decided to decouple the high altitude stage and then turn around and grab it with the claw. I deployed it so the little grabby hand came out and then proceeded to try and grab the fuel tanks. It was essentially one of the new 2x enginge NASA booster and a big orange tank. I tried at multiple points on it. The discarded tanks were classed as debris, so I thought it could be an interesting tool to deorbit anything that I leave in space after a launch and tidy up. It appeared that the claw didn't grab onto it or act anything like a docking port. I aimed for several parts, but got the same results. Aside from deploying it, is there any other action required? Should it just engage on an object by just touching it with a deployed arm? Does it just grab Kerbals and Asteroids?