That depends what your definition of tool is. He custom-makes jigs all the time, as those are bespoke for whatever particular shape of thing he’s making. But s

That depends what your definition of tool is. He custom-makes jigs all the time, as those are bespoke for whatever particular shape of thing he’s making. But saws, blades, chisels… maybe he could make them, but why? Metalworking is its own subject of mastery. AFAIK, he doesn’t often modify any tools of that sort. He spends time selecting the one he wants, yes.