I wonder what best practices here look like at this point. In my world, we've moved past skills for something like this, having porting helper/validator/etc things be harness level is measurably better than what skills look like right now. The open plugin spec is certainly an improvement (namely in packaging and distribution)- but, really you'd be leaving perf on the table if you were not to tune your harness. I wonder if something like dsh, pi, or other extensible (coding) harnesses have something like a concept of "harness as an extension".