Banger paper from ByteDance Seed. If you are curious about self-evolving agent harnesses, this one is worth your time. (bookmark it) The proposes method, HarnessDev, stops scoring a model on the tasks it completes and scores it on the harness it builds. The agent starts from a weak but runnable seed plus a handful of cases, then builds a full execution system. A second stage hands that harness back and asks it to improve on downstream feedback. Both stages are scored on capability and on…