Beyond agent harnesses, I believe agent interfaces are an important direction for the development of self-evolving agents. This is connected to the idea of building for agents. You can pack so much into a good harness and interface that agents understand well. Think about the efficiencies you get. Costs you can reduce. More importantly, this lets agents work more effectively and reliably with interfaces that make sense for the task at hand. With Artifacts, we've already seen huge gains in…