Learn to build a harness, folks. It's not surprising to me that so many YC builders want to build domain-specific harnesses. If you work long enough on a domain-specific problem, you quickly realize the opportunity. But you also realize how important that harness will be to stay competitive in the agentic era. From a product perspective, harnesses open up interesting new surface areas and experiences for the services/products you provide. From a technical perspective, harnesses are how you…