Closing the verification loop: Observability-driven harnesses for building with agents

The article introduces "harness-first engineering," an approach designed to address the challenge of verifying AI-generated code by replacing manual reviews with automated, multi-layered verification harnesses. By providing AI agents with explicit invariants and rapid feedback loops—ranging from deterministic simulation testing to formal specifications—the authors demonstrate that complex systems can be safely and rapidly developed at a scale that exceeds human oversight.