OWN THE LOOP: A FIELD GUIDE TO AGENT HARNESSES

Summary from the TLDR AI newsletter

As coding models commoditize, the real differentiator is the harness: the control loop that manages tools, workflows, orchestration, and model routing. Vendor-native harnesses offer the best performance today, but owning a portable, model-agnostic loop may become the more durable advantage as models evolve and costs fall.