Harness Engineering: How to Build a Software Factory — Dru Knox, Tessl

This post introduces the concept of 'harness engineering' (or 'loop engineering') as the discipline for transitioning from using coding agents to running a 'software factory.' It defines a software factory by autonomy, automation, and quality, and breaks down the work into inner, outer, and meta loops. The talk highlights the challenges of harness engineering, such as rapid field changes and localized logging. It proposes a three-layer architecture: a control plane, an agent-ready stack, and improvement loops, with Tessl's skills registry, Tessl Agent, and Tessl Launch presented as practical implementations to achieve these goals.