AHE Deep Dive: How Coding Agent Harnesses Automatically Evolve

Introduction When building a coding agent, the capability of your base model is only part of the equation. In real production scenarios, what matters just as much is the harness wrapped around that model — the prompt, tools, middleware, memory, execution environment, trace, and evaluation pipeline. This is exactly what the AHE paper addresses: how to make a coding agent's harness continuously observable, modifiable, testable, rollback-able, and even self-iterating — just like software engineerin