Exo argues agent harnesses should be able to improve themselves

Alex Krentsel explains Exo, a proposed agent harness designed to inspect and modify its own components while it runs. He argues that isolating policy, context, tools, and execution can make recursive self-improvement more manageable, while an event history and architectural boundaries aim to limit loops and unsafe changes. The discussion also covers cloning, secrets, evaluation, and a reported production cost reduction, framing harness design as an increasingly important layer alongside model weights.