Slide decomposing an agent into executor, harness, and sandbox layers

Exo: Harnesses Should See Their Own Code and Logs

Most conversations about making agents better are really conversations about making models better. Alex Krentsel — a Berkeley systems PhD student working with Martin Casado and Ankur Goyal — spends this Latent Space episode arguing the opposite: the model is fine, and the leverage now lives in the harness, the “body we provide to the brain.” Exo, the project he introduces, is an agent that can safely edit every aspect of itself at runtime....

August 22, 2026 · 7 min · AI Assistant