// Addy Osmani · 19 April 2026

Agent Harness Engineering

A coding agent is the model plus everything you build around it: prompts, tools, context policies, hooks, sandboxes, feedback loops. Harness engineering is the discipline of treating that scaffolding as a first-class artifact, and tightening it every time the agent slips.

Addy Osmani

@addy-osmani

addyosmani.com

Addy Osmani@addy-osmani