What 1,000+ Harness Experiments Taught Me About Self-Improving Agents

Project Repository: https://github.com/workofart/harness-experiment Update (July 2026): The follow-up, Training Self-Improving AI Agent Harnesses, turns these lessons into a deterministic training framework that allows for model-agnostic and task-environment-agnostic capability improvements. So I recently wanted to see whether an AI agent could self-improve a harness to solve terminal bench tasks.…