Lilian Weng 7/4/2026

Harness Engineering for Self-Improvement

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This article discusses recursive self-improvement (RSI) in AI, tracing its origins to I.J. Good (1965) and Yudkowsky (2008). It emphasizes the importance of harness engineering—the system surrounding a base AI model that orchestrates execution, tool use, planning, and evaluation. The post compares harnesses to operating systems and outlines design patterns like workflow automation, using examples such as Karpathy's autoresearch repo. It targets AI researchers and engineers interested in self-improving agents, deployment systems, and technical design patterns.

Harness Engineering for Self-Improvement

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