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Harness-of-Harness: Multi-Day Autonomous Software Development with Continual Improvement

arXiv · AI, language, vision and robotics · article · Sep 1, 2026 · UTC

This paper studies autonomous software development, in which LLM-based coding agents transform high-level requirements into complete, functional, and usable software systems without human intervention. We introduce Harness-of-Harness (HoH), a framework that enables coding agents to continually improve software during autonomous development. HoH operates on existing coding-agent harnesses, and organizes their executions into iterative planning-coding-testing loops. To sustain improvement across loops, HoH balances repair with capability growth, scopes development into small and verifiable incre

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