Code as Agent Harness: Claude Code lead says stop prompting, design loops instead
solyarisoftware · x · 2026-09-06
- A paper reframes code itself as the agent harness: rather than treating planning, memory, tool use and execution as separate infrastructure, code becomes the unified execution layer through which agents reason, act, manage state, call tools, and verify their own work.
- It splits the idea into three layers: the harness interface (code connecting reasoning, actions and environment), the harness kernel, and the harness ecosystem.
- The quoted article "Loop Engineering" cites Boris Cherny, head of Claude Code at Anthropic: "I don't prompt Claude anymore. I have loops running that prompt" — arguing the shift is from writing prompts to designing the loops that drive agents.
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