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AI Agent Harness Engineering Architecture & Runtime Cheat Sheet

A comprehensive reference guide to AI Agent Harness engineering and runtime scaffolds: comparing bare LLMs against harnessed agents, exploring the 6 core pillars of harness architecture, detailing a 10-step closed-loop bug-fixing workflow, and comparing top industrial harnesses (Claude Code, Devin, SWE-agent, OpenHands) with 5 golden engineering rules.

Open cheat sheet