http://www.heyuan110.com/tags/harness-engineering/Recent content in Harness Engineering on Bruce on AI EngineeringHugoenSat, 04 Apr 2026 14:00:00 +0800http://www.heyuan110.com/posts/ai/2026-04-04-harness-engineering-guide/Sat, 04 Apr 2026 14:00:00 +0800http://www.heyuan110.com/posts/ai/2026-04-04-harness-engineering-guide/<p><img src="http://www.heyuan110.com/posts/ai/2026-04-04-harness-engineering-guide/cover.webp" alt="Harness engineering architecture — layered systems wrapping an AI agent core with guardrails, feedback loops, and monitoring" loading="lazy" decoding="async" fetchpriority="low" width="1200" height="630" /> </p> <p>In 2026, the AI engineering community discovered something counterintuitive: <strong>the model is the least important part of an AI agent</strong>. What actually determines whether an agent succeeds or fails in production is everything <em>around</em> the model — the tools it can access, the guardrails that keep it safe, the feedback loops that help it self-correct, and the monitoring systems that let you watch it work.</p>