http://www.heyuan110.com/tags/agentic-harness/Recent content in Agentic Harness on Bruce on AI EngineeringHugoenSun, 05 Jul 2026 10:00:00 +0800http://www.heyuan110.com/posts/ai/2026-07-05-loop-engineering/Sun, 05 Jul 2026 10:00:00 +0800http://www.heyuan110.com/posts/ai/2026-07-05-loop-engineering/<p><img src="http://www.heyuan110.com/posts/ai/2026-07-05-loop-engineering/cover.webp" alt="Loop engineering: the four-pillar cage an AI agent runs inside in 2026" loading="lazy" decoding="async" fetchpriority="low" width="1200" height="630" /> </p> <p>Here is the reframe that should change how you build agents in 2026: everyone is optimizing the animal, and the durable engineering is in the cage. The model is the animal — powerful, fast-improving, and increasingly a commodity you rent by the token. <strong>Loop engineering</strong> is the cage: the control loop that decides when to trim the agent&rsquo;s memory, when to slam the brakes, when to reject its own homework, and which tools it is allowed to touch. Swap Opus for GPT-5.x for Gemini and your agent gets a little smarter. Build the wrong loop and any of them will happily burn a $200 bill overnight and hand you a red CI. My core claim: <strong>the model is water and electricity; the loop and its guardrails are the moat.</strong></p>