Harness Engineering Guide: Agent = Model + the Half You Control
aakashgupta · x · 2026-10-11
In this resource thread, Aakash Gupta shares 5 guides, headlined by his deep-dive on harness engineering: alongside prompt and context engineering, harness engineering has become the most important skill for AI products — Agent = Model + Harness, and the harness is the half you control.
He cites Addy Osmani's point that "a decent model with a great harness consistently beats a great model with a bad harness," using the Fable incident (an agent rm -rf'ing a dev machine after its sandbox failed) to show the harness should have caught it. The guide covers 4 harness types, a Personal OS learning case, case studies, and the Harness Spec.
Related event: Shipping AI Features Is Messier Than You Think(2 posts)→
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