Jev Engineering separates the decision layer from the reasoning layer
The post describes a loop of request, structured state, Jev router, cheapest capable model, checks, and execution gate, where the decision layer only routes, scores, blocks, and approves without writing prose.
Jev Engineering is the term for what turns an agent stack into an actual control system. It moves the expensive model out of every decision loop. Up to 193x faster. 444x cheaper. Measured, not theoretical. The core idea: The model shouldn't decide everything. Here's the actual shape of the loop: request → structured state → Jev router → cheapest capable model → worker → relevance / approval checks → execution gate → tool The important part isn't the diagram, it's this. The decision layers don't generate prose. They route. Score. Block. Approve. Nothing in that layer writes a sentence. So the expensive model only gets called when the task actually requires reasoning, not for every checkpoint along the way. That's the whole point of Jev Engineering: Separate reasoning from decision-making. Then make the decision layer measurable, cheap, and fast. Full breakdown in the article below. Follow @cyrilXBT, this is the architecture pattern most agent builders haven't caught up to yet.
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