LangChain author explains how Jev handles yes/no calls in agents

Harrison Chase @hwchase17Originally posted 2026.10.10

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good framing from @ch3nweiii - a lot of agent steps are yes/no calls, not generation Jev answers those as typed questions with calibrated probabilities, so the frontier model sticks to the hard work where those calls sit in a harness: https://www.langchain.com/blog/building-a-harness-with-jev https://x.com/ch3nweiii/status/2108664035109470637

This post quotes another post: “Jev as a front-end decision model for agents, with cost figures”