Using Jev as cheap verifiers to keep long-horizon agents on track, every turn
omarsar0 · x · 2026-09-20
Elvis Saravia (omarsar0) shares what he calls one of the craziest use cases for Jev: building a custom verifier for the /goal feature in his agent harness. The verifier checks whether the goal is actually complete after every turn, making continuous verification cheap enough to scale.
- These checks were previously handled by an expensive reasoning model; with Jev they can run more frequently, keeping agents on track
- His thesis: System One models are perfect for verification, and cleverly combining System One and System Two models extends harnesses further
- He believes this pattern will enable a new wave of scalable test-time compute methods and calls it an "insane unlock" for long-horizon agents
- Still early: he's seeing good results but needs to benchmark it; a full guide is coming in the next couple of days
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