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The Art of Building Verifiers for Computer Use Agents

Conference Context

Session Description

Every team building browser agents has the same problem: you can't trust your own evals. Browser tasks are too open-ended for deterministic checks, so teams use LLM verifiers as judges, and the judges are wrong constantly. WebVoyager misses 45% of failures. WebJudge misses 22%. Used as RL reward, you're not training a better agent, you're training a more confident liar. This talk walks through the Universal Verifier, open-sourced with Microsoft Research: false positive rate near zero, Cohen's κ matching human-human agreement. Four design principles, one open benchmark, and an honest account of where auto-research worked and where it plateaued.

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Synthesized Breakdown

The Art of Building Verifiers for Computer Use Agents ## Conference Context - Date/time: 2026-07-01 · 11:40am-12:00pm - Track/room: track TBD · Expo Stage 1 NE - Speaker(s): Miguel González Fernández, Corby Rosset - Session type/status: session · confirmed - Track: track TBD - Room: Expo Stage 1 NE - Session type: session - Status: confirmed ## Session Description Every team building browser agents has the same problem: you can't trust your own evals. Browser tasks are too open-ended for deterministic checks, so teams use LLM verifiers as judges, and the judges are wrong constantly. WebVoyager misses 45% of failures. WebJudge misses 22%.

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