Adopt a 'human-on-the-bridge' evaluation posture for agents — supervise the steering, not every step

arXiv:2606.16871·medium signal

Human-on-the-Bridge (arXiv:2606.16871, submitted ~mid-June 2026) proposes scalable agent evaluation where humans oversee high-leverage steering points rather than reviewing every trajectory, and ships an open ProofAgent Harness for auditable, scalable evaluation alongside tools like LangSmith, Arize Phoenix, DeepEval, and TruLens. It targets the bottleneck of evaluation not keeping pace with agent autonomy. Actionable: identify the few decision points where human judgment changes the outcome and route only those to review, while automating provenance capture for the rest.