When Evaluators Cry Wolf: Lessons From Production LLM-As-Judge Evaluation In Educational AI

MagicSchool's K-12 AI product suite is used by millions of teachers and serves millions of teacher and student messages each month. Our team monitors output along four priority dimensions--student safety, tone and instructional role, pedagogical value, and structural output quality--and tracks how often it fails on each. As our program matured, false positives came to dominate the evaluators' flags, misdirecting scarce analyst attention away from failures that warrant product change. To address this, we deployed three enhancements--unanimous-fail panels of repeated judge runs, per-evaluator judge-model choices, and softened rubrics--backed by a pair of synthetic datasets: a benchmark that measures how often cases are flagged, and an egregious-failure set as a check that severe cases still fail. That set is human-reviewed, with 12 to 79 cases per evaluator, each designed to exhibit an unambiguous violation of the failure mode it targets. Across 21 deployed evaluators, final configurations reached a median benchmark activation rate of 0.04% (16 of 21 at or below 0.2%; 8 at 0.00%). The strategy cuts confirmed false-positive flags by 99% and raises per-flag precision from 0.6% to 49%, while holding egregious-failure capture at 100% and improving it on 8 of 21 evaluators.