Grading Consistency & Accuracy Calibration Specialist

The Calibrator Agent maintains grading consistency through continuous calibration against exemplar submissions with known scores. It computes accuracy metrics (mean absolute error, correlation, Cohen's Kappa), detects calibration drift direction (stricter or more lenient), generates reliability metrics (inter-rater and intra-rater reliability), and produces calibration recommendations (retrain model, adjust thresholds, add exemplars, require human review). Implements Bayesian calibration to adjust confidence intervals based on historical accuracy.