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arXiv · 2601.22352

Recoverability Has a Law: The ERR Measure for Tool-Augmented Agents

Sri Vatsa Vuddanti·Satwik Kumar Chittiprolu
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Abstract

Language model agents often appear capable of self-recovery after failing tool call executions, yet this behavior lacks a formal explanation. We present a predictive theory that resolves this gap by showing that recoverability follows a measurable law. To elaborate, we formalize recoverability through Expected Recovery Regret (ERR), which quantifies the deviation of a recovery policy from the optimal one under stochastic execution noise, and derive a first-order relationship between ERR and an empirical observable quantity, the Efficiency Score (ES). This yields a falsifiable first-order quantitative law of recovery dynamics in tool-using agents. We empirically validate the law across five tool-use benchmarks spanning controlled perturbations, diagnostic reasoning, and real-world APIs. Across model scales, perturbation regimes, and recovery horizons, predicted regret under the ERR-ES law closely matched observed post-failure regret measured from Monte Carlo rollouts, within delta less than or equal to 0.05. Our results reveal that recoverability is not an artifact of model scale or architecture, but a governed property of interaction dynamics, providing a theoretical foundation for execution-level robustness in language agents.

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Sri Vatsa Vuddanti, Satwik Kumar Chittiprolu. 2026-01-29. Recoverability Has a Law: The ERR Measure for Tool-Augmented Agents. https://arxiv.org/abs/2601.22352

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