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Jing-Zhou Xu

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Jul 2026

Phantom Guardrails: When Self-Improving Agent Harnesses Fix Failures That Never Happened

This work introduces the Counterfactual Fabrication Lab, a deterministic micro-lab where the correct action is known: do nothing, and presents the Counterfactual Fabrication Lab for measuring fabricated failures in self-improving agent harnesses.

Su Wang, Pinyan Qian, Yifan Lin et al. · 6 citations · ⚡2

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