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Jun Shen

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#artificial intelligence Preprint Aug 2026

VACS: Value-Aligned Compositional Shielding for Multi-Agent Reasoning

VACS (Value-Aligned Compositional Shielding) is a unified systems design with formalized interfaces and operational guarantees at the verifier-constrained decision level, rather than a complete end-to-end formal proof of all language-model internals.

Yi-Yao Zhang, Diksha Goel, Hussain Ahmad · 2 citations
Preprint Aug 2026

When the Judge Should Not Decide: Evidence-Locked, Non-Compensatory Selection Bounds LLM-Judge Failure in Reasoning Pipelines

An LLM judge deployed inside a reasoning pipeline does not merely measure quality, it decides which answer ships. We show that the cost of that decision depends less on judge accuracy than on the decision rule the judge is embedded in. On frozen candidate pools from four GRPO policies, an unconstrained scalar DeepSeek-...

Yi-Yao Zhang, Diksha Goel, Hussain Ahmad et al. · 0 citations
Preprint Aug 2026

CausalNav: Reliability-Certified Causal World Models for Control under Physical-Parameter Shift

CausalNav, a controller built around a signed, action-conditioned transition graph over identified state coordinates, is studied with CausalNav, a controller built around a signed, action-conditioned transition graph over identified state coordinates, which attains the best average rank.

Yi-Yao Zhang, Diksha Goel, Hussain Ahmad et al. · 0 citations

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