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M. Aksoy

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Bachelor thesis (2026) - M. Aksoy, B. Özkan, A. Panichella, Z. Seyedghorban
We investigate whether specification-based fault localization (spec-based FL) can identify failure modes and families in failing LLM-based multi-agent systems (LLM-MAS), evaluated on the MAST Multi-Agent Debate (MAD) dataset. We implement a six-stage pipeline that extracts global and dynamic behavioral constraints from execution traces, evaluates them step-by-step, and uses the resulting violation log to drive an LLM judge toward a structured failure diagnosis.

On the 18-trace human-annotated MAD-Human dataset, the pipeline achieves 33.3% strict mode and 50.0% strict family accuracy, compared to 5.6% and 22.2% for a no-specification baseline; comparable gains are observed on a 14-trace HyperAgent SWE-Bench-Lite subset. Analysis of constraint violation logs suggests that the taxonomy targets carried by constraints, not their syntactic type, may be a primary driver of diagnostic accuracy, and that three constraints per step achieves equivalent accuracy to five at substantially lower cost. ...