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Abstract
This paper presents FINO, a visual analytics tool developed for the VAST 2026 Challenge to investigate an embargo breach within a multi-agent system. To analyze agent decision-making and uncover the root cause of the leak, FINO integrates three core components: a Semantic Matrix contrasting expected with observed behaviors, a Breach Reconstruction utilizing a causal graph to map events leading to the incident, and an Evidence Ledger that rigorously traces all analytical conclusions back to exact source records.