AEGIS: Agentic Fraud Investigation System Built on TigerGraph and GraphRAG

A developer has built AEGIS (Agentic Evidence & Graph Intelligence System), a multi-layered fraud investigation platform created for the TigerGraph HHGOA challenge. The system goes beyond single fraud scores by mapping relationships between customers, cards, devices, transactions, and past investigations using a TigerGraph graph database. AEGIS uses an agentic orchestration loop that sequentially handles evidence gathering, uncertainty assessment, policy evaluation, and Next Best Action recommendations before any human authorization is granted. The platform integrates GraphRAG to pull context from historical cases and employs TigerGraph's Weakly Connected Components algorithm as a structural signal to detect coordinated fraud patterns. Key design principles enforce strict separation between fraud signals, verdicts, recommendations, and authorizations to prevent automated over-reach.