AI agents don't fail loudly. They fail quietly.A node returns success. Passes corrupted data downstream. Wrong outputs. No error. No warning. You find out when a user complains. ARGUS fixes this. Catches silent failures the moment they happen — not four steps later. → Silent failure detection at every node boundary → Root cause tracing — exact node, exact field → Deterministic replay from any node LangGraph today. CrewAI + Google ADK coming next.