The Hermes HUD is a browser-based monitoring interface for the Hermes AI agent system. It provides real-time observability via WebSocket updates across 18 tabs, including executive dashboard, health diagnostics, model analytics, cost tracking, and gateway tool routing. Users can view managed-tool status for web search, image generation, TTS, and browser automation, manage OAuth providers, and control plugin enablement. The Plugin Hub displays installed extensions, runtime status, required auth setup, and safe update actions.