Introduction

Traditional RAG systems can only answer questions, but cannot know: whether the answer truly satisfies users, which step caused the error, whether system upgrades caused capability degradation, which strategy works better online.

Nexus Runtime introduces: Feedback Signals → Runtime Evaluation → Metrics → Trace → Repair Workflow → System Optimization

Forms a complete: Self-Governance Evaluation Loop

Core insight: User follow-up behavior is the most authentic quality signal.

This enables the system to continuously improve through real user interactions.