# Tier 4: Monitoring & Feedback (Governance Layer)

Tier 4 acts as the "supervisor" of the entire architecture. It ensures the system is performing correctly, ethically, and efficiently, while providing a path for continuous evolution.

## Key Responsibilities

### 1. Performance Monitoring
*   Track latency, token usage, and error rates across all tiers.
*   Identify bottlenecks (e.g., a Tier 2 specialist that is consistently slow).

### 2. Evaluation & Feedback
*   Collect explicit user feedback (e.g., "Good/Bad" ratings).
*   Perform automated evaluation using "LLM-as-a-judge" to score responses based on accuracy, tone, and safety.
*   Log failures for manual review and human-in-the-loop (HITL) intervention.

### 3. Error Analysis & Root Cause
*   Analyze why specific routes failed or why a specialist produced a low-quality output.
*   Maintain a "lesson learned" database to inform future system prompts or fine-tuning.

### 4. Continuous Improvement
*   Inform the retraining or fine-tuning of Tier 2 models based on real-world usage patterns.
*   Optimize Tier 1 routing logic based on success/failure metrics.

## Tools & Techniques
*   **Logging/Observability:** (e.g., LangSmith, Weights & Biases, custom JSON-L logs).
*   **A/B Testing:** Compare different model versions or routing strategies.
*   **Red Teaming:** Proactively test the system for vulnerabilities and biases.