# Track Specification: Session Insights & Efficiency Scores

## Overview
Token usage over time, cost projections, efficiency metrics.

## Current State Audit
### Already Implemented
- session_logger.py
- Token counting

### Gaps to Fill
- No visualization
- No efficiency scoring

## Goals
- Token usage graphs
- Cost projections
- Efficiency scores

## Functional Requirements
- Rolling token history
- Cost calculation
- Efficiency algorithm

## Non-Functional Requirements
- Session comparison
- Export capability