# Track Specification: Tool Usage Analytics (tool_usage_analytics_20260306)

## Overview
Analytics panel showing most-used tools, average execution time, and failure rates. Uses existing tool_log_callback data.

## Architectural Constraints
- **Efficient Aggregation**: Analytics MUST use efficient data structures.
- **Memory Bounds**: History MUST be bounded to prevent growth.

## Functional Requirements
- **Usage Ranking**: Show most-used tools ranked by count.
- **Avg Time**: Display average execution time per tool.
- **Failure Rate**: Track and display failure percentage per tool.
- **Time Series**: Show usage over time.

## Acceptance Criteria
- [ ] Tool ranking displayed.
- [ ] Average times accurate.
- [ ] Failure rates tracked.
- [ ] Time series visualization works.
- [ ] Uses existing tool_log_callback.