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cost-tracking

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Track and report Claude Code token usage, spending, and budgets from the local ECC cost-tracker metrics log. Use when the user asks about costs, spending, usage, tokens, budgets, or cost breakdowns by model, session, or date.

auc/skill_library/bundled/cost-tracking/SKILL.md

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# Cost Tracking

Use this skill to analyze Claude Code cost and usage history from the metrics log
that ECC's `stop:cost-tracker` hook writes.

## Where the data lives

The tracker appends one JSON object per session-stop to
`~/.claude/metrics/costs.jsonl`. Each row is a **cumulative snapshot for that
session**, so to total spend you take the **latest row per `session_id`** and
sum across sessions — summing every row multiply-counts.

Row schema:

| Field | Meaning |
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