Individual skill
cost-burn
Burn-rate trend over time with optional drift-alert exit code. Bins session spend into buckets, surfaces window-over-window delta, and can exit 1 when latest bucket exceeds prior mean by a configurable %. Distinct from `cost-trend` (benchmark drift); this tracks PRODUCTION spend trajectory.
plugins/ruflo-cost-tracker/skills/cost-burn/SKILL.md
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- Last checked
- Nov 6, 2026
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- Nov 7, 2026
- License
- MIT
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Burn-rate trend observability. The fourth leg of the cost-tracker forward-cost stack:
| Question | Skill |
|---|---|
| "Have we crossed a threshold?" (reactive) | `cost-budget-check` |
| "When will we cross a threshold?" (predictive) | `cost-projection` |
| "Could we have spent less?" (comparative) | `cost-counterfactual` |
| "Is daily burn ACCELERATING?" (trend) | **`cost-burn`** ← this |
## Algorithm
Implementation: [`scripts/burn.mjs`](../../scripts/burn.mjs).
1. Read all `session-*` records from `cost-tracking` namespace.