Individual skill

cost-projection

Forward-looking spend extrapolation. Computes a USD-per-day rate from the recent measurement window, projects to 7d/30d/90d/365d horizons, and surfaces "days until budget exhausted" when a budget is configured. Predictive counterpart to `cost-budget-check` (reactive).

plugins/ruflo-cost-tracker/skills/cost-projection/SKILL.md

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Repository stars (not skill ratings): 81,279
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Forward-looking cost projection that pairs with `cost-budget-check`:

- **`cost-budget-check`** answers "have we crossed the line?" — reactive
- **`cost-projection`** answers "when will we cross the line?" — predictive

## Algorithm

1. Read all `session-*` records from the `cost-tracking` namespace (same source `cost-budget-check` uses).
2. Filter to a measurement window (default last 7 days on `capturedAt`/`startedAt`).
3. Compute the per-day burn rate: `windowSpend / windowDays`.
4. Linear-extrapolate to each requested horizon (default 7d/30d/90d/365d).
5. If a budget is configured (`budget-config` key set by `cost-budget set`):
   - Compute "days until 75% / 90% / 100% consumed" at the current rate.
   - Surface as a separate table block with `ALREADY REACHED` markers for thresholds already exceeded.