daily-budget-check

# Daily Budget Check A fast daily pulse: are you on pace against today's budget? ## Input The user provides: **$ARGUMENTS** This is the **daily budget in dollars** — e.g. `"5"` or `"$5/day"`. If omitted, ask for one or derive it from a monthly budget (`monthly / days_in_month`) and state the assumption. ## Data Sources | Endpoint | Returns | |----------|---------| | `GET /api/pricing/cost` | `{ total_cost, breakdown: [{ model, input_tokens, output_tokens, cache_read_tokens, cache_write_tokens, cost, matched_rule }] }` — fleet-wide spend and the avg cost-per-session used to value today's sessions | | `GET /api/sessions?limit=200` | Session list with inline `cost` and `started_at` — filter to today (`DATE(started_at) = today`) to isolate today's spend | ## Method Spend has no per-day field, so isolate **today** from the session list: 1. **Today's sessions** = sessions whose `started_at` is today (local date). 2. **Today's spend** = sum of inline `cost` over today's sessions. If inline `cost` is absent for some rows, fall back to `today_session_count × (total_cost / total_session_count)` and flag it as approximate. 3. **Pace**: `fraction_of_day_elapsed = hours_since_midnight / 24`. `expected_by_now = daily_budget × fraction_of_day_elapsed`. 4. **Pace delta** = `today_spend − expected_by_now` (▲ ahead of budget / ▼ behind). 5. **End-of-day projection**: `projected_today = today_spend / fraction_of_day_elapsed` (linear extrapolation of the current pace). Guard against tin...