cost-trend
Read every docs/benchmarks/runs/*.json and surface drift in win rate, latency, escalation rate, and LLM-baseline cost over time
What this skill does
# Cost Trend The smoke gate is binary (`winRate ≥ 0.80` → pass/fail). The corpus benchmarks captured over time form a curve — and curves catch regressions the gate misses (win rate slowly creeping from 100% to 85% is "still passing" by smoke but a real degradation). This skill reads every persisted run in `docs/benchmarks/runs/*.json` and reports first→last deltas plus a per-run series, flagging regressions in win rate or latency. ## When to use - Before a release — check that the speedup hasn't drifted. - After expanding the corpus — verify older runs still hit the same win rate on the new corpus *they* reflected. - After upgrading `agent-booster` — surface latency / strategy changes. ## Steps 1. **Run the trend script** from the project root: ```bash node plugins/ruflo-cost-tracker/scripts/trend.mjs ``` Optional env: - `TREND_FORMAT=json` — emit JSON instead of markdown - `TREND_LIMIT=10` — consider only the most recent N runs 2. **Inspect the drift summary** — first vs last on win rate, avg latency, p99, escalation rate, speedup vs Gemini. 3. **Inspect the per-run series** — one row per run, including Sonnet 4.6 + Opus 4.7 baseline latencies if those were enabled (`BENCH_ANTHROPIC=1` at run time). 4. **Regression flags** — the script emits `> ⚠ Regression` callouts when: - Win rate dropped between first and last run - Avg latency rose ≥ 1.5× from first run ## Cross-references - `cost-benchmark` — the producer of the run JSONs this skill consumes - `bench/booster-corpus.json` — the corpus version is recorded in each run, so trends across corpus versions remain interpretable - `docs/benchmarks/runs/latest.json` — the most-recent run; smoke step 23 gates on `winRate ≥ 0.80` from this file
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