Plot

clawback chart renderer

Run benchmark/bin/plot.js from the project root. It reads an analyzer output directory (the --out dir you gave benchmark/bin/analyze.js) and writes TWO SVGs to a charts directory. No dependencies — pure Node + string templating, so it runs anywhere clawback runs.

Usage

node benchmark/bin/plot.js --in runs/smoke --out runs/smoke/charts

--in must contain summary.json and report.csv (run .skills/bench first). The SVG is written to --out.

Charts emitted

Both SVGs draw the same figure — cumulative billable input tokens over turns, two lines (passthrough baseline vs clawback) with the gap between them shaded. The shade is honest about direction: green when clawback's line ends below passthrough (it spent fewer full-rate tokens — a real saving), red when clawback ends above (it spent more — a regression we never hide). The chart carries no per-turn reclaim callout; the report hero overlay owns that figure now, so a chart copy would only collide with it.

• tokens_saved.svg — the labeled, on-screen chart: legend, axes, ticks, and the title "Token Efficiency". This is what the report GUI shows.
• tokens_saved.bg.svg — the BARE share-card background: a 1200×630 white card with just the two lines + the filled wedge, zero <text>. The report GUI inlines this behind the scrim to build the downloadable / shareable PNG. Missing it ⇒ the share PNG is a solid card with no chart lines. (Backfill old runs that predate it with .skills/finish --all.)

One figure on purpose: the product story is "how many more tokens can you spend, because clawback saves your quota" — not a dashboard of stats, and never a dollar figure. Billable input = input_tokens + cache_creation_input_tokens (the full-rate buckets); cache_read is the discounted reuse and is excluded. Cost lives only in the analyzer's report.md appendix; it is never plotted.

Honest-claim discipline

The win is conditional on idle gaps: on a tight loop the baseline caches well too, so the gap trends to ~0 (no regression); it widens as gaps cross the 5-min / 60-min eviction boundaries. Read the chart by regime, never as one context-free number.

Reproducibility

The charts are a pure function of summary.json + report.csv; re-rendering the same analyzer output yields byte-identical SVGs.