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How automatic line tracing works — traceLine() in src/auto/trace/ (one click on a plotted series → its centreline or markers → suggested points) — and its benchmark (bench/lines/, npm run bench:lines): the fixed TraceRequest/TraceResult contract the Data-step UI codes against, the colour model, the column walker with gap bridging and retry, step corners, dotted lines, markers, resampling, the corpus and its truth format, and how the baseline gates regressions. Load it BEFORE editing anything in src/auto/trace/ or bench/lines/, before changing the contract or the worker/UI code that calls traceLine, when bench:lines reports a regression, when a trace follows the wrong series, loses a step corner or stops early, and when adding a figure to the line corpus. Skipping it risks breaking the UI's contract, DOM code in the worker-safe engine, "fixing" a failure by tuning the corpus, seeds or baseline instead of the tracer, or a suggestion applied without the user's Accept.
line-tracing is an agent skill entry in ChatHome Skills, sourced from GitHub Skill Search and scored 58/100. # Line tracing and its benchmark ## Rules 1. **The contract is fixed**: `src/auto/trace/types.ts` (`TraceRequest`, `TracedPoint`, `TraceResult`, `TraceMode`, `L. As an agent skill, it packages a reusable instruction set that AI coding agents such as Codex and Claude Code can load to perform this task without hand-written glue code. ChatHome Skills discovered this entry through its daily ingest of official registries and GitHub discovery queries, and re-verifies repository facts, freshness signals, and install metadata on every run. The quality score weighs official-registry presence, a working install command, license clarity, GitHub star trajectory, and repository freshness — the full formula is on the Sources page. The install command above is ready to copy. Review the last-pushed date and repository status before adding line-tracing to a production agent workflow; the snapshot facts below are point-in-time values from the most recent ingest.
codex skill install brianmanderson/UCSD_GraphEvaluatorReview the upstream source before running this command.
Scan coverage: Install metadata and the indexed document body.
Automated signals from install metadata and a bounded skill body — not a full code security audit and not a recursive source or dependency review.
# Line tracing and its benchmark ## Rules 1. **The contract is fixed**: `src/auto/trace/types.ts` (`TraceRequest`, `TracedPoint`, `TraceResult`, `TraceMode`, `LineStyle`; `TraceRes