A chart-making skill based on Edward Tufte’s guidelines for clear data graphics. It creates SVG or HTML charts with restrained decoration, labelled data, and proportional scales.

Designing, building, drawing, plotting, or rebuilding charts and graphs after review.

It helps avoid misleading proportions, unnecessary decoration, and hard-to-read labels when presenting data.

tufte-chart — Skill for Claude Code by gnurio

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add gnurio/tufte-vdqi-plugin --skill tufte-chart

Clone the repo

git clone --depth 1 https://github.com/gnurio/tufte-vdqi-plugin

Made for: Claude Code.

Or install tufte-vdqi, the plugin that ships this one along with the rest of its 2 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/gnurio/tufte-vdqi-plugin/tufte-chart/github.svg)](https://agentmods.dev/skills/gnurio/tufte-vdqi-plugin/tufte-chart)

Your own site

<a href="https://agentmods.dev/skills/gnurio/tufte-vdqi-plugin/tufte-chart"><img src="https://agentmods.dev/badge/skills/gnurio/tufte-vdqi-plugin/tufte-chart/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/gnurio/tufte-vdqi-plugin/tufte-chart"><img src="https://agentmods.dev/badge/skills/gnurio/tufte-vdqi-plugin/tufte-chart.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 105 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,275 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00105	$0.02275
Opus 5	$0.00053	$0.01137
Sonnet 5	$0.00021	$0.00455
Haiku 4.5	$0.00011	$0.00228

Measured 10d ago against content hash 6cc482ea0641, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

tufte-chart scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

The scan reads SKILL.md. This mod also ships 8 executable files (scripts/_svg_text.py, scripts/deflate.py, scripts/quartile_plot.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/tufte-chart/SKILL.md · 181 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

What ships with it

32 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

10d ago First seen · 181 lines · 105 tokens per session scan A 6cc482ea0641

Subscribe to this mod's changes

tufte-chart is a skill published in the GitHub repository gnurio/tufte-vdqi-plugin (303 stars, last pushed 1mo ago), with no licence file. It adds 105 tokens to every session and 2,275 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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tufte-chart