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eval-graphics

eval-graphics is a skill for Claude Code from elvisun/newsjack. It costs 47 tokens per session (2,260 once invoked), scanned A, original, MIT.

A chart-making skill for turning the numbers in an evaluation study into consistent publication figures. It creates standalone web charts, checks how they render, and saves PNG images for the study.

In plain words
What is it for?
It is for maintainers publishing evaluation or data studies: choosing chart layouts, replacing sample data with study data, validating the charts in a browser, and exporting screenshots.
Why use it?
It removes the need to design each study figure from scratch or manually check whether charts render correctly. It keeps figures in the same visual style across one publication.

Skill for Claude Code

Written for Claude Code: when-to-use in frontmatter.

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is node validate.mjs ../../<study>/runs/<run>/figures/<name>.html --out ../../<study>/runs/<run>/figures/png.

not rated 665repo +2 6d ago A scan SkillSpector: pass 47 tokens original MIT

Good fit It is for maintainers publishing evaluation or data studies: choosing chart layouts, replacing sample data with study data, validating the charts in a browser, and exporting screenshots.

Compare 6 skills from other repositories ↓
View source ↗ elvisun/newsjack newsjack.sh
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/elvisun/newsjack
agentmods
npx agentmods add skills/elvisun/newsjack/design-system

Made for: Claude Code.

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.

agentmods badge for eval-graphics

README.md
[![agentmods](https://agentmods.dev/badge/skills/elvisun/newsjack/design-system.svg)](https://agentmods.dev/skills/elvisun/newsjack/design-system)
Your own site
<a href="https://agentmods.dev/skills/elvisun/newsjack/design-system"><img src="https://agentmods.dev/badge/skills/elvisun/newsjack/design-system.svg" alt="Measured on agentmods" height="20"></a>
Per session 47 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,260 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00047 $0.02260
Opus 5 $0.00023 $0.01130
Sonnet 5 $0.00009 $0.00452
Haiku 4.5 $0.00005 $0.00226

Measured 8d ago against content hash bc24b4436c7d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

eval-graphics 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 8d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/validate.mjs), 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.

eval/design-system/SKILL.md · 153 lines

How it starts

The opening of the file, as written. The whole thing — 153 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Eval Graphics — the chart room

Internal tooling, not a product skill. This lives in eval/design-system/ and is used by maintainers to publish eval studies. It is not a Newsjack user skill, must never be installed into skills/, and is never loaded at product runtime. Do not confuse it with the main skills folder.

You produce figures for an eval study: standalone HTML that renders the Newsjack house chart style, validated by Playwright and screenshotted to PNGs you drop into a writeup. One grammar — newsprint paper, ink, a single vermilion mark — across every figure, so a study reads like one publication.

Files you work with

  • assets/colors_and_type.css — design tokens (palette, type, spacing). Never edit; always link.
  • charts.css — the chart primitives (.bar-primary, .line-base, .fig, .stat, heatmap classes, masthead/section/colophon scaffold). Never edit; always link.
  • chart-room.html — the specimen gallery of all 9 figure types with placeholder data. This is your copy-paste source: find the figure that fits your data, lift its block, swap the geometry and labels.
  • scripts/validate.mjs — Playwright validator + screenshotter.

The grammar (non-negotiable brand rules)

These come straight from the design system. Breaking one means the figure is off-brand:

  • One chroma. Vermilion #E05A47 is the only colour. The highlighted / winning series is accent; every other series is quiet grey (--c-base, #E4E0D8) or an ink wash. If you reach for a second colour, you've gone wrong. No gradients. No emoji. Ever.
  • Paper, not white. Background is --nj-page #F9F8F6. Borders are the hairline rgba(26,26,26,0.10). Cards are 0-radius with a faint editorial shadow.
  • Type roles. Figure titles: Newsreader italic. Axis ticks, value labels, legends, eyebrows: IBM Plex Mono, ALL CAPS, ≥0.12em tracking. Descriptive captions: DM Sans.
  • Value labels float above the bar (mono, centered over the column).
  • Headline figures are one consistent colour — the whole numeral and its symbol in the accent (e.g. +38%, 4.2× fully vermilion), via <span class="accent">.
  • Section pattern: top hairline → mono number + lowercase-italic title (left)
    • mono subtitle (right) → content.

Read the full file on GitHub · 153 lines

Files

What ships with it

7 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.

  1. 8d ago First seen · 153 lines · 47 tokens per session scan A bc24b4436c7d

Subscribe to this mod's changes

eval-graphics is a skill published in the GitHub repository elvisun/newsjack (665 stars, last pushed 6d ago), licensed MIT. It adds 47 tokens to every session and 2,260 once invoked, about $0.0002 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.

Browser automationDesign and UXFrontendProductivityagentsmarketingskills
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