A guide for creating interactive data visualizations with D3.js version 7, a JavaScript library for drawing charts and graphs. It supports formats such as standalone web pages and React components.

Use it to build bar charts, scatter plots, maps, treemaps, Sankey diagrams, force-directed graphs, and other D3 visualizations.

It gives developers a defined approach for fitting charts into one browser screen and choosing a suitable implementation format.

d3js — Skill by reggiechan74

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.

agentmods

npx agentmods add skills/reggiechan74/cc-plugins/d3js

Any agent

npx skills add reggiechan74/cc-plugins --skill d3js

Clone the repo

git clone --depth 1 https://github.com/reggiechan74/cc-plugins

Made for: Claude Code, Codex.

Per session 142 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 5,049 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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.

Model	Per session	Once invoked
Fable 5	$0.00142	$0.05049
Opus 5	$0.00071	$0.02524
Sonnet 5	$0.00028	$0.01010
Haiku 4.5	$0.00014	$0.00505

Measured 2d ago against content hash 035f3525b72f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

d3js 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 2d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (examples/separate-js/chart.js), 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.

d3-visualizations/skills/d3js/SKILL.md · 374 lines

How it starts

The opening of the file, as written. The whole thing — 374 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Create any D3.js data visualization quickly and correctly using D3 v7. This skill supports two workflows: direct implementation (default) for fast, professional output, and creative mode for artistic, philosophy-driven visualizations. Three output formats are available: standalone HTML, HTML + separate JS, and React components.

Default Configuration

These defaults apply to every visualization unless the user explicitly overrides them. The assumption is that the user will PDF, screenshot, or otherwise export the result for insertion into another document.

Layout: Single Screen, No Scrolling

Every visualization MUST fit entirely within a single browser viewport (100vh) with no scrolling required. This is non-negotiable.

Implementation rules:

Set html, body { height: 100vh; overflow: hidden; } on standalone HTML output
Use body { display: flex; flex-direction: column; } with flex: 1 on the chart container to fill available space
Use compact padding (0.5rem–0.75rem), gaps (0.5rem), and font sizes
SVGs fill their containers via CSS (width: 100%; height: 100%) rather than fixed pixel dimensions
Titles and labels use small but readable sizes (0.7–0.85rem for titles, 10–11px for axis text)
When multiple charts share a page (dashboards), use CSS Grid with fractional rows (1.2fr 1fr) and min-height: 0 on flex children to prevent overflow

Sizing: Responsive viewBox, Not Fixed Pixels

Always use viewBox on SVGs — never set fixed width/height attributes
Do not set inline style("height", "auto") on SVGs — let CSS control sizing
Set preserveAspectRatio="xMidYMid meet" on charts that need to maintain proportions (donut, pie, radial layouts)

Visual Style: Clean and Professional

Color palette: Muted, purposeful colors from d3.schemeTableau10 or curated palettes. No rainbow, no random RGB.
Typography: System font stack (-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif). No external font loads.
Background: Light gray page (#f0f2f5), white chart panels with subtle box shadow
Axes: Light gray gridlines (#f3f4f6), gray tick labels (#6b7280), no heavy borders
Margins: Generous enough for labels but not wasteful. Verify long labels (like "Natural Gas") are not truncated.

Read the full file on GitHub · 374 lines

Files

What ships with it

25 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.

2d ago First seen · 374 lines · 142 tokens per session scan A 035f3525b72f

Subscribe to this mod's changes

d3js is a skill published in the GitHub repository reggiechan74/cc-plugins (6 stars, last pushed 3mo ago), licensed MIT. It adds 142 tokens to every session and 5,049 once invoked, about $0.0007 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 2026-08-31.

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