blog-chart

blog-chart is a skill for Claude Code from Infrasity-Labs/dev-gtm-claude-skills. It costs 164 tokens per session (2,272 once invoked), scanned A, original, MIT.

A tool that creates accessible inline SVG charts for blog posts, including bar, donut, line, area, lollipop, and radar charts.

In plain words
What is it for?
It helps choose a chart type for a data pattern and generate responsive charts with labels, accessibility markup, and source attribution.
Why use it?
It turns data into visuals that can be embedded in posts and remain readable in both light and dark layouts.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

Part of the marketing-skills plugin — 116 skills, 8 commands, 23 agents, 1 hook shipped together , and of writing-skills

Good fit It helps choose a chart type for a data pattern and generate responsive charts with labels, accessibility markup, and source attribution.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/infrasity-labs/dev-gtm-claude-skills/blog-chart
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 Infrasity-Labs/dev-gtm-claude-skills --skill blog-chart
Clone the repo
git clone --depth 1 https://github.com/Infrasity-Labs/dev-gtm-claude-skills

Made for: Claude Code.

Or install marketing-skills, the plugin that ships this one along with the rest of its 116 skills, 8 commands, 23 agents, 1 hook.

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 blog-chart

README.md
[![agentmods](https://agentmods.dev/badge/skills/infrasity-labs/dev-gtm-claude-skills/blog-chart/github.svg)](https://agentmods.dev/skills/infrasity-labs/dev-gtm-claude-skills/blog-chart)
Your own site
<a href="https://agentmods.dev/skills/infrasity-labs/dev-gtm-claude-skills/blog-chart"><img src="https://agentmods.dev/badge/skills/infrasity-labs/dev-gtm-claude-skills/blog-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.

agentmods 80×15 button for blog-chart

Your own site · 80×15
<a href="https://agentmods.dev/skills/infrasity-labs/dev-gtm-claude-skills/blog-chart"><img src="https://agentmods.dev/badge/skills/infrasity-labs/dev-gtm-claude-skills/blog-chart.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 164 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,272 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 warn 7 Sept 2026
SkillSpector: 1 finding, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high Prompt Injection · line 91
    Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.
    Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
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 $0.00164 $0.02272
Opus 5 $0.00082 $0.01136
Sonnet 5 $0.00033 $0.00454
Haiku 4.5 $0.00016 $0.00227

Measured 9d ago against content hash 51555af1b511, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

blog-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 9d ago.

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.

.claude/skills/blog-chart/SKILL.md · 251 lines

How it starts

The opening of the file, as written. The whole thing — 251 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Blog Chart: Built-In SVG Data Visualization

Generates dark-mode-compatible inline SVG charts for blog posts. Invoked internally by blog-write and blog-rewrite when chart-worthy data is identified. Not a standalone user-facing command.

Styling source of truth: references/visual-media.md

Input Format

The writer or researcher passes a chart request:

Chart Request:
- Type: horizontal bar
- Title: "AI Citation Sources by Platform"
- Data: ChatGPT 43.8%, Perplexity 6.6%, Google AI Overviews 2.2%, Reddit 7.15%
- Source: Ahrefs, December 2025
- Platform: mdx (or html)

Chart Type Selection

Select based on the data pattern. Diversity is mandatory - never repeat a type within one post.

Data Pattern Best Chart Type
Before/after comparison Grouped bar chart
Ranked factors / correlations Lollipop chart
Parts of whole / market share Donut chart
Trend over time Line chart
Percentage improvement Horizontal bar chart
Distribution / range Area chart
Multi-dimensional scoring Radar chart

Styling Rules (Non-Negotiable)

All charts must work on both dark and light backgrounds:

Text elements:     fill="currentColor"
Grid lines:        stroke="currentColor" opacity="0.08"
Axis lines:        stroke="currentColor" opacity="0.3"
Background:        transparent (no fill on root SVG)
Subtitle text:     fill="currentColor" opacity="0.45"
Source text:        fill="currentColor" opacity="0.35"
Label text:        fill="currentColor" opacity="0.8"

Color Palette

Color Hex Use Case
Orange #f97316 Primary / highest value
Sky Blue #38bdf8 Secondary / comparison
Purple #a78bfa Tertiary / special category
Green #22c55e Quaternary / positive indicator

For text inside colored elements: fill="white" with fontWeight="800".

Standard SVG Shell (HTML)

<svg
  viewBox="0 0 560 380"
  style="max-width: 100%; height: auto; font-family: 'Inter', system-ui, sans-serif"
  role="img"
  aria-label="Chart description with key data point"
>
  <title>Chart Title</title>
  <desc>Description for screen readers with all key data points and source</desc>

  <!-- Chart content -->

  <text x="280" y="372" text-anchor="middle" font-size="10" fill="currentColor" opacity="0.35">
    Source: Source Name (Year)
  </text>
</svg>

Read the full file on GitHub · 251 lines

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. 9d ago First seen · 251 lines · 164 tokens per session scan A 51555af1b511

Subscribe to this mod's changes

blog-chart is a skill published in the GitHub repository Infrasity-Labs/dev-gtm-claude-skills (124 stars, last pushed 2mo ago), licensed MIT. It adds 164 tokens to every session and 2,272 once invoked, about $0.0008 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 2026-09-03.

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