Blog Chart

What it does

When your agent uses it

• The user mentions data visualization
• Comparison tables that need to be visualized
• Wants to embed inline SVG visualizations in a blog post
• Even if not invoking blog-write

Example prompts

• “blog chart”
• “generate chart”
• “data visualization”
• “/blog-chart”

Workflow steps

7 steps, taken from the first numbered list in SKILL.md.

1. 1Define chart area: x=80, y=40, width=440, height=280
2. 2Calculate bar height: chartHeight / dataCount - gap (gap=8)
3. 3Calculate bar width: (value / maxValue) * chartWidth
4. 4Position bars: y = chartY + index * (barHeight + gap)
5. 5Label on left (right-aligned at x=75): category name
6. 6Value label at end of bar: percentage or number
7. 7Source text at bottom center

What it can do on your machine

Read from SKILL.md and the folder at commit 02cfefb. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are xml, javascript, html and mdx).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Blog Chart loads about 2.1k tokens when it runs. Until then it costs about 199 tokens; SKILL.md has 636 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~199

When it runs · the whole SKILL.md, loaded when a task matches

~2.1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from Infrasity-Labs/dev-gtm-claude-skills at commit 02cfefb, republished under its MIT licence (© Infrasity-Labs). 636 words, ~2,090 tokens.

name

blog-chart

description

Generate dark-mode-compatible inline SVG data visualization charts for blog posts. Supports horizontal bar, grouped bar, donut, line, lollipop, area, and radar charts with automatic platform detection (HTML vs JSX/MDX). Enforces chart type diversity, accessible markup (role=img, aria-label), source attribution, and transparent backgrounds. Use whenever the user mentions data visualization, charts, graphs, comparison tables that need to be visualized, or wants to embed inline SVG visualizations in a blog post, even if not invoking blog-write. Use when user says "blog chart", "generate chart", "data visualization", "svg chart", "blog graph", "visualize data", or when the blog-write workflow identifies chart-worthy data points (3+ comparable metrics, trends, before/after data).

user-invokable

false

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)

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"

<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>

<svg
  viewBox="0 0 560 380"
  style={{maxWidth: '100%', height: 'auto', fontFamily: "'Inter', system-ui, sans-serif"}}
  role="img"
  aria-label="Chart description"
>
  <title>Chart Title</title>
  <desc>Description for screen readers</desc>

  {/* Chart content */}

  <text x="280" y="372" textAnchor="middle" fontSize="10" fill="currentColor" opacity="0.35">
    Source: Source Name (Year)
  </text>
</svg>

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

<figure className="chart-container" style={{margin: '2.5rem 0', textAlign: 'center', padding: '1.5rem', borderRadius: '12px'}}>
  <svg viewBox="0 0 560 380" style={{maxWidth: '100%', height: 'auto', fontFamily: "'Inter', system-ui, sans-serif"}} role="img" aria-label="[description]">
    <title>[Chart Title]</title>
    <desc>[Full description]</desc>
    {/* chart content with camelCase attributes */}
    <text x="280" y="372" textAnchor="middle" fontSize="10" fill="currentColor" opacity="0.35">
      Source: [Source Name] ([Year])
    </text>
  </svg>
</figure>

© Infrasity-Labs, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .claude/skills/blog-chart of Infrasity-Labs/dev-gtm-claude-skills.

Open the folder on GitHubat commit 02cfefb