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SKILL verified MIT Self-run

Chart Image

skill-zebbern-claude-code-guide-chart-image · by zebbern

Generate publication-quality PNG chart images from data, supporting line, bar, area, candlestick, pie, and heatmap charts. Triggers when the user asks to visualize data, create a graph, plot a time series, or generate a chart for a report, alert, or dashboard. Runs as a lightweight, headless Node.js process without a browser.

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Install

$ agentstack add skill-zebbern-claude-code-guide-chart-image

✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

  • ✓ Prompt-injection patterns
  • ✓ Secret / credential exfiltration
  • ✓ Dangerous shell & filesystem operations
  • ✓ Untrusted network calls
  • ✓ Known-malicious package signatures

What it can access

  • ✓ Network access No
  • ✓ Filesystem access No
  • ✓ Shell / process execution No
  • ✓ Environment & secrets No
  • ✓ Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

View the full security report →

Verified badge

Passed review? Show it. Paste this badge into your README, it links to the public security report.

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[![AgentStack Verified](https://agentstack.voostack.com/badges/verified.svg)](https://agentstack.voostack.com/security/report/skill-zebbern-claude-code-guide-chart-image)

Reliability & compatibility

✓ Security review passed
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● 1mo ago

Declared compatibility

Claude CodeClaude Desktop

Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.

Preview Execution monitoring

We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.

How agent discovery & health will work →
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About

Chart Image Generator

Generate PNG chart images from data using Vega-Lite. Perfect for headless server environments.

Why This Skill?

Built for Fly.io / VPS / Docker deployments:

  • ✅ No native compilation - Uses Sharp with prebuilt binaries (unlike canvas which requires build tools)
  • ✅ No Puppeteer/browser - Pure Node.js, no Chrome download, no headless browser overhead
  • ✅ Lightweight - ~15MB total dependencies vs 400MB+ for Puppeteer-based solutions
  • ✅ Fast cold starts - No browser spinup delay, generates charts in , filePath=/data/clawd/tmp/my-chart.png

**Tips:**
- Save to `/data/clawd/tmp/` (persistent) not `/tmp/` (may get cleaned)
- Use `action=send` with `filePath` — `thread-reply` does NOT support file attachments
- Include a brief caption in the message text
- Auto-use `--dark` between 20:00-07:00 Israel time

---
*Updated: 2026-02-04 - Added --y-format (percent/dollar/compact/decimal4) and --subtitle*

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [zebbern](https://github.com/zebbern)
- **Source:** [zebbern/claude-code-guide](https://github.com/zebbern/claude-code-guide)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

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Versions

  • v0.1.0 Imported from the upstream source.

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