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Chart Image
by
Danny Shmueli
· GitHub ↗
· v2.6.35
· MIT-0
13698
Downloads
17
Stars
0
Active Installs
15
Versions
Install in OpenClaw
/install chart-image
Description
Generate publication-quality chart images from data. Supports line, bar, area, point, histogram, candlestick, pie/donut, heatmap, multi-series, and stacked c...
Usage Guidance
Review before installing, especially on systems that process untrusted chart specs or publish SVG output. Prefer upgrading sharp and Vega-family dependencies first, and keep --spec, --csv-file, and --output paths controlled by trusted runtime code rather than free-form user text.
Capability Analysis
Type: OpenClaw Skill
Name: chart-image
Version: 2.6.35
The 'chart-image' skill is a legitimate utility for generating chart images using Vega-Lite and Sharp. The core logic in 'scripts/chart.mjs' handles data parsing and image rendering without any evidence of malicious intent, such as data exfiltration, backdoors, or unauthorized execution. The documentation in 'CAPABILITY.md' and 'SKILL.md' provides clear, safe instructions for the AI agent, specifically warning against shell injection vulnerabilities by recommending structured argument passing instead of string interpolation. No suspicious dependencies or obfuscated code were detected.
Capability Assessment
Credentials
Reading input files and writing output chart files is proportionate to the skill purpose, but users should choose output paths carefully because the script writes directly to the requested path.
Install Mechanism
Installation uses npm dependencies and the lockfile resolves vulnerable-era rendering packages, including sharp 0.33.5 and Vega-family packages; current advisories list sharp versions before 0.35.0 and 0.35.4 as affected by libvips/libheif issues. ([github.com](https://github.com/lovell/sharp/security/advisories/GHSA-f88m-g3jw-g9cj))
Instruction Scope
The invocation description is broad and the instructions include a hardcoded Israel-time dark-mode preference, but these affect chart styling and trigger breadth rather than giving the skill hidden authority.
Persistence & Privilege
The only persistence I found is generated chart files, including a recommendation to save under /data/clawd/tmp; there is no service installation, scheduled task, memory poisoning, or privilege escalation.
Purpose & Capability
The artifacts consistently describe a Node/Vega-Lite chart-image generator that reads JSON, CSV, stdin, or a Vega-Lite spec and writes PNG/SVG chart files; I found no unrelated credential access, exfiltration logic, background worker, or destructive behavior.
How to Use
- Make sure OpenClaw is installed (local or Docker)
- Run the install command in chat:
/install chart-image - After installation, invoke the skill by name or use
/chart-image - Provide required inputs per the skill's parameter spec and get structured output
Version History
v2.6.35
Add x-domain support for quantitative and temporal charts, plus updated docs/examples.
v2.6.23
- Added options for axis tick count control: `--x-ticks`, `--y-ticks`, and `--y2-ticks`
- Added legend layout controls: `--legend-columns` and `--legend-label-limit`
- Added explicit order option for multi-series and stacked legends: `--series-order`
- Added global font family theming with `--font-family`
- README and documentation updated to cover new options and usage
v2.6.18
Tighten capability docs to avoid risky shell-construction examples and reduce scanner-noisy guidance.
v2.6.17
Add y2-axis formatting, plus recent chart output and label control improvements.
v2.6.14
**2.6.14 includes expanded chart customization and new options for improved data visualization.**
- Added support for `--x-sort` (including `"none"` to preserve input order).
- New chart appearance controls: `--no-points`, `--line-width`, `--point-size`, and `--bar-radius`.
- Introduced `--last-value` option to annotate the final data point.
- Added `--y-pad` for vertical axis padding.
- Documentation updated to reflect all new options and defaults.
v2.5.1
chart-image v2.5.1
- Version bump from 2.4.0 to 2.5.1.
- Documentation updated (README.md, SKILL.md): no new features or options documented.
- No changes to code structure or CLI arguments are documented.
v2.4.0
- Added general dual-axis chart support with new CLI options: `--y2-field`, `--y2-title`, `--y2-color`, `--y2-type`
- Updated documentation to include dual-axis usage (bar/area/line overlays with independent right Y-axis)
- Bumped version to 2.4.0
v2.3.0
**2.3.0 Summary:**
This version introduces new features and enhancements for chart image generation.
- New option: `--subtitle` allows adding a subtitle below the chart title.
- New option: `--hline` enables horizontal reference lines (with support for color and labels).
- New option: `--annotation` for static text annotation on charts.
- New option: `--annotations` supports an array of event markers/timeline annotations.
- Improved documentation with examples for all new options.
v2.2.0
color-scheme now works on multi-series lines, stacked bars, pie/donut (was heatmap-only); added -o shorthand for --output
v2.1.0
Added: pie/donut, candlestick, heatmap, sparklines, volume overlay, temporal x-axis, multi-series, stacked bars. Alert options: --show-change, --focus-recent, --show-values.
v2.0.0
Major update with focus-recent, show-values, dark mode improvements
v1.2.0
**Adds multi-series, stacked bar, and sparkline chart options.**
- Added support for multi-series line charts via `--series-field` option.
- Introduced stacked bar charts using `--stacked` and `--color-field`.
- Enabled sparkline (mini inline) chart output with `--sparkline` flag.
- Updated documentation to describe new options and provide usage examples.
- Declared a capability block in SKILL.md for chart-generation.
v1.1.0
Added --focus-recent N to zoom into last N data points for alert-style charts
v1.0.1
Improved docs: added Fly.io deployment benefits, comparison with alternatives
v1.0.0
Initial release: Vega-Lite charts with dark mode, peak labels, change annotations
Metadata
Frequently Asked Questions
What is Chart Image?
Generate publication-quality chart images from data. Supports line, bar, area, point, histogram, candlestick, pie/donut, heatmap, multi-series, and stacked c... It is an AI Agent Skill for Claude Code / OpenClaw, with 13698 downloads so far.
How do I install Chart Image?
Run "/install chart-image" in the OpenClaw or Claude Code chat to install it in one step — no extra setup required.
Is Chart Image free?
Yes, Chart Image is completely free, licensed under MIT-0. You can download, install and use it at no cost.
Which platforms does Chart Image support?
Chart Image is cross-platform and runs anywhere OpenClaw / Claude Code is available (cross-platform).
Who created Chart Image?
It is built and maintained by Danny Shmueli (@dannyshmueli); the current version is v2.6.35.
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