by rhiever
Teaches AI coding agents to make clear, honest charts, and checks each one before you see it. For Claude Code, Codex, Cursor, and more.
# Add to your Claude Code skills
git clone https://github.com/rhiever/evident-chartsGuides for using ai agents skills like evident-charts.
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evident-charts is an open-source ai agents skill for AI coding assistants such as Claude Code, Codex CLI, and ChatGPT, built by rhiever. Teaches AI coding agents to make clear, honest charts, and checks each one before you see it. For Claude Code, Codex, Cursor, and more. It has 52 GitHub stars.
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Clone the repository with "git clone https://github.com/rhiever/evident-charts" and add it to your Claude Code skills directory (see the Installation section above).
evident-charts is primarily written in Python. It is open-source under rhiever on GitHub, so you can review or fork the full source.
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Teaches AI coding agents to make clear, honest charts, and checks each one before you see it. Works in Claude Code, Codex, Cursor, and more.

Left: a typical draft, with raw counts on a log scale, the EU total ranked among its own members, and rainbow colors that mean nothing. Right: the same data after evident-charts critiqued and rebuilt it.
Ask for a chart the way you already do. The skill loads on its own whenever your agent makes or reviews a chart.
Chart sales.csv for a LinkedIn post on which regions grew fastest.
Make one slide showing where our budget went last year.
Critique this chart and fix it. (attach the PNG, the script, or both)
Charts from coding agents tend to share the same tells:
evident-charts checks for each of these before the chart reaches you: with scripts where a rule can be checked in code, and with a review of the rendered image where it can't.
/plugin marketplace add rhiever/evident-charts
/plugin install evident-charts@evident-charts
npx skills add rhiever/evident-charts
Set --agent to claude-code, codex, cursor, gemini, github-copilot, or antigravity.
gh skill install rhiever/evident-charts evident-charts --agent claude-code --scope user
codex plugin marketplace add rhiever/evident-charts
codex plugin add evident-charts@evident-charts
The --auto-update flag keeps it current.
gemini extensions install https://github.com/rhiever/evident-charts --auto-update
Your agent runs the skill's check scripts on your machine with your project's Python. matplotlib charts need matplotlib. Other libraries are checked through an SVG export in headless Chrome (Plotly's image export already installs one); without Chrome, only the chart-spec checks and the image review run.
| Installed with | Update command |
|---|---|
| Claude Code | claude plugin marketplace update evident-charts && claude plugin update evident-charts@evident-charts |
| npx skills | npx skills update evident-charts |
| GitHub CLI | gh skill update evident-charts |
| Codex | codex plugin marketplace upgrade evident-charts && codex plugin add evident-charts@evident-charts |
| Gemini CLI | gemini extensions update evident-charts (automatic with --auto-update) |
Each rule carries a tag for how well it is supported: [E] experimental evidence, [P] practitioner consensus, [T] taste or convention. Your project's style guide overrides the house look and any [T] rule, but never an [E] integrity rule such as bars starting at zero. Every rule is cited in references/sources.md.
.plot, ggplot2, Plotly, Vega-Lite and Altair, and D3. House themes for the last four are in assets/themes/.Issues and pull requests are welcome. AGENTS.md covers the tests and the rule format; changes are listed in the changelog.
MIT. Built by Randy Olson.