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charts

Generate inline chart images (PNG) for embedding in chat responses. Use this skill when you need to create bar, line, or area charts for data visualization in chat.

templates/analytics/.builder/skills/charts/SKILL.md

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Nov 7, 2026
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# Chart Generation

## How It Works

Charts are generated server-side as PNG images using `chartjs-node-canvas` (Chart.js) and served via `/api/media/`. The `generate-chart` script renders charts and returns a fully qualified URL for embedding in chat markdown.

## Script Usage

```bash
pnpm action generate-chart --type=bar --title="Title" --labels='["A","B","C"]' --data='[1,2,3]' --color="#18B4F4"
```

### Parameters