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What it does

The render_chart tool lets the assistant create interactive charts inside the chat. When the assistant calls this tool, a Recharts-powered visualization is rendered inline — no external services or image generation needed.

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Supported chart types

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How it works

  1. You ask the assistant to visualize data (e.g., “chart this data”, “show me a bar chart”)
  2. The assistant calls render_chart with a chart specification
  3. The tool validates the data and returns a chart code block
  4. The UI renders it as an interactive Recharts visualization
Charts are rendered client-side in the web UI and desktop app. The gateway only validates the data and returns JSON — no images are generated server-side.

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Chart specification

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Cartesian charts (bar, line, area)

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Pie charts

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Handling missing data

Series values can be null to represent missing data points. The chart renderer treats null values as gaps — Recharts skips them gracefully in line and area charts, and omits them in bar charts.

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Limits

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Configuration

The render_chart tool is always registered — no external dependencies required. The chart palette follows the brand color tokens defined in @spaceduck/brand.