flint-chart

Flint is a visualisation intermediate language from Microsoft that lets AI agents create polished charts from simple, human-editable chart specs. Instead of asking agents or developers to tune verbose settings such as scales, axes, spacing, labels and layout, the Flint compiler derives optimised settings from the data, semantic types, chart type and encodings. The result is a compact specification that agents can produce reliably, people can edit directly, and multiple backends can render as native Vega-Lite, ECharts or Chart.js specs.

The repository has two main components: flint-chart, a JavaScript and TypeScript library that compiles the same input into those three backends, and flint-chart-mcp, an MCP server that lets agents create, validate and render charts from a chat or coding environment. Features include semantic chart specs using 70+ semantic types (such as Rank, Temperature, Price or Country), automatic layout based on data cardinality and canvas constraints, 30+ chart types across the three backends, and an MCP server that offers templates, validation and an interactive chart view. Install with `npm install flint-chart` or `npx -y flint-chart-mcp`; a Python package is not yet released and the current port is a source-only preview. It is MIT licensed.