Flint

Flint is a visualization intermediate language that enables AI agents to generate polished charts from simple, human-editable specifications.

Flint is a visualization intermediate language designed for AI agents to create expressive charts from high-level semantic specifications. Rather than requiring agents to define verbose parameters for labels, axes, or spacing, the system derives layout decisions from the data and an optional visual theme. The platform supports compilation into multiple formats, including Vega-Lite, ECharts, Chart.js, Plotly, and native Excel charts. It includes an MCP server to enable agents to validate and render charts directly within coding environments or chat interfaces. The library captures data context using 70+ semantic types such as Rank, Temperature, and Price to ensure accurate visual representation.

Flint at a glance

Best for: Software engineer, Founder
Runs on: Web, VS Code, CLI
Pricing: Free
Released: May 2026
Category: AI research tool
Website: github.com/microsoft/flint-chart

Key features

Compiles input into Vega-Lite, ECharts, Chart.js, Plotly, and Excel
Supports 70+ semantic data types for chart fields
Adapts layout sizing and spacing to data cardinality
Applies formal visual themes across different chart libraries
Includes an MCP server for integration with coding assistants
Generates interactive chart views or static PNG and SVG outputs

Use it for

Creating charts from JSON, CSV, or TSV data files
Standardizing chart design across different visualization libraries
Enabling AI agents to generate charts within chat environments
Developing charts with custom brand-specific visual themes

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