Vega-Lite

community

Generate visualizations from fetched data using the VegaLite format and renderer.

Data Visualization MCP Server

Overview

A Model Context Protocol (MCP) server implementation that provides the LLM an interface for visualizing data using Vega-Lite syntax.

Components

Tools

The server offers two core tools:

```
save_data
```
- Save a table of data agregations to the server for later visualization
- Input:
  - ```
  name
```
  (string): Name of the data table to be saved
- ```
data
```
    (array): Array of objects representing the data table
- Returns: success message
```
visualize_data
```
- Visualize a table of data using Vega-Lite syntax
- Input:
  - ```
  data_name
```
  (string): Name of the data table to be visualized
- ```
vegalite_specification
```
    (string): JSON string representing the Vega-Lite specification
- Returns: If the
```
--output_type
```
  is set to
```
text
```
  , returns a success message with an additional
```
artifact
```
  key containing the complete Vega-Lite specification with data. If the
```
--output_type
```
  is set to
```
png
```
  , returns a base64 encoded PNG image of the visualization using the MPC
```
ImageContent
```
  container.

Usage with Claude Desktop

# Add the server to your claude_desktop_config.json
{
  "mcpServers": {
    "datavis": {
        "command": "uv",
        "args": [
            "--directory",
            "/absolute/path/to/mcp-datavis-server",
            "run",
            "mcp_server_datavis",
            "--output_type",
            "png" # or "text"
        ]
    }
  }
}