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mcp-plots

MIT License
  • Apple
  • Linux

Plots MCP Server

A lightweight Model Context Protocol (MCP) server for data visualization. It exposes tools to render charts (line, bar, pie, scatter, heatmap, etc.) from tabular data and returns MCP-compatible image/text content.

Why MCP Plots?

  • Instant, visual-first charts using Mermaid (renders directly in MCP clients like Cursor)

  • Simple prompts to generate charts from plain data

  • Zero-setup options via uvx, or install from PyPI/Docker

  • Flexible output formats: mermaid (default), PNG image, or text

Quick Usage

  • Ask your MCP client: "Create a bar chart showing sales: A=100, B=150, C=80"

  • Default output is Mermaid, so diagrams render instantly in Cursor

Quick Start

PyPI Installation (Recommended)

pip install mcp-plots mcp-plots # Start the server

For Cursor Users

  1. Install the package: pip install mcp-plots

  2. Add to your Cursor MCP config (~/.cursor/mcp.json):

    { "mcpServers": { "plots": { "command": "mcp-plots", "args": ["--transport", "stdio"] } } }

    Alternative (zero-install via uvx + PyPI):

    { "mcpServers": { "plots": { "command": "uvx", "args": ["mcp-plots", "--transport", "stdio"] } } }
  3. Restart Cursor

  4. Ask: "Create a bar chart showing sales: A=100, B=150, C=80"

Development Installation

uvx --from git+https://github.com/mr901/mcp-plots.git run-server.py

Documentation → | Quick Start → | API Reference →

MCP Registry

This server is published under the MCP registry identifier io.github.MR901/mcp-plots. You can discover/verify it via the official registry API:

curl "https://registry.modelcontextprotocol.io/v0/servers?search=io.github.MR901/mcp-plots"

Registry metadata for this project is tracked in server.json.

Install with Smithery

This repository includes a smithery.yaml for easy setup with Smithery.

Example install using the Smithery CLI (adjust --client as needed, e.g. cursor, claude):

npx -y @smithery/cli install \ https://raw.githubusercontent.com/mr901/mcp-plots/main/smithery.yaml \ --client cursor

After installation, your MCP client should be able to start the server over stdio using the command defined in smithery.yaml.

Project layout

src/ app/ # Server construction and runtime server.py capabilities/ # MCP tools and prompts tools.py prompts.py visualization/ # Plotting engines and configurations chart_config.py generator.py

Requirements

  • Python 3.10+

  • See requirements.txt

Setup Routes

uvx (Recommended)

The easiest way to run the MCP server without managing Python environments:

# Run directly with uvx (no installation needed) uvx --from git+https://github.com/mr901/mcp-plots.git run-server.py # Or install and run the command uvx --from git+https://github.com/mr901/mcp-plots.git mcp-plots # With custom options uvx --from git+https://github.com/mr901/mcp-plots.git mcp-plots --port 8080 --log-level DEBUG

Why uvx?

  • No Environment Management: Automatically handles Python dependencies

  • Isolated Execution: Runs in its own virtual environment

  • Always Latest: Pulls fresh code from repository

  • Zero Setup: Works immediately without pip install

  • Cross-Platform: Same command works on Windows, macOS, Linux

PyPI (Traditional Installation)

  1. Install dependencies

pip install -r requirements.txt
  1. Run the server (HTTP transport, default port 8000)

python -m src --transport streamable-http --host 0.0.0.0 --port 8000 --log-level INFO
  1. Run with stdio (for MCP clients that spawn processes)

python -m src --transport stdio

Local Development (from source)

git clone https://github.com/mr901/mcp-plots.git cd mcp-plots pip install -e . python -m src --transport stdio --log-level DEBUG

Docker

docker build -t mcp-plots . docker run -p 8000:8000 mcp-plots

Environment variables (optional):

  • MCP_TRANSPORT (streamable-http|stdio)

  • MCP_HOST (default 0.0.0.0)

  • MCP_PORT (default 8000)

  • LOG_LEVEL (default INFO)

Tools

  • list_chart_types() → returns available chart types

  • list_themes() → returns available themes

  • suggest_fields(sample_rows) → suggests field roles based on data samples

  • render_chart(chart_type, data, field_map, config_overrides?, options?, output_format?) → returns MCP content

  • generate_test_image() → generates a test image (red circle) to verify MCP image support

Cursor Integration

This MCP server is fully compatible with Cursor's image support! When you use the render_chart tool:

  • Charts appear directly in chat - No need to save files or open separate windows

  • AI can analyze your charts - Vision-enabled models can discuss and interpret your visualizations

  • Perfect MCP format - Uses the exact base64 PNG format that Cursor expects

The server returns images in the MCP format Cursor requires:

{ "content": [ { "type": "image", "data": "<base64-encoded-png>", "mimeType": "image/png" } ] }

Example call (pseudo):

render_chart( chart_type="bar", data=[{"category":"A","value":10},{"category":"B","value":20}], field_map={"category_field":"category","value_field":"value"}, config_overrides={"title":"Example Bar","width":800,"height":600,"output_format":"MCP_IMAGE"} )

Return shape (PNG):

{ "status": "success", "content": [{"type":"image","data":"<base64>","mimeType":"image/png"}] }

Configuration

The server can be configured via environment variables or command line arguments:

Server Settings

  • MCP_TRANSPORT - Transport type: streamable-http or stdio (default: streamable-http)

  • MCP_HOST - Host address (default: 0.0.0.0)

  • MCP_PORT - Port number (default: 8000)

  • LOG_LEVEL - Logging level: DEBUG, INFO, WARNING, ERROR, CRITICAL (default: INFO)

  • MCP_DEBUG - Enable debug mode: true or false (default: false)

Chart Settings

  • CHART_DEFAULT_WIDTH - Default chart width in pixels (default: 800)

  • CHART_DEFAULT_HEIGHT - Default chart height in pixels (default: 600)

  • CHART_DEFAULT_DPI - Default chart DPI (default: 100)

  • CHART_MAX_DATA_POINTS - Maximum data points per chart (default: 10000)

Command Line Usage

With uvx (recommended):

uvx --from git+https://github.com/mr901/mcp-plots.git mcp-plots --help # Examples: uvx --from git+https://github.com/mr901/mcp-plots.git mcp-plots --port 8080 --log-level DEBUG uvx --from git+https://github.com/mr901/mcp-plots.git mcp-plots --chart-width 1200 --chart-height 800

Traditional Python:

python -m src --help # Examples: python -m src --transport streamable-http --host 0.0.0.0 --port 8000 python -m src --log-level DEBUG --chart-width 1200 --chart-height 800

Docker

Build image:

docker build -t mcp-plots .

Run container with custom configuration:

docker run --rm -p 8000:8000 \ -e MCP_TRANSPORT=streamable-http \ -e MCP_HOST=0.0.0.0 \ -e MCP_PORT=8000 \ -e LOG_LEVEL=INFO \ -e CHART_DEFAULT_WIDTH=1000 \ -e CHART_DEFAULT_HEIGHT=700 \ -e CHART_DEFAULT_DPI=150 \ -e CHART_MAX_DATA_POINTS=5000 \ mcp-plots

Cursor MCP Integration

Quick Setup for Cursor

The Plots MCP Server is designed to work seamlessly with Cursor's MCP support. Here's how to integrate it:

1. Add to Cursor's MCP Configuration

Add this to your Cursor MCP configuration file (~/.cursor/mcp.json or similar):

{ "mcpServers": { "plots": { "command": "uvx", "args": [ "--from", "git+https://github.com/mr901/mcp-plots.git@main", "mcp-plots", "--transport", "stdio" ], "env": { "LOG_LEVEL": "INFO", "CHART_DEFAULT_WIDTH": "800", "CHART_DEFAULT_HEIGHT": "600" } } } }

2. Alternative: HTTP Transport

For HTTP-based integration:

{ "mcpServers": { "plots-http": { "command": "uvx", "args": [ "--from", "git+https://github.com/mr901/mcp-plots.git@main", "mcp-plots", "--transport", "streamable-http", "--host", "127.0.0.1", "--port", "8000" ] } } }

3. Local Development Setup

For local development (if you have the code cloned):

{ "mcpServers": { "plots-dev": { "command": "python", "args": ["-m", "src", "--transport", "stdio"], "cwd": "/path/to/mcp-plots", "env": { "LOG_LEVEL": "DEBUG" } } } }

4. Verify Integration

After adding the configuration:

  1. Restart Cursor

  2. Check MCP connection in Cursor's MCP panel

  3. Test with a simple chart:

    Create a bar chart showing sales data: A=100, B=150, C=80

MERMAID-First Approach

This server prioritizes MERMAID output by default because:

  • Renders instantly in Cursor - No external viewers needed

  • Interactive - Cursor can analyze and discuss the diagrams

  • Lightweight - Fast generation and display

  • Scalable - Vector-based, works at any zoom level

Chart Types with Native MERMAID Support:

  • line, bar, pie, areaxychart-beta format

  • histogramxychart-beta with automatic binning

  • funnel → Styled flowchart with color gradients

  • gauge → Flowchart with color-coded value indicators

  • sankey → Flow diagrams with source/target styling

Available Tools

render_chart

Main chart generation tool with MERMAID-first approach.

Parameters:

  • chart_type - Chart type (line, bar, pie, scatter, heatmap, etc.)

  • data - List of data objects

  • field_map - Field mappings (x_field, y_field, category_field, etc.)

  • config_overrides - Chart configuration overrides

  • output_format - Output format (mermaid [default], mcp_image, mcp_text)

Special Modes:

  • chart_type="help" - Show available chart types and themes

  • chart_type="suggest" - Analyze data and suggest field mappings

configure_preferences

Interactive configuration tool for setting user preferences.

Parameters:

  • output_format - Default output format (mermaid, mcp_image, mcp_text)

  • theme - Default theme (default, dark, seaborn, minimal)

  • chart_width - Default chart width in pixels

  • chart_height - Default chart height in pixels

  • reset_to_defaults - Reset all preferences to system defaults

Features:

  • Persistent Settings - Saved to ~/.plots_mcp_config.json

  • Live Preview - Shows sample chart with current settings

  • Override Support - Use config_overrides for one-off changes

Documentation

Additional Resources

Chart Examples

Basic Bar Chart:

{ "chart_type": "bar", "data": [ {"category": "Sales", "value": 120}, {"category": "Marketing", "value": 80}, {"category": "Support", "value": 60} ], "field_map": { "category_field": "category", "value_field": "value" } }

Time Series Line Chart:

{ "chart_type": "line", "data": [ {"date": "2024-01", "revenue": 1000}, {"date": "2024-02", "revenue": 1200}, {"date": "2024-03", "revenue": 1100} ], "field_map": { "x_field": "date", "y_field": "revenue" } }

Funnel Chart:

{ "chart_type": "funnel", "data": [ {"stage": "Awareness", "value": 1000}, {"stage": "Interest", "value": 500}, {"stage": "Purchase", "value": 100} ], "field_map": { "category_field": "stage", "value_field": "value" } }

🔧 Configuration

Environment Variables

  • MCP_TRANSPORT - Transport type (streamable-http | stdio)

  • MCP_HOST - Host address (default: 0.0.0.0)

  • MCP_PORT - Port number (default: 8000)

  • LOG_LEVEL - Logging level (default: INFO)

  • MCP_DEBUG - Enable debug mode (true | false)

  • CHART_DEFAULT_WIDTH - Default chart width in pixels (default: 800)

  • CHART_DEFAULT_HEIGHT - Default chart height in pixels (default: 600)

  • CHART_DEFAULT_DPI - Default chart DPI (default: 100)

  • CHART_MAX_DATA_POINTS - Maximum data points per chart (default: 10000)

User Preferences

Personal preferences are stored in ~/.plots_mcp_config.json:

{ "defaults": { "output_format": "mermaid", "theme": "default", "chart_width": 800, "chart_height": 600 }, "user_preferences": { "output_format": "mcp_image", "theme": "dark" } }

🚀 Advanced Usage

Custom Themes

Available themes: default, dark, seaborn, minimal, whitegrid, darkgrid, ticks

High-Resolution Charts

uvx --from git+https://github.com/mr901/mcp-plots.git mcp-plots \ --chart-width 1920 \ --chart-height 1080 \ --chart-dpi 300

Performance Optimization

  • Use max_data_points to limit large datasets

  • MERMAID output is fastest for quick visualization

  • PNG output for high-quality static images

  • SVG output for scalable vector graphics

🐛 Troubleshooting

Common Issues

Issue: Charts not rendering in Cursor

  • Solution: Ensure output_format="mermaid" (default)

  • Check: MCP server connection in Cursor

Issue: uvx command not found

  • Solution: Install uv: curl -LsSf https://astral.sh/uv/install.sh | sh

Issue: Port already in use

  • Solution: Use different port: --port 8001

Issue: Large datasets slow

  • Solution: Sample data or increase --max-data-points

Debug Mode

uvx --from git+https://github.com/mr901/mcp-plots.git mcp-plots \ --debug \ --log-level DEBUG

📝 Notes

  • Matplotlib runs headless (Agg backend) in the container

  • For large datasets, sample your data for responsiveness

  • Chart defaults can be overridden per-request via config_overrides

  • MERMAID charts render instantly in Cursor for the best user experience

  • User preferences persist across sessions and apply to all charts by default

MCP directory API

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