Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| MCP_HOST | No | Host address | 0.0.0.0 |
| MCP_PORT | No | Port number | 8000 |
| LOG_LEVEL | No | Logging level: DEBUG, INFO, WARNING, ERROR, CRITICAL | INFO |
| MCP_DEBUG | No | Enable debug mode: true or false | false |
| MCP_TRANSPORT | No | Transport type: streamable-http or stdio | streamable-http |
| CHART_DEFAULT_DPI | No | Default chart DPI | 100 |
| CHART_DEFAULT_WIDTH | No | Default chart width in pixels | 800 |
| CHART_DEFAULT_HEIGHT | No | Default chart height in pixels | 600 |
| CHART_MAX_DATA_POINTS | No | Maximum data points per chart | 10000 |
Schema
Prompts
Interactive templates invoked by user choice
| Name | Description |
|---|---|
| visualization_guide | Comprehensive instructions for using visualization tools in this MCP server. Provides step-by-step workflow guidance for generating charts from data, including tool usage patterns, field mapping strategies, and optimization tips for the best user experience. Returns: str: Detailed workflow instructions and best practices |
Resources
Contextual data attached and managed by the client
| Name | Description |
|---|---|
No resources | |
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
| configure_preferences | Interactive configuration tool for setting user preferences.
Parameters:
- output_format: "mermaid", "mcp_image", or "mcp_text"
- theme: "default", "dark", "seaborn", "minimal", etc.
- chart_width: Chart width in pixels
- chart_height: Chart height in pixels
- reset_to_defaults: Reset all preferences to system defaults
If no parameters provided, shows current configuration with sample.
|
| render_chart | Render a chart from tabular data and return MCP-compatible content.
Special modes:
- chart_type="help": Returns available chart types, themes, and field suggestions
- chart_type="suggest": Analyzes your data and suggests field mappings (requires data)
Parameters:
- chart_type: chart type ("line", "bar", "pie", etc.) or "help"/"suggest"
- data: list of objects (rows) - optional for help mode
- field_map: keys like x_field, y_field, category_field, value_field, group_field, size_field
- config_overrides: subset of ChartConfig as dict (width, height, title, theme, dpi, etc.)
- options: generator-specific options (e.g., smooth, stack)
- output_format: MCP_IMAGE (PNG), MCP_TEXT (SVG), or MERMAID
|