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Rudof MCP Server

A Model Context Protocol server for RDF validation, querying, and data transformation

Overview

rudof_mcp exposes the Rudof library to any MCP-compatible AI client. It supports Shape Expressions (ShEx), SHACL, SPARQL, and multiple RDF serialization formats, making it straightforward to integrate semantic web operations into AI workflows.

What You Can Do

Load RDF data — From URLs, local files, raw text, or SPARQL endpoints
Validate — Against ShEx and SHACL schemas
Query — Execute SPARQL SELECT, CONSTRUCT, ASK, and DESCRIBE
Inspect — Explore outgoing/incoming arcs for any RDF node
Visualize — Generate PlantUML diagrams and SVG/PNG images
Export — Serialize data to Turtle, N-Triples, RDF/XML, JSON-LD, and more

Quick Start

Claude Desktop (Stdio)

In Claude Desktop’s configuration file, add the following entry:

{
  "mcpServers": {
    "rudof": {
        "command": "/path/to/rudof.exe",
        "args": [ "mcp" ],
        "env": {
            "PLANTUML": "/path/to/plantuml.jar"
        },
        "enabled": true
    }
  }
}

⚠️ Visualization support: The export_image tool require PlantUML. To enable them:

Download plantuml.jar and place it at a fixed path (e.g. C:\ProgramData\PlantUML\plantuml.jar).

Set the PLANTUML environment variable in the env block above to point to that path.

HTTP Client

To run the MCP server with streamable-http transport on port 8080 under the route rdf, allowing connections from localhost and a local network:

rudof mcp --transport streamable-http --bind 0.0.0.0 --port 8080 --route rdf --allowed-network 127.0.0.1 --allowed-network 192.168.1.0/24

💡 Docker: The server persists loaded RDF data across ephemeral container restarts by saving state to /app/state/data.json. Mount a Docker volume at /app/state/ to preserve data between runs. Override the path with the RUDOF_MCP_STATE_PATH environment variable.

Transport Types

Stdio

For CLI tools, IDE extensions (VS Code, IntelliJ, etc.), and Docker
The MCP client spawns the server as a subprocess
Communication via stdin/stdout using JSON-RPC

Streamable HTTP

For web clients and multi-client deployments
JSON-RPC over HTTP POST with Server-Sent Events (SSE) for streaming
Session management via the MCP-Session-Id header
Origin header validation and configurable IP allowlist for security
CORS support via tower-http

MCP Capabilities

Capability	Description
Tools	10 tools for validation, querying, and data operations
Prompts	Guided templates for common validation workflows
Resources	Current RDF data exposed in multiple formats
Resource Templates	URI template for accessing RDF data in any supported format
Logging	MCP `notifications/message` with RFC 5424 level filtering
Completions	Argument completions for prompts and resources

Tools

Data Management

Tool	Description
`load_rdf_data_from_sources`	Load RDF data from URLs, files, raw text, or SPARQL endpoints
`export_rdf_data`	Serialize RDF data to Turtle, N-Triples, RDF/XML, JSON-LD, etc.
`export_plantuml`	Generate a PlantUML diagram of the RDF graph
`export_image`	Generate an SVG or PNG visualization

Node Inspection

Tool	Description
`node_info`	Show outgoing and incoming arcs for an RDF node

SPARQL

Tool	Description
`execute_sparql_query`	Execute SELECT, CONSTRUCT, ASK, or DESCRIBE queries

ShEx

Tool	Description
`validate_shex`	Validate the loaded RDF data against a ShEx schema
`check_shex`	Check whether a ShEx schema is syntactically well-formed
`show_shex`	Parse and display a ShEx schema with optional analysis

SHACL

Tool	Description
`validate_shacl`	Validate the loaded RDF data against a SHACL schema

Prompts

Prompt	Description
`explore_rdf_node`	Guide for exploring RDF node relationships
`analyze_rdf_data`	Comprehensive data structure and quality analysis
`validation_guide`	Step-by-step ShEx/SHACL validation workflow

Resources

Data

URI	Description
`rudof://current-data`	Currently loaded RDF data in Turtle format

Resource Templates

URI Template	Description
`rudof://current-data/{format}`	Currently loaded RDF data in the specified format. `{format}` must be one of: `turtle`, `ntriples`, `rdfxml`, `jsonld`, `trig`, `nquads`, `n3`

Format Metadata

URI	Description
`rudof://formats/rdf`	Supported RDF serialization formats
`rudof://formats/node-modes`	Available node inspection modes
`rudof://formats/query-types`	Supported SPARQL query types
`rudof://formats/query-results`	Supported SPARQL result formats
`rudof://formats/shex`	Supported ShEx formats
`rudof://formats/shex-validation-result`	ShEx validation result formats
`rudof://formats/validation-reader-modes`	Reader modes (strict/lax)
`rudof://formats/shex-validation-sort-options`	Sort options for ShEx results
`rudof://formats/shacl`	Supported SHACL formats
`rudof://formats/shacl-validation-result`	SHACL validation result formats
`rudof://formats/shacl-validation-sort-options`	Sort options for SHACL results

Security

The HTTP transport enforces:

Origin validation — Requests with invalid Origin headers return 403 Forbidden
Protocol version validation — Invalid MCP protocol versions return 400 Bad Request
IP allowlist — Requests from non-allowed networks are rejected
Session management — Sessions can be terminated via HTTP DELETE

Dependencies

Crate	Role
`rudof_lib`	Core RDF engine (ShEx, SHACL, SPARQL)
`rmcp`	Rust MCP SDK — protocol and macro infrastructure
`axum`	HTTP server for Streamable HTTP transport
`tokio`	Async runtime
`ipnetwork`	IP/CIDR parsing for the network allowlist

For more information about the Model Context Protocol, visit the official MCP documentation.

rudof_mcp 0.2.13