Comunica
๐ฌ A knowledge graph querying framework for JavaScript
What is Comunica?
Comunica is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to ๐ฌ a knowledge graph querying framework for javascript
๐ฌ A knowledge graph querying framework for JavaScript
This server falls under the Search & Data Extraction category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- ๐ฌ A knowledge graph querying framework for JavaScript
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx comunicaConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use Comunica
Comunica is a modular knowledge graph querying framework for JavaScript that provides MCP server wrappers enabling AI agents to execute SPARQL queries over decentralized RDF data sources โ including web-based linked data, local RDF files, HDT archives, and Solid data pods. The comunica-feature-mcp package exposes six specialized query engines as MCP tools, letting AI assistants answer questions grounded in structured semantic data rather than relying solely on training knowledge. It is particularly suited for teams working with linked data, Wikidata, DBpedia, or Solid-based personal data vaults.
Prerequisites
- Node.js 8.0 or later installed
- Yarn package manager (npm is not supported for this monorepo)
- Familiarity with SPARQL query syntax and RDF data sources
- An MCP-compatible client such as Claude Desktop
Install the Comunica SPARQL MCP server via npx
The quickest way to run the Comunica MCP SPARQL server is directly through npx in stdio mode, which is compatible with standard MCP clients like Claude Desktop.
npx -y @comunica/mcp-sparql --mode stdioExplore the six available MCP servers
Comunica provides six specialized query engines as separate MCP packages. Choose the one that matches your data source: web RDF, local files, HDT, Solid pods, link traversal, or link traversal over Solid.
# Web-based decentralized RDF
npx -y @comunica/mcp-sparql
# Local RDF files
npx -y @comunica/mcp-sparql-file
# Solid data pods
npx -y @comunica/mcp-sparql-solid
# Link traversal across RDF documents
npx -y @comunica/mcp-sparql-link-traversalClone the monorepo for development or custom engines
For customizing query engines or contributing, clone the comunica-feature-mcp monorepo and install with Yarn.
git clone https://github.com/comunica/comunica-feature-mcp.git
cd comunica-feature-mcp
yarn installConfigure your MCP client
Add the Comunica SPARQL server to your claude_desktop_config.json. The server runs in stdio mode and requires no API keys for public linked data sources.
Test with a SPARQL query against public data
After connecting, ask the AI to query a public RDF endpoint such as Wikidata or DBpedia to verify the connection is working.
Comunica Examples
Client configuration
Add this to your claude_desktop_config.json to enable Comunica SPARQL querying for web-based decentralized RDF knowledge graphs. No API key is required for public data sources.
{
"mcpServers": {
"comunica-sparql": {
"command": "npx",
"args": [
"-y",
"@comunica/mcp-sparql",
"--mode",
"stdio"
]
}
}
}Prompts to try
Use these prompts to query knowledge graphs through the Comunica SPARQL MCP server.
- "What movies did both Brad Pitt and Leonardo DiCaprio appear in? Query Wikidata."
- "What is the population of the largest cities in Canada according to DBpedia?"
- "What are the proteins associated with Alzheimer's disease in biomedical RDF datasets?"
- "Query my Solid pod for events scheduled this week."
- "What are Ruben Taelman's main research interests according to his FOAF profile?"Troubleshooting Comunica
SPARQL query times out for large datasets
Add a LIMIT clause to your SPARQL queries to restrict result size. For large federated queries across multiple endpoints, consider using the link traversal engine only when necessary as it can be slower.
npm install fails with workspace dependency errors
Comunica's monorepo requires Yarn, not npm. Run `npm install -g yarn` then use `yarn install` instead. Using npm will fail due to workspace configuration.
Solid pod queries fail with authentication errors
The @comunica/mcp-sparql-solid engine requires Solid authentication credentials. Refer to the Comunica Solid documentation at comunica.dev/docs/query/advanced/solid/ for configuring WebID-based authentication.
Frequently Asked Questions about Comunica
What is Comunica?
Comunica is a Model Context Protocol (MCP) server that ๐ฌ a knowledge graph querying framework for javascript It connects AI assistants to external tools and data sources through a standardized interface.
How do I install Comunica?
Follow the installation instructions on the Comunica GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with Comunica?
Comunica works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is Comunica free to use?
Yes, Comunica is open source and available under the NOASSERTION license. You can use it freely in both personal and commercial projects.
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Set Up Comunica in Your Editor
Choose your AI client for step-by-step setup instructions.
Quick Config Preview
Add this to your claude_desktop_config.json or .cursor/mcp.json
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