ontolocy/ontolocy-mcp-server
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The Ontolocy MCP Server is a proof of concept server designed to enhance a Language Model (LLM) with Ontolocy cyber graph capabilities using a combination of Neo4j, MCP Python SDK, and other technologies.
Ontolocy MCP Server
Simple proof of concept MCP server to augment an LLM with Ontolocy cyber graph capabilities.
Key technologies:
- Neo4j - for the graph database
- MCP Python SDK - for the MCP server
- PydanticAI - for the client (which connects to the MCP server)
- Neontology - Interacting with Neo4j using pydantic models
- Ontolocy - Cyber graph ontology and tooling built with Neontology
Quickstart
Pre-Requisites
Install dependencies with uv:
uv sync
Make sure you have a .env file which specifies:
FASTMCP_PORT=8008
OPENAI_API_KEY=<YOUR API KEY>
NEO4J_URI="neo4j://localhost:7687"
NEO4J_USERNAME=neo4j
NEO4J_PASSWORD=<YOUR NEO4J PASSWORD>
Ensure your Neo4j database is running and accessible. Be warned, the LLM may run arbitrary queries against it!
Populate the Graph
Use Ontolocy to populate the graph with MITRE ATT&CK data from the official github repo.
uv run ontolocy parse mitre-attack
Start the Server
uv run server.py
This will make the MCP server available on the port configured in the .env file (e.g.8008).
Use the CLI Client
uv run mcp_sse_client.py lookup mitre attack technique T1090 in the ontolocy cyber graph