MCPKG - Model Context Protocol Knowledge Graph
A MCP (Model Context Protocol) server that exposes primitives for interacting with a Knowledge Graph
owulveryck
README
MCPKG - Model Context Protocol Knowledge Graph
MCPKG is a Go implementation of a knowledge graph system that is exposed through the Model Context Protocol (MCP). It provides a simple yet powerful way to store, manage, and query semantic information in the form of subject-predicate-object triples.
Features
- Directed graph implementation for storing structured information
- Support for creating and querying semantic triples
- Persistent storage through serialization
- MCP server interface for programmatic access
- Custom URI format for graph queries
Components
Knowledge Graph (KG)
The core data structure that:
- Stores entities as nodes
- Represents relationships as predicates (edges)
- Provides methods for inserting and querying triples
- Supports serialization and deserialization
MCP Server
An interface layer that:
- Exposes the knowledge graph as an MCP server
- Provides tools for inserting triples
- Supports graph queries via URI format
- Implements a stateless design for reliability
Usage
Inserting Information
Use the insert_triple tool with subject, predicate, and object parameters to add information to the graph.
Querying Information
Use the graph:// URI format to find relationships between entities.
Dependencies
- Go 1.24+
- github.com/mark3labs/mcp-go
- gonum.org/v1/gonum
- github.com/stretchr/testify (for testing)
License
MIT
Recommended Servers
Crypto Price & Market Analysis MCP Server
A Model Context Protocol (MCP) server that provides comprehensive cryptocurrency analysis using the CoinCap API. This server offers real-time price data, market analysis, and historical trends through an easy-to-use interface.
MCP PubMed Search
Server to search PubMed (PubMed is a free, online database that allows users to search for biomedical and life sciences literature). I have created on a day MCP came out but was on vacation, I saw someone post similar server in your DB, but figured to post mine.
dbt Semantic Layer MCP Server
A server that enables querying the dbt Semantic Layer through natural language conversations with Claude Desktop and other AI assistants, allowing users to discover metrics, create queries, analyze data, and visualize results.
mixpanel
Connect to your Mixpanel data. Query events, retention, and funnel data from Mixpanel analytics.
Sequential Thinking MCP Server
This server facilitates structured problem-solving by breaking down complex issues into sequential steps, supporting revisions, and enabling multiple solution paths through full MCP integration.
Nefino MCP Server
Provides large language models with access to news and information about renewable energy projects in Germany, allowing filtering by location, topic (solar, wind, hydrogen), and date range.
Vectorize
Vectorize MCP server for advanced retrieval, Private Deep Research, Anything-to-Markdown file extraction and text chunking.
Mathematica Documentation MCP server
A server that provides access to Mathematica documentation through FastMCP, enabling users to retrieve function documentation and list package symbols from Wolfram Mathematica.
kb-mcp-server
An MCP server aimed to be portable, local, easy and convenient to support semantic/graph based retrieval of txtai "all in one" embeddings database. Any txtai embeddings db in tar.gz form can be loaded
Research MCP Server
The server functions as an MCP server to interact with Notion for retrieving and creating survey data, integrating with the Claude Desktop Client for conducting and reviewing surveys.