Reference server from the Model Context Protocol project.

Stores and retrieves entities and relations in a knowledge graph.

Runs locally, persisting to a file on disk.

When an agent must remember facts across separate sessions.

Gives stateless models durable, queryable long-term memory.

Local disk and any MCP client.

Reference server in the official modelcontextprotocol org. No credentials, no outbound calls; persists a knowledge graph to a local file. Whatever the agent stores is written in plain text.