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Knowledge Graph Memory

Model Context Protocol maintainers

stdio9 documented tools156

About Knowledge Graph Memory

An official local memory server that persists entities, relations, and observations as a knowledge graph in a JSONL file and exposes graph operations through MCP tools and a resource.

What you can use it for

  • Persist named entities and factual observations
  • Create or inspect relations between people, organizations, events, and concepts
  • Search a graph and open selected nodes across conversations
Connection and setup
Hosting
Local
Transport
stdio
Endpoint
Local process; no hosted endpoint documented
Authentication
No external account or credential is documented; graph data is stored locally in the configured memory file.

Requirements

  • Node.js/npm for npx setup or Docker for the documented container option
  • MCP-compatible client
  • Writable location for MEMORY_FILE_PATH if customized

Setup steps

  1. Configure command npx with args [-y, @modelcontextprotocol/server-memory]. On Windows the maintainers document using cmd /c npx.
  2. Optionally set MEMORY_FILE_PATH to an absolute JSONL path so data survives package/client changes and is easy to back up. The default path is inside the server package directory.
  3. Reload the client. Verify with read_graph, which is read-only and does not change stored data.
  4. The server also publishes the knowledge-graph resource at memory://knowledge-graph; clients can subscribe to updates.
Tools 9

The official README and current implementation document these nine tools plus a separate knowledge-graph resource. Delete tools remove graph entities, observations, or relations.

  • create_entities
    01
  • create_relations
    02
  • add_observations
    03
  • delete_entities
    04
  • delete_observations
    05
  • delete_relations
    06
  • read_graph
    07
  • search_nodes
    08
  • open_nodes
    09
Limitations and notes
  • Data is local to the configured file; sharing one file across clients requires a writable local filesystem and the project's locking behavior.
  • Memory content may be sensitive; secure the file and backups appropriately.
  • Delete tools can permanently remove stored graph information.
Original sources
  • official tool reference

    Official maintainer README and implementation document nine tools and a knowledge-graph resource.

  • official documentation

    Official maintainer README and implementation document nine tools and a knowledge-graph resource.

Documentation checked 2026-10-28T12:35:00.000Z. Connection has not been runtime tested.

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