WORKSPACE KNOWLEDGE / Model Context Protocol steering group
Knowledge Graph Memory reference server
Persist named entities, observations and relations in a local JSONL graph between client sessions.
“A basic implementation of persistent memory using a local knowledge graph.”
01 / THE REASONING
Why this made the selection.
- Keeps a small, inspectable local graph without requiring a vector database or service account.
- Explicit entity, observation and relation tools make memory writes and deletions visible.
02 / THE REVIEW RECORD
What we actually inspected.
Source review has boundaries.
A clear record is more useful than a “safe” badge.
Material inspected
- src/memory/README.md, package.json and index.ts.
- Storage path configuration, graph read/write and delete handlers, resource notifications and stdio startup.
- Repository licence transition.
Our findings
- Writes use a same-directory temporary file and rename, which reduces partial-file replacement risk on POSIX systems.
- The server can remove entities and their relations. Persistence does not verify the truth of a saved observation.
Not established by this review
- Server launch, authenticated tool calls, and release-to-source parity were not tested.
The review applies to the material and revision named here. A newer upstream release can change its behavior.
03 / PUT IT TO WORK
Connect a server deliberately.
DOCUMENTED COMMAND
npx -y @modelcontextprotocol/server-memoryCopying does not execute this command. It may retrieve a newer version than the reviewed source.
- Configure the documented npx command in a stdio client.
- Set MEMORY_FILE_PATH to a persistent file location under your control rather than relying on the package-directory default.
- Review the client’s memory instructions, stored content, backup policy and access permissions.
Before you start
- Node.js and npm/npx.
- A writable directory for the memory file.
Documented configuration example
Use the client and authentication context described in the setup guidance. Configuration formats vary between hosts.
{
"mcpServers": {
"memory": {
"command": "npx",
"args": [
"-y",
"@modelcontextprotocol/server-memory"
],
"env": {
"MEMORY_FILE_PATH": "/path/to/custom/memory.jsonl"
}
}
}
}04 / FOLLOW THE EVIDENCE
The source trail.
Our notes are separate from the original resource.
Check upstream before adopting a new version.
https://raw.githubusercontent.com/modelcontextprotocol/servers/d73f99efbfd40c3aa1b61e88728b3d49fb52608f/src/memory/README.md
Supports: summary, upstreamDescription, whySelected, bestFor, limitations, install, access, compatibility, transports, review
https://raw.githubusercontent.com/modelcontextprotocol/servers/d73f99efbfd40c3aa1b61e88728b3d49fb52608f/README.md
Supports: publisher, upstreamDescription, limitations, review
https://raw.githubusercontent.com/modelcontextprotocol/servers/d73f99efbfd40c3aa1b61e88728b3d49fb52608f/LICENSE
Supports: license, review
https://raw.githubusercontent.com/modelcontextprotocol/servers/d73f99efbfd40c3aa1b61e88728b3d49fb52608f/src/memory/package.json
Supports: language, install
https://raw.githubusercontent.com/modelcontextprotocol/servers/d73f99efbfd40c3aa1b61e88728b3d49fb52608f/src/memory/index.ts
Supports: review, limitations, access, transports