Memory MCP

open sourcestdio

Persistent knowledge graph memory for AI agents across sessions

Updated 2026-03-01

MemoryFree· Open source, self-hosted. Stores data in a local JSON file.GitHub Docs

Official MCP server that gives AI agents a persistent, long-term memory store backed by a knowledge graph. Agents can create entities and relationships, store observations, and recall facts from previous sessions, enabling truly stateful AI agents that remember context over time.

Install

npx -y @modelcontextprotocol/server-memory

Runtime: node

Tools (9)

create_entities

Create multiple new entities in the knowledge graph

entities

create_relations

Create multiple new relations between entities in the knowledge graph

relations

add_observations

Add new observations to existing entities in the knowledge graph

observations

delete_entities

Delete multiple entities and their associated relations from the knowledge graph

entityNames

delete_observations

Delete specific observations from entities in the knowledge graph

deletions

delete_relations

Delete multiple relations from the knowledge graph

relations

read_graph

Read the entire knowledge graph

search_nodes

Search for nodes in the knowledge graph based on a query

query

open_nodes

Open specific nodes in the knowledge graph by their names

names

Use Cases

·Build agents that remember users and preferences across sessions
·Enable agents to track project state and decisions over time
·Create personal assistant agents with long-term context
·Store and retrieve entity relationships for complex domains

Key Points

•Knowledge graph model, entities, relations, and observations stored persistently
•Agents can read, write, search, and delete from the graph
•Stored in a local JSONL file, easy to inspect and back up
•Official Anthropic-maintained server, the standard for agent memory

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Machine-Readable

This MCP is available as structured JSON via the API.

GET /api/v1/mcps/memory