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Memory MCP Server

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Reference MCP server implementing a knowledge-graph persistent memory.

open source free https://github.com/modelcontextprotocol/servers/tree/main/src/memory ↗ repo ↗ 
Official reference memory server using a simple knowledge-graph model (entities, relations, observations). Lower-friction than mem0/letta/zep for prototypes; less feature-rich for production.

Strengths

  • Official reference implementation
  • No external service
  • Knowledge-graph model

Tradeoffs

  • No managed hosting
  • Single-tenant

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