Official Anthropic MCP reference server for knowledge graph memory. Build and query a persistent knowledge base of entities, observations, and relationships. Create nodes, add observations, define typed relationships between entities, and search the graph. Install via npm: @modelcontextprotocol/server-memory
https://github.com/modelcontextprotocol/servers/tree/main/src/memory
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Weaviate MCP server for AI-native vector databases. Semantic and hybrid search, multi-modal retrieval, generative search, and knowledge graph operations. Supports multi-tenancy and real-time data ingestion.
https://github.com/weaviate/mcp-server-weaviate
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Registered 2026-02-17