doobidoo/mcp-memory-service

With over 1,600 stars, the project has significant traction and fills a critical gap in the agentic ecosystem (persistent cross-session memory). By combining standard vector-based memory with structured knowledge graphs and the emerging MCP standard, it offers a sophisticated middleware layer. However, memory and 'state' are high-priority features for frontier labs; OpenAI and Anthropic are likely to release official memory solutions that could Sherlock this tool if they achieve better native integration.