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Best MCP Servers for Memory & Knowledge Graphs
Retrieval, RAG, and long-term-memory MCP servers that give agents a persistent knowledge layer - vector databases, document indexes, and knowledge-graph platforms like Chroma, Milvus, Graphlit, and Needle. We audit each for how it handles retrieved untrusted content and stored sensitive data. Ranked by CheckMCP audit grade.
4 servers, ranked by independent MCP Score. Click any to see its full security & quality audit.
| 01 | graphlit-mcp-server graphlit/graphlit-mcp-server | ◆ repo★ 375 | 81B |
| 02 | mcp-server-milvus zilliztech/mcp-server-milvus | ◆ repo★ 233 | 77C |
| 03 | needle-mcp needle-ai/needle-mcp | ◆ repo★ 100 | 67D |
| 04 | chroma-mcp chroma-core/chroma-mcp | ◆ repo★ 569 | 63D |
Best MCP Servers for Memory & Knowledge Graphs — FAQ
What is the best MCP Servers for Memory & Knowledge Graphs MCP server?+
By CheckMCP's audit, graphlit-mcp-server ranks highest in "Best MCP Servers for Memory & Knowledge Graphs" with an MCP Score of 81/100 (grade B). This page ranks 4 audited MCP servers by their vendor-neutral CheckMCP score (security, tool design, reliability, context-cost). Re-audit any of them at checkmcp.dev.
How are these MCP servers ranked?+
Every server on this page is independently audited by CheckMCP and scored 0–100 across weighted pillars — for live endpoints: security (OWASP MCP Top 10), tool design, schemas, reliability and context-cost; for repos: maintenance, license, adoption and documentation. Higher score = higher rank. No vendor pays for placement.
Are these MCP servers safe to use?+
Each listing links to a full CheckMCP report showing its grade, per-pillar breakdown and any security findings (tool poisoning, hardcoded secrets, the lethal trifecta). Grade A/B servers passed with no or only minor issues; check the individual report before connecting any server to sensitive data or tools.