{
  "slug": "memory-reference",
  "name": "Memory (reference)",
  "author": "MCP steering group",
  "category": "Reference servers",
  "tier": "checkable",
  "kind": "stdio",
  "packageSpec": "npm:@modelcontextprotocol/server-memory@2.0.1",
  "sourceUrl": "https://github.com/modelcontextprotocol/servers/tree/main/src/memory",
  "repoUrl": "https://github.com/modelcontextprotocol/servers",
  "enrichment": {},
  "current": {
    "verdict": "alive",
    "reason": "all_passed",
    "failedChecks": [],
    "untestedTools": 6,
    "checkedAt": "2026-10-29T06:47:54.585Z",
    "methodologyVersion": "1.0.0",
    "serverVersion": "2.0.1",
    "checks": [
      {
        "id": "L0.reachable",
        "detail": "http undefined",
        "status": "pass",
        "durationMs": 3918
      },
      {
        "id": "L0.tls",
        "status": "skipped"
      },
      {
        "id": "L0.initialize",
        "status": "pass",
        "evidence": {
          "raw": "{\"result\":{\"protocolVersion\":\"2025-11-25\",\"capabilities\":{\"tools\":{\"listChanged\":true},\"resources\":{\"listChanged\":true,\"subscribe\":true}},\"serverInfo\":{\"name\":\"memory-server\",\"version\":\"2.0.1\"}},\"jsonrpc\":\"2.0\",\"id\":1}"
        },
        "durationMs": 3918
      },
      {
        "id": "L0.protocol_version",
        "detail": "server reported \"2025-11-25\"; published versions: 2024-11-05, 2025-03-26, 2025-06-18, 2025-11-25",
        "status": "pass"
      },
      {
        "id": "L0.capabilities",
        "detail": "tools, resources",
        "status": "pass"
      },
      {
        "id": "L1.server_info",
        "detail": "memory-server 2.0.1",
        "status": "pass"
      },
      {
        "id": "L1.tools_list",
        "detail": "9 tools",
        "status": "pass"
      },
      {
        "id": "L1.tool_schemas",
        "detail": "9 schemas valid",
        "status": "pass"
      },
      {
        "id": "L1.resources_list",
        "detail": "1 entries",
        "status": "pass"
      },
      {
        "id": "L1.prompts_list",
        "detail": "prompts capability not declared",
        "status": "skipped"
      },
      {
        "id": "L1.unknown_method",
        "status": "pass",
        "evidence": {
          "raw": "{\"jsonrpc\":\"2.0\",\"id\":4,\"error\":{\"code\":-32601,\"message\":\"Method not found\"}}"
        },
        "durationMs": 2
      },
      {
        "id": "L1.envelope",
        "detail": "4 replies valid",
        "status": "pass"
      },
      {
        "id": "L2.call_ok",
        "tool": "add_observations",
        "detail": "mutation_name",
        "status": "untested"
      },
      {
        "id": "L2.call_ok",
        "tool": "create_entities",
        "detail": "mutation_name",
        "status": "untested"
      },
      {
        "id": "L2.call_ok",
        "tool": "create_relations",
        "detail": "mutation_name",
        "status": "untested"
      },
      {
        "id": "L2.call_ok",
        "tool": "delete_entities",
        "detail": "mutation_name",
        "status": "untested"
      },
      {
        "id": "L2.call_ok",
        "tool": "delete_observations",
        "detail": "mutation_name",
        "status": "untested"
      },
      {
        "id": "L2.call_ok",
        "tool": "delete_relations",
        "detail": "mutation_name",
        "status": "untested"
      },
      {
        "id": "L2.call_ok",
        "tool": "open_nodes",
        "status": "pass",
        "evidence": {
          "raw": "{\"result\":{\"content\":[{\"type\":\"text\",\"text\":\"{\\n  \\\"entities\\\": [],\\n  \\\"relations\\\": []\\n}\"}],\"structuredContent\":{\"entities\":[],\"relations\":[]}},\"jsonrpc\":\"2.0\",\"id\":5}",
          "arguments": {
            "names": []
          }
        },
        "durationMs": 4
      },
      {
        "id": "L2.output_schema",
        "tool": "open_nodes",
        "status": "pass"
      },
      {
        "id": "L2.bad_input",
        "tool": "open_nodes",
        "status": "pass",
        "evidence": {
          "raw": "{\"result\":{\"content\":[{\"type\":\"text\",\"text\":\"Input validation error: Invalid arguments for tool open_nodes: names: Invalid input: expected array, received undefined\"}],\"isError\":true},\"jsonrpc\":\"2.0\",\"id\":6}",
          "arguments": {}
        },
        "durationMs": 2
      },
      {
        "id": "L2.call_ok",
        "tool": "read_graph",
        "status": "pass",
        "evidence": {
          "raw": "{\"result\":{\"content\":[{\"type\":\"text\",\"text\":\"{\\n  \\\"entities\\\": [],\\n  \\\"relations\\\": []\\n}\"}],\"structuredContent\":{\"entities\":[],\"relations\":[]}},\"jsonrpc\":\"2.0\",\"id\":7}",
          "arguments": {}
        },
        "durationMs": 3
      },
      {
        "id": "L2.output_schema",
        "tool": "read_graph",
        "status": "pass"
      },
      {
        "id": "L2.bad_input",
        "tool": "read_graph",
        "detail": "no schema violation can be crafted",
        "status": "skipped"
      },
      {
        "id": "L2.call_ok",
        "tool": "search_nodes",
        "status": "pass",
        "evidence": {
          "raw": "{\"result\":{\"content\":[{\"type\":\"text\",\"text\":\"{\\n  \\\"entities\\\": [],\\n  \\\"relations\\\": []\\n}\"}],\"structuredContent\":{\"entities\":[],\"relations\":[]}},\"jsonrpc\":\"2.0\",\"id\":8}",
          "arguments": {
            "query": "knot-verified-probe"
          }
        },
        "durationMs": 3
      },
      {
        "id": "L2.output_schema",
        "tool": "search_nodes",
        "status": "pass"
      },
      {
        "id": "L2.bad_input",
        "tool": "search_nodes",
        "status": "pass",
        "evidence": {
          "raw": "{\"result\":{\"content\":[{\"type\":\"text\",\"text\":\"Input validation error: Invalid arguments for tool search_nodes: query: Invalid input: expected string, received undefined\"}],\"isError\":true},\"jsonrpc\":\"2.0\",\"id\":9}",
          "arguments": {}
        },
        "durationMs": 2
      },
      {
        "id": "L2.timeout",
        "detail": "3 calls answered within 30000 ms",
        "status": "pass"
      }
    ],
    "metrics": {
      "callMs": [
        4,
        2,
        3,
        3,
        2
      ],
      "toolsListMs": 9,
      "initializeMs": 3918
    },
    "facts": {
      "authModel": "none",
      "transport": "stdio",
      "capabilities": [
        "resources",
        "tools"
      ],
      "toolAnnotations": {
        "readOnly": 3,
        "unmarked": 3,
        "destructive": 3
      },
      "credentialsInUrl": false
    }
  },
  "l3": {
    "uptime": {
      "24h": null,
      "7d": 1,
      "30d": 1
    },
    "sampleSize": {
      "24h": 0,
      "7d": 1,
      "30d": 1
    },
    "latency": {
      "initialize": {
        "p50": null,
        "p95": null
      },
      "calls": {
        "p50": 3,
        "p95": 4
      }
    },
    "flakiness": null,
    "versionDrift": []
  },
  "history": [
    {
      "startedAt": "2026-10-29T06:47:50.566Z",
      "runKind": "full",
      "l0Ok": true,
      "verdict": "alive"
    }
  ]
}