Lean Memory vs Memory Arbiter MCP

In-depth architectural comparison of the Lean Memory and Memory Arbiter MCP MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Lean Memory when:

• You need dedicated capabilities in the Knowledge & Memory domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• You have access to required keys: LM_DATA_ROOT, ANTHROPIC_API_KEY.
• Primary tools included: Single SQLite file per namespace for isolated memory storage, Hybrid dense (embedding) and sparse (FTS5) search retrieval, Add-only memory history with point-in-time querying.

Explore Lean Memory Details

Choose Memory Arbiter MCP when:

• You need dedicated capabilities in the Knowledge & Memory domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• You have access to required keys: .

Feature & Specification Comparison

Specification	Lean Memory Wuesteon Knowledge & Memory	Memory Arbiter MCP billy12151 Knowledge & Memory
Summary
Category & Scope	Knowledge & Memory	Knowledge & Memory

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "wuesteon-lean-memory": {
      "command": "uvx",
      "args": [
        "lean-memory"
      ],
      "env": {
        "LM_DATA_ROOT": "YOUR_LM_DATA_ROOT_HERE",
        "ANTHROPIC_API_KEY": "YOUR_ANTHROPIC_API_KEY_HERE"
      }
    }
  }
}

{
  "mcpServers": {
    "billy12151-memory-arbiter-mcp": {
      "url": "http://127.0.0.1:8000/mcp"
    }
  }
}

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