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Add the Letta MCP server to Claude Desktop

Config last verified Nov 10, 2026

The exact config to run Letta in Claude Desktop — paste it in, restart, and the tools load.

Prerequisites

  • Claude Desktop installed.
  • LETTA_BASE_URL — URL of the Letta server's API, for example http://localhost:8283.
  • LETTA_PASSWORD — Letta server password. LETTA_API_TOKEN is accepted instead when LETTA_PASSWORD is unset.

Setup

1. Open ~/Library/Application Support/Claude/claude_desktop_config.json

On Windows the file lives at %APPDATA%\Claude\claude_desktop_config.json.

2. Add this configuration

Add to ~/Library/Application Support/Claude/claude_desktop_config.json

~/Library/Application Support/Claude/claude_desktop_config.json
json
{
  "mcpServers": {
    "letta": {
      "command": "npx",
      "args": [
        "-y",
        "-p",
        "letta-mcp-server",
        "letta-mcp"
      ],
      "env": {
        "LETTA_BASE_URL": "<LETTA_BASE_URL>",
        "LETTA_PASSWORD": "<LETTA_PASSWORD>"
      }
    }
  }
}

3. Restart Claude Desktop and confirm the Letta tools load.

Gotchas

Claude Desktop reads MCP servers from an "mcpServers" object, but the config file is stdio-only: it cannot dial a remote URL directly. To reach a remote server you bridge it locally by running "npx mcp-remote <url>" as the command. Native remote Connectors exist on paid plans, but not through this config file, so the bridge is the portable path.

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