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Add the Letta MCP server to Cursor

Config last verified Nov 10, 2026

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

Prerequisites

  • Cursor 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 ~/.cursor/mcp.json

2. Add this configuration

Add to ~/.cursor/mcp.json

~/.cursor/mcp.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 Cursor and confirm the Letta tools load.

Gotchas

Cursor keeps MCP servers under an "mcpServers" object in ~/.cursor/mcp.json for global use, and also reads a project-scoped .cursor/mcp.json so a repository can ship its own servers. Remote servers are configured with a bare "url" field and connect natively, with OAuth handled in-app when a server requires it.

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