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Add the Letta MCP server to Claude Code

Config last verified Nov 10, 2026

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

Prerequisites

  • Claude Code 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 ~/.claude.json

2. Add this configuration

Add to ~/.claude.json

~/.claude.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>"
      }
    }
  }
}
Or via CLI
bash
claude mcp add letta -- npx -y -p letta-mcp-server letta-mcp

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

Gotchas

Claude Code stores MCP servers under an "mcpServers" object in ~/.claude.json. It also reads a project-scoped .mcp.json and supports adding servers from the command line with "claude mcp add". Each entry must declare either a "type" or a "command"; Claude Code refuses an entry that has neither. Remote servers connect natively over Streamable HTTP with OAuth.

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