Add the Letta MCP server to VS Code

Prerequisites

• VS 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

{
  "servers": {
    "letta": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "-p",
        "letta-mcp-server",
        "letta-mcp"
      ],
      "env": {
        "LETTA_BASE_URL": "<LETTA_BASE_URL>",
        "LETTA_PASSWORD": "<LETTA_PASSWORD>"
      }
    }
  }
}

Gotchas

• VS Code uses the `servers` key (not `mcpServers`) and requires `type`.

VS Code is the exception to every other client: its top-level key is "servers", not "mcpServers", and each entry needs an explicit "type" (for example "http" or "stdio"). Secrets are not inlined; instead you declare an "inputs" array and reference each value as ${input:id}, so VS Code prompts for it once and never writes it to disk. Remote servers connect natively with OAuth.