Create Mcp Server

client.mcpServers.create(, ?): McpServerCreateResponse

POST/v1/mcp-servers/

Add a new MCP server to the Letta MCP server config

ParametersExpand Collapse

body: McpServerCreateParams { config, server_name }

config: CreateStdioMcpServer { args, command, env, mcp_server_type } | CreateSseMcpServer { server_url, auth_header, auth_token, 2 more } | CreateStreamableHTTPMcpServer { server_url, auth_header, auth_token, 2 more }

The MCP server configuration (Stdio, SSE, or Streamable HTTP)

One of the following:

CreateStdioMcpServer { args, command, env, mcp_server_type }

Create a new Stdio MCP server

args: Array<string>

The arguments to pass to the command

command: string

The command to run (MCP ‘local’ client will run this command)

env?: Record<string, string> | null

Environment variables to set

mcp_server_type?: "stdio"

CreateSseMcpServer { server_url, auth_header, auth_token, 2 more }

Create a new SSE MCP server

server_url: string

The URL of the server

auth_header?: string | null

The name of the authentication header (e.g., ‘Authorization’)

auth_token?: string | null

The authentication token or API key value

custom_headers?: Record<string, string> | null

Custom HTTP headers to include with requests

mcp_server_type?: "sse"

CreateStreamableHTTPMcpServer { server_url, auth_header, auth_token, 2 more }

Create a new Streamable HTTP MCP server

server_url: string

The URL of the server

auth_header?: string | null

The name of the authentication header (e.g., ‘Authorization’)

auth_token?: string | null

The authentication token or API key value

custom_headers?: Record<string, string> | null

Custom HTTP headers to include with requests

mcp_server_type?: "streamable_http"

server_name: string

The name of the MCP server

ReturnsExpand Collapse

McpServerCreateResponse = StdioMcpServer { args, command, server_name, 3 more } | SseMcpServer { server_name, server_url, id, 4 more } | StreamableHTTPMcpServer { server_name, server_url, id, 4 more }

A Stdio MCP server

One of the following:

StdioMcpServer { args, command, server_name, 3 more }

A Stdio MCP server

args: Array<string>

The arguments to pass to the command

command: string

The command to run (MCP ‘local’ client will run this command)

server_name: string

The name of the MCP server

id?: string

The human-friendly ID of the Mcp_server

env?: Record<string, string> | null

Environment variables to set

mcp_server_type?: "stdio"

SseMcpServer { server_name, server_url, id, 4 more }

An SSE MCP server

server_name: string

The name of the MCP server

server_url: string

The URL of the server

id?: string

The human-friendly ID of the Mcp_server

auth_header?: string | null

The name of the authentication header (e.g., ‘Authorization’)

auth_token?: string | null

The authentication token or API key value

custom_headers?: Record<string, string> | null

Custom HTTP headers to include with requests

mcp_server_type?: "sse"

StreamableHTTPMcpServer { server_name, server_url, id, 4 more }

A Streamable HTTP MCP server

server_name: string

The name of the MCP server

server_url: string

The URL of the server

id?: string

The human-friendly ID of the Mcp_server

auth_header?: string | null

The name of the authentication header (e.g., ‘Authorization’)

auth_token?: string | null

The authentication token or API key value

custom_headers?: Record<string, string> | null

Custom HTTP headers to include with requests

mcp_server_type?: "streamable_http"

Create Mcp Server

import Letta from '@letta-ai/letta-client';

const client = new Letta({
  apiKey: process.env['LETTA_API_KEY'], // This is the default and can be omitted
});

const mcpServer = await client.mcpServers.create({
  config: {
    args: ['string'],
    command: 'command',
    mcp_server_type: 'stdio',
  },
  server_name: 'server_name',
});

console.log(mcpServer);

{
  "args": [
    "string"
  ],
  "command": "command",
  "server_name": "server_name",
  "id": "mcp_server-123e4567-e89b-12d3-a456-426614174000",
  "env": {
    "foo": "string"
  },
  "mcp_server_type": "stdio"
}

Returns Examples

{
  "args": [
    "string"
  ],
  "command": "command",
  "server_name": "server_name",
  "id": "mcp_server-123e4567-e89b-12d3-a456-426614174000",
  "env": {
    "foo": "string"
  },
  "mcp_server_type": "stdio"
}