## Update Mcp Server

`client.mcpServers.update(stringmcpServerID, McpServerUpdateParamsbody, RequestOptionsoptions?): McpServerUpdateResponse`

**patch** `/v1/mcp-servers/{mcp_server_id}`

Update an existing MCP server configuration

### Parameters

- `mcpServerID: string`

- `body: McpServerUpdateParams`

  - `config: UpdateStdioMcpServer | UpdateSseMcpServer | UpdateStreamableHTTPMcpServer`

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

    - `UpdateStdioMcpServer`

      Update schema for Stdio MCP server - all fields optional

      - `args: Array<string> | null`

        The arguments to pass to the command

      - `command: string | null`

        The command to run (MCP 'local' client will run this command)

      - `env?: Record<string, string> | null`

        Environment variables to set

      - `mcp_server_type?: "stdio"`

        - `"stdio"`

    - `UpdateSseMcpServer`

      Update schema for SSE MCP server - all fields optional

      - `server_url: string | null`

        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"`

        - `"sse"`

    - `UpdateStreamableHTTPMcpServer`

      Update schema for Streamable HTTP MCP server - all fields optional

      - `server_url: string | null`

        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"`

        - `"streamable_http"`

  - `server_name?: string | null`

    The name of the MCP server

### Returns

- `McpServerUpdateResponse = StdioMcpServer | SseMcpServer | StreamableHTTPMcpServer`

  A Stdio MCP server

  - `StdioMcpServer`

    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"`

      - `"stdio"`

  - `SseMcpServer`

    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"`

      - `"sse"`

  - `StreamableHTTPMcpServer`

    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"`

      - `"streamable_http"`

### Example

```typescript
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.update('mcp_server_id', {
  config: {
    args: ['string'],
    command: 'command',
    mcp_server_type: 'stdio',
  },
});

console.log(mcpServer);
```

#### Response

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