feat(mcp): add unix socket option for remote MCP

Author: stainless-app[bot]

packages/mcp-server/src/http.ts

@@ -83,7 +83,7 @@ export const streamableHTTPApp = (options: McpOptions) => {
 export const launchStreamableHTTPServer = async (
   options: McpOptions,
   endpoints: Endpoint[],
-  port: number | undefined,
+  port: number | string | undefined,
 ) => {
   const app = streamableHTTPApp(options);
   const server = app.listen(port);

packages/mcp-server/src/index.ts

@@ -26,7 +26,7 @@ async function main() {
       await launchStdioServer(options, selectedTools);
       break;
     case 'http':
-      await launchStreamableHTTPServer(options, selectedTools, options.port);
+      await launchStreamableHTTPServer(options, selectedTools, options.port ?? options.socket);
       break;
   }
 }

packages/mcp-server/src/options.ts

@@ -7,6 +7,7 @@ export type CLIOptions = McpOptions & {
   list: boolean;
   transport: 'stdio' | 'http';
   port: number | undefined;
+  socket: string | undefined;
 };
 
 export type McpOptions = {
@@ -141,6 +142,10 @@ export function parseOptions(): CLIOptions {
       type: 'number',
       description: 'Port to serve on if using http transport',
     })
+    .option('socket', {
+      type: 'string',
+      description: 'Unix socket to serve on if using http transport',
+    })
     .help();
 
   for (const [command, desc] of examples()) {
@@ -262,6 +267,7 @@ export function parseOptions(): CLIOptions {
     list: argv.list || false,
     transport,
     port: argv.port,
+    socket: argv.socket,
   };
 }
 

packages/mcp-server/src/server.ts

@@ -67,7 +67,6 @@ export function init(params: {
   const logAtLevel =
     (level: 'debug' | 'info' | 'warning' | 'error') =>
     (message: string, ...rest: unknown[]) => {
-      console.error(message, ...rest);
       void server.sendLoggingMessage({
         level,
         data: { message, rest },