chore(mcp): minor cleanup of types and package.json

Author: stainless-app[bot]

packages/mcp-server/package.json

@@ -42,6 +42,7 @@
   "devDependencies": {
     "@types/jest": "^29.4.0",
     "@types/express": "^5.0.3",
+    "@types/yargs": "^17.0.8",
     "@typescript-eslint/eslint-plugin": "8.31.1",
     "@typescript-eslint/parser": "8.31.1",
     "eslint": "^8.49.0",

packages/mcp-server/src/http.ts

@@ -69,7 +69,7 @@ const del = async (req: express.Request, res: express.Response) => {
   });
 };
 
-export const streamableHTTPApp = (options: McpOptions) => {
+export const streamableHTTPApp = (options: McpOptions): express.Express => {
   const app = express();
   app.use(express.json());