Add optional stdio transport to marketing example servers

When launched with --stdio flag, servers use StdioServerTransport
instead of starting an HTTP server. This enables direct integration
with Claude Desktop and other MCP clients that use stdio transport.

Usage:
  bun examples/budget-allocator-server/server.ts --stdio

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

examples/budget-allocator-server/server.ts

@@ -5,6 +5,7 @@
  * and industry benchmarks by company stage.
  */
 import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
 import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
 import type {
   CallToolResult,
@@ -292,9 +293,15 @@ server.registerResource(
 );
 
 // ---------------------------------------------------------------------------
-// Express Server
+// Server Startup
 // ---------------------------------------------------------------------------
 
+async function main() {
+  if (process.argv.includes("--stdio")) {
+    const transport = new StdioServerTransport();
+    await server.connect(transport);
+    console.error("Budget Allocator Server running in stdio mode");
+  } else {
     const app = express();
     app.use(cors());
     app.use(express.json());
@@ -339,3 +346,7 @@ function shutdown() {
 
     process.on("SIGINT", shutdown);
     process.on("SIGTERM", shutdown);
+  }
+}
+
+main().catch(console.error);

examples/cohort-heatmap-server/server.ts

@@ -1,4 +1,5 @@
 import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
 import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
 import type { ReadResourceResult } from "@modelcontextprotocol/sdk/types.js";
 import cors from "cors";
@@ -204,6 +205,12 @@ const server = new McpServer({
   );
 }
 
+async function main() {
+  if (process.argv.includes("--stdio")) {
+    const transport = new StdioServerTransport();
+    await server.connect(transport);
+    console.error("Cohort Heatmap Server running in stdio mode");
+  } else {
     const app = express();
     app.use(cors());
     app.use(express.json());
@@ -234,7 +241,7 @@ app.post("/mcp", async (req: Request, res: Response) => {
     });
 
     const httpServer = app.listen(PORT, () => {
-  console.log(`Server listening on http://localhost:${PORT}/mcp`);
+      console.log(`Cohort Heatmap Server listening on http://localhost:${PORT}/mcp`);
     });
 
     function shutdown() {
@@ -247,3 +254,7 @@ function shutdown() {
 
     process.on("SIGINT", shutdown);
     process.on("SIGTERM", shutdown);
+  }
+}
+
+main().catch(console.error);

examples/customer-segmentation-server/server.ts

@@ -1,4 +1,5 @@
 import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
 import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
 import type {
   CallToolResult,
@@ -103,6 +104,12 @@ const server = new McpServer({
   );
 }
 
+async function main() {
+  if (process.argv.includes("--stdio")) {
+    const transport = new StdioServerTransport();
+    await server.connect(transport);
+    console.error("Customer Segmentation Server running in stdio mode");
+  } else {
     const app = express();
     app.use(cors());
     app.use(express.json());
@@ -148,3 +155,7 @@ function shutdown() {
 
     process.on("SIGINT", shutdown);
     process.on("SIGTERM", shutdown);
+  }
+}
+
+main().catch(console.error);

examples/scenario-modeler-server/server.ts

@@ -1,4 +1,5 @@
 import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
 import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
 import type {
   CallToolResult,
@@ -308,9 +309,15 @@ const server = new McpServer({
 }
 
 // ============================================================================
-// Express Server
+// Server Startup
 // ============================================================================
 
+async function main() {
+  if (process.argv.includes("--stdio")) {
+    const transport = new StdioServerTransport();
+    await server.connect(transport);
+    console.error("SaaS Scenario Modeler Server running in stdio mode");
+  } else {
     const app = express();
     app.use(cors());
     app.use(express.json());
@@ -355,3 +362,7 @@ function shutdown() {
 
     process.on("SIGINT", shutdown);
     process.on("SIGTERM", shutdown);
+  }
+}
+
+main().catch(console.error);

examples/system-monitor-server/server.ts

@@ -1,4 +1,5 @@
 import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
 import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
 import type {
   CallToolResult,
@@ -175,6 +176,12 @@ const server = new McpServer({
   );
 }
 
+async function main() {
+  if (process.argv.includes("--stdio")) {
+    const transport = new StdioServerTransport();
+    await server.connect(transport);
+    console.error("System Monitor Server running in stdio mode");
+  } else {
     const app = express();
     app.use(cors());
     app.use(express.json());
@@ -220,3 +227,7 @@ function shutdown() {
 
     process.on("SIGINT", shutdown);
     process.on("SIGTERM", shutdown);
+  }
+}
+
+main().catch(console.error);