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refactor(examples): migrate 6 servers to use shared server utility
Refactored the following example servers to use the shared startServer utility from examples/shared/server-utils.ts: - threejs-server - system-monitor-server - cohort-heatmap-server - budget-allocator-server - customer-segmentation-server - scenario-modeler-server Changes for each server: - Removed direct imports: SSEServerTransport, StdioServerTransport, StreamableHTTPServerTransport, cors, express - Removed PORT constant (now handled by shared utility) - Added import for startServer from ../shared/server-utils.js - Replaced entire async main() function with single startServer() call - Preserved all business logic (tool registration, resource registration, helper functions) This reduces code duplication by ~700 lines and ensures consistent transport handling across all example servers. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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‎examples/budget-allocator-server/server.ts‎

Lines changed: 2 additions & 85 deletions
Original file line numberDiff line numberDiff line change
@@ -5,21 +5,16 @@
55
* and industry benchmarks by company stage.
66
*/
77
import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
8-
import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
9-
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
10-
import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
118
import type {
129
CallToolResult,
1310
ReadResourceResult,
1411
} from "@modelcontextprotocol/sdk/types.js";
15-
import cors from "cors";
16-
import express, { type Request, type Response } from "express";
1712
import fs from "node:fs/promises";
1813
import path from "node:path";
1914
import { z } from "zod";
2015
import { RESOURCE_MIME_TYPE, RESOURCE_URI_META_KEY } from "../../dist/src/app";
16+
import { startServer } from "../shared/server-utils.js";
2117

22-
const PORT = process.env.PORT ? parseInt(process.env.PORT, 10) : 3001;
2318
const DIST_DIR = path.join(import.meta.dirname, "dist");
2419

2520
// ---------------------------------------------------------------------------
@@ -297,82 +292,4 @@ server.registerResource(
297292
// Server Startup
298293
// ---------------------------------------------------------------------------
299294

300-
async function main() {
301-
if (process.argv.includes("--stdio")) {
302-
const transport = new StdioServerTransport();
303-
await server.connect(transport);
304-
console.error("Budget Allocator Server running in stdio mode");
305-
} else {
306-
const app = express();
307-
app.use(cors());
308-
app.use(express.json());
309-
310-
// Streamable HTTP transport (current spec) - handles GET, POST, DELETE
311-
app.all("/mcp", async (req: Request, res: Response) => {
312-
try {
313-
const transport = new StreamableHTTPServerTransport({
314-
sessionIdGenerator: undefined,
315-
enableJsonResponse: true,
316-
});
317-
res.on("close", () => {
318-
transport.close();
319-
});
320-
321-
await server.connect(transport);
322-
await transport.handleRequest(req, res, req.body);
323-
} catch (error) {
324-
console.error("Error handling MCP request:", error);
325-
if (!res.headersSent) {
326-
res.status(500).json({
327-
jsonrpc: "2.0",
328-
error: { code: -32603, message: "Internal server error" },
329-
id: null,
330-
});
331-
}
332-
}
333-
});
334-
335-
// Legacy SSE transport (deprecated) - for backwards compatibility
336-
const sseTransports = new Map<string, SSEServerTransport>();
337-
338-
app.get("/sse", async (_req: Request, res: Response) => {
339-
const transport = new SSEServerTransport("/messages", res);
340-
sseTransports.set(transport.sessionId, transport);
341-
res.on("close", () => { sseTransports.delete(transport.sessionId); });
342-
await server.connect(transport);
343-
});
344-
345-
app.post("/messages", async (req: Request, res: Response) => {
346-
const sessionId = req.query.sessionId as string;
347-
const transport = sseTransports.get(sessionId);
348-
if (!transport) {
349-
res.status(404).json({ error: "Session not found" });
350-
return;
351-
}
352-
await transport.handlePostMessage(req, res, req.body);
353-
});
354-
355-
const httpServer = app.listen(PORT, (err) => {
356-
if (err) {
357-
console.error("Error starting server:", err);
358-
process.exit(1);
359-
}
360-
console.log(
361-
`Budget Allocator Server listening on http://localhost:${PORT}/mcp`,
362-
);
363-
});
364-
365-
function shutdown() {
366-
console.log("\nShutting down...");
367-
httpServer.close(() => {
368-
console.log("Server closed");
369-
process.exit(0);
370-
});
371-
}
372-
373-
process.on("SIGINT", shutdown);
374-
process.on("SIGTERM", shutdown);
375-
}
376-
}
377-
378-
main().catch(console.error);
295+
startServer(server, { name: "Budget Allocator Server" });

‎examples/cohort-heatmap-server/server.ts‎

Lines changed: 2 additions & 86 deletions
Original file line numberDiff line numberDiff line change
@@ -1,16 +1,11 @@
11
import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
2-
import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
3-
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
4-
import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
52
import type { ReadResourceResult } from "@modelcontextprotocol/sdk/types.js";
6-
import cors from "cors";
7-
import express, { type Request, type Response } from "express";
83
import fs from "node:fs/promises";
94
import path from "node:path";
105
import { z } from "zod";
116
import { RESOURCE_MIME_TYPE, RESOURCE_URI_META_KEY } from "../../dist/src/app";
7+
import { startServer } from "../shared/server-utils.js";
128

13-
const PORT = process.env.PORT ? parseInt(process.env.PORT, 10) : 3001;
149
const DIST_DIR = path.join(import.meta.dirname, "dist");
1510

1611
// Schemas - types are derived from these using z.infer
@@ -206,83 +201,4 @@ const server = new McpServer({
206201
);
207202
}
208203

209-
async function main() {
210-
if (process.argv.includes("--stdio")) {
211-
const transport = new StdioServerTransport();
212-
await server.connect(transport);
213-
console.error("Cohort Heatmap Server running in stdio mode");
214-
} else {
215-
const app = express();
216-
app.use(cors());
217-
app.use(express.json());
218-
219-
// Streamable HTTP transport (current spec) - handles GET, POST, DELETE
220-
app.all("/mcp", async (req: Request, res: Response) => {
221-
try {
222-
const transport = new StreamableHTTPServerTransport({
223-
sessionIdGenerator: undefined,
224-
enableJsonResponse: true,
225-
});
226-
res.on("close", () => {
227-
transport.close();
228-
});
229-
230-
await server.connect(transport);
231-
232-
await transport.handleRequest(req, res, req.body);
233-
} catch (error) {
234-
console.error("Error handling MCP request:", error);
235-
if (!res.headersSent) {
236-
res.status(500).json({
237-
jsonrpc: "2.0",
238-
error: { code: -32603, message: "Internal server error" },
239-
id: null,
240-
});
241-
}
242-
}
243-
});
244-
245-
// Legacy SSE transport (deprecated) - for backwards compatibility
246-
const sseTransports = new Map<string, SSEServerTransport>();
247-
248-
app.get("/sse", async (_req: Request, res: Response) => {
249-
const transport = new SSEServerTransport("/messages", res);
250-
sseTransports.set(transport.sessionId, transport);
251-
res.on("close", () => { sseTransports.delete(transport.sessionId); });
252-
await server.connect(transport);
253-
});
254-
255-
app.post("/messages", async (req: Request, res: Response) => {
256-
const sessionId = req.query.sessionId as string;
257-
const transport = sseTransports.get(sessionId);
258-
if (!transport) {
259-
res.status(404).json({ error: "Session not found" });
260-
return;
261-
}
262-
await transport.handlePostMessage(req, res, req.body);
263-
});
264-
265-
const httpServer = app.listen(PORT, (err) => {
266-
if (err) {
267-
console.error("Error starting server:", err);
268-
process.exit(1);
269-
}
270-
console.log(
271-
`Cohort Heatmap Server listening on http://localhost:${PORT}/mcp`,
272-
);
273-
});
274-
275-
function shutdown() {
276-
console.log("\nShutting down...");
277-
httpServer.close(() => {
278-
console.log("Server closed");
279-
process.exit(0);
280-
});
281-
}
282-
283-
process.on("SIGINT", shutdown);
284-
process.on("SIGTERM", shutdown);
285-
}
286-
}
287-
288-
main().catch(console.error);
204+
startServer(server, { name: "Cohort Heatmap Server" });

‎examples/customer-segmentation-server/server.ts‎

Lines changed: 2 additions & 86 deletions
Original file line numberDiff line numberDiff line change
@@ -1,24 +1,19 @@
11
import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
2-
import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
3-
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
4-
import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
52
import type {
63
CallToolResult,
74
ReadResourceResult,
85
} from "@modelcontextprotocol/sdk/types.js";
9-
import cors from "cors";
10-
import express, { type Request, type Response } from "express";
116
import fs from "node:fs/promises";
127
import path from "node:path";
138
import { z } from "zod";
149
import { RESOURCE_MIME_TYPE, RESOURCE_URI_META_KEY } from "../../dist/src/app";
10+
import { startServer } from "../shared/server-utils.js";
1511
import {
1612
generateCustomers,
1713
generateSegmentSummaries,
1814
} from "./src/data-generator.ts";
1915
import { SEGMENTS, type Customer, type SegmentSummary } from "./src/types.ts";
2016

21-
const PORT = process.env.PORT ? parseInt(process.env.PORT, 10) : 3001;
2217
const DIST_DIR = path.join(import.meta.dirname, "dist");
2318

2419
// Schemas - types are derived from these using z.infer
@@ -105,83 +100,4 @@ const server = new McpServer({
105100
);
106101
}
107102

108-
async function main() {
109-
if (process.argv.includes("--stdio")) {
110-
const transport = new StdioServerTransport();
111-
await server.connect(transport);
112-
console.error("Customer Segmentation Server running in stdio mode");
113-
} else {
114-
const app = express();
115-
app.use(cors());
116-
app.use(express.json());
117-
118-
// Streamable HTTP transport (current spec) - handles GET, POST, DELETE
119-
app.all("/mcp", async (req: Request, res: Response) => {
120-
try {
121-
const transport = new StreamableHTTPServerTransport({
122-
sessionIdGenerator: undefined,
123-
enableJsonResponse: true,
124-
});
125-
res.on("close", () => {
126-
transport.close();
127-
});
128-
129-
await server.connect(transport);
130-
131-
await transport.handleRequest(req, res, req.body);
132-
} catch (error) {
133-
console.error("Error handling MCP request:", error);
134-
if (!res.headersSent) {
135-
res.status(500).json({
136-
jsonrpc: "2.0",
137-
error: { code: -32603, message: "Internal server error" },
138-
id: null,
139-
});
140-
}
141-
}
142-
});
143-
144-
// Legacy SSE transport (deprecated) - for backwards compatibility
145-
const sseTransports = new Map<string, SSEServerTransport>();
146-
147-
app.get("/sse", async (_req: Request, res: Response) => {
148-
const transport = new SSEServerTransport("/messages", res);
149-
sseTransports.set(transport.sessionId, transport);
150-
res.on("close", () => { sseTransports.delete(transport.sessionId); });
151-
await server.connect(transport);
152-
});
153-
154-
app.post("/messages", async (req: Request, res: Response) => {
155-
const sessionId = req.query.sessionId as string;
156-
const transport = sseTransports.get(sessionId);
157-
if (!transport) {
158-
res.status(404).json({ error: "Session not found" });
159-
return;
160-
}
161-
await transport.handlePostMessage(req, res, req.body);
162-
});
163-
164-
const httpServer = app.listen(PORT, (err) => {
165-
if (err) {
166-
console.error("Error starting server:", err);
167-
process.exit(1);
168-
}
169-
console.log(
170-
`Customer Segmentation Server listening on http://localhost:${PORT}/mcp`,
171-
);
172-
});
173-
174-
function shutdown() {
175-
console.log("\nShutting down...");
176-
httpServer.close(() => {
177-
console.log("Server closed");
178-
process.exit(0);
179-
});
180-
}
181-
182-
process.on("SIGINT", shutdown);
183-
process.on("SIGTERM", shutdown);
184-
}
185-
}
186-
187-
main().catch(console.error);
103+
startServer(server, { name: "Customer Segmentation Server" });

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