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Implement MCP 2026-07-28 (#2286)

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Co-authored-by: Matt <77928207+mattzcarey@users.noreply.github.com>
Co-authored-by: Konstantin Konstantinov <KKonstantinov@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
This commit is contained in:
Felix Weinberger 2026-06-26 14:01:10 +01:00 • committed by GitHub
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49
examples/gateway/server.ts Normal file
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/**
* Gateway / distributed-client target server. A plain 2026-era MCP server with
* a couple of tools and a `request_count` instrumentation tool that returns how
* many requests have reached this process — `createMcpHandler` builds one
* server instance per inbound request, so the module-level counter equals the
* number of MCP requests served (server/discover, tools/call, …). The client
* asserts against it to PROVE that `connect({ prior })` sent nothing.
*/
import { createServer } from 'node:http';
import { parseExampleArgs } from '@mcp-examples/shared';
import { toNodeHandler } from '@modelcontextprotocol/node';
import { createMcpHandler, McpServer } from '@modelcontextprotocol/server';
import * as z from 'zod/v4';
let requestCount = 0;
function buildServer(): McpServer {
requestCount++;
const server = new McpServer({ name: 'gateway-target', version: '1.0.0' });
server.registerTool('echo', { description: 'Echo the input back', inputSchema: z.object({ text: z.string() }) }, async ({ text }) => ({
content: [{ type: 'text', text }]
}));
server.registerTool('uppercase', { inputSchema: z.object({ text: z.string() }) }, async ({ text }) => ({
content: [{ type: 'text', text: text.toUpperCase() }]
}));
// Exposes the process-wide request count so the client can assert exactly
// which round trips happened. The factory increment for THIS call has
// already run by the time the handler executes, so the returned value
// includes the request_count call itself.
server.registerTool('request_count', { description: 'Number of MCP requests this server process has received' }, async () => ({
content: [{ type: 'text', text: String(requestCount) }]
}));
return server;
}
// HTTP-only — the request_count proof depends on `createMcpHandler`'s
// per-request factory; on stdio the factory is per-connection and the 2/3/7
// assertions would not hold.
const { port } = parseExampleArgs();
const handler = createMcpHandler(buildServer);
createServer(toNodeHandler(handler)).listen(port, () => {
console.error(`[server] listening on http://127.0.0.1:${port}/mcp`);
});