Implement MCP 2026-07-28 (#2286)

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>

examples/prompts/server.ts

@@ -0,0 +1,54 @@
+/**
+ * Prompts primitive + completion.
+ *
+ * Register prompts with `McpServer.registerPrompt`; wrap an arg schema with
+ * `completable(...)` so the client's `complete()` call returns suggestions.
+ * One binary, either transport.
+ */
+import { createServer } from 'node:http';
+
+import { parseExampleArgs } from '@mcp-examples/shared';
+import { toNodeHandler } from '@modelcontextprotocol/node';
+import { completable, createMcpHandler, McpServer } from '@modelcontextprotocol/server';
+import { serveStdio } from '@modelcontextprotocol/server/stdio';
+import * as z from 'zod/v4';
+
+const LANGUAGES = ['python', 'typescript', 'rust', 'go'];
+
+function buildServer(): McpServer {
+    const server = new McpServer({ name: 'prompts-example', version: '1.0.0' });
+
+    server.registerPrompt(
+        'review-code',
+        {
+            title: 'Code review',
+            description: 'Review code for quality and idioms',
+            argsSchema: z.object({
+                language: completable(z.string().describe('Programming language'), value => LANGUAGES.filter(l => l.startsWith(value))),
+                code: z.string().describe('The code to review')
+            })
+        },
+        async ({ language, code }) => ({
+            messages: [
+                {
+                    role: 'user',
+                    content: { type: 'text', text: `Review this ${language} code for quality and idioms:\n\n${code}` }
+                }
+            ]
+        })
+    );
+
+    return server;
+}
+
+const { transport, port } = parseExampleArgs();
+
+if (transport === 'stdio') {
+    void serveStdio(buildServer);
+    console.error('[server] serving over stdio');
+} else {
+    const handler = createMcpHandler(buildServer);
+    createServer(toNodeHandler(handler)).listen(port, () => {
+        console.error(`[server] listening on http://127.0.0.1:${port}/mcp`);
+    });
+}