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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>
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Felix Weinberger 2026-06-26 14:01:10 +01:00 • committed by GitHub
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examples/parallel-calls/client.ts Normal file
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/**
* Two clients in parallel, each calling the notification-emitting tool, and
* one client making two parallel tool calls — asserts every result returns
* and that notifications were attributed back to the right caller.
*
* Over HTTP every client connects to the one running endpoint; over stdio
* each `makeClient` spawns its own server process (so the
* "multiple clients" leg is per-process, while the "one client / parallel
* calls" leg exercises one server's per-call attribution either way).
*/
import { check, parseExampleArgs, siblingPath } from '@mcp-examples/shared';
import { Client, StreamableHTTPClientTransport } from '@modelcontextprotocol/client';
import { StdioClientTransport } from '@modelcontextprotocol/client/stdio';
async function makeClient(): Promise<{ client: Client; notifications: string[] }> {
const { transport, url, era } = parseExampleArgs();
const client = new Client(
{ name: 'parallel-calls-example-client', version: '1.0.0' },
{ versionNegotiation: { mode: era === 'modern' ? 'auto' : 'legacy' } }
);
await (transport === 'stdio'
? client.connect(new StdioClientTransport({ command: 'npx', args: ['-y', 'tsx', siblingPath(import.meta.url, 'server.ts')] }))
: client.connect(new StreamableHTTPClientTransport(new URL(url))));
const notifications: string[] = [];
client.setNotificationHandler('notifications/message', n => {
notifications.push(String(n.params.data));
});
return { client, notifications };
}
// --- multiple clients, one call each ---
const [a, b] = await Promise.all([makeClient(), makeClient()]);
const [ra, rb] = await Promise.all([
a.client.callTool({ name: 'start-notification-stream', arguments: { caller: 'A', count: 3 } }),
b.client.callTool({ name: 'start-notification-stream', arguments: { caller: 'B', count: 3 } })
]);
check.match(ra.content?.[0]?.type === 'text' ? ra.content[0].text : '', /\[A\] done/);
check.match(rb.content?.[0]?.type === 'text' ? rb.content[0].text : '', /\[B\] done/);
check.ok(a.notifications.every(m => m.includes('[A]')));
check.ok(b.notifications.every(m => m.includes('[B]')));
check.ok(a.notifications.length >= 3 && b.notifications.length >= 3);
await a.client.close();
await b.client.close();
// --- one client, parallel tool calls ---
const c = await makeClient();
const results = await Promise.all([
c.client.callTool({ name: 'start-notification-stream', arguments: { caller: 'C1', count: 2 } }),
c.client.callTool({ name: 'start-notification-stream', arguments: { caller: 'C2', count: 2 } })
]);
check.equal(results.length, 2);
check.ok(c.notifications.some(m => m.includes('[C1]')) && c.notifications.some(m => m.includes('[C2]')));
await c.client.close();