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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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27
examples/custom-version/client.ts Normal file
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/**
* Initializes with a protocol version the server lists in
* `supportedProtocolVersions` (and one it does not, to assert the fallback).
*/
import { check, parseExampleArgs, siblingPath } from '@mcp-examples/shared';
import { Client, StreamableHTTPClientTransport } from '@modelcontextprotocol/client';
import { StdioClientTransport } from '@modelcontextprotocol/client/stdio';
const { transport, url } = parseExampleArgs();
// A plain (2025-handshake) client; the server supports the SDK's stock
// 2025 version so this negotiates that.
const client = new Client({ name: 'custom-version-example-client', version: '1.0.0' }, { versionNegotiation: { mode: '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))));
// The server should advertise its supportedProtocolVersions in its
// tool's text payload.
const result = await client.callTool({ name: 'get-protocol-info' });
const text = result.content?.[0]?.type === 'text' ? result.content[0].text : '{}';
const info = JSON.parse(text) as { supportedVersions: string[] };
check.ok(info.supportedVersions.includes('2026-01-01'));
check.ok(info.supportedVersions.length > 1);
await client.close();