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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/stateless-legacy/client.ts Normal file
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/**
* Connects to the minimal `createMcpHandler` deployment as both a plain 2025
* client (`versionNegotiation: { mode: 'legacy' }` — the `initialize`
* handshake, served stateless from the factory) and a 2026-capable client
* (`versionNegotiation: { mode: 'auto' }`, served per request). Asserts the
* same `greet` tool answers identically either way.
*
* HTTP-only — `createMcpHandler`'s `legacy: 'stateless'` posture is an HTTP
* hosting concern; a stdio leg would bypass it. The story body drives BOTH
* eras itself, so only `url` is read from argv.
*/
import { check, parseExampleArgs } from '@mcp-examples/shared';
import { Client, StreamableHTTPClientTransport } from '@modelcontextprotocol/client';
const { url } = parseExampleArgs();
for (const mode of ['legacy', 'auto'] as const) {
const client = new Client({ name: 'stateless-legacy-client', version: '1.0.0' }, { versionNegotiation: { mode } });
await client.connect(new StreamableHTTPClientTransport(new URL(url)));
const tools = await client.listTools();
check.ok(tools.tools.some(t => t.name === 'greet'));
const result = await client.callTool({ name: 'greet', arguments: { name: 'world' } });
check.equal(result.content?.[0]?.type === 'text' ? result.content[0].text : '', 'Hello, world!');
await client.close();
}