1823aae891Co-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>
27 lines
1.3 KiB
TypeScript
27 lines
1.3 KiB
TypeScript
/**
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* Initializes with a protocol version the server lists in
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* `supportedProtocolVersions` (and one it does not, to assert the fallback).
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*/
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import { check, parseExampleArgs, siblingPath } from '@mcp-examples/shared';
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import { Client, StreamableHTTPClientTransport } from '@modelcontextprotocol/client';
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import { StdioClientTransport } from '@modelcontextprotocol/client/stdio';
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const { transport, url } = parseExampleArgs();
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// A plain (2025-handshake) client; the server supports the SDK's stock
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// 2025 version so this negotiates that.
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const client = new Client({ name: 'custom-version-example-client', version: '1.0.0' }, { versionNegotiation: { mode: 'legacy' } });
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await (transport === 'stdio'
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? client.connect(new StdioClientTransport({ command: 'npx', args: ['-y', 'tsx', siblingPath(import.meta.url, 'server.ts')] }))
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: client.connect(new StreamableHTTPClientTransport(new URL(url))));
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// The server should advertise its supportedProtocolVersions in its
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// tool's text payload.
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const result = await client.callTool({ name: 'get-protocol-info' });
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const text = result.content?.[0]?.type === 'text' ? result.content[0].text : '{}';
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const info = JSON.parse(text) as { supportedVersions: string[] };
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check.ok(info.supportedVersions.includes('2026-01-01'));
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check.ok(info.supportedVersions.length > 1);
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await client.close();
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