36 lines
1.5 KiB
TypeScript
36 lines
1.5 KiB
TypeScript
/**
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* Connects to `./server.ts` and asserts the `com.example/feature-flags`
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* extension capability and its settings are advertised on both the legacy
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* (`--legacy`, 2025 `initialize`) and modern (`server/discover`) legs.
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*
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* Spawns the sibling `server.ts` over stdio by default, or connects to a
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* running endpoint under `--http <url>`. See `examples/CONTRIBUTING.md` for
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* the canonical shape.
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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, era } = parseExampleArgs();
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const client = new Client(
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{ name: 'extension-capabilities-example-client', version: '1.0.0' },
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{ versionNegotiation: { mode: era === 'modern' ? 'auto' : 'legacy' } }
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);
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await client.connect(
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transport === 'stdio'
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? new StdioClientTransport({ command: 'npx', args: ['-y', 'tsx', siblingPath(import.meta.url, 'server.ts')] })
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: new StreamableHTTPClientTransport(new URL(url))
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);
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// Read the negotiated extension map after connecting.
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const extensions = client.getServerCapabilities()?.extensions ?? {};
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console.log(
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`[client] ${era} leg (${client.getNegotiatedProtocolVersion()}) advertised extensions: ${Object.keys(extensions).join(', ') || '(none)'}`
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);
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check.ok('com.example/feature-flags' in extensions);
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check.deepEqual(extensions['com.example/feature-flags'], { flags: ['dark-mode', 'beta-search'] });
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await client.close();
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