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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>
This commit is contained in:
Felix Weinberger 2026-06-26 14:01:10 +01:00 • committed by GitHub
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55
examples/client/src/simpleTokenProvider.ts
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#!/usr/bin/env node
/**
* Example demonstrating the minimal AuthProvider for bearer token authentication.
*
* AuthProvider is the base interface for all client auth. For simple cases where
* tokens are managed externally — pre-configured API tokens, gateway/proxy patterns,
* or tokens obtained through a separate auth flow — implement only `token()`.
*
* For OAuth flows (client_credentials, private_key_jwt, etc.), use the built-in
* providers which implement both `token()` and `onUnauthorized()`.
*
* Environment variables:
* MCP_SERVER_URL - Server URL (default: http://localhost:3000/mcp)
* MCP_TOKEN - Bearer token to use for authentication (required)
*/
import type { AuthProvider } from '@modelcontextprotocol/client';
import { Client, StreamableHTTPClientTransport } from '@modelcontextprotocol/client';
const DEFAULT_SERVER_URL = process.env.MCP_SERVER_URL || 'http://localhost:3000/mcp';
async function main() {
const token = process.env.MCP_TOKEN;
if (!token) {
console.error('MCP_TOKEN environment variable is required');
process.exit(1);
}
// AuthProvider with just token() — the simplest possible auth.
// token() is called before every request, so it can handle refresh internally.
// With no onUnauthorized(), a 401 throws UnauthorizedError immediately.
const authProvider: AuthProvider = {
token: async () => token
};
const client = new Client({ name: 'auth-provider-example', version: '1.0.0' }, { capabilities: {} });
const transport = new StreamableHTTPClientTransport(new URL(DEFAULT_SERVER_URL), { authProvider });
await client.connect(transport);
console.log('Connected successfully.');
const tools = await client.listTools();
console.log('Available tools:', tools.tools.map(t => t.name).join(', ') || '(none)');
await transport.close();
}
try {
await main();
} catch (error) {
console.error('Error running client:', error);
process.exitCode = 1;
}