File Client/Exception/UnsupportedProtocolVersionException.php

1:	<?php
2:
3:	declare(strict_types=1);
4:
5:	/**
6:	* This file is part of the Nexus MCP SDK package.
7:	*
8:	* (c) 2026 John Paul E. Balandan, CPA <paulbalandan@gmail.com>
9:	*
10:	* For the full copyright and license information, please view
11:	* the LICENSE file that was distributed with this source code.
12:	*/
13:
14:	namespace Nexus\Mcp\Client\Exception;
15:
16:	use Nexus\Mcp\Core\Exception\McpExceptionInterface;
17:	use Nexus\Mcp\Core\Schema\ProtocolVersion;
18:
19:	/**
20:	* Thrown when the server's `initialize` response advertises a protocol version
21:	* this client does not support, aborting the handshake before it is confirmed.
22:	*/
23:	final class UnsupportedProtocolVersionException extends \RuntimeException implements McpExceptionInterface
24:	{
25:	public function __construct(public readonly ProtocolVersion $negotiated)
26:	{
27:	parent::__construct(\sprintf(
28:	'Server responded with unsupported protocol version "%s". This client supports "%s".',
29:	$negotiated->version,
30:	ProtocolVersion::LATEST_VERSION,
31:	));
32:	}
33:	}
34: