File Core/Schema/Request/DiscoverRequest.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\Core\Schema\Request;
15:
16:	use Nexus\Assert\Assert;
17:	use Nexus\Mcp\Core\Schema\JsonRpc\JsonRpcRequest;
18:	use Nexus\Mcp\Core\Schema\RequestId;
19:	use Nexus\Mcp\Core\Schema\RequestParams;
20:	use Nexus\Mcp\Core\Schema\RequestParams\EmptyRequestParams;
21:
22:	/**
23:	* A request from the client asking the server to advertise its supported
24:	* protocol versions, capabilities, and other metadata. Servers MUST
25:	* implement `server/discover`. Clients MAY call it but are not required
26:	* to — version negotiation can also happen inline via per-request `_meta`.
27:	*
28:	* @property-read EmptyRequestParams $params
29:	*
30:	* @extends JsonRpcRequest<'server/discover', array{
31:	* jsonrpc: '2.0',
32:	* id: int\|non-empty-string,
33:	* method: 'server/discover',
34:	* params: template-type<EmptyRequestParams, RequestParams, 'T'>,
35:	* }>
36:	*
37:	* @see https://modelcontextprotocol.io/specification/draft/schema#discoverrequest
38:	*/
39:	final readonly class DiscoverRequest extends JsonRpcRequest implements ClientRequest
40:	{
41:	public function __construct(RequestId $id, EmptyRequestParams $params)
42:	{
43:	parent::__construct(id: $id, params: $params);
44:	}
45:
46:	#[\Override]
47:	public static function getMethod(): string
48:	{
49:	return 'server/discover';
50:	}
51:
52:	#[\Override]
53:	public static function fromArray(array $data): static
54:	{
55:	Assert::that($data)->hasOffset('id', 'missing the required "id" key.');
56:	$id = $data['id'];
57:	Assert::that($id)->isArrayKey('"id" must be an int or string, {type} given.');
58:
59:	Assert::that($data)->hasOffset('params', 'missing the required "params" key.');
60:	Assert::that($data['params'])
61:	->isArray('"params" must be an object, {type} given.')
62:	->isMap('"params" must be a string-keyed object.')
63:	;
64:	$params = EmptyRequestParams::fromArray($data['params']);
65:
66:	return new self(id: new RequestId(id: $id), params: $params);
67:	}
68:
69:	#[\Override]
70:	public function toArray(): array
71:	{
72:	return [
73:	'jsonrpc' => self::JSONRPC_VERSION,
74:	'id' => $this->id->id,
75:	'method' => static::getMethod(),
76:	'params' => $this->params->toArray(),
77:	];
78:	}
79:	}
80:

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