File Core/Schema/Error/MissingRequiredClientCapabilityError.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\Error;
15:
16:	use Nexus\Assert\Assert;
17:	use Nexus\Mcp\Core\Schema\Arrayable;
18:	use Nexus\Mcp\Core\Schema\ClientCapabilities;
19:	use Nexus\Mcp\Core\Schema\Enum\ProtocolErrorCode;
20:	use Nexus\Mcp\Core\Schema\Error;
21:
22:	/**
23:	* Returned when processing a request requires a capability the client did not declare in
24:	* `clientCapabilities`. For HTTP, the response status code MUST be `400 Bad Request`.
25:	*
26:	* @extends Error<array{
27:	* code: -32021,
28:	* message: non-empty-string,
29:	* data: array{requiredCapabilities: template-type<ClientCapabilities, Arrayable, 'T'>},
30:	* }>
31:	*
32:	* @see https://modelcontextprotocol.io/specification/draft/schema#missingrequiredclientcapabilityerror
33:	*/
34:	final readonly class MissingRequiredClientCapabilityError extends Error
35:	{
36:	public const string DEFAULT_MESSAGE = 'Missing required client capability';
37:
38:	public function __construct(public ClientCapabilities $requiredCapabilities, string $message = self::DEFAULT_MESSAGE)
39:	{
40:	parent::__construct(
41:	code: ProtocolErrorCode::MissingRequiredClientCapability,
42:	message: $message,
43:	data: ['requiredCapabilities' => $requiredCapabilities->toArray()],
44:	);
45:	}
46:
47:	#[\Override]
48:	public static function fromArray(array $data): static
49:	{
50:	$message = $data['message'] ?? self::DEFAULT_MESSAGE;
51:	Assert::that($message)->isString('error "message" must be a string, {type} given.');
52:
53:	$payload = $data['data'] ?? null;
54:	Assert::that($payload)
55:	->isArray('error "data" must be an object, {type} given.')
56:	->isMap('error "data" must be a string-keyed object.')
57:	;
58:
59:	Assert::that($payload)->hasOffset('requiredCapabilities', 'error "data" is missing the required "requiredCapabilities" key.');
60:	Assert::that($payload['requiredCapabilities'])
61:	->isArray('error "data.requiredCapabilities" must be an object, {type} given.')
62:	->isMap('error "data.requiredCapabilities" must be a string-keyed object.')
63:	;
64:
65:	return new self(
66:	requiredCapabilities: ClientCapabilities::fromArray($payload['requiredCapabilities']),
67:	message: $message,
68:	);
69:	}
70:
71:	#[\Override]
72:	public function toArray(): array
73:	{
74:	return [
75:	'code' => ProtocolErrorCode::MissingRequiredClientCapability->value,
76:	'message' => $this->message,
77:	'data' => ['requiredCapabilities' => $this->requiredCapabilities->toArray()],
78:	];
79:	}
80:
81:	#[\Override]
82:	public function jsonSerialize(): array
83:	{
84:	return [
85:	'code' => ProtocolErrorCode::MissingRequiredClientCapability->value,
86:	'message' => $this->message,
87:	'data' => ['requiredCapabilities' => $this->requiredCapabilities->jsonSerialize()],
88:	];
89:	}
90:	}
91:

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