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/2026-07-28/schema#missingrequiredclientcapabilityerror
33:	*/
34:	final readonly class MissingRequiredClientCapabilityError extends Error
35:	{
36:	public const string DEFAULT_MESSAGE = 'Missing required client capability';
37:
38:	/**
39:	* @param non-empty-string $message
40:	*/
41:	public function __construct(
42:	public ClientCapabilities $requiredCapabilities,
43:	string $message = self::DEFAULT_MESSAGE,
44:	) {
45:	parent::__construct(
46:	code: ProtocolErrorCode::MissingRequiredClientCapability,
47:	message: $message,
48:	data: ['requiredCapabilities' => $requiredCapabilities->toArray()],
49:	);
50:	}
51:
52:	#[\Override]
53:	public static function fromArray(array $data): static
54:	{
55:	$message = $data['message'] ?? self::DEFAULT_MESSAGE;
56:	Assert::that($message)->isNonEmptyString('error "message" must be a non-empty string, {type} given.');
57:
58:	$payload = $data['data'] ?? null;
59:	Assert::that($payload)
60:	->isArray('error "data" must be an object, {type} given.')
61:	->isMap('error "data" must be a string-keyed object.')
62:	;
63:
64:	Assert::that($payload)->hasOffset('requiredCapabilities', 'error "data" is missing the required "requiredCapabilities" key.');
65:	Assert::that($payload['requiredCapabilities'])
66:	->isArray('error "data.requiredCapabilities" must be an object, {type} given.')
67:	->isMap('error "data.requiredCapabilities" must be a string-keyed object.')
68:	;
69:
70:	return new self(
71:	requiredCapabilities: ClientCapabilities::fromArray($payload['requiredCapabilities']),
72:	message: $message,
73:	);
74:	}
75:
76:	#[\Override]
77:	public function toArray(): array
78:	{
79:	return [
80:	'code' => ProtocolErrorCode::MissingRequiredClientCapability->value,
81:	'message' => $this->message,
82:	'data' => ['requiredCapabilities' => $this->requiredCapabilities->toArray()],
83:	];
84:	}
85:
86:	#[\Override]
87:	public function jsonSerialize(): array
88:	{
89:	return [
90:	'code' => ProtocolErrorCode::MissingRequiredClientCapability->value,
91:	'message' => $this->message,
92:	'data' => ['requiredCapabilities' => $this->requiredCapabilities->jsonSerialize()],
93:	];
94:	}
95:	}
96:

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