File Core/Schema/Error/MethodNotFoundError.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\Enum\ProtocolErrorCode;
18:	use Nexus\Mcp\Core\Schema\Error;
19:
20:	/**
21:	* A JSON-RPC error indicating that the requested method does not exist or is not available.
22:	*
23:	* In MCP, a server returns this error when a client invokes a method the server does not
24:	* implement — either a genuinely unknown method, or one gated behind a server capability the
25:	* server did not advertise (e.g., calling `prompts/list` when the `prompts` capability was not
26:	* advertised).
27:	*
28:	* A request that requires a client capability the client did not declare is signalled instead
29:	* by `MissingRequiredClientCapabilityError` (`-32021`).
30:	*
31:	* @extends Error<array{code: -32601, message: non-empty-string, data?: mixed}>
32:	*
33:	* @see https://modelcontextprotocol.io/specification/draft/schema#methodnotfounderror
34:	*/
35:	final readonly class MethodNotFoundError extends Error
36:	{
37:	public const string DEFAULT_MESSAGE = 'Method not found';
38:
39:	public function __construct(string $message, mixed $data = null)
40:	{
41:	parent::__construct(code: ProtocolErrorCode::MethodNotFound, message: $message, data: $data);
42:	}
43:
44:	#[\Override]
45:	public static function fromArray(array $data): static
46:	{
47:	$message = $data['message'] ?? self::DEFAULT_MESSAGE;
48:	Assert::that($message)->isString('error "message" must be a string, {type} given.');
49:
50:	return new self(message: $message, data: $data['data'] ?? null);
51:	}
52:
53:	#[\Override]
54:	public function toArray(): array
55:	{
56:	$result = [
57:	'code' => ProtocolErrorCode::MethodNotFound->value,
58:	'message' => $this->message,
59:	];
60:
61:	$data = $this->data ?? [];
62:
63:	if ([] !== $data) {
64:	$result['data'] = $data;
65:	}
66:
67:	return $result;
68:	}
69:	}
70:

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