Protocol

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Protocol

class Protocol

Constants

VERSION

public const VERSION = '2026-07-28'

VERSION_2025_11_25

public const VERSION_2025_11_25 = '2025-11-25'

VERSION_2025_06_18

public const VERSION_2025_06_18 = '2025-06-18'

SUPPORTED_VERSIONS

public const SUPPORTED_VERSIONS = array (
  0 => 'self',
  1 => NULL,
  2 => 'VERSION',
  3 => 'self',
  4 => NULL,
  5 => 'VERSION_2025_11_25',
  6 => 'self',
  7 => NULL,
  8 => 'VERSION_2025_06_18',
)

META_PROTOCOL_VERSION

public const META_PROTOCOL_VERSION = 'io.modelcontextprotocol/protocolVersion'

META_CLIENT_INFO

public const META_CLIENT_INFO = 'io.modelcontextprotocol/clientInfo'

META_CLIENT_CAPABILITIES

public const META_CLIENT_CAPABILITIES = 'io.modelcontextprotocol/clientCapabilities'

META_SERVER_INFO

public const META_SERVER_INFO = 'io.modelcontextprotocol/serverInfo'

HEADER_PROTOCOL_VERSION

public const HEADER_PROTOCOL_VERSION = 'MCP-Protocol-Version'

HEADER_METHOD

public const HEADER_METHOD = 'Mcp-Method'

HEADER_NAME

public const HEADER_NAME = 'Mcp-Name'

METHOD_DISCOVER

public const METHOD_DISCOVER = 'server/discover'

METHOD_TOOLS_LIST

public const METHOD_TOOLS_LIST = 'tools/list'

METHOD_TOOLS_CALL

public const METHOD_TOOLS_CALL = 'tools/call'

METHOD_INITIALIZE

public const METHOD_INITIALIZE = 'initialize'

RESULT_COMPLETE

public const RESULT_COMPLETE = 'complete'

ERROR_PARSE

public const ERROR_PARSE = -32700

ERROR_INVALID_REQUEST

public const ERROR_INVALID_REQUEST = -32600

ERROR_METHOD_NOT_FOUND

public const ERROR_METHOD_NOT_FOUND = -32601

ERROR_INVALID_PARAMS

public const ERROR_INVALID_PARAMS = -32602

ERROR_INTERNAL

public const ERROR_INTERNAL = -32603

ERROR_HEADER_MISMATCH

public const ERROR_HEADER_MISMATCH = -32020

ERROR_MISSING_CLIENT_CAPABILITY

public const ERROR_MISSING_CLIENT_CAPABILITY = -32021

ERROR_UNSUPPORTED_PROTOCOL_VERSION

public const ERROR_UNSUPPORTED_PROTOCOL_VERSION = -32022

BASE64_PREFIX

public const BASE64_PREFIX = '=?base64?'

BASE64_SUFFIX

public const BASE64_SUFFIX = '?='

Methods

__construct

private __construct(): void

decodeHeaderValue

Decodes a header value that may be wrapped in the base64 sentinel.

public decodeHeaderValue(string $value): string

Returns: string

Values must be decoded before being compared against the request body, otherwise a client that legitimately encoded a non-ASCII tool name would fail header validation.

Parameters

Parameter	Type	Description
`$value`	string	the raw header value

Generated by Hazaar API Doc Generator on Sun, 23 Aug 2026 10:49:44 +0000