Constant Field Values

Contents

• io.modelcontextprotocol.*

io.modelcontextprotocol.*

io.modelcontextprotocol.client.McpAsyncClient

Modifier and Type	Constant Field	Value
public static final String	NEGOTIATED_PROTOCOL_VERSION	"io.modelcontextprotocol.client.negotiated-protocol-version"

io.modelcontextprotocol.common.McpTransportContext

Modifier and Type	Constant Field	Value
public static final String	KEY	"MCP_TRANSPORT_CONTEXT"

io.modelcontextprotocol.server.transport.HttpServletSseServerTransportProvider

Modifier and Type	Constant Field	Value
public static final String	APPLICATION_JSON	"application/json"
public static final String	DEFAULT_BASE_URL	""
public static final String	DEFAULT_SSE_ENDPOINT	"/sse"
public static final String	ENDPOINT_EVENT_TYPE	"endpoint"
public static final String	FAILED_TO_SEND_ERROR_RESPONSE	"Failed to send error response: {}"
public static final String	MESSAGE_EVENT_TYPE	"message"
public static final String	SESSION_ID	"sessionId"
public static final String	UTF_8	"UTF-8"

io.modelcontextprotocol.server.transport.HttpServletStatelessServerTransport

Modifier and Type	Constant Field	Value
public static final String	ACCEPT	"Accept"
public static final String	APPLICATION_JSON	"application/json"
public static final String	FAILED_TO_SEND_ERROR_RESPONSE	"Failed to send error response: {}"
public static final String	TEXT_EVENT_STREAM	"text/event-stream"
public static final String	UTF_8	"UTF-8"

io.modelcontextprotocol.server.transport.HttpServletStreamableServerTransportProvider

Modifier and Type	Constant Field	Value
public static final String	APPLICATION_JSON	"application/json"
public static final String	ENDPOINT_EVENT_TYPE	"endpoint"
public static final String	FAILED_TO_SEND_ERROR_RESPONSE	"Failed to send error response: {}"
public static final String	MESSAGE_EVENT_TYPE	"message"
public static final String	TEXT_EVENT_STREAM	"text/event-stream"
public static final String	UTF_8	"UTF-8"

io.modelcontextprotocol.spec.HttpHeaders

Modifier and Type	Constant Field	Value
public static final String	ACCEPT	"Accept"
public static final String	CACHE_CONTROL	"Cache-Control"
public static final String	CONTENT_LENGTH	"Content-Length"
public static final String	CONTENT_TYPE	"Content-Type"
public static final String	LAST_EVENT_ID	"Last-Event-ID"
public static final String	MCP_SESSION_ID	"Mcp-Session-Id"
public static final String	PROTOCOL_VERSION	"MCP-Protocol-Version"

io.modelcontextprotocol.spec.McpSchema

Modifier and Type	Constant Field	Value
public static final String	JSONRPC_VERSION	"2.0"
public static final String	METHOD_COMPLETION_COMPLETE	"completion/complete"
public static final String	METHOD_ELICITATION_CREATE	"elicitation/create"
public static final String	METHOD_INITIALIZE	"initialize"
public static final String	METHOD_LOGGING_SET_LEVEL	"logging/setLevel"
public static final String	METHOD_NOTIFICATION_INITIALIZED	"notifications/initialized"
public static final String	METHOD_NOTIFICATION_MESSAGE	"notifications/message"
public static final String	METHOD_NOTIFICATION_PROGRESS	"notifications/progress"
public static final String	METHOD_NOTIFICATION_PROMPTS_LIST_CHANGED	"notifications/prompts/list_changed"
public static final String	METHOD_NOTIFICATION_RESOURCES_LIST_CHANGED	"notifications/resources/list_changed"
public static final String	METHOD_NOTIFICATION_RESOURCES_UPDATED	"notifications/resources/updated"
public static final String	METHOD_NOTIFICATION_ROOTS_LIST_CHANGED	"notifications/roots/list_changed"
public static final String	METHOD_NOTIFICATION_TOOLS_LIST_CHANGED	"notifications/tools/list_changed"
public static final String	METHOD_PING	"ping"
public static final String	METHOD_PROMPT_GET	"prompts/get"
public static final String	METHOD_PROMPT_LIST	"prompts/list"
public static final String	METHOD_RESOURCES_LIST	"resources/list"
public static final String	METHOD_RESOURCES_READ	"resources/read"
public static final String	METHOD_RESOURCES_SUBSCRIBE	"resources/subscribe"
public static final String	METHOD_RESOURCES_TEMPLATES_LIST	"resources/templates/list"
public static final String	METHOD_RESOURCES_UNSUBSCRIBE	"resources/unsubscribe"
public static final String	METHOD_ROOTS_LIST	"roots/list"
public static final String	METHOD_SAMPLING_CREATE_MESSAGE	"sampling/createMessage"
public static final String	METHOD_TOOLS_CALL	"tools/call"
public static final String	METHOD_TOOLS_LIST	"tools/list"

io.modelcontextprotocol.spec.McpSchema.ErrorCodes

Modifier and Type	Constant Field	Value
public static final int	INTERNAL_ERROR	-32603
public static final int	INVALID_PARAMS	-32602
public static final int	INVALID_REQUEST	-32600
public static final int	METHOD_NOT_FOUND	-32601
public static final int	PARSE_ERROR	-32700
public static final int	RESOURCE_NOT_FOUND	-32002

io.modelcontextprotocol.spec.McpSchema.PromptReference

Modifier and Type	Constant Field	Value
public static final String	TYPE	"ref/prompt"

io.modelcontextprotocol.spec.McpSchema.ResourceReference

Modifier and Type	Constant Field	Value
public static final String	TYPE	"ref/resource"

io.modelcontextprotocol.spec.ProtocolVersions

Modifier and Type	Constant Field	Value
public static final String	MCP_2024_11_05	"2024-11-05"
public static final String	MCP_2025_03_26	"2025-03-26"
public static final String	MCP_2025_06_18	"2025-06-18"
public static final String	MCP_2025_11_25	"2025-11-25"

io.modelcontextprotocol.util.ToolNameValidator

Modifier and Type	Constant Field	Value
public static final String	STRICT_VALIDATION_PROPERTY	"io.modelcontextprotocol.strictToolNameValidation"