NewProtocol creates a new Protocol instance.

Progress represents a progress update.

Protocol implements MCP protocol framing on top of a pluggable transport, including features like request/response linking, notifications, and progress.

ProtocolOptions contains additional initialization options.

RequestHandlerExtra contains extra data given to request handlers.

RequestOptions contains options that can be given per request.

ProgressCallback is a callback for progress notifications.

This result property is reserved by the protocol to allow clients and servers to attach additional metadata to their responses.