Write one JSON-RPC message as a single newline-delimited line, serialized against concurrent writers. Json.toString never emits a raw newline, so the line framing holds and only a valid MCP message is written.
Write one JSON-RPC message as a single newline-delimited line, serialized against concurrent writers. Json.toString never emits a raw newline, so the line framing holds and only a valid MCP message is written.