The host MAY send this notification zero or more times while the agent is
streaming tool arguments, before McpUiToolInputNotification is sent
with complete arguments.
The arguments object represents best-effort recovery of incomplete JSON, with
unclosed structures automatically closed to produce valid JSON. Guest UIs may
ignore these notifications or use them to render progressive loading states.
Guest UIs MUST NOT rely on partial arguments for critical operations and SHOULD
gracefully handle missing or changing fields between notifications.
Notification containing partial/streaming tool arguments (Host → Guest UI).
The host MAY send this notification zero or more times while the agent is streaming tool arguments, before McpUiToolInputNotification is sent with complete arguments.
The arguments object represents best-effort recovery of incomplete JSON, with unclosed structures automatically closed to produce valid JSON. Guest UIs may ignore these notifications or use them to render progressive loading states.
Guest UIs MUST NOT rely on partial arguments for critical operations and SHOULD gracefully handle missing or changing fields between notifications.