@modelcontextprotocol/ext-apps - v0.2.2
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    Variable McpUiToolCancelledNotificationSchemaConst

    McpUiToolCancelledNotificationSchema: ZodObject<
        {
            method: ZodLiteral<"ui/notifications/tool-cancelled">;
            params: ZodObject<{ reason: ZodOptional<ZodString> }, $strip>;
        },
        $strip,
    > = ...

    Notification that tool execution was cancelled (Host -> Guest UI). Host MUST send this if tool execution was cancelled for any reason (user action, sampling error, classifier intervention, etc.).