/**
 * The one way a `show_widget` call fails on purpose: the args are wrong. It
 * reaches the model as a tool error and carries the offending field names, so
 * the WARN log and the model see the same list.
 */
export declare class WidgetValidationError extends Error {
    readonly widgetType: string;
    readonly fields: string[];
    constructor(message: string, widgetType: string, fields: string[]);
}
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