declare const toolBrand: unique symbol;
/**
 * The formatter key produced by a {@link tool} recipe: carries the parameter
 * `name` and, via `V`, the type its value must be at the call site. Interpolate
 * one into a {@link msg} template.
 */
type ToolKey<Name extends string = string, V = unknown> = {
    [toolBrand]: true;
    name: Name;
    format: (value: never, locale: string | undefined) => string;
    readonly __value?: V;
};

export type { ToolKey as T };