/**
 * Aggregation helper — run a bag of named async fetchers in parallel via
 * `Promise.allSettled`, push labeled rejection messages onto a caveats array,
 * and return a typed object whose values are `null` for any rejected fetcher.
 *
 * Designed for the aggregation-tool pattern where one failed sub-call should
 * not poison the whole response (the surviving values still flow through, and
 * the partial-data condition is surfaced via the returned `caveats` array).
 *
 * Each consumer MCP previously inlined this logic — typically 10-15 lines per
 * aggregation tool. This helper is the deduplication.
 */
export type Fetchers = Record<string, () => Promise<unknown>>;
export type Aggregated<T extends Fetchers> = {
    [K in keyof T]: Awaited<ReturnType<T[K]>> | null;
};
/**
 * Default rejection-reason → string formatter. Handles Error instances,
 * strings, and falls back to JSON.stringify. Override per call when the API
 * client throws structured exceptions you want to unpack differently.
 */
export declare function defaultFormatReason(reason: unknown): string;
export declare function aggregate<T extends Fetchers>(fetchers: T, caveats: string[], formatReason?: (reason: unknown) => string): Promise<Aggregated<T>>;
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