/**
 * Abort-aware promise waiting shared by tool execute paths.
 * Cancelling the wait must not permanently consume a future agent result;
 * callers own that policy around this helper.
 */
export declare function createAbortError(signal: AbortSignal, fallbackMessage?: string): Error;
/**
 * Recognize AbortError-shaped values, including DOMException from createAbortError().
 * Do not require `instanceof Error` — some hosts expose AbortError DOMExceptions
 * that fail that check, which would make Esc-cancel look like a settled result.
 */
export declare function isAbortError(error: unknown): error is {
    name: "AbortError";
};
/**
 * Await `promise`, or reject with AbortError when `signal` aborts first.
 * Already-aborted signals reject immediately without racing the promise.
 * Preserves the resolved value of `promise`.
 */
export declare function waitForPromiseOrAbort<T>(promise: Promise<T>, signal?: AbortSignal, fallbackMessage?: string): Promise<T>;