import type { SubagentToolDetails } from "../types.js";
export interface TimeoutSignalState {
    signal: AbortSignal | undefined;
    timedOut: () => boolean;
    cleanup: () => void;
}
export declare function formatDurationMs(ms: number): string;
export declare function subagentTimeoutMessage(timeoutMs: number): string;
export declare function createTimeoutSignal(baseSignal: AbortSignal | undefined, timeoutMs: number, label: string): TimeoutSignalState;
export declare function markSubagentTimedOut(details: SubagentToolDetails, timeoutMs: number): SubagentToolDetails & {
    status: "aborted";
    error: string;
};