export type ToolHistoryRequestSettlement<T> = {
    readonly status: "fulfilled";
    readonly value: T;
} | {
    readonly status: "rejected";
    readonly error: unknown;
};
export type ToolHistoryForegroundSettlement<T> = {
    readonly status: "settled";
    readonly settlement: ToolHistoryRequestSettlement<T>;
} | {
    readonly status: "deferred";
};
type TrackedSettlement = Promise<ToolHistoryRequestSettlement<unknown>>;
/**
 * Tracks accepted lifecycle requests after the foreground stream wait ends.
 * The class is internal: persistence receipts remain the package boundary.
 */
export declare class ToolHistoryPersistenceCoordinator {
    private readonly foregroundCeilingMs;
    private readonly byRun;
    private readonly all;
    constructor(foregroundCeilingMs: number);
    track<T>(runKey: string, completion: Promise<T>, onSettled?: (settlement: ToolHistoryRequestSettlement<T>) => void): Promise<ToolHistoryForegroundSettlement<T>>;
    boundaryForRun(runKey: string): readonly TrackedSettlement[];
    boundaryForAll(): readonly TrackedSettlement[];
    pendingForRun(runKey: string): number;
    waitForBoundary(boundary: readonly Promise<unknown>[], timeoutMs: number): Promise<boolean>;
}
export {};
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