import type { BrokerResponse } from "./broker";
export type OperationReserveResult = {
    status: "reserved";
} | {
    status: "replay";
    response: BrokerResponse;
} | {
    status: "in_progress";
} | {
    status: "conflict";
};
/**
 * Target-session-scoped idempotency key for a clientRef. Identical refs on
 * different sessions are independent, so a receipt can never replay or
 * conflict across sessions.
 */
export declare function operationReceiptKey(sessionId: string, clientRef: string): string;
export declare function operationReceiptDigest(operation: string, input: Record<string, unknown>, sessionId?: string): string;
export declare class OperationReceiptLedger {
    #private;
    constructor(agentDir: string);
    open(): Promise<void>;
    reserve(clientRef: string, digest: string): Promise<OperationReserveResult>;
    complete(clientRef: string, digest: string, response: BrokerResponse): Promise<void>;
}