/** Parse Friday app session keys for transcript storage. */
export type ParsedFridaySession = {
    /** Raw app session key (verbatim from client). */
    sessionKey: string;
    /** Account id when present in key, else undefined (caller supplies from header). */
    accountIdFromKey?: string;
    /** Stable file id for JSONL (session uuid or legacy tail). */
    sessionFileId: string;
};
export declare function sessionFileIdFromKey(sessionKey: string): string;
export declare function parseFridaySessionKey(sessionKey: string): ParsedFridaySession;
export declare function sessionBelongsToAccount(sessionKey: string, accountId: string): boolean;
