export interface CostRecord {
    ts?: string;
    sessionId: string;
    event: string;
    toolName?: string;
    model?: string;
    inTokens?: number;
    outTokens?: number;
    rawOutTokens?: number;
    savedTokens?: number;
    rawPath?: string;
    estUSD?: number;
    note?: string;
}
export interface ReadCostOptions {
    sessionId?: string;
    today?: boolean;
}
export declare function costLedgerPath(cwd: string, sessionId: string): string;
export declare function appendCostRecord(cwd: string, record: CostRecord): string;
export declare function readCostRecords(cwd: string, options?: ReadCostOptions): CostRecord[];