import type { RuntimeBlock, RuntimeFailureSummary } from "./types.js";
/**
 * Transcript writer：块和最终回复追加写入 transcript.jsonl，供本地诊断与回放。
 * 所有 text/raw 落盘前脱敏；raw 只进本地 transcript，不上 wire。
 */
export declare class TranscriptWriter {
    private readonly file;
    constructor(file: string);
    writeBlock(block: RuntimeBlock): void;
    writeFinal(text: string): void;
    writeFailure(failure: Partial<RuntimeFailureSummary>): void;
    private append;
    get path(): string;
}