import type { TranscriptContentItem, TranscriptLine } from "../types.js";
export declare const SUBAGENT_PREFIX = "sand-subagent-";
/** Host prependOverviewMetadataLine / getTranscriptTerminalMarkers. */
export declare const TRANSCRIPT_NON_MESSAGE_TYPES: readonly ["metadata", "turn_ended"];
export type ReadTranscriptOptions = {
    sandRoot?: string;
    /** Skip sand-subagent-* folders. Default true. */
    skipSubagents?: boolean;
    /** Keep only the last N parsed lines. */
    tail?: number;
    /**
     * Called per line. Return false to stop.
     * Do not log `line.message` bodies.
     */
    onLine?: (line: TranscriptLine, index: number) => boolean | void;
};
export declare function isTranscriptNonMessage(value: unknown): boolean;
/**
 * Host journal envelope: `{ role, message: { content } }`.
 * `content` is an array on disk; a string is accepted and normalized.
 */
export declare function isLegacyTranscriptEnvelope(value: unknown): value is {
    role: string;
    message: {
        content: unknown;
        [key: string]: unknown;
    };
};
export declare function parseLegacyTranscriptLine(value: unknown): TranscriptLine | null;
/** Host formatSingleMessageJsonl serialize shape. */
export declare function formatLegacyTranscriptLine(role: string, content: TranscriptContentItem[]): string;
export declare function readTranscript(agentId: string, options?: ReadTranscriptOptions): Promise<TranscriptLine[]>;
export type TranscriptIndexEntry = {
    agentId: string;
    path: string;
    bytes: number;
    isSubagent: boolean;
};
export declare function listTranscriptFiles(sandRoot?: string, options?: {
    skipSubagents?: boolean;
}): TranscriptIndexEntry[];
export declare function summarizeContent(content: TranscriptContentItem[]): {
    texts: number;
    toolUses: string[];
    toolResults: string[];
    other: number;
};
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