/**
 * Session file archive module.
 *
 * Provides functions to copy subagent session files to a dedicated archive
 * store for auditability and crash resilience. The archive store is located at:
 *   <PI_CODING_AGENT_DIR>/subagent-sessions/<parentSessionId>/<harnessId>/<agentId>/
 *
 * Session files are copied at each turn increment so the latest state is
 * preserved even if the subagent crashes unexpectedly.
 */
import type { HarnessEnvironment } from "#src/harness/interface";
/**
 * Get the archive directory path for a subagent's session file.
 */
export declare function getArchiveDir(parentSessionId: string, harnessId: string, agentId: string): string;
/**
 * Get the archive file path for a subagent's session file.
 */
export declare function getArchivePath(parentSessionId: string, harnessId: string, agentId: string): string;
/**
 * Archive the session file by copying it to the dedicated store.
 *
 * Creates the archive directory if it doesn't exist.
 * Overwrites any previous copy at that path.
 *
 * @param env - The harness environment with sessionFilePath
 * @param parentSessionId - The parent pi session ID
 * @param harnessId - The harness ID (e.g., "pi", "cmd")
 * @param agentId - The unique agent ID
 * @returns The archive path, or undefined if no session file exists
 */
export declare function archiveSessionFile(env: HarnessEnvironment, parentSessionId: string, harnessId: string, agentId: string): string | undefined;
/**
 * Check if an archived session file exists for a given agent.
 */
export declare function archivedSessionExists(parentSessionId: string, harnessId: string, agentId: string): boolean;
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