/**
 * Module-scoped writable SessionManager for parent-mode session access.
 * Spec: §3.1.0 — Round-2 finding C2: ctx.sessionManager is ReadonlySessionManager
 *
 * The parent extension needs to write LLM-context entries (orca:agent-completion via
 * appendCustomMessageEntry) into its own session file. This module caches a writable
 * SessionManager handle opened once at session_start.
 */
import { SessionManager } from "@earendil-works/pi-coding-agent";
/**
 * Initialize the parent-mode writable SessionManager.
 * Must be called from session_start in parent mode AFTER persistence gate check.
 *
 * @param sessionFile - Parent's session file path
 * @param sessionDir - Parent's session directory (optional, for SessionManager.open)
 */
export declare function initParentWritable(sessionFile: string, sessionDir?: string): void;
/**
 * Get the cached writable SessionManager.
 * Returns undefined if not initialized or if initialization failed.
 *
 * @returns Writable SessionManager or undefined
 */
export declare function getParentWritable(): SessionManager | undefined;
/**
 * Dispose the cached writable SessionManager.
 * Called from session_before_switch/session_before_fork to clear state before transition.
 * SessionManager has no explicit close() method (per §1.3), so we just clear the reference.
 */
export declare function disposeParentWritable(): void;
/**
 * Check if the parent has a writable SessionManager available.
 * Useful for conditionally writing LLM-context entries only when safe.
 *
 * @returns True if writable SessionManager is available
 */
export declare function hasParentWritable(): boolean;
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