import type { ThreadHookConfig, RunThreadOptions } from '../../core/types/thread-types.js';
/** Run a lifecycle hook (onStart/onTransition/onEnd) if configured.
 *  logSuffix lets callers preserve detailed log info (e.g. transition arrows). */
export declare function executeLifecycleHook(threadId: string, phase: 'start' | 'transition' | 'end', hookConfig: ThreadHookConfig | undefined, opts: RunThreadOptions, previousAgent?: string, logSuffix?: string): Promise<void>;