import type { ConversationStore } from '../../../types/conversation-store.interface';
/**
 * Load existing conversation state for a thread.
 * Returns undefined conversationId on first turn — OpenAI auto-creates the
 * conversation and returns its ID in the response (response.conversation.id).
 * The caller is responsible for persisting that ID via store.save() after
 * receiving the first response.
 */
export declare function loadConversationState({ store, threadKey, }: {
    store: ConversationStore;
    threadKey: string;
}): Promise<{
    conversationId: string | undefined;
    lastResponseId: string | undefined;
}>;
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