import type { Message } from '../../types/message/index.js';
import type { ConversationManager } from '../interface.js';
/**
 * No-op conversation manager implementation.
 * Never modifies messages, useful for testing or when context management is disabled.
 */
export declare class NullManager implements ConversationManager {
    readonly name = "null";
    applyManagement(messages: Message[]): Message[];
    reduceContext(_messages: Message[], _overflowTokens: number): boolean;
}
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