import { StructuredTool, ToolParams } from '@langchain/core/tools';
import { z } from 'zod';
import { HCS10Client } from '../hcs10/HCS10Client';
import { IStateManager } from '../state/state-types';
export interface CheckMessagesToolParams extends ToolParams {
    hcsClient: HCS10Client;
    stateManager: IStateManager;
}
/**
 * A tool to check for new messages on an active HCS-10 connection topic,
 * or optionally fetch the latest messages regardless of timestamp.
 */
export declare class CheckMessagesTool extends StructuredTool {
    name: string;
    description: string;
    schema: z.ZodObject<{
        targetIdentifier: z.ZodString;
        fetchLatest: z.ZodDefault<z.ZodOptional<z.ZodBoolean>>;
        lastMessagesCount: z.ZodOptional<z.ZodNumber>;
    }, "strip", z.ZodTypeAny, {
        targetIdentifier: string;
        fetchLatest: boolean;
        lastMessagesCount?: number | undefined;
    }, {
        targetIdentifier: string;
        fetchLatest?: boolean | undefined;
        lastMessagesCount?: number | undefined;
    }>;
    hcsClient: HCS10Client;
    private stateManager;
    private logger;
    constructor({ hcsClient, stateManager, ...rest }: CheckMessagesToolParams);
    protected _call({ targetIdentifier, fetchLatest, lastMessagesCount, }: z.infer<this['schema']>): Promise<string>;
}