/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { BaseDeclarativeTool, type ToolInvocation } from './tools.js';
import type { MessageBus } from '../confirmation-bus/message-bus.js';
import { Config } from '../config/config.js';
import { type WebSearchToolParams, type WebSearchToolResult } from './google-web-search-invocation.js';
export type { WebSearchToolParams, WebSearchToolResult, } from './google-web-search-invocation.js';
/**
 * A tool to perform web searches using Google Search via the Gemini API.
 */
export declare class GoogleWebSearchTool extends BaseDeclarativeTool<WebSearchToolParams, WebSearchToolResult> {
    private readonly config;
    static readonly Name: string;
    constructor(config: Config, messageBus?: MessageBus);
    /**
     * Validates the parameters for the GoogleWebSearchTool.
     * @param params The parameters to validate
     * @returns An error message string if validation fails, null if valid
     */
    protected validateToolParamValues(params: WebSearchToolParams): string | null;
    protected createInvocation(params: WebSearchToolParams, messageBus?: MessageBus): ToolInvocation<WebSearchToolParams, WebSearchToolResult>;
}