import { Tool, ToolParams } from "@langchain/core/tools";
import { SearchOptions } from "duck-duck-scrape";
export { SafeSearchType, SearchOptions, SearchTimeType, } from "duck-duck-scrape";
export interface DuckDuckGoSearchParameters extends ToolParams {
    /**
     * The search options for the search using the SearchOptions interface
     * from the duck-duck-scrape package.
     */
    searchOptions?: SearchOptions;
    /**
     * The maximum number of results to return from the search.
     * Limiting to 10 to avoid context overload.
     * @default 10
     */
    maxResults?: number;
}
/**
 * DuckDuckGo tool integration.
 *
 * Setup:
 * Install `@langchain/community` and `duck-duck-scrape`.
 *
 * ```bash
 * npm install @langchain/community duck-duck-scrape
 * ```
 *
 * ## [Constructor args](https://api.js.langchain.com/classes/_langchain_community.tools_duckduckgo_search.DuckDuckGoSearch.html#constructor)
 *
 * <details open>
 * <summary><strong>Instantiate</strong></summary>
 *
 * ```typescript
 * import { DuckDuckGoSearch } from "@langchain/community/tools/duckduckgo_search";
 *
 * const tool = new DuckDuckGoSearch({ maxResults: 1 });
 * ```
 * </details>
 *
 * <br />
 *
 * <details>
 *
 * <summary><strong>Invocation</strong></summary>
 *
 * ```typescript
 * await tool.invoke("what is the current weather in sf?");
 *
 * // output: [{"title":"San Francisco, CA Current Weather | AccuWeather","link":"https://www.accuweather.com/en/us/san-francisco/94103/current-weather/347629","snippet":"<b>Current</b> <b>weather</b> <b>in</b> San Francisco, CA. Check <b>current</b> conditions in San Francisco, CA with radar, hourly, and more."}]
 * ```
 * </details>
 *
 * <br />
 *
 * <details>
 *
 * <summary><strong>Invocation with tool call</strong></summary>
 *
 * ```typescript
 * // This is usually generated by a model, but we'll create a tool call directly for demo purposes.
 * const modelGeneratedToolCall = {
 *   args: {
 *     input: "what is the current weather in sf?",
 *   },
 *   id: "tool_call_id",
 *   name: tool.name,
 *   type: "tool_call",
 * };
 * await tool.invoke(modelGeneratedToolCall);
 * ```
 *
 * ```text
 * ToolMessage {
 *   "content": "[{\"title\":\"San Francisco, CA Weather Conditions | Weather Underground\",\"link\":\"https://www.wunderground.com/weather/us/ca/san-francisco\",\"snippet\":\"San Francisco <b>Weather</b> Forecasts. <b>Weather</b> Underground provides local & long-range <b>weather</b> forecasts, weatherreports, maps & tropical <b>weather</b> conditions for the San Francisco area.\"}]",
 *   "name": "duckduckgo-search",
 *   "additional_kwargs": {},
 *   "response_metadata": {},
 *   "tool_call_id": "tool_call_id"
 * }
 * ```
 * </details>
 */
export declare class DuckDuckGoSearch extends Tool {
    private searchOptions?;
    private maxResults;
    constructor(params?: DuckDuckGoSearchParameters);
    static lc_name(): string;
    name: string;
    description: string;
    _call(input: string): Promise<string>;
}