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TavilySearchResults

Tavily 搜索是一个专为 LLM 代理量身定制的强大搜索 API。它与各种数据源无缝集成，以确保卓越的相关搜索体验。

本指南提供了快速入门指南，用于开始使用 Tavily 搜索结果 工具。有关所有 TavilySearchResults 功能和配置的详细文档，请前往 API 参考。

概述​

集成细节​

类包PY 支持最新包
TavilySearchResults@langchain/community✅NPM - Version

设置​

集成位于 @langchain/community 包中，您可以按照以下步骤安装它

提示

查看 本节，了解有关安装集成包的一般说明。

yarn add @langchain/community

凭据​

设置 API 密钥 在此，并将其设置为名为 TAVILY_API_KEY 的环境变量。

process.env.TAVILY_API_KEY = "YOUR_API_KEY";

设置 LangSmith 也很有用（但不是必需的），以获得最佳的观测性

process.env.LANGCHAIN_TRACING_V2 = "true";
process.env.LANGCHAIN_API_KEY = "your-api-key";

实例化​

您可以像这样导入并实例化 TavilySearchResults 工具的实例

import { TavilySearchResults } from "@langchain/community/tools/tavily_search";

const tool = new TavilySearchResults({
  maxResults: 2,
  // ...
});

调用​

直接使用参数调用​

您可以像这样直接调用工具

await tool.invoke({
  input: "what is the current weather in SF?",
});
[{"title":"San Francisco, CA Current Weather | AccuWeather","url":"https://www.accuweather.com/en/us/san-francisco/94103/current-weather/347629","content":"Current weather in San Francisco, CA. Check current conditions in San Francisco, CA with radar, hourly, and more.","score":0.9428234,"raw_content":null},{"title":"National Weather Service","url":"https://forecast.weather.gov/zipcity.php?inputstring=San+Francisco,CA","content":"NOAA National Weather Service. Current conditions at SAN FRANCISCO DOWNTOWN (SFOC1) Lat: 37.77056°NLon: 122.42694°WElev: 150.0ft.","score":0.94261247,"raw_content":null}]

使用 ToolCall 调用​

我们也可以使用模型生成的 ToolCall 调用工具，在这种情况下，将返回一个 ToolMessage

// 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: "1",
  name: tool.name,
  type: "tool_call",
};

await tool.invoke(modelGeneratedToolCall);
ToolMessage {
  "content": "[{\"title\":\"Weather in San Francisco\",\"url\":\"https://www.weatherapi.com/\",\"content\":\"{'location': {'name': 'San Francisco', 'region': 'California', 'country': 'United States of America', 'lat': 37.78, 'lon': -122.42, 'tz_id': 'America/Los_Angeles', 'localtime_epoch': 1722967498, 'localtime': '2024-08-06 11:04'}, 'current': {'last_updated_epoch': 1722967200, 'last_updated': '2024-08-06 11:00', 'temp_c': 18.4, 'temp_f': 65.2, 'is_day': 1, 'condition': {'text': 'Sunny', 'icon': '//cdn.weatherapi.com/weather/64x64/day/113.png', 'code': 1000}, 'wind_mph': 2.9, 'wind_kph': 4.7, 'wind_degree': 275, 'wind_dir': 'W', 'pressure_mb': 1015.0, 'pressure_in': 29.97, 'precip_mm': 0.0, 'precip_in': 0.0, 'humidity': 64, 'cloud': 2, 'feelslike_c': 18.5, 'feelslike_f': 65.2, 'windchill_c': 18.5, 'windchill_f': 65.2, 'heatindex_c': 18.4, 'heatindex_f': 65.2, 'dewpoint_c': 11.7, 'dewpoint_f': 53.1, 'vis_km': 10.0, 'vis_miles': 6.0, 'uv': 5.0, 'gust_mph': 4.3, 'gust_kph': 7.0}}\",\"score\":0.9983156,\"raw_content\":null},{\"title\":\"Weather in San Francisco in June 2024 - Detailed Forecast\",\"url\":\"https://www.easeweather.com/north-america/united-states/california/city-and-county-of-san-francisco/san-francisco/june\",\"content\":\"Until now, June 2024 in San Francisco is slightly cooler than the historical average by -0.6 ° C.. The forecast for June 2024 in San Francisco predicts the temperature to closely align with the historical average at 17.7 ° C. 17.7 ° C.\",\"score\":0.9905143,\"raw_content\":null}]",
  "name": "tavily_search_results_json",
  "additional_kwargs": {},
  "response_metadata": {},
  "tool_call_id": "1"
}

链式调用​

我们可以通过首先将工具绑定到 工具调用模型，然后调用它，在链中使用我们的工具

选择您的聊天模型

安装依赖项

提示

查看 本节，了解有关安装集成包的一般说明.

yarn add @langchain/openai

添加环境变量

OPENAI_API_KEY=your-api-key

实例化模型

import { ChatOpenAI } from "@langchain/openai";

const llm = new ChatOpenAI({
  model: "gpt-4o-mini",
  temperature: 0
});
import { HumanMessage } from "@langchain/core/messages";
import { ChatPromptTemplate } from "@langchain/core/prompts";
import { RunnableLambda } from "@langchain/core/runnables";

const prompt = ChatPromptTemplate.fromMessages([
  ["system", "You are a helpful assistant."],
  ["placeholder", "{messages}"],
]);

const llmWithTools = llm.bindTools([tool]);

const chain = prompt.pipe(llmWithTools);

const toolChain = RunnableLambda.from(async (userInput: string, config) => {
  const humanMessage = new HumanMessage(userInput);
  const aiMsg = await chain.invoke(
    {
      messages: [new HumanMessage(userInput)],
    },
    config
  );
  const toolMsgs = await tool.batch(aiMsg.tool_calls, config);
  return chain.invoke(
    {
      messages: [humanMessage, aiMsg, ...toolMsgs],
    },
    config
  );
});

const toolChainResult = await toolChain.invoke(
  "what is the current weather in sf?"
);
const { tool_calls, content } = toolChainResult;

console.log(
  "AIMessage",
  JSON.stringify(
    {
      tool_calls,
      content,
    },
    null,
    2
  )
);
AIMessage {
  "tool_calls": [],
  "content": "The current weather in San Francisco is as follows:\n\n- **Condition:** Sunny\n- **Temperature:** 18.4°C (65.2°F)\n- **Wind:** 2.9 mph (4.7 kph) from the west\n- **Humidity:** 64%\n- **Visibility:** 10 km (6 miles)\n- **UV Index:** 5\n\n![Sunny](//cdn.weatherapi.com/weather/64x64/day/113.png)\n\nFor more detailed information, you can visit [WeatherAPI](https://www.weatherapi.com/)."
}

代理​

有关如何在代理中使用 LangChain 工具的指南，请查看 LangGraph.js 文档。

API 参考​

有关所有 TavilySearchResults 功能和配置的详细文档，请前往 API 参考：https://api.js.langchain.com/classes/langchain_community_tools_tavily_search.TavilySearchResults.html

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