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80行代码手写AI Agent,支持记忆和工具调用

  • 2026-02-06 11:41:56
80行代码手写AI Agent,支持记忆和工具调用

拒绝空谈,只讲落地的AI实战技巧。今天带你用LangChain TS手写一个具备记忆、工具调用能力的AI Agent。

一、为什么企业需要自建Agent?

现在Claude Code、ChatGPT等AI助手已经很强大了,为什么企业还需要自己开发Agent?

核心原因:企业私有知识库的定制化需求。

通用AI工具面对的是大众场景,但企业内部需要:

  • 接入公司产品的知识库(做客服AI)
  • 定制化的工作流程(自动化审批、数据分析)
  • 符合企业规范的数据安全(私有化部署)

举个例子:你要做一个公司产品的智能客服,需要把产品的所有文档、FAQ、历史工单都喂给大模型,这时就需要**RAG(检索增强生成)**技术。

LangChain就是解决这些问题的神器——它之于AI应用,就像Spring之于Java,已是AI Agent开发的事实标准。


二、先看效果:80行代码实现什么功能?

用80行代码,我们实现了一个具备以下能力的AI Agent:

✅ 长期记忆:多轮对话记住上下文(像Claude Code一样)✅ 工具调用:能自动决策何时调用指定的工具✅ JSON输出:结构化数据返回,便于程序处理✅ 自定义模型:支持OpenAI、通义千问、智谱等任何兼容OpenAI协议的模型


三、完整代码实现(可直接复制使用)

import { createAgent, tool, type ToolRuntime } from"langchain";import { ChatOpenAI } from'@langchain/openai'import { MemorySaver } from"@langchain/langgraph";import * as z from"zod";// 系统提示词const systemPrompt = `You are an expert weather forecaster, who speaks in puns.You have access to two tools:- get_weather_for_location: use this to get the weather for a specific location- get_user_location: use this to get the user's locationIf a user asks you for the weather, make sure you know the location. If you can tell from the question that they mean wherever they are, use the get_user_location tool to find their location.`;// 定义工具1:查询天气const getWeather = tool(    ({ city }) =>`It's always sunny in ${city}!`,  {    name"get_weather_for_location",    description"Get the weather for a given city",    schema: z.object({    city: z.string(),    }),  });// 定义工具2:获取用户位置(可接入数据库)type AgentRuntime = ToolRuntime<unknown, { user_id: string }>;const getUserLocation = tool(    (_, config: AgentRuntime) => {    const { user_id } = config.context;    // 实际项目中这里可以查询数据库    return user_id === "1" ? "长沙" : "北京";  },  {    name"get_user_location",    description"Retrieve user information based on user ID",    schema: z.object({}),  });// 配置模型(支持任何OpenAI兼容的API)const model = await new ChatOpenAI({    modelName"glm-4.7-flash",  // 可换成 gpt-4、qwen-plus 等    maxRetries0,    timeout60000,    configuration: {        baseURL"https://open.bigmodel.cn/api/paas/v4/"// 自定义API地址  },    apiKey"your-api-key",    temperature0});// 定义返回数据的JSON结构const responseFormat = z.object({    punny_response: z.string(),    weather_conditions: z.string().optional(),});// 初始化记忆组件(多轮对话的关键)const checkpointer = new MemorySaver();// 组装Agentconst agent = createAgent({  model,  systemPrompt,  responseFormat,  checkpointer,  tools: [getUserLocation, getWeather],});// 配置:thread_id用于记忆管理,context用于传递业务参数const config = {    configurable: { thread_id"1" },    context: { user_id"1" },};// 第一轮对话console.log('第一轮对话...')const response = await agent.invoke(  { messages: [{ role"user"content"what is the weather outside?" }] },  config);console.log(response.structuredResponse);// 第二轮对话(Agent记得上下文)const thankYouResponse = await agent.invoke(  { messages: [{ role"user"content"thank you!" }] },  config);console.log(thankYouResponse.structuredResponse);

四、如何运行这个Demo?

前置要求:Node.js v20+

# 1. 安装依赖npm install -g pnpmpnpm install# 2. 运行代码tsx src/quickstart.ts

五、获取完整项目

关注公众号**「静远AI实战」,后台回复「Agent」**领取:

  • 完整Demo代码

实战小贴士:开发Agent时,先用简单的Prompt测试流程,再逐步接入工具和数据库。从"能用"到"好用",中间需要大量的Prompt调优。


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.cls-1{fill:#001e36;}.cls-2{fill:#31a8ff;}
.cls-1{fill:#001e36;}.cls-2{fill:#31a8ff;}
.cls-1{fill:#001e36;}.cls-2{fill:#31a8ff;}
.cls-1{fill:#001e36;}.cls-2{fill:#31a8ff;}
.cls-1{fill:#001e36;}.cls-2{fill:#31a8ff;}

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  1. CONNECT:[ UseTime:0.000799s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000786s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000249s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000308s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000464s ]
  6. SELECT * FROM `set` [ RunTime:0.000331s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000521s ]
  8. SELECT * FROM `article` WHERE `id` = 469935 LIMIT 1 [ RunTime:0.000773s ]
  9. UPDATE `article` SET `lasttime` = 1770449027 WHERE `id` = 469935 [ RunTime:0.004177s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.007773s ]
  11. SELECT * FROM `article` WHERE `id` < 469935 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000642s ]
  12. SELECT * FROM `article` WHERE `id` > 469935 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002756s ]
  13. SELECT * FROM `article` WHERE `id` < 469935 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006796s ]
  14. SELECT * FROM `article` WHERE `id` < 469935 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001087s ]
  15. SELECT * FROM `article` WHERE `id` < 469935 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003528s ]
0.183324s