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Langchain initialize agent. One of its most exciting aspects is the Agents .


  • Langchain initialize agent. We will first create it WITHOUT memory, but we will then show how to add memory in. For a quick start to working with agents, please check out this getting started guide. LangChain recommends moving to LangGraph’s node‑based approach for better control flow, built‑in persistence, and the ability to use multi‑actor workflows. x 中已被标记为不推荐（建议使用 LangGraph），但它仍然可用，且 AgentType Jan 11, 2024 · LangChain v0. Class hierarchy: Mar 26, 2024 · Based on your request, it seems you want to identify which retrieval tools were used and the context they provided to the language model when invoking an agent using the initialize_agent function from langchain. Memory in Agent This notebook goes over adding memory to an Agent. Here's how you can do it: Custom agent This notebook goes through how to create your own custom agent. initialize_agent(tools: Sequence[BaseTool], llm: BaseLanguageModel, agent: Optional[AgentType] = None, callback_manager: Optional[BaseCallbackManager] = None, agent_path: Optional[str] = None, agent_kwargs: Optional[dict] = None, *, tags: Optional[Sequence[str]] = None, **kwargs: Any) → AgentExecutor [source] ¶ Load Set up your LangChain handler to make the calls Note that you don’t need to set up a separate agentops. agent import AgentExecutor from langchain. Class hierarchy: Jul 9, 2025 · WHY MIGRATE NOW? LangChain announced that with LangChain 0. llm (BaseLanguageModel) – Language model to use as the agent. Issue Content Currently there's a bunch of tools and other integrations that use initialize_agent in their docs page ( May 14, 2024 · langchain. Thanks in advance. agents import initialize_agent, load_tools, AgentType from langchain. 0 版本提供了一种新的初始化代理的方法。我们必须对每种类型使用明确定义的方法，而不是使用initialize_agent。还有一个称为 prompt 的附加参数。我们可以使用默认提示（您可以参考文档查看每个代理的提示）。 OpenAI 函数代理的默认提示示例： prompt = hub. llms import GradientLLM Mar 28, 2023 · from langchain. from langchain. Tools are essentially functions that extend the agent’s capabilities by Here we focus on how to move from legacy LangChain agents to more flexible LangGraph agents. 17 ¶ langchain. Understand how LangChain agents enhance LLM applications by dynamically integrating external tools, APIs, and real-time data access. Is there an alternative way to pass a custom output parser? System Info langchain==0. agents import initialize_agent # Imports the initialize_agent function agent = initialize_agent(tool_list, # Provides the list of tools Dec 9, 2024 · [docs] @deprecated( "0. chains import LLMMathChain from langchain_core. LangGraph is an extension of LangChain specifically aimed at creating highly controllable and customizable agents. llms import OpenAI # チャットモデルのラッパーを初期化 chat = ChatOpenAI (temperature =0. Concepts There are several key concepts to understand when building agents: Agents, AgentExecutor, Tools, Toolkits. agent. Setup: LangSmith By definition, agents take a self-determined, input-dependent 1. AgentExecutor # class langchain. This covers basics like initializing an agent, creating tools, and adding memory. llms import OpenAI llm = OpenAI (temperature=0) tools = load_tools (["llm-math"], llm=llm) agent = initialize_agent (tools, llm, agent="zero-shot-react-description", verbose=True, return_intermediate_steps=True) agent. Agent # class langchain. deprecation import AGENT_DEPRECATION_WARNING from langchain. AgentOutputParser [source] # Bases: BaseOutputParser[Union[AgentAction, AgentFinish]] Base class for parsing agent output into agent action/finish. Through this, the agents can call the addition tool for its mathematical Jul 24, 2024 · 文章浏览阅读1. base. May 1, 2025 · 在 LangChain 中， initialize_agent 函数用于创建代理（Agent），其中 agent 参数通过指定 AgentType 来定义代理的类型。 AgentType 枚举了 LangChain 支持的代理类型，每种类型对应不同的代理行为和提示策略。尽管 initialize_agent 在 LangChain 0. agents import AgentType, initialize_agent, load_tools from langchain. initialize_agent ¶ langchain. There were multiple solutions provided by the community, including using sys_message to change the prompt and using agent_kwargs to set a custom prompt via initialize_agent(). One of its most exciting aspects is the Agents Oct 31, 2023 · from langchain. Jun 15, 2025 · initialize_agent方法作为LangChain框架中的重要组成部分，为开发者提供了构建智能工具调用系统的有效途径。 通过自动化的工具选择、标准化的流程处理和简化的开发接口，该方法显著降低了智能体开发的技术门槛和复杂度。 LangChain 🔌 MCP. It takes the agent class, the language model, and an optional list of tools as input. May 5, 2024 · 十、定义提示语 LangChain v0. The main advantages of using the SQL Agent are: It can answer questions based on the databases' schema as well as on the databases' content (like describing a specific table). With built-in support for tool use, memory, and reasoning, LangChain makes it easy to build autonomous agents that perform multi-step tasks. Contribute to langchain-ai/langchain-mcp-adapters development by creating an account on GitHub. To achieve this, you can include the system message in the agent_kwargs when initializing the agent. LangChain agents (the AgentExecutor in particular) have multiple configuration parameters. memory import ConversationBufferMemory llm = OpenAI(openai_api_key Agents LangChain has a SQL Agent which provides a more flexible way of interacting with SQL Databases than a chain. I searched the LangChain documentation with the integrated search. , in particular only in OpenAI models). [docs] def initialize_agent( tools: Sequence[BaseTool], llm: BaseLLM, agent: Optional[str] = None, callback_manager: Optional[BaseCallbackManager] = None, agent_path: Optional[str] = None, agent_kwargs: Optional[dict] = None, **kwargs: Any, ) -> AgentExecutor: """Load an agent executor given tools and LLM. Agents are systems that take a high-level task and use an LLM as a reasoning engine to decide what actions to take and execute those actions. Mar 25, 2024 · To initialize a CONVERSATIONAL_REACT_DESCRIPTION agent using the create_react_agent method in LangChain, you can follow these steps: Import the necessary modules and classes from langchain and other libraries as shown in the example. Ensure that the LLM understands when and how to invoke these tools. However, using print I would expect to see the output of the agent parsed and somehow manipulate it. llms import OpenAI from langchain. We recommend that you use LangGraph for building agents. Mar 25, 2024 · Previously I used initialize_agent method by passing agent=AgentType. langchain. abc import Sequence from typing import Any, Optional from langchain_core. agents import AgentType, initialize_agent from langchain. Before going through this notebook, please walkthrough the following notebooks, as this will build on top of both of them: Memory in LLMChain Custom Agents In order to add a memory to an agent we are going to perform the following steps: We are going to create an LLMChain with memory. mrkl. 3. 0 and will be removed in 0. Dec 9, 2024 · langchain 0. AgentOutputParser # class langchain. Jun 2, 2024 · The `initialize_agent` function is a convenience function provided by LangChain to simplify agent creation. 0 version provided a new approach of initializing agents. " ), removal="1. initialize_agent(tools: Sequence[BaseTool], llm: BaseLanguageModel, agent: Optional[AgentType] = None, callback_manager: Optional[BaseCallbackManager] = None, agent_path: Optional[str] = None, agent_kwargs: Optional[dict] = None, *, tags: Optional[Sequence[str]] = None, **kwargs: Any) → AgentExecutor [source Initializing the Agent We'll use an OpenAI chat model and an "openai-tools" agent, which will use OpenAI's function-calling API to drive the agent's tool selection and invocations. May 16, 2024 · 调用的是 initialize_agent 方法，通过 agent=xxx 来指定要创建的 Agent 类型，这个类型来自我们上面提到的 AgentType 枚举，另外还需要提供 tools 列表、LLM，其余的初始化工作会在 initialize_agent 中自动进行。 Agents are systems that take a high-level task and use an LLM as a reasoning engine to decide what actions to take and execute those actions. As we can see, the agent will first choose which tables are relevant and then add the schema for those tables and a few sample rows to the prompt. 1w次，点赞47次，收藏60次。langchain 中提供了内置工具的，但是基本不能用，除了一个计算器和一个执行 python 代码的，其他的都要 apiTool 模块相当于是使用外部工具，或者自定义工具。_langchain agent tool Dec 9, 2024 · [docs] @abstractmethodasyncdefaplan(self,intermediate_steps:List[Tuple[AgentAction,str]],callbacks:Callbacks=None,**kwargs:Any,)->Union[AgentAction,AgentFinish May 25, 2023 · Here is how you can do it. agents import load_tools from langchain. 2 the original agent helpers (initialize_agent, AgentExecutor) are deprecated and will only receive critical fixes. This walkthrough showcases using an agent to implement the ReAct logic. CONVERSATIONAL_REACT_DESCRIPTION to initialize a conversation react agent in LangChain v0. How can I initially prompt the agent with its main goal and task is? For example, you are a realtor connecting clients with agents etc. callbacks import BaseCallbackManager from langchain_core. Dec 29, 2024 · This article will walk you through designing and implementing a multi-agent system using LangChain, complete with architecture, code snippets, and a final integrated implementation. AgentExecutor 类是LangChain支持的主要代理运行时。 然而，我们还支持其他更实验性的运行时。 包括： 计划和执行代理 Baby AGI Auto GPT 入门 from langchain. May 4, 2025 · Learn how to build agentic AI systems using LangChain, including agents, memory, tool integrations, and best practices to Apr 11, 2023 · I'm building my own agent with some custom tools. import os from langchain. Set up your LangChain agent with the AgentOps callback handler, and AgentOps will automatically record your LangChain sessions. jsOptions for the agent, including agentType, agentArgs, and other options for AgentExecutor. AgentExecutor [source] # Bases: Chain Agent that is using tools. This agent uses a search tool to look up answers to the simpler questions in order to answer the original complex question. ZeroShotAgent [source] # Bases: Agent Deprecated since version 0. 0", alternative=( "Use new agent constructor methods like create_react_agent, create_json_agent, " "create_structured_chat_agent, etc. Deprecated since version 0. language_models import BaseLanguageModel from langchain_core. Jun 17, 2025 · LangChain supports the creation of agents, or systems that use LLMs as reasoning engines to determine which actions to take and the inputs necessary to perform the action. May 9, 2025 · Conclusion LangChain provides a robust framework for building AI agents that combine the reasoning capabilities of LLMs with the functional capabilities of specialized tools. Oct 29, 2024 · Build dynamic conversational agents with custom tools to enhance user interactions, delivering personalized, context-driven responses. Args: tools: List of tools this agent has access to. 26 # Main entrypoint into package. runnables import Config… agents # Agent is a class that uses an LLM to choose a sequence of actions to take. Load an agent executor given tools and LLM. g. """Load agent. memory import ConversationBufferMemory from langchain_community. fromAgentAndTools Aug 22, 2023 · 2. It incorporates the React framework to determine which tool to use and utilizes memory to remember previous conversation interactions. The function takes several parameters including tools, llm, agent, callback_manager, agent_path, agent_kwargs, tags, and **kwargs. agents import load_tools from langchain. Load the LLM First, let's load the language model we're going to Feb 20, 2025 · The below snippet is used to create an AI agent with the help of initialize_agent that will be used with tools and LLMs. . It requires the agent class, the language model, and an optional list of tools as input. load_tools: 에이전트가 사용할 도구를 로드하는 함수입니다. This is driven by a LLMChain. pull("hwchase17/openai Jan 17, 2025 · Privileged issue I am a LangChain maintainer, or was asked directly by a LangChain maintainer to create an issue here. Change the content in PREFIX, SUFFIX, and FORMAT_INSTRUCTION according to your need after tying and testing few times. agents import initialize_agent from langchain. 7) # ツールを導入します。 `llm-math` ツールを使うのに LLM を 构建 Agent 语言模型本身无法执行操作 - 它们只是输出文本。 LangChain 的一个重要用例是创建 agents。 Agents 是使用 LLM 作为推理引擎的系统，以确定要采取哪些操作以及执行操作所需的输入。执行操作后，可以将结果反馈回 LLM，以确定是否需要更多操作，或者是否可以完成。这通常通过 工具调用 实现 Dec 9, 2024 · An agent that breaks down a complex question into a series of simpler questions. This is why I initially ask how to correctly load a local model LLM and use it in the initialize_agent function of the langchain library. 2. Agents 🤖 Agents are like "tools" for LLMs. 0 doesn't seem to directly accept an output_parser argument based on the source code. Agents select and use Tools and Toolkits for actions. pydantic_v1 import BaseModel, Field from langchain_core. Google Colab is an ideal environment for prototyping LangChain agents. Aug 25, 2024 · In LangChain, an “Agent” is an AI entity that interacts with various “Tools” to perform tasks or answer queries. Parameters tools (Sequence[BaseTool]) – List of tools this agent has access to. _api import deprecated from langchain_core. from langch In Agents, a language model is used as a reasoning engine to determine which actions to take and in which order. Aug 26, 2024 · LangChain搭建Agent | 使用initialize_agent 华尔街的幻觉 已于 2024-08-26 09:41:24 修改 阅读量2. LangChainDeprecationWarning: The function `initialize_agent` was deprecated in LangChain 0. base import BaseCallbackHandler from langchain_core. In Agents, a language model is used as a reasoning engine to determine which actions to take and in which order. Class hierarchy: Sep 18, 2024 · Best Practices for Using Langchain Agents Tool Selection: Choose the right tools for your agent based on the task at hand. Use Use new agent constructor methods like create_react_agent, create_json_agent, create_structured_chat_agent, etc. initialize_agent(tools: Sequence[BaseTool], llm: BaseLanguageModel, agent: Optional[AgentType] = None, callback_manager: Optional[BaseCallbackManager] = None, agent_path: Optional[str] = None, agent_kwargs: Optional[dict] = None, *, tags: Optional[Sequence[str]] = None, **kwargs: Any) → AgentExecutor [source] ¶ Load For a quick start to working with agents, please check out this getting started guide. In this comprehensive guide, we’ll langchain. This agent uses JSON to format its outputs, and is aimed at supporting Chat Models. Conversational ReAct This agent is designed for use in conversational settings. instead. tools import Tool from langchain_openai import ChatOpenAI 加载指定工具和 LLM 的代理执行器。 参数 tools (Sequence[BaseTool]) – 本代理可访问的工具列表。 llm (基础语言模型) – 作为代理使用的主要语言模型。 agent (可选 [AgentType]) – 要使用的代理类型。如果为 None 且未设置 agent_path，则默认为 AgentType. In Chains, a sequence of actions is hardcoded. 7) # LLM ラッパーを初期化 llm = OpenAI (temperature =0. chains import LLMChain from langchain. llms import OpenAI Oct 4, 2023 · 🤖 Hello, Based on the information you provided and the context from the LangChain repository, it seems you want to instantiate an OpenAI Functions Agent with both memory and a custom system message. agents import AgentAction from langchain_openai import OpenAI # First, define custom callback handler implementations class MyCustomHandlerOne(BaseCallbackHandler): def on_llm_start( Jul 4, 2024 · Checked other resources I added a very descriptive title to this issue. callbacks. In my current code I can't seem to handle the output of the agent and the prints i wrote never happen. chat_models import ChatOpenAI from langchain. Mar 20, 2024 · ただ、上記のサイトで紹介されている"initialize_agent"を実行すると非推奨と出るように、Langchain0. For details, refer to the LangGraph documentation as well as guides for Dec 9, 2024 · Deprecated since version 0. Nov 26, 2024 · 有路过的大佬指点一二么？ 2. This is generally the most reliable way to create agents. agents import initialize_agent, Tool Mar 22, 2024 · Also, it's important to note that the initialize_agent function in LangChain version 0. """ from typing import Any, Optional, Sequence from langchain_core. agents. Code from langchain. chat_models import ChatOpenAI import os from dotenv import load_dotenv initialize_agent: 에이전트를 초기화하는 함수입니다. 1では別の書き方が推奨されます。 （もちろん'zero-shot-react-description'もなくなっています） エージェントやツールの概念は参考にできるのですが、書き方を0. agents import initialize_agent from langchain. Memory is needed to enable conversation. By leveraging agents, you can significantly enhance the capabilities of the OpenAI API and seamlessly integrate external tools. initialize. We are going to use that LLMChain to create Sep 10, 2023 · 少し余談ですが、langchainのチュートリアルによく出てくるinitialize_agent関数の戻り値はAgentではなくAgentExecutorです。 またinitialize_agentにはagentという引数を与えることができるのですが、このagentはAgentクラスではなくAgentTypeという文字列です。 Dec 5, 2023 · 起始日期 | Start Date No response 实现PR | Implementation PR No response 相关Issues | Reference Issues No response 摘要 | Summary agent调用Qwen模型的代码示例 基本示例 | Basic Example agent_open_functions = initialize_age Here we focus on how to move from legacy LangChain agents to more flexible LangGraph agents. prompts import PromptTemplate llm = OpenAI(model_name='text-davinci-003', temperature = 0. I used the GitHub search to find a similar question and di import os from langchain. 4k 收藏 3 点赞数 10 Jan 4, 2024 · The initialize_agent function is the old/initial way for accessing the agent capabilities. It can recover from errors by running a generated query, catching the traceback and regenerating it Feb 15, 2025 · This article explores LangChain’s Tools and Agents, how they work, and how you can leverage them to build intelligent AI-powered applications. agents Jun 4, 2025 · Using a Langchain agent with a local LLM offers a compelling way to build autonomous, private, and cost-effective AI workflows. Interested in discussing a Data or AI project? Feel free to reach Feb 24, 2025 · A step-by-step guide on how to build a context-aware agent that fetches real-time data, and deploy it in real-world use cases. Whether you’re an indie developer experimenting with AI apps or a company needing offline capabilities, this setup is highly customizable and production-ready with the right tooling. _api. Aug 23, 2023 · Initialize_agent not storing messages when memory is present: The issue was related to how the save_context method in the ConversationBufferMemory class was functioning. agents ¶ Agent is a class that uses an LLM to choose a sequence of actions to take. init () call, as the LangChain callback handler will automatically initialize the AgentOps client for you. 1. agents import AgentExecutor, AgentType, initialize_agent, load_tools from langchain. We'll start by installing the prerequisite libraries that we'll be using in this example. What Are LangChain Tools? Nov 6, 2024 · LangChain is revolutionizing how we build AI applications by providing a powerful framework for creating agents that can think, reason, and take actions. By understanding the core architecture — LLMs, tools, chains, memory, and the agent loop — developers can create sophisticated agents tailored to specific use cases. It was apparently deprecated in LangChain 0. 【解决方案】用initialize_agent llm就按照这篇文章配置任意一个 LangChain连接国内大模型测试|智谱ai、讯飞星火、通义千问 Apr 11, 2024 · Quickstart To best understand the agent framework, let's build an agent that has two tools: one to look things up online, and one to look up specific data that we've loaded into a index. tools import BaseTool from langchain. agent_types May 3, 2023 · From what I understand, you opened this issue to seek guidance on customizing the prompt for the zero-shot agent created using the initialize_agent function. llm: Language model to use as the Documentation for LangChain. It offers free access to GPUs and a cloud-based Python notebook interface Mar 22, 2024 · Output parser of langchain React AgentDescription I am initializing a langchain agent as seen in the code. LangGraph offers a more flexible and full-featured framework for building agents, including support for tool-calling, persistence of state, and human-in-the-loop workflows. In this example, we will use OpenAI Tool Calling to create this agent. May 8, 2025 · LangChain is a powerful framework for building agentic AI systems powered by large language models (LLMs). ZERO_SHOT_REACT_DESCRIPTION。默认为 None。 callback_manager (可选 Capturing Trajectory The easiest way to return an agent's trajectory (without using tracing callbacks like those in LangSmith) for evaluation is to initialize the agent with return_intermediate_steps=True. 0: Use Use new agent constructor methods like create_react_agent, create_json_agent, create_structured_chat_agent, etc. 1に合わせつつ、エージェントの概念を Nov 9, 2023 · Regarding the initialize_agent function in the LangChain framework, it is used to load an agent executor given a set of tools and a language model. Instead of using initialize_agent, we have to use a clearly defined method for every type. Nov 30, 2023 · The initialize_agent function is a convenience function provided by LangChain that simplifies creating an agent. In this notebook we will show how those parameters map to the LangGraph react agent executor using the create_react_agent prebuilt helper method. 0. This walkthrough showcases the self-ask with search agent. 43 power?") Jun 18, 2024 · Welcome to our latest article on Langchain agents! In this guide, we'll dive into the innovative approach to building agents introduced in Langchain update 0. In this notebook we'll explore agents and how to use them in LangChain. Below, create an example agent we will call to evaluate. 0: LangChain agents will continue to be supported, but it is recommended for new use cases to be built with LangGraph. agents import AgentType from langchain. This will assume knowledge of LLMs and retrieval so if you haven't already explored those sections, it is recommended you do so. Agent [source] # Bases: BaseSingleActionAgent Deprecated since version 0. They allow a LLM to access Google search, perform complex calculations with Python, and even make SQL queries. 0: Use new agent constructor methods like create_react_agent, create_json_agent, create_structured_chat_agent, etc. 用create_tool_calling_agent报错构建agent，这个方法是过时了吗？官方文档也没更新，官方示例也运行错误 from langchain_core. 0", ) def initialize_agent( tools: Sequence[BaseTool], llm: BaseLanguageModel, agent: Optional[AgentType] = None, callback_manager: Optional[BaseCallbackManager] = None, agent_path: Optional[str] = None, agent_kwargs """Load agent. Nov 9, 2023 · Unfortunately, the documentation of langchain only chooses example with online models (e. For an in depth explanation, please check out this conceptual Apr 28, 2025 · When I first started working with LangChain Agents, I realized pretty quickly: theory will only take you so far. You can read the docs all day long, but the real magic — and the real headaches Dec 27, 2023 · If you don’t describe the tools well, the agent won’t know how to use them properly. prompts import ChatPromptTemplate from langchain_core. For an in depth explanation, please check out this conceptual Learn how to build LangChain agents in Python. Deprecated since version 0. ZeroShotAgent # class langchain. Agent that calls the language model and deciding the action. Some language models are particularly good at writing JSON. agents import initialize_agent, load_tools from langchain. langchain: 0. run ("What is 2 raised to the 0. 7, openai_api Nov 22, 2024 · LangChain is a powerful framework designed to build AI-powered applications by connecting language models with various tools, APIs, and data sources. Setting the global debug flag will cause all LangChain components with callback support (chains, models, agents, tools, retrievers) to print the inputs they receive and outputs they generate. """ import contextlib from collections. 0 agents # Agent is a class that uses an LLM to choose a sequence of actions to take. ytzp obuta qxhkfn gwvln gwryz btfzsgf lvypc lgblp vjpd ibx