Langchain tools and agents

Langchain tools and agents. Depending on what the user input (prompt) is, the agent may or may not call any of these tools, or even multiple tools in a row, until it can reason its way to the answer. LangSmith is especially useful for such cases. Building an agent from a runnable usually involves a few things: Data processing for the intermediate steps ( agent_scratchpad ). llm (BaseLanguageModel) – Language model to use as the agent. llms import HuggingFaceEndpoint. Apr 10, 2024 · Let’s build a simple agent in LangChain to help us understand some of the foundational concepts and building blocks for how agents work there. %pip install --upgrade --quiet wikipedia. model_download_counter: This is a tool that returns the most downloaded model of a given task on the Hugging Face Hub. Nov 17, 2023 · Zapier tools can be used with an agent. Oct 10, 2023 · LangChain is a versatile Python library that empowers developers and researchers to create, experiment with, and analyze language models and agents. Tool calling allows a model to respond to a given prompt by generating output that matches a user-defined schema. This is very useful when you are using LLMs to generate any form of structured data. 1. Tool use and agents. li/FmrPYIn this we look at LangChain Agents and how they enable you to use multiple Tools and Chains in a LLM app, by allowi LangChain is an open source orchestration framework for the development of applications using large language models (LLMs). Multiply these together. The code to create the ChatModel and give it tools is really simple, you can check it all in the Langchain doc. Our previous chain from the multiple tools guides actually already Colab code Notebook: https://drp. You’ll explore new advancements like ChatGPT’s function calling capability, and build a conversational agent using a new syntax called LangChain Expression Language (LCEL) for tasks like tagging, extraction, tool selection, and routing. fromAgentAndTools and providing the required input fields. The agent is an electrician named Peer. agents import initialize_agent from langchain. In this simple problem we can demonstrate adding some logic to verify intermediate The Assistants API allows you to build AI assistants within your own applications. prompts import StringPromptTemplate from langchain. You have access to a python REPL, which you can use to execute python code. Once defined, custom tools can be added to the LangChain agent using the initialize_agent() method. instructions = """You are an agent designed to write and execute python code to answer questions. llm = OpenAI (temperature = 0) Jan 23, 2024 · In this way, the supervisor can also be thought of an agent whose tools are other agents! Hierarchical Agent Teams. Mar 13, 2024 · Finally, the agent is executed with an AgentExecutor that invokes the agent for running the tools depending on the input. agent (Optional) – Agent type to use. EVAL: Elastic Versatile Agent with Langchain. Now you're ready for the next challenge: building an "agent" that acts like a tool set for your LLMs, much like a calculator aids us humans for solving math problems. "Tool calling" in this case refers to a specific type of model API Oct 2, 2023 · from typing import Any, Dict, List, Optional, Sequence, Tuple, Union from langchain. , few-shot examples) or validation for expected parameters. The examples in LangChain documentation (JSON agent, HuggingFace example) use tools with a single string input. Nov 22, 2023 · Give me a CONVERSATIONAL_REACT_DESCRIPTION code example to use these two tools, and the following requirements should be met: Use initialize_agent method to initialize the agent as needed; The output of tool2 should not be modified by LLM or further processed by the agent chain, avoiding data elimination caused by the thoughts made by LLM models; In the Chains with multiple tools guide we saw how to build function-calling chains that select between multiple tools. We construct these agents using Langchain, an essential open-source library that streamlines the development of adaptable AI agents. It is useful to have all this information because This covers basics like initializing an agent, creating tools, and adding memory. Tools are interfaces that an agent can use to interact with the world. The key to using models with tools is correctly prompting a model and parsing its response so that it chooses the right tools and provides the Oct 28, 2023 · 📁Finx_LangChain 📁1_Summarizing_long_texts 📁2_Chat_with_large_documents 📁3_Agents_and_tools 📄1_python_agent. tools (Sequence) – List of tools this agent has access to. Only use the output of your code to answer the question. **Integrate with language models**: LangChain is designed to work seamlessly with various language models, such as OpenAI's GPT-3 or Anthropic's models. agents import AgentType, initialize_agent Output Parsers. The Discord Tool gives your agent the ability to search, read, and write messages to Apr 21, 2023 · Let’s initialize an agent using initialize_agent and pass it the tools and LLM it needs. agents import Tool, AgentExecutor, LLMSingleActionAgent, AgentOutputParser from langchain. We hope to continue developing different toolkits that can enable agents to do amazing feats. There are two required inputs for an OpenAI functions agent: In addition to the tools and the chat model, we also pass a prefix prompt to add context for the model. # flake8: noqa """Tools provide access to various resources and services. It explores the components of such agents, including planning, memory, and tool use. It features a conversational memory module, ensuring Agents give decision-making powers to Large Language Models (LLMs) and decide which action(s) to take to get the best answer. Whether this agent is intended for Chat Models (takes in messages, outputs message) or LLMs (takes in string, outputs string). This interface provides two general approaches to stream content: sync stream and async astream : a default implementation of streaming that streams the final output from the chain. Parameters. An Agent can use one or multiple specific "tools". , tools that accept a single string input. create_openai_functions_agent. Available in both Python- and Javascript-based libraries, LangChain’s tools and APIs simplify the process of building LLM-driven applications like chatbots and virtual agents . Dec 12, 2023 · langchain-core contains simple, core abstractions that have emerged as a standard, as well as LangChain Expression Language as a way to compose these components together. They can be used for tasks such as grounded question/answering, interacting with APIs, or taking action. And in my opinion, for those using OpenAI's models, it's definitely the better option right now. conversational_chat. This provides even more flexibility than using LangChain AgentExecutor as the agent runtime. LangChain serves as a generic interface for In this guide, we will go over the basic ways to create Chains and Agents that call Tools. from langchain. It returns as output either an AgentAction or AgentFinish. A selection of agents to choose from. It uses LangChain's ToolCall interface to support a wider range of provider implementations, such as Anthropic, Google Gemini, and Mistral in addition to OpenAI. The tool returns the accuracy score for a pre-trained model saved at a given path. Next, we will use the high level constructor for this type of agent. It simplifies the process of programming and integration with external data sources and software workflows. This package is now at version 0. We'll use the tool calling agent, which is generally the most reliable kind and the recommended one for most use cases. py 📄. prompt attribute of the agent with your own prompt. agent import AgentExecutor from langchain. It takes as input all the same input variables as the prompt passed in does. env First of all, open a terminal and run the following command to install two Python packages we’ll use: Important LangChain primitives like LLMs, parsers, prompts, retrievers, and agents implement the LangChain Runnable Interface. Schema of what the inputs to the tool are. This step shows an instance in which an agent can actually issue queries, be it for greeting the user or getting certain information. Agents. agents. Read about all the agent types here. These agents can be configured with specific behaviors and data sources and trained to perform various language Memory in Agent. info. 3) ToolMessage: contains confirmation to the model that the model requested a tool correctly. In this guide, we will go over the basic ways to create Chains and Agents that call Tools. py 📄2_internet_search_agent. Apr 4, 2023 · The agent’s tools — Here, we will equip the agent with a Search Ticketmaster tool for discovering events and a “Bad Bunny rap” tool that allows users to request a rap in Bad Bunny’s style on any topic. Whether the result of a tool should be returned directly to the user. langchain: Chains, agents, and retrieval strategies that make up an application's cognitive architecture. Here’s a working Huggingface Tools that supporting text I/O can be loaded directly using the load_huggingface_tool function. Examples: Python; JS; This is similar to the above example, but now the agents in the nodes are actually other langgraph objects themselves. Mar 26, 2023 · Agents in LangChain are systems that use a language model to interact with other tools. Some applications require an unknown chain that depends on the user's input, and agents can be used to facilitate this process. These integrations allow developers to create versatile applications that combine the power Agents. Subclassing the BaseTool class provides more control over the tool’s behaviour and defines custom instance variables or propagates callbacks. See Oct 25, 2023 · Enroll today: https://bit. Bases: Agent. agents import AgentExecutor. This minor change makes the agent aware of the knowledge given Welcome to LangChain — 🦜🔗 LangChain 0. The list of messages per example corresponds to: 1) HumanMessage: contains the content from which content should be extracted. After taking this course, you’ll know how to: - Generate structured output, including function calls Use with regular LLMs, not with chat models. ChatOpenAI. We're putting the initial version of this in the experimental module as we expect rapid changes. Jul 6, 2023 · The suggested solution is: Use a router chain (RC) which can dynamically select the next chain to use for a given input. Oct 31, 2023 · You've already dipped your toes into generative AI, exploring large language models (LLMs), and prompt engineering. from langchain_community. To demonstrate the AgentExecutorIterator functionality, we will set up a problem where an Agent must: Retrieve three prime numbers from a Tool. from_function() method lets you quickly create a tool from a simple function. However, what is novel about this type of interaction is that the two agents are poised as equals - in previous LangChain implementations there has always been one agent which calls the other as a tool, in a "stacking" approach. The function to call. A good example of this is an agent tasked with doing question-answering over some sources. The Dall-E tool allows your agent to create images using OpenAI's Dall-E image generation tool. langchain-community contains all third party integrations. There are two main types of router chains: LLM Router Chains and Embedding Router Chains. It offers a rich set of features for natural Feb 20, 2024 · Here, we will discuss how to implement a JSON-based LLM agent. See the example below. Below is a list of some of the tools available to LangChain agents. LangChain comes with a number of built-in agents that are optimized for different use cases. Jun 15, 2023 · The more tools are available to an Agent, the more actions can be taken by the Agent. I've played around with OpenAI's Function Calling and I've found it a lot faster and easier to use than the tools and agent options provided by LangChain. agent_executor = AgentExecutor(agent=agent Apr 18, 2023 · Given the modular nature of LangChain, we have long been proponents of having agents use other agents as tools. tools import WikipediaQueryRun. In agents, a language model is used as a reasoning… 6 min read · Apr 17, 2024 The LangChain library provides a substantial selection of prebuilt tools. e. It also highlights the challenges and limitations of using LLMs in agent systems. If you get an error, debug your code and try again. This makes debugging these systems particularly tricky, and observability particularly important. If None and agent_path is also None, will default to AgentType. Now, we can initalize the agent with the LLM, the prompt, and the tools. memory = AgentExecutor(agent=agent, tools=tools, verbose Oct 31, 2023 · Agents. Memory is needed to enable conversation. Using tools allows the model to request that more than one function will be called upon when appropriate. agents import tool from datetime import date We also write a function called “time”, which takes in any text string. Let’s look into each of the inputs. May 10, 2023 · Plan-and-Execute agents are heavily inspired by BabyAGI and the recent Plan-and-Solve paper. Tools can be just about anything — APIs, functions, databases, etc. It returns today’s date by calling DateTime. Under the hood, the LangChain SQL Agent uses a MRKL (pronounced Miracle)-based approach, and queries the database schema and example rows and uses these to generate SQL queries, which it then executes to pull back the results you're asking for. You can interact with OpenAI Assistants using May 25, 2023 · Here is how you can do it. Using agents. Choosing between multiple tools. 0. Tool calling is only available with supported models. 190 Redirecting Sep 12, 2023 · Depending on the user input, the agent can then decide which, if any, of these tools to call. We’ll focus on Chains since Agents can route between multiple tools by default. The key to using models with tools is correctly prompting a model and parsing its Use LCEL, which simplifies the customization of chains and agents, to build applications; Apply function calling to tasks like tagging and data extraction; Understand tool selection and routing using LangChain tools and LLM function calling – and much more. “Tool calling” in this case refers to a specific type of model 📄️ Connery Action Tool. In our Quickstart we went over how to build a Chain that calls a single multiply tool. Start applying these new capabilities to build and improve your applications today. The score_tool is a tool I define for the LLM that uses a function named llm Returning Structured Output. Custom tools in LangChain provide task-specific functionality and flexibility, allowing users to define LangChain is an open-source framework designed for developing applications that utilize large language models (LLMs). name (str), is required and must be unique within a set of tools provided to an agent description (str), is optional but recommended, as it is used by an agent to determine tool use args_schema (Pydantic BaseModel), is optional but recommended, can be used to provide more information (e. Aug 2, 2023 · We will first import the tool decorator for this. import os from langchain. Nov 30, 2023 · The Tool. 0: Use create_json_chat_agent instead. In LangChain, an agent is an entity that can understand and generate text. Links: Apr 7, 2024 · Deploying agents with Langchain is a straightforward process, though it is primarily optimized for integration with OpenAI’s API. This notebook goes over adding memory to an Agent. 📄️ Dall-E Tool. LangChain is great for building such interfaces because it has: Good model output parsing, which makes it easy to extract JSON, XML, OpenAI function-calls, etc Apr 11, 2024 · By definition, agents take a self-determined, input-dependent sequence of steps before returning a user-facing output. For our example, we are using the same math-solving tool as above, called pal-math . It can often be useful to have an agent return something with more structure. chat **Choose the appropriate components**: Based on your use case, select the right LangChain components, such as agents, chains, and tools, to build your application. There’s a long list of tools available here that an agent can use to interact with the outside world. Change the content in PREFIX, SUFFIX, and FORMAT_INSTRUCTION according to your need after tying and testing few times. load_tools. These need to represented in a way that the language model can recognize them. For an in depth explanation, please check out this conceptual guide. 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). In this example, we will use OpenAI Tool Calling to create this agent. Examples of end-to-end agents. Before going through this notebook, please walkthrough the following notebooks, as this will build on top of both of them: 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. An Assistant has instructions and can leverage models, tools, and knowledge to respond to user queries. The main thing this affects is the prompting strategy used. base. . Tools in the semantic layer. You can pass a Runnable into an agent. Tools allow us to extend the capabilities of a model beyond just outputting text/messages. langchain-openai, langchain-anthropic, etc. Besides having a large collection of different types of output parsers, one distinguishing benefit of LangChain OutputParsers is that 2 days ago · A Runnable sequence representing an agent. By keeping it simple we can get a better grasp of the foundational ideas behind these agents, allowing us to build more complex agents in the future. prompts import Apr 27, 2023 · More recently, LangChain has also introduced the concept of “Agents”: a special chain with access to a suite of tools that can decide which tools to call, depending on the user input. We think Plan-and-Execute is great for more complex long term planning, at the cost of more calls to the language model. chains import LLMChain from typing import List, Union from langchain. I have the python 3 langchain code below that I'm using to create a conversational agent and define a tool for it to use. When building with LangChain, all steps will automatically be traced in LangSmith. By supplying the model with a schema that matches up with a LangChain tool’s signature, along with a name and description of what the tool does, we This project integrates Neo4j graph databases with LangChain agents, using vector and Cypher chains as tools for effective query processing. It can recover from errors by running a generated Agents. Agents let us do just this. LlamaIndex forms part of this list of tools, with LlamaIndex acting as a framework to access and search different types of data. will execute all your requests. ZERO_SHOT_REACT_DESCRIPTION. Since the tools in the semantic layer use slightly more complex inputs, I had to dig a little deeper. LangChain has a SQL Agent which provides a more flexible way of interacting with SQL Databases than a chain. 7, openai_api LangChain's tools/agents vs OpenAI's Function Calling. llms import OpenAI from langchain. The article provides case studies and proof-of-concept examples of LLM-powered agents in various domains, such as scientific discovery and generative agents simulation. Agent Types There are many different types of agents to use. In some situations, this can help signficantly reduce the time that it takes an agent to achieve its goal. This is a more generalized version of the OpenAI tools agent, which was designed for OpenAI's specific style of tool calling. The system employs advanced retrieval strategies, enhancing the precision and relevance of information extracted from both vector and graph databases. The Assistants API currently supports three types of tools: Code Interpreter, Retrieval, and Function calling. . First, you need to install wikipedia python package. agents import Tool, ZeroShotAgent, LLMSingleActionAgent 3 days ago · [Deprecated] Load an agent executor given tools and LLM. However, in many real-world projects, we’ll often find that only so many requirements can be satisfied by existing tools. agents import AgentType, initialize_agent, load_tools from langchain_openai import OpenAI. Partner packages (e. Jun 18, 2023 · The AgentExecutor constructor sets the following properties: You can create an AgentExecutor using AgentExecutor. ly/3QEhuTnOur latest course, Functions, Tools, and Agents with LangChain, will help you stay ahead in the rapidly evolving race of Tools. Using this tool, you can integrate individual Connery Action into your LangChain agent. Deprecated since version 0. The agent is responsible for taking in input and deciding what actions to take. Today, we're announcing agent toolkits, a new abstraction that allows developers to create agents designed for a particular use-case (for example, interacting with a relational database or interacting with an OpenAPI spec). Now let’s take a look at how we might augment this chain so that it can pick from a number of tools to call. We will first create it WITHOUT memory, but we will then show how to add memory in. By default, most of the agents return a single string. Tool decorator can be applied to any function and the function gets converted into a tool that LangChain can use. 3 days ago · class langchain. that can be fed into a chat model. This chapter will explore how to build custom tools for agents in LangChain. The model is scored on data that is saved at another path. Mar 1, 2023 · 3 min read Mar 1, 2023. 2) AIMessage: contains the extracted information from the model. Notes. Setup LangChain provides integrations for over 25 different embedding methods, as well as for over 50 different vector storesLangChain is a tool for building applications using large language models (LLMs) like chatbots and virtual agents. Observe: react to the response of the tool call by either calling another function or responding to Jul 11, 2023 · A LangChain agent uses tools (corresponds to OpenAPI functions). This categorizes all the available agents along a few dimensions. You can use an agent with a different type of model than it is intended Jan 24, 2024 · Running agents with LangChain. Wikipedia is the largest and most-read reference work in history. 5. This notebook covers how to have an agent return a structured output. Feb 13, 2024 · LLM agents typically have the following main steps: Propose action: the LLM generates text to respond directly to a user or to pass to a function. Use LCEL, which simplifies the customization of chains and agents, to build applications; Apply function calling to tasks like tagging and data extraction; Understand tool selection and routing using LangChain tools and LLM function calling – and much more. To start, we will set up the retriever we want to use, and then turn it into a retriever tool. Concepts There are several key concepts to understand when building agents: Agents, AgentExecutor, Tools, Toolkits. Jan 12, 2024 · 1. Crucially, the Agent does not execute those actions - that is done by the AgentExecutor (next step). LangChain offers a number of tools and functions that allow you to create SQL Agents which can provide a more flexible way of interacting with SQL databases. LangChain has a large ecosystem of integrations with various external resources like local and remote file systems, APIs and databases. agents import AgentExecutor, create_tool_calling_agent, tool from langchain_anthropic import ChatAnthropic from langchain_core. tools import BaseTool from langchain. agents import load_tools from langchain. An exciting use case for LLMs is building natural language interfaces for other "tools", whether those are APIs, functions, databases, etc. Here is an example input for a Tool calling agent. Let’s use an analogy for clarity. The framework offers a standardized interface for constructing chains, a multitude of integrations with various tools, and pre-built end-to-end chains tailored for common applications. ConversationalChatAgent [source] ¶. ): Some integrations have been further split into their own lightweight packages that only depend on langchain-core. wikipedia = WikipediaQueryRun(api_wrapper=WikipediaAPIWrapper()) Oct 15, 2023 · The agent is documented in the agent loop. LangChain provides: A standard interface for agents. This is an agent specifically optimized for doing retrieval when necessary and also holding a conversation. See AgentTypes documentation for more agent types. Output parsers are responsible for taking the output of an LLM and transforming it to a more suitable format. LangChain (v0. Execute action: your code invokes other software to do things like query a database or call an API. 1 and all breaking changes will be accompanied by a minor version bump. This should be pretty tightly coupled to the instructions in the prompt. Intended Model Type. Some models, like the OpenAI models released in Fall 2023, also support parallel function calling, which allows you to invoke multiple functions (or the same function multiple times) in a single model call. ‍LangChain agents are specialized components within the LangChain framework that interact Quickstart. Use only with unstructured tools; i. It takes the name of the category (such as text-classification, depth-estimation, etc), and returns the name of the langchain-community: Third party integrations. 📄️ Discord Tool. schema import AgentAction, AgentFinish, OutputParserException from langchain. Auto-evaluator: a lightweight evaluation tool for question-answering using Langchain ; Langchain visualizer: visualization and debugging tool for LangChain workflows ; LLM Strategy: implementing the Strategy Pattern using LLMs If you're creating agents using OpenAI models, you should be using this OpenAI Tools agent rather than the OpenAI functions agent. We’ll use the tool calling agent, which is generally the most reliable kind and the recommended one for most use cases. It can be useful to run the agent as an iterator, to add human-in-the-loop checks as needed. Meaning we must modify existing tools or build entirely new ones. g. This is generally the most reliable way to create agents. For more information about how to thing about these components, see our conceptual guide. We have just integrated a ChatHuggingFace wrapper that lets you create agents based on open-source models in 🦜🔗LangChain. Change the llm_chain. Sep 24, 2023 · Custom tools are a critical component when creating an agent using the LangChain framework. [ Deprecated] An agent designed to hold a conversation in addition to using tools. A description of what the tool is. utilities import WikipediaAPIWrapper. Contents. prompts import PromptTemplate llm = OpenAI(model_name='text-davinci-003', temperature = 0. May 1, 2024 · Source code for langchain. Custom agent. This notebook goes through how to create your own custom agent. They combine a few things: The name of the tool. 220) comes out of the box with a plethora of tools which allow you to connect to all kinds of paid and free Nov 30, 2023 · Agents in LangChain are systems that use a language model to interact with other tools. The main advantages of using SQL Agents are: It can answer questions based on the databases schema as well as on the databases content (like describing a specific table). yf cm le fw xv ot dh ev cd ye