Integrating custom tools with agents

Now that you have your tools at-hand, it's time to set up your agentic workflow! You'll again be using a ReAct agent, which, recall, reasons on the steps it should take, and selects tools using this context and the tool descriptions. An llm has already been defined for you that uses OpenAI's gpt-4o-mini model

This exercise is part of the course

Developing LLM Applications with LangChain

Exercise instructions

Create a ReAct agent using create_react_agent() with llm and a list containing your retrieve_customer_info tool.
Invoke the agent with agent.invoke() on the input provided.
Print the content from the final message.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

@tool
def retrieve_customer_info(name: str) -> str:
    """Retrieve customer information based on their name."""
    customer_info = customers[customers['name'] == name]
    return customer_info.to_string()

# Create a ReAct agent
agent = create_react_agent(____, [____])

# Invoke the agent on the input
messages = agent.____({"messages": [("human", "Create a summary of our customer: Peak Performance Co.")]})
print(messages['messages'][-1].____)

Edit and Run Code

This exercise is part of the course

Developing LLM Applications with LangChain

IntermediateSkill Level

4.8+

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Welcome to the LangChain framework for building applications on LLMs! You'll learn about the main components of LangChain, including models, chains, agents, prompts, and parsers. You'll create chatbots using both open-source models from Hugging Face and proprietary models from OpenAI, create prompt templates, and integrate different chatbot memory strategies to manage context and resources during conversations.

Exercise 1: The LangChain ecosystem Exercise 2: OpenAI models in LangChain!Exercise 3: Hugging Face models in LangChain!Exercise 4: Prompt templates Exercise 5: Prompt templates and chaining Exercise 6: Chat prompt templates Exercise 7: Few-shot prompting Exercise 8: Creating the few-shot example set Exercise 9: Building the few-shot prompt template Exercise 10: Implementing few-shot prompting

Time to level up your LangChain chains! You'll learn to use the LangChain Expression Language (LCEL) for defining chains with greater flexibility. You'll create sequential chains, where inputs are passed between components to create more advanced applications. You'll also begin to integrate agents, which use LLMs for decision-making.

Exercise 1: Sequential chains Exercise 2: Building prompts for sequential chains Exercise 3: Sequential chains with LCEL Exercise 4: Introduction to LangChain agents Exercise 5: What's an agent?Exercise 6: ReAct agents Exercise 7: Custom tools for agents Exercise 8: Defining a function for tool use Exercise 9: Creating custom tools Exercise 10: Integrating custom tools with agents

Current Exercise

One limitation of LLMs is that they have a knowledge cut-off due to being trained on data up to a certain point. In this chapter, you'll learn to create applications that use Retrieval Augmented Generation (RAG) to integrate external data with LLMs. The RAG workflow contains a few different processes, including splitting data, creating and storing the embeddings using a vector database, and retrieving the most relevant information for use in the application. You'll learn to master the entire workflow!

Exercise 1: Integrating document loaders Exercise 2: PDF document loaders Exercise 3: CSV document loaders Exercise 4: HTML document loaders Exercise 5: Splitting external data for retrieval Exercise 6: Splitting by character Exercise 7: Recursively splitting by character Exercise 8: Splitting HTML Exercise 9: RAG storage and retrieval using vector databases Exercise 10: Preparing the documents and vector database Exercise 11: Building a retrieval prompt template Exercise 12: Creating a RAG chain Exercise 13: Wrap-up!