Using graph memory for conversation

Now that your chatbot has access to memory, you can stream its responses to follow up questions. Note that your follow up questions will need no extra context as the chatbot can access the full conversation stored in its memory. The questions have already been set up for you.

This exercise is part of the course

Designing Agentic Systems with LangChain

Exercise instructions

Create a config dictionary with "configurable", containing "thread_id" set to "single_session_memory".
Loop through each graph event, applying the .stream() method to graph, passing a dictionary with "messages" containing the user_input labeled "user" and the config dictionary.
Loop through event.values() using value and print "Agent:" followed by "messages" if it exists in value and is not empty.

Hands-on interactive exercise

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

# Set up a streaming function for a single user
def stream_memory_responses(user_input: str):
    ____ = {"____": {"____": "____"}}
    
    # Stream the events in the graph
    for ____ in graph.____({"messages": [("user", ____)]}, ____):
        
        # Return the agent's last response
        for ____ in event.____():
            if "messages" in ____ and value["____"]:
                print("Agent:", value["messages"])

stream_memory_responses("Tell me about the Eiffel Tower.")
stream_memory_responses("Who built it?")

Edit and Run Code

This exercise is part of the course

Designing Agentic Systems with LangChain

IntermediateSkill Level

4.8+

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Build intelligent agentic systems! Discover the key components of LangChain agents, including how prompts, LLMs, and tools work together for reasoning and action. You'll set up an agent with OpenAI's API, define custom tools, and tackle real-world tasks like math calculations. Plus, explore how LangChain organizes data using graphs, nodes, and edges.

Exercise 1: Agents in LangChain Exercise 2: Creating a ReAct agent Exercise 3: Components of LangChain agents Exercise 4: Building custom tools Exercise 5: Create a tool for math calculations Exercise 6: Integrating custom tools and queries Exercise 7: Conversation with a ReAct agent Exercise 8: Conversation setup Exercise 9: Ask questions about conversation history

Build dynamic, tool-augmented chatbots with LangChain and LangGraph! You’ll explore how to create a chatbot that adapts based on user input by defining states and integrating external APIs for real-time information retrieval. You'll connect these components into a responsive graph structure, enabling smooth transitions between conversation and tool-assisted responses. By the end, you’ll have a visually represented chatbot framework with enhanced reasoning and multi-step workflows.

Exercise 1: Building graphs for chatbots Exercise 2: Graph and agent states Exercise 3: Adding nodes and edges Exercise 4: Generating chatbot responses Exercise 5: Queries and responses Exercise 6: Generate a graph diagram Exercise 7: Adding external tools to a chatbot Exercise 8: Build a Wikipedia tool Exercise 9: Add a tool to a graph Exercise 10: Adding memory and conversation Exercise 11: Visualize the graph and return tool outputs Exercise 12: Adding graph memory Exercise 13: Using graph memory for conversation

Current Exercise

Expand your chatbot with dynamic tools and memory! Define and integrate multiple tools into flexible workflows, build functions for dynamic tool calling, and configure your chatbot for multiple-tool handling. Organize memory and outputs to enable interleaved, multi-turn conversations. By the end, you'll have created a sophisticated chatbot capable of complex interactions.

Exercise 1: Defining multiple tools Exercise 2: Build a tool that invokes the LLM Exercise 3: Build a tool with Python code Exercise 4: Binding multiple tools Exercise 5: Defining nodes and edges for flexible function calling Exercise 6: Define a function that stops the chatbot Exercise 7: Create a function to return an LLM response Exercise 8: Create the graph workflow for multiple tools Exercise 9: Organize chatbot outputs with memory Exercise 10: Configure outputs for multiple tools Exercise 11: Enable multi-turn conversation with memory Exercise 12: Congratulations!