LangGraph.js ReAct Memory Agent

This repo provides a simple example of a ReAct-style agent with a tool to save memories, implemented in JavaScript. This is a straightforward way to allow an agent to persist important information for later use. In this implementation, we save all memories scoped to a configurable userId, enabling the bot to learn and remember a user's preferences across different conversational threads.

Getting Started

This quickstart will get your memory service deployed on LangGraph Cloud. Once created, you can interact with it from any API.

Assuming you have already installed LangGraph Studio, to set up:

1. Create a .env file.

cp .env.example .env

2. Define required API keys in your .env file.

Setup Model

The defaults values for model are shown below:

model: anthropic/claude-3-5-sonnet-20240620

Follow the instructions below to get set up, or pick one of the additional options.

Anthropic

To use Anthropic's chat models:

1. Sign up for an Anthropic API key if you haven't already.
2. Once you have your API key, add it to your .env file:

ANTHROPIC_API_KEY=your-api-key

OpenAI

To use OpenAI's chat models:

1. Sign up for an OpenAI API key.
2. Once you have your API key, add it to your .env file:

OPENAI_API_KEY=your-api-key

3. Open in LangGraph studio. Navigate to the memory_agent graph and have a conversation with it! Try sending some messages saying your name and other things the bot should remember.

Assuming the bot saved some memories, create a new thread using the + icon. Then chat with the bot again - if you've completed your setup correctly, the bot should now have access to the memories you've saved!

You can review the saved memories by clicking the "memory" button.

How it works

This chat bot reads from your memory graph's Store to easily list extracted memories. If it calls a tool, LangGraph will route to the store_memory node to save the information to the store.

How to evaluate

Memory management can be challenging to get right, especially if you add additional tools for the bot to choose between. To tune the frequency and quality of memories your bot is saving, we recommend starting from an evaluation set, adding to it over time as you find and address common errors in your service.

We have provided a few example evaluation cases in the test file here. As you can see, the metrics themselves don't have to be terribly complicated, especially not at the outset.

How to customize

1. Customize memory content: we've defined a simple memory structure content: string, context: string for each memory, but you could structure them in other ways.
2. Provide additional tools: the bot will be more useful if you connect it to other functions.
3. Select a different model: We default to anthropic/claude-3-5-sonnet-20240620. You can select a compatible chat model using provider/model-name via configuration. Example: openai/gpt-4.
4. Customize the prompts: We provide a default prompt in the prompts.ts file. You can easily update this via configuration.