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Overview

Humanlayer integrates seamlessly with LangChain to add human oversight to your AI applications. This guide shows you how to use Humanlayer with LangChain.

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Installation

Install the required packages:

pip install humanlayer langchain langchain-openai python-dotenv

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Basic Example

Let’s create a customer onboarding assistant that sends emails with human oversight.

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How it Works

  1. We create a HumanLayer instance with a Slack contact channel for approvals
  2. Define two functions:
    • get_info_about_customer: Gets customer onboarding status
    • send_email: Sends an email (requires approval)
  3. Create LangChain tools from these functions
  4. Initialize a LangChain agent with the tools
  5. The agent will request approval before sending any emails

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Running the Example

  1. Set up your environment variables in .env
  2. Configure your Slack channel ID in the contact_channel
  3. Run the example:
python main.py

When the agent attempts to send an email, it will pause and request approval through Slack.

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Next Steps

For more framework examples, see https://github.com/humanlayer/humanlayer/tree/main/examples

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