Langchain Email Agent

EmailAgent README

Overview

The EmailAgent class provides an AI-powered email composition and sending capability using LangChain with OpenAI's GPT model. It includes human-in-the-loop middleware that requires approval before emails are sent.

Configuration

Environment Variables

Usage

import { EmailAgent } from './email.agent';
import { SendEmailDto } from '../dto/send-email.dto';

const agent = new EmailAgent();

const dto: SendEmailDto = {
  email: 'recipient@example.com',
  name: 'John Doe',
  subject: 'Meeting Request',      // optional
  body: 'Initial email content',   // optional
  instructions: 'Keep it formal'   // optional
};

const result = await agent.sendEmail(dto);

Human-in-the-Loop Middleware

The agent uses humanInTheLoopMiddleware which interrupts execution on the EmailTool before sending emails. This allows for:

• approve - Send the email as composed
• edit - Modify the email before sending
• reject - Cancel the email operation

The readEmailTool is excluded from interruption (false), allowing read operations to proceed without approval.

Parameters

Return Value

Returns the final message content from the agent as a string.