Backend Developer

Compose and send emails using AI with human approval for sending, allowing edits or rejection before delivery.

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

Variable	Default	Description
OPENAI_MODEL	gpt-4o-mini	OpenAI model to use

Usage

typescript

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

const agent = new EmailAgent();

const dto: SendEmailDto = {
  email: '[e-mail]',
  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

Parameter	Type	Required	Description
email	string	Yes	Recipient email address
name	string	Yes	Recipient name
subject	string	No	Email subject line
body	string	No	Initial email body content
instructions	string	No	AI instructions for composing the email

Return Value

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