How to integrate Emailoctopus MCP with Claude Agent SDK

This guide walks you through connecting Emailoctopus to the Claude Agent SDK using the Composio tool router. By the end, you'll have a working Emailoctopus agent that can add new subscribers to your newsletter list, unsubscribe a user from marketing emails, list all recent email campaigns sent through natural language commands. This guide will help you understand how to give your Claude Agent SDK agent real control over a Emailoctopus account through Composio's Emailoctopus MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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EmailOctopus is a straightforward email marketing platform for creating, sending, and analyzing campaigns. It helps you grow and engage your audience with affordable, easy-to-use tools.

20 Tools

Introduction

This guide walks you through connecting Emailoctopus to the Claude Agent SDK using the Composio tool router. By the end, you'll have a working Emailoctopus agent that can add new subscribers to your newsletter list, unsubscribe a user from marketing emails, list all recent email campaigns sent through natural language commands.

This guide will help you understand how to give your Claude Agent SDK agent real control over a Emailoctopus account through Composio's Emailoctopus MCP server.

Before we dive in, let's take a quick look at the key ideas and tools involved.

Also integrate Emailoctopus with

OpenAI Agents SDKClaude CodeClaude CoworkCodexOpenClawHermesCLIGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAI

TL;DR

Here's what you'll learn:
  • Get and set up your Claude/Anthropic and Composio API keys
  • Install the necessary dependencies
  • Initialize Composio and create a Tool Router session for Emailoctopus
  • Configure an AI agent that can use Emailoctopus as a tool
  • Run a live chat session where you can ask the agent to perform Emailoctopus operations

What is Claude Agent SDK?

The Claude Agent SDK is Anthropic's official framework for building AI agents powered by Claude. It provides a streamlined interface for creating agents with MCP tool support and conversation management.

Key features include:

  • Native MCP Support: Built-in support for Model Context Protocol servers
  • Permission Modes: Control tool execution permissions
  • Streaming Responses: Real-time response streaming for interactive applications
  • Context Manager: Clean async context management for sessions

What is the Emailoctopus MCP server, and what's possible with it?

The Emailoctopus MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Emailoctopus account. It provides structured and secure access to your subscriber lists, contacts, and campaigns, so your agent can perform actions like managing lists, adding contacts, launching campaigns, and handling unsubscriptions on your behalf.

  • Seamless contact management: Your agent can create new contacts, update details, or remove subscribers from your marketing lists in seconds.
  • Mailing list creation and organization: Effortlessly set up new mailing lists and keep your audience segmented for targeted campaigns.
  • Campaign insights and retrieval: Instantly access details about your recent email campaigns, including summaries and performance data.
  • Automated unsubscriptions and compliance: Quickly unsubscribe contacts or delete them to keep your lists clean and privacy-compliant.
  • Bulk list management: Retrieve and organize all mailing lists in your account, making it easy to scale and update your marketing efforts.

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

Composio's Composio SDK helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Composio SDK

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Composio SDK works

The Composio SDK follows a three-phase workflow:

  1. Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
  2. Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
  3. Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Step by step09 STEPS
1

Prerequisites

Before starting, make sure you have:
  • Composio API Key and Claude/Anthropic API Key
  • Primary know-how of Claude Agents SDK
  • A Emailoctopus account
  • Some knowledge of Python
2

Getting API Keys for Claude/Anthropic and Composio

Claude/Anthropic API Key
  • Go to the Anthropic Console and create an API key. You'll need credits to use the models.
  • Keep the API key safe.
Composio API Key
  • Log in to the Composio dashboard.
  • Navigate to your API settings and generate a new API key.
  • Store this key securely as you'll need it for authentication.
3

Install dependencies

npm install @anthropic-ai/claude-agent-sdk @composio/core dotenv

Install the Composio SDK and the Claude Agents SDK.

What's happening:

  • @composio/core provides Composio integration for Anthropic
  • @anthropic-ai/claude-agent-sdk is the core agent framework
  • dotenv/config loads environment variables
4

Set up environment variables

bash
COMPOSIO_API_KEY=your_composio_api_key_here
USER_ID=your_user_id_here
ANTHROPIC_API_KEY=your_anthropic_api_key_here

Create a .env file in your project root.

What's happening:

  • COMPOSIO_API_KEY authenticates with Composio
  • USER_ID identifies the user for session management
  • ANTHROPIC_API_KEY authenticates with Anthropic/Claude
5

Import dependencies

import 'dotenv/config';
import readline from 'node:readline';
import { Composio } from '@composio/core';
import { query, type Options } from "@anthropic-ai/claude-agent-sdk";

dotenv.config();
What's happening:
  • We're importing all necessary libraries including the Claude Agent SDK and Composio
  • The dotenv.config() function loads environment variables from your .env file
  • This setup prepares the foundation for connecting Claude with Emailoctopus functionality
6

Create a Composio instance and Tool Router session

async function chat() {
  const { COMPOSIO_API_KEY, USER_ID } = process.env;
  if (!COMPOSIO_API_KEY || !USER_ID) {
    throw new Error('COMPOSIO_API_KEY and USER_ID required in .env');
  }

  const composio = new Composio({ apiKey: COMPOSIO_API_KEY });

  // Create Tool Router session for Emailoctopus
  const session = await composio.create(USER_ID, {
    toolkits: ['emailoctopus'],
  });
  const mcpUrl = session?.mcp.url;
What's happening:
  • The function checks for the required COMPOSIO_API_KEY environment variable
  • We're creating a Composio instance using our API key
  • The create method creates a Tool Router session for Emailoctopus
  • The returned url is the MCP server URL that your agent will use
7

Configure Claude Agent with MCP

const options: Options = {
  permissionMode: 'bypassPermissions',
  mcpServers: {
    composio: {
      type: 'http',
      url: mcpUrl,
      headers: { 'x-api-key': COMPOSIO_API_KEY }
    }
  },
  systemPrompt: 'You are a helpful assistant with access to Emailoctopus tools via Composio.',
  maxTurns: 10,
};
What's happening:
  • We're configuring the Claude Agent options with the MCP server URL
  • permissionMode: 'bypassPermissions' allows the agent to execute operations without asking for permission each time
  • The system prompt instructs the agent that it has access to Emailoctopus
  • maxTurns: 10 limits the conversation length to prevent excessive API usage
8

Create client and start chat loop

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: 'You: '
  });

  console.log('\nChat started. Type "exit" to quit.\n');

  let isProcessing = false;

  async function ask(prompt: string) {
    isProcessing = true;
    rl.pause();

    process.stdout.write('Claude is thinking...');
    const stream = query({ prompt, options });

    let firstChunk = true;
    for await (const msg of stream) {
      const content = (msg as any).message?.content || (msg as any).content;
      if (Array.isArray(content)) {
        for (const block of content) {
          if (block.type === 'text' && block.text) {
            if (firstChunk) {
              process.stdout.write('\r\x1b[K');
              process.stdout.write('Claude: ');
              firstChunk = false;
            }
            process.stdout.write(block.text);
          }
        }
      }
    }
    process.stdout.write('\n\n');

    isProcessing = false;
    rl.resume();
    rl.prompt();
  }

  rl.on('line', async (line) => {
    if (isProcessing) return;

    const input = line.trim();
    if (input === 'exit') {
      rl.close();
      process.exit(0);
    }
    if (input) await ask(input);
    else rl.prompt();
  });

  await ask('What can you help me with?');
}
What's happening:
  • The readline interface is created to handle user input and output
  • The query function is used to send the user's input to the agent
  • The chat loop continues until the user types 'exit' or 'quit'
9

Run the application

try {
  await chat();
} catch (error) {
  console.error(error);
  process.exit(1);
}
What's happening:
  • The chat function is the entry point for the application
  • The try-catch block is used to handle any errors that occur

Complete Code

Here's the complete code to get you started with Emailoctopus and Claude Agent SDK:

import 'dotenv/config';
import readline from 'node:readline';
import { Composio } from '@composio/core';
import { query, type Options } from "@anthropic-ai/claude-agent-sdk";

async function chat() {
  const { COMPOSIO_API_KEY, USER_ID } = process.env;
  if (!COMPOSIO_API_KEY || !USER_ID) {
    throw new Error('COMPOSIO_API_KEY and USER_ID required in .env');
  }

  const composio = new Composio({ apiKey: COMPOSIO_API_KEY });
  const session = await composio.create(USER_ID, {
    toolkits: ['emailoctopus']
  });
  const mcp_url = session?.mcp.url;

  const options: Options = {
    permissionMode: 'bypassPermissions',
    mcpServers: {
      composio: {
        type: 'http',
        url: mcp_url,
        headers: { 'x-api-key': COMPOSIO_API_KEY }
      }
    },
    systemPrompt: 'You are a helpful assistant with access to Emailoctopus tools via Composio.',
    maxTurns: 10,
  };

  const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: 'You: '
  });

  console.log('\nChat started. Type "exit" to quit.\n');

  let isProcessing = false;

  async function ask(prompt: string) {
    isProcessing = true;
    rl.pause();

    process.stdout.write('Claude is thinking...');
    const stream = query({ prompt, options });

    let firstChunk = true;
    for await (const msg of stream) {
      const content = (msg as any).message?.content || (msg as any).content;
      if (Array.isArray(content)) {
        for (const block of content) {
          if (block.type === 'text' && block.text) {
            if (firstChunk) {
              process.stdout.write('\r\x1b[K');
              process.stdout.write('Claude: ');
              firstChunk = false;
            }
            process.stdout.write(block.text);
          }
        }
      }
    }
    process.stdout.write('\n\n');

    isProcessing = false;
    rl.resume();
    rl.prompt();
  }

  rl.on('line', async (line) => {
    if (isProcessing) return;

    const input = line.trim();
    if (input === 'exit') {
      rl.close();
      process.exit(0);
    }
    if (input) await ask(input);
    else rl.prompt();
  });

  await ask('What can you help me with?');
}

try {
  await chat();
} catch (error) {
  console.error(error);
  process.exit(1);
}

Conclusion

You've successfully built a Claude Agent SDK agent that can interact with Emailoctopus through Composio's Tool Router.

Key features:

  • Native MCP support through Claude's agent framework
  • Streaming responses for real-time interaction
  • Permission bypass for smooth automated workflows
You can extend this by adding more toolkits, implementing custom business logic, or building a web interface around the agent.
TOOLS

Supported Tools

Every Emailoctopus action and event your agent gets out of the box.

Create Contact

This tool creates a new contact in EmailOctopus.

Create Field

Tool to create a new custom field on an EmailOctopus mailing list.

Create List

Creates a new mailing list in EmailOctopus for organizing and managing email contacts.

Create Tag

Tool to create a new tag on an EmailOctopus mailing list.

Delete Contact

Permanently deletes a contact from a specified EmailOctopus list.

Delete Field

Permanently deletes a custom field from a specified EmailOctopus list.

Delete List

This tool allows you to delete an existing mailing list from your EmailOctopus account.

Delete Tag

Tool to delete a tag from a mailing list in EmailOctopus.

Get All Lists

This tool retrieves all the mailing lists associated with the EmailOctopus account.

Get Contact

Tool to retrieve details of a specific contact from an EmailOctopus list.

Get List

Retrieves details of a specific mailing list by ID.

Get Recent Campaigns

This tool retrieves a list of recent campaigns from the EmailOctopus account.

List Contacts

Tool to retrieve contacts from an EmailOctopus list.

List Tags

Tool to retrieve all tags from a mailing list.

Unsubscribe Contact

Unsubscribes a contact from an EmailOctopus mailing list.

Batch Update Contacts

Tool to update multiple contacts in an EmailOctopus list in a single batch operation.

Update Field

Updates an existing custom field on an EmailOctopus list including its label, tag, type, and fallback value.

Update List

Tool to update an existing mailing list's name in EmailOctopus.

Update Tag

Tool to update an existing tag on a mailing list.

Create or Update Contact

Tool to create or update a contact in EmailOctopus.

FRAMEWORKS

How to build Emailoctopus MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Emailoctopus MCP with OpenAI Agents SDK

Claude Code logo

Claude Code

Use Emailoctopus MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Emailoctopus MCP with Claude Cowork

Codex logo

Codex

Use Emailoctopus MCP with Codex

OpenClaw logo

OpenClaw

Use Emailoctopus MCP with OpenClaw

Hermes logo

Hermes

Use Emailoctopus MCP with Hermes

CLI logo

CLI

Use Emailoctopus MCP with CLI

Google ADK logo

Google ADK

Use Emailoctopus MCP with Google ADK

LangChain logo

LangChain

Use Emailoctopus MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Emailoctopus MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Emailoctopus MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Emailoctopus MCP with LlamaIndex

CrewAI logo

CrewAI

Use Emailoctopus MCP with CrewAI

FAQ

Frequently asked questions

With a standalone Emailoctopus MCP server, the agents and LLMs can only access a fixed set of Emailoctopus tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Emailoctopus and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Claude Agent SDK fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Emailoctopus tools.

Yes, absolutely. You can configure which Emailoctopus scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Emailoctopus data and credentials are handled as safely as possible.

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