How to integrate Mailerlite MCP with Codex

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Introduction

Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With Mailerlite MCP integration, you can draft, triage, summarise emails, and much more, all without leaving the terminal or the app, whichever you prefer.

Also integrate Mailerlite with

Why use Composio?

Apart from a managed and hosted MCP server, you will get:

  • CodeAct: A dedicated workbench that allows GPT to write its code to handle complex tool chaining. Reduces to-and-fro with LLMs for frequent tool calling.
  • Large tool responses: Handle them to minimise context rot.
  • Dynamic just-in-time access to 20,000 tools across 1000+ other Apps for cross-app workflows. It loads the tools you need, so GPTs aren't overwhelmed by tools you don't need.

How to install Mailerlite MCP in Codex

Run the setup command

Run this command in your terminal to add the Composio MCP server to Codex.

Terminal

It will initiate the authentication in a browser window, authorize Codex to access your Composio account.

Composio authentication page

(Optional) Authenticate with OAuth

To authenticate manually, run the login command to open a browser window and authorize Codex to access your Composio account.

bash
codex mcp login composio

Verify the connection

Run codex mcp list to confirm Composio appears as a registered MCP server.

bash
codex mcp list

Codex App

Codex App follows the same approach as VS Code.

  1. Click ⚙️ on the bottom left → MCP Servers → + Add servers → Streamable HTTP:
  2. Fill the header and Key fields with { "x-consumer-api-key" = "ck_*******" }.
  3. The Key is the Composio API key, that you can find on dashboard.composio.dev
  4. Click on Authenticate and authorize Codex to your Composio account and you're all set.
Codex App MCP setup
  1. Restart and verify if it's there in .codex/config.toml
bash
[mcp_servers.composio]
url = "https://connect.composio.dev/mcp"
http_headers = { "x-consumer-api-key" = "ck_*******" }

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

The Mailerlite MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Mailerlite account. It provides structured and secure access to your email marketing tools, so your agent can create campaigns, manage subscribers, automate workflows, and oversee your shop integrations with ease.

  • Campaign automation and workflow management: Instruct your agent to create or delete automations, streamlining your email marketing processes and ensuring timely communication with your audience.
  • E-commerce customer and shop integration: Let your agent create, update, or remove e-commerce customers and shops for seamless sales tracking, customer onboarding, or data syncing.
  • Subscriber group and segment organization: Have your agent create custom fields, new subscriber groups, or targeted segments so you can send highly personalized campaigns.
  • Webhook registration for real-time updates: Direct your agent to set up webhooks for specific events, enabling instant notifications and integrations with other systems as actions happen in Mailerlite.
  • Efficient cleanup and management: Ask your agent to delete outdated automations, customers, or shops, helping you keep your Mailerlite workspace organized and up to date.

Supported Tools & Triggers

Tools
Add Product to CategoryTool to add a product to a category in an e-commerce shop.
Add Subscriber To GroupTool to assign an existing subscriber to a group.
Create automationCreate automation
Create CampaignTool to create a new email campaign (draft) with specified type, content, and targeting.
Create E-commerce Cart ItemTool to add an item to a shopping cart.
Create E-commerce CategoryTool to create a new product category for a shop.
Create/Update E-commerce CustomerTool to create or update a customer record for a shop.
Create E-commerce OrderTool to create a new order for a shop.
Create E-commerce ProductTool to create a new product for an e-commerce shop.
Create E-commerce ShopTool to connect a new e-commerce shop.
Create FieldTool to create a new custom field.
Create GroupTool to create a new subscriber group.
Create SegmentTool to create a new subscriber segment.
Create SubscriberTool to create or update (upsert) a subscriber by email.
Create WebhookTool to register a new webhook URL for specified event types.
Delete AutomationTool to delete an automation workflow by ID.
Delete E-commerce Cart ItemTool to remove an item from a cart in an e-commerce shop.
Delete E-commerce CategoryTool to delete a product category from an e-commerce shop by IDs.
Delete E-commerce CustomerTool to delete a customer from an e-commerce shop by IDs.
Delete E-commerce OrderTool to delete an order from a shop.
Delete E-commerce ProductTool to delete a product from an e-commerce shop by IDs.
Delete E-commerce ShopTool to disconnect an e-commerce shop by ID.
Delete FieldTool to delete a custom field.
Delete GroupTool to delete a subscriber group by ID.
Delete SegmentTool to delete a segment by ID.
Delete SubscriberTool to delete a subscriber by ID.
Delete WebhookTool to remove a webhook subscription by ID.
Execute Batch RequestTool to execute multiple API requests in a single batch call (max 50 requests).
Forget SubscriberTool to forget a subscriber completely (GDPR compliant deletion).
Get Account InfoTool to retrieve basic MailerLite account details.
Get Account StatsTool to retrieve usage statistics and performance metrics for the account.
Get AutomationTool to retrieve details of a specific automation by ID.
Get Automation ActivityTool to retrieve subscriber activity for a specific automation.
Get Campaign LanguagesTool to retrieve a list of all available campaign languages.
Get CampaignsTool to retrieve a list of all campaigns.
Get E-commerce CartTool to fetch details of a specific cart by shop ID and cart ID.
Get E-commerce Cart ItemTool to fetch details of a specific cart item by shop ID, cart ID, and item ID.
Get E-commerce CategoryTool to fetch details of a specific product category by shop and category ID.
Get E-commerce CustomerTool to fetch details of a customer by shop and customer ID.
Get E-commerce CustomersTool to list customers for a specific shop.
Get E-commerce OrderTool to fetch details of a specific e-commerce order by shop ID and order ID.
Get E-commerce ProductTool to fetch details of a specific e-commerce product by shop and product ID.
Get E-commerce ShopTool to fetch details of a specific e-commerce shop by ID.
Get E-commerce ShopsTool to list all e-commerce shops connected to the account.
Get FieldsTool to retrieve all custom fields defined in the account.
Get GroupTool to retrieve details of a specific subscriber group by ID.
Get GroupsTool to retrieve all subscriber groups.
Get Group SubscribersTool to list subscribers within a group by ID.
Get Import StatusTool to retrieve the status and detailed report of a subscriber import operation by import ID.
Get SegmentTool to retrieve a specific segment by ID.
Get SegmentsTool to retrieve all segments in the account.
Get Segment SubscribersTool to retrieve all subscribers belonging to a specific segment.
Get SubscriberTool to fetch a single subscriber by ID or email address.
Get Subscriber ActivityTool to fetch the activity log for a specific subscriber.
Get SubscribersTool to retrieve all subscribers.
Get Subscribers StatsTool to get subscriber statistics for the account.
Get WebhookTool to retrieve details of a specific webhook by ID.
Get WebhooksTool to retrieve all configured webhooks.
Import E-commerce CategoriesTool to bulk import categories to an e-commerce shop.
Import E-commerce OrdersTool to bulk import orders to an e-commerce shop.
Import E-commerce ProductsTool to bulk import products to an e-commerce shop.
Import Subscribers to GroupTool to bulk import multiple subscribers to a specific group.
List AutomationsTool to retrieve all automations in your MailerLite account.
List E-commerce Cart ItemsTool to list all items in a specific cart for an e-commerce shop.
List E-commerce CartsTool to list all carts for a specific shop.
List E-commerce CategoriesTool to list all product categories for a shop.
List E-commerce Category ProductsTool to list all products in a specific e-commerce category.
List E-commerce OrdersTool to list all orders for a specific e-commerce shop.
List E-commerce ProductsTool to list all products for a specific e-commerce shop.
List FormsTool to retrieve all forms of a specific type (popup, embedded, or promotion).
List TimezonesTool to retrieve all available timezones supported by MailerLite.
Remove Product From CategoryTool to remove a product from a category in an e-commerce shop.
Remove Subscriber From GroupTool to remove a subscriber from a group by ID.
Set Double Opt-InTool to enable or disable double opt-in for new subscribers.
Update E-commerce CartTool to update an existing cart's checkout URL or total price.
Update E-commerce Cart ItemTool to update a cart item's quantity or properties in an e-commerce cart.
Update E-commerce CategoryTool to update an existing product category in an e-commerce shop.
Update E-commerce CustomerTool to update a customer's data for a shop by IDs.
Update E-commerce OrderTool to update an existing order's status or total price in an e-commerce shop.
Update E-commerce ProductTool to update an existing product in an e-commerce shop by IDs.
Update E-commerce ShopTool to update settings of a connected e-commerce shop by ID.
Update FieldTool to update the title of an existing custom field.
Update GroupTool to update a group's name by ID.
Update SegmentTool to rename an existing segment by ID.
Update SubscriberTool to update an existing subscriber's information by ID.
Update WebhookTool to update an existing MailerLite webhook.

Conclusion

You've successfully integrated Mailerlite with Codex using Composio's MCP server. Now you can interact with Mailerlite directly from your terminal, VS Code, or the Codex App using natural language commands.

Key benefits of this setup:

  • Seamless integration across CLI, VS Code, and standalone app
  • Natural language commands for Mailerlite operations
  • Managed authentication through Composio
  • Access to 20,000+ tools across 1000+ apps for cross-app workflows
  • CodeAct workbench for complex tool chaining

Next steps:

  • Try asking Codex to perform various Mailerlite operations
  • Explore cross-app workflows by connecting more toolkits
  • Build automation scripts that leverage Codex's AI capabilities

How to build Mailerlite MCP Agent with another framework

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CrewAI

Use Mailerlite MCP with CrewAI

FAQ

What are the differences in Tool Router MCP and Mailerlite MCP?

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

Can I use Tool Router MCP with Codex?

Yes, you can. Codex 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 Mailerlite tools.

Can I manage the permissions and scopes for Mailerlite while using Tool Router?

Yes, absolutely. You can configure which Mailerlite 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.

How safe is my data with Composio Tool Router?

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 Mailerlite data and credentials are handled as safely as possible.

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