How to integrate Loops.so MCP with Codex

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

Loops.so logoLoops.so
Api Key

Loops.so is a modern email platform for SaaS companies to manage product, marketing, and transactional emails. It streamlines communication, so you can engage users with smarter, targeted campaigns.

12 Tools

Introduction

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

Also integrate Loops.so 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 Loops.so 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 Loops.so MCP server, and what's possible with it?

The Loops.so MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Loops.so account. It provides structured and secure access so your agent can perform Loops.so operations on your behalf.

Conclusion

You've successfully integrated Loops.so with Codex using Composio's MCP server. Now you can interact with Loops.so 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 Loops.so 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 Loops.so operations
  • Explore cross-app workflows by connecting more toolkits
  • Build automation scripts that leverage Codex's AI capabilities
TOOLS

Supported Tools

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

Create Contact

Tool to add a new contact to your Loops audience.

Create Contact Property

Tool to add a custom contact property to your Loops team.

Delete Contact

Tool to delete a contact by email address or user ID.

Find Contact

Tool to search for a contact by email or userId.

Get Contact Properties

Tool to retrieve a list of your account's contact properties from Loops.

Get Dedicated Sending IPs

Tool to retrieve a list of Loops' dedicated sending IP addresses.

Get Mailing Lists

Tool to retrieve all mailing lists associated with your Loops account.

List Custom Fields

Tool to retrieve a list of custom contact properties.

List Transactional Emails

Tool to retrieve a list of published transactional emails.

Send Event

Tool to send events to trigger emails in Loops.

Test API Key

Tool to test API key validity and retrieve team information.

Update Contact

Tool to update an existing contact by email or userId.

FAQ

Frequently asked questions

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

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 Loops.so tools.

Yes, absolutely. You can configure which Loops.so 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 Loops.so data and credentials are handled as safely as possible.

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