How to integrate Simplero MCP with Atomic Agent

Connect Atomic Agent to Simplero MCP. List all active contacts in simplero, send a broadcast email to your list, and more using natural language, with authentication handled for you.

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19 Tools

Introduction

Atomic Agent is an open-source AI agent that runs on your machine and supports local models through llama.cpp. Connect it to 1,500+ apps through Composio, including Simplero.

This guide uses Atomic Agent's built-in Composio integration. You need Atomic Agent v0.5.6 or later, your own Composio API key, and a Simplero account. See the Atomic Agent documentation for installation instructions.

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How Atomic Agent connects to Simplero

Atomic Agent connects to Composio's Tool Router over Streamable HTTP MCP. It discovers the tools needed for your request, and Composio handles account authentication.

Execution and account-connection tools follow Atomic Agent's configured approval policy. Review any approval prompt before allowing an action on your connected account.

Connect Simplero to Atomic Agent

  1. Sign up or sign in to the Composio dashboard. Copy your API key.
  2. In Atomic Agent, open the Integrations tab and select Composio. Select API key, press e, paste the key, and press Enter. The tools become available immediately, without a restart.
  3. Ask Atomic Agent to do something in Simplero. It searches Composio for the right tool.
  4. On first use, open the sign-in link returned in the chat. Connect your Simplero account, then return to Atomic Agent to continue.

Headless setup

Add the following line to ~/.atomic-agent/.env, replacing YOUR_COMPOSIO_API_KEY with your key. Start Atomic Agent after saving the file.

bash
COMPOSIO_API_KEY=YOUR_COMPOSIO_API_KEY

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

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

Use Simplero from Atomic Agent

With your account connected, ask Atomic Agent to work with Simplero in natural language. You can connect more apps through the same Composio integration as you need them.

Visit the Atomic Agent website or inspect the Atomic Agent source code.

Troubleshooting

Why is my API key rejected?

Copy the key directly from the Composio dashboard. Atomic Agent requires ASCII characters because it sends the key in an HTTP header. Remove any extra characters introduced when copying.

Why are Composio tools unavailable after saving a key?

Check that you use Atomic Agent v0.5.6 or later and that Composio is enabled in your configuration. A "composio": { "enabled": false } setting disables the integration while keeping the saved key on disk.

Does Composio have a free plan?

The Hobby plan includes 100,000 tool calls per month. Composio-managed OAuth apps have a lower included allowance. See Composio pricing for the current limits that apply to your connection.

TOOLS

Supported Tools

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

Add Tag to Contact

Tool to add a tag to a contact identified by email address.

Bulk Subscribe to List

Tool to add multiple subscribers to a list in a single asynchronous request (max 1,000 per request).

Create or Update Administrator

Tool to create a new administratorship or update an existing one with the same email.

Create or Update Contact

Tool to create a new contact or update an existing contact with the same email.

Find Contact By Email

Tool to find and retrieve a contact by email address.

Find Subscription By Email

Tool to find subscriptions for a specific list by email address.

Get Administrator By ID

Tool to retrieve a single administratorship by internal ID.

Get Administrators

Tool to retrieve all administratorships for the account.

Get Admin Roles

Tool to retrieve all available admin roles for the account including custom roles.

Get Async Request Status

Tool to check the status of an asynchronous API request.

Get Contact By ID

Tool to retrieve a JSON representation of a contact by internal ID.

Get Invoices

Tool to get invoice information with optional filtering by date and invoice number.

Get All Lists

Tool to retrieve all mailing lists configured in the account.

Get Products

Tool to list all products in the account.

Remove Administrator

Tool to delete an administratorship by ID.

Remove Tag from Contact

Tool to remove a tag from a contact identified by email address.

Subscribe to List

Tool to add a new subscriber to a specific mailing list.

Unsubscribe From List

Tool to unsubscribe a customer from a specific mailing list.

Update Contact Credentials

Tool to update a contact's login credentials including email, first name, and last name.

FAQ

Frequently asked questions

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

Yes, you can. Atomic Agent 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 Simplero tools.

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

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