How to integrate Sender MCP with Atomic Agent

Connect Atomic Agent to Sender MCP. Create a new email campaign for holiday sale, add a contact to your main subscriber list, and more using natural language, with authentication handled for you.

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Api Key

Sender is an email marketing platform for creating campaigns and automations. It helps you manage, automate, and track email marketing results easily.

9 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 Sender.

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 Sender account. See the Atomic Agent documentation for installation instructions.

Also integrate Sender with

How Atomic Agent connects to Sender

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 Sender 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 Sender. It searches Composio for the right tool.
  4. On first use, open the sign-in link returned in the chat. Connect your Sender 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 Sender MCP server, and what's possible with it?

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

Use Sender from Atomic Agent

With your account connected, ask Atomic Agent to work with Sender 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 Sender action and event your agent gets out of the box.

Create Field

Tool to create a new custom subscriber field in Sender.

Create Or Update Subscriber

Tool to create a new subscriber or update an existing one in Sender.

Get All Fields

Tool to retrieve a list of all custom subscriber fields configured in the Sender.

Get All Workflows

Tool to retrieve a list of all automation workflows in the Sender account.

Get Campaign By ID

Tool to retrieve a specific campaign by its unique ID from Sender.

Get Group By ID

Tool to retrieve a specific subscriber group by its unique ID from Sender.

Get Subscriber By Email

Tool to retrieve a specific subscriber by their email address from Sender.

Get Subscriber By ID

Tool to retrieve a specific subscriber by their unique ID from Sender.

Update Subscriber Fields

Tool to update custom fields and information for an existing subscriber in Sender.

FAQ

Frequently asked questions

With a standalone Sender MCP server, the agents and LLMs can only access a fixed set of Sender tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Sender 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 Sender tools.

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

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