# How to integrate Mailercloud MCP with Atomic Agent

```json
{
  "title": "How to integrate Mailercloud MCP with Atomic Agent",
  "toolkit": "Mailercloud",
  "toolkit_slug": "mailercloud",
  "framework": "Atomic Agent",
  "framework_slug": "atomic-agent",
  "url": "https://composio.dev/toolkits/mailercloud/framework/atomic-agent",
  "markdown_url": "https://composio.dev/toolkits/mailercloud/framework/atomic-agent.md",
  "updated_at": "2026-08-11T13:04:36.200Z"
}
```

## 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 Mailercloud.
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 Mailercloud account. See the [Atomic Agent documentation](https://atomicagent.io/docs/?cta_placement=atomic-agent-docs) for installation instructions.

## Also integrate Mailercloud with

- [OpenAI Agents SDK](https://composio.dev/toolkits/mailercloud/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/mailercloud/framework/claude-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/mailercloud/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/mailercloud/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/mailercloud/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/mailercloud/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/mailercloud/framework/hermes-agent)
- [Google ADK](https://composio.dev/toolkits/mailercloud/framework/google-adk)
- [LangChain](https://composio.dev/toolkits/mailercloud/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/mailercloud/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/mailercloud/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/mailercloud/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/mailercloud/framework/crew-ai)
- [Pydantic AI](https://composio.dev/toolkits/mailercloud/framework/pydantic-ai)
- [AutoGen](https://composio.dev/toolkits/mailercloud/framework/autogen)

## TL;DR

### How Atomic Agent connects to Mailercloud
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 Mailercloud to Atomic Agent

### Connect Mailercloud to Atomic Agent
- Sign up or sign in to the [Composio dashboard](https://dashboard.composio.dev/?cta_placement=atomic-agent-api-key). Copy your API key.
- 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.
- Ask Atomic Agent to do something in Mailercloud. It searches Composio for the right tool.
- On first use, open the sign-in link returned in the chat. Connect your Mailercloud 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 Mailercloud MCP server, and what's possible with it?

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

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `MAILERCLOUD_CREATE_LIST` | Create List | Tool to create a new recipient list in Mailercloud for storing and managing contacts. Use when you need to create a new mailing list for organizing contacts. |
| `MAILERCLOUD_CREATE_PROPERTY` | Create custom property | Create a custom property for contacts in Mailercloud. Custom properties store specific information for contact records. Maximum of 100 properties allowed per account. |
| `MAILERCLOUD_DELETE_PROPERTY` | Delete Contact Property | Tool to delete a custom contact property by ID. Use when removing unused custom fields from contacts. Cannot delete properties used in webforms. |
| `MAILERCLOUD_GET_CLIENT_PLAN` | Get Client Plan | Tool to retrieve client plan information from Mailercloud. Use when you need to check the current subscription status, plan details, or verify API connectivity. |
| `MAILERCLOUD_SEARCH_CONTACTS_IN_LIST` | Search Contacts in List | Tool to retrieve contacts in a specific list with pagination. Use when you need to list or search contacts within a known list ID. |
| `MAILERCLOUD_UPDATE_CONTACT_PROPERTY` | Update Contact Property | Tool to update a custom property of contacts in Mailercloud. Use when you need to modify the name or description of an existing custom property. Note: Editing custom property type using this API is not possible - you can only edit the name and description. |

## Supported Triggers

None listed.

## 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](/pricing) for the current limits that apply to your connection.

## Complete Code

None listed.

## Conclusion

### Use Mailercloud from Atomic Agent
With your account connected, ask Atomic Agent to work with Mailercloud in natural language. You can connect more apps through the same Composio integration as you need them.
Visit the [Atomic Agent website](https://atomicagent.io/?cta_placement=atomic-agent-site) or inspect the [Atomic Agent source code](https://github.com/AtomicBot-ai/atomic-agent?cta_placement=atomic-agent-repo).

## How to build Mailercloud MCP Agent with another framework

- [OpenAI Agents SDK](https://composio.dev/toolkits/mailercloud/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/mailercloud/framework/claude-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/mailercloud/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/mailercloud/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/mailercloud/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/mailercloud/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/mailercloud/framework/hermes-agent)
- [Google ADK](https://composio.dev/toolkits/mailercloud/framework/google-adk)
- [LangChain](https://composio.dev/toolkits/mailercloud/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/mailercloud/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/mailercloud/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/mailercloud/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/mailercloud/framework/crew-ai)
- [Pydantic AI](https://composio.dev/toolkits/mailercloud/framework/pydantic-ai)
- [AutoGen](https://composio.dev/toolkits/mailercloud/framework/autogen)

## Related Toolkits

- [Google Sheets](https://composio.dev/toolkits/googlesheets) - Google Sheets is a cloud-based spreadsheet tool for real-time collaboration and data analysis. It lets teams work together from anywhere, updating information instantly.
- [Notion](https://composio.dev/toolkits/notion) - Notion is a collaborative workspace for notes, docs, wikis, and tasks. It streamlines team knowledge, project tracking, and workflow customization in one place.
- [Airtable](https://composio.dev/toolkits/airtable) - Airtable combines the flexibility of spreadsheets with the power of a database for easy project and data management. Teams use Airtable to organize, track, and collaborate with custom views and automations.
- [Asana](https://composio.dev/toolkits/asana) - Asana is a collaborative work management platform for teams to organize and track projects. It streamlines teamwork, boosts productivity, and keeps everyone aligned on goals.
- [Google Tasks](https://composio.dev/toolkits/googletasks) - Google Tasks is a to-do list and task management tool integrated into Gmail and Google Calendar. It helps you organize, track, and complete tasks across your Google ecosystem.
- [Linear](https://composio.dev/toolkits/linear) - Linear is a modern issue tracking and project planning tool for fast-moving teams. It helps streamline workflows, organize projects, and boost productivity.
- [Jira](https://composio.dev/toolkits/jira) - Jira is Atlassian’s platform for bug tracking, issue tracking, and agile project management. It helps teams organize work, prioritize tasks, and deliver projects efficiently.
- [Clickup](https://composio.dev/toolkits/clickup) - ClickUp is an all-in-one productivity platform for managing tasks, docs, goals, and team collaboration. It streamlines project workflows so teams can work smarter and stay organized in one place.
- [Monday](https://composio.dev/toolkits/monday) - Monday.com is a customizable work management platform for project planning and collaboration. It helps teams organize tasks, automate workflows, and track progress in real time.
- [Reddit](https://composio.dev/toolkits/reddit) - Reddit is a social news platform with thriving user-driven communities (subreddits). It's the go-to place for discussion, content sharing, and viral marketing.
- [Facebook](https://composio.dev/toolkits/facebook) - Facebook is a social media and advertising platform for businesses and creators. It helps you connect, share, and manage content across your public Facebook Pages.
- [Linkedin](https://composio.dev/toolkits/linkedin) - LinkedIn is a professional networking platform for connecting, sharing content, and engaging with business opportunities. It's the go-to place for building your professional brand and unlocking new career connections.
- [Active campaign](https://composio.dev/toolkits/active_campaign) - ActiveCampaign is a marketing automation and CRM platform for managing email campaigns, sales pipelines, and customer segmentation. It helps businesses engage customers and drive growth through smart automation and targeted outreach.
- [ActiveTrail](https://composio.dev/toolkits/active_trail) - ActiveTrail is a user-friendly email marketing and automation platform. It helps you reach subscribers and automate campaigns with ease.
- [Addressfinder](https://composio.dev/toolkits/addressfinder) - Addressfinder is a data quality platform for verifying addresses, emails, and phone numbers. It helps you ensure accurate customer and contact data every time.
- [Adobe Marketing Agent MCP](https://composio.dev/toolkits/adobe_marketing_agent_mcp) - Adobe Marketing Agent MCP is Adobe's hosted MCP service that exposes marketing context, preferences, and agent capabilities. Use it to provide agents with campaign, audience, and analytics context via a managed integration.
- [Agiled](https://composio.dev/toolkits/agiled) - Agiled is an all-in-one business management platform for CRM, projects, and finance. It helps you streamline workflows, consolidate client data, and manage business processes in one place.
- [Ahrefs](https://composio.dev/toolkits/ahrefs) - Ahrefs is an SEO and marketing platform for site audits, keyword research, and competitor insights. It helps you improve search rankings and drive organic traffic.
- [AimTell](https://composio.dev/toolkits/aimtell) - AimTell is a web push notification platform for managing websites, subscribers, campaigns, segments, and delivery analytics. Use it to send targeted browser notifications and measure engagement across your web push campaigns.
- [AirOps MCP](https://composio.dev/toolkits/airops_mcp) - AirOps MCP is AirOps' managed content platform exposing brand context, knowledge bases, and workflows. Use it to give agents brand-aware content, automate content workflows, and track Brand Kit edits.

## Frequently Asked Questions

### What are the differences in Tool Router MCP and Mailercloud MCP?

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

### Can I use Tool Router MCP with Atomic Agent?

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 Mailercloud tools.

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

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

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