# How to integrate Agent mail MCP with Atomic Agent ```json { "title": "How to integrate Agent mail MCP with Atomic Agent", "toolkit": "Agent mail", "toolkit_slug": "agent_mail", "framework": "Atomic Agent", "framework_slug": "atomic-agent", "url": "https://composio.dev/toolkits/agent_mail/framework/atomic-agent", "markdown_url": "https://composio.dev/toolkits/agent_mail/framework/atomic-agent.md", "updated_at": "2026-08-14T10:04:48.340Z" } ``` ## 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 Agent mail. 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 Agent mail account. See the [Atomic Agent documentation](https://atomicagent.io/docs/?cta_placement=atomic-agent-docs) for installation instructions. ## Also integrate Agent mail with - [ChatGPT](https://composio.dev/toolkits/agent_mail/framework/chatgpt) - [Antigravity](https://composio.dev/toolkits/agent_mail/framework/antigravity) - [OpenAI Agents SDK](https://composio.dev/toolkits/agent_mail/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/agent_mail/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/agent_mail/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/agent_mail/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/agent_mail/framework/codex) - [Grok Build](https://composio.dev/toolkits/agent_mail/framework/grok-build) - [Cursor](https://composio.dev/toolkits/agent_mail/framework/cursor) - [VS Code](https://composio.dev/toolkits/agent_mail/framework/vscode) - [OpenCode](https://composio.dev/toolkits/agent_mail/framework/opencode) - [OpenClaw](https://composio.dev/toolkits/agent_mail/framework/openclaw) - [Hermes](https://composio.dev/toolkits/agent_mail/framework/hermes-agent) - [Pi](https://composio.dev/toolkits/agent_mail/framework/pi-agent) - [DeepSeek Harness](https://composio.dev/toolkits/agent_mail/framework/deepseek) - [Google ADK](https://composio.dev/toolkits/agent_mail/framework/google-adk) - [LangChain](https://composio.dev/toolkits/agent_mail/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/agent_mail/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/agent_mail/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/agent_mail/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/agent_mail/framework/crew-ai) - [Pydantic AI](https://composio.dev/toolkits/agent_mail/framework/pydantic-ai) - [AutoGen](https://composio.dev/toolkits/agent_mail/framework/autogen) ## TL;DR ### How Atomic Agent connects to Agent mail 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 Agent mail to Atomic Agent ### Connect Agent mail 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 Agent mail. It searches Composio for the right tool. - On first use, open the sign-in link returned in the chat. Connect your Agent mail 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 Agent mail MCP server, and what's possible with it? The Agent mail MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Agent mail account. It provides structured and secure access to your agent's dedicated inbox, so your agent can send emails, receive incoming messages, fetch specific conversations, and automate email-based workflows on your behalf. - Automated email sending: Instruct your agent to compose and send emails to any recipient, perfect for status updates, notifications, or outreach. - Message listing and inbox scanning: Let your agent quickly list all recent messages in the inbox to summarize, monitor, or trigger follow-up actions. - Targeted message retrieval: Have your agent fetch a specific message by ID, making it easy to pull full email content for context-aware decisions or replies. - Streamlined agent-to-agent communication: Enable your AI to directly interact with other agents or services via email, automating routine communication flows. ## Supported Tools | Tool slug | Name | Description | |---|---|---| | `AGENT_MAIL_CREATE_INBOX` | Create Inbox | Create a new AgentMail inbox via API. Returns the inbox_id and email address for sending/receiving messages. Use when provisioning new inboxes for agents or workflows. | | `AGENT_MAIL_GET_MESSAGE` | Get Message | Retrieve the complete details of a specific email message from an AgentMail inbox. This action returns the full message content including sender, recipients, subject, body (both text and HTML), attachments, labels, and metadata. Use this to read individual messages after discovering them via LIST_MESSAGES or webhooks. | | `AGENT_MAIL_LIST_INBOXES` | List Inboxes | List all inboxes available to the authenticated AgentMail account. Use this to discover valid inbox_id values for message operations. | | `AGENT_MAIL_LIST_MESSAGES` | List Messages | List messages from an AgentMail inbox. Returns a `messages` array; each message uses `message_id` and `timestamp` fields (not `id`, `date`, or `items`). | | `AGENT_MAIL_SEND_EMAIL` | Send Email | Send an email using AgentMail API | ## Supported Triggers | Trigger slug | Name | Description | |---|---|---| | `AGENT_MAIL_NEW_EMAIL_TRIGGER` | New Email Received | Trigger for new emails in an AgentMail inbox | ## 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 Agent mail from Atomic Agent With your account connected, ask Atomic Agent to work with Agent mail 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 Agent mail MCP Agent with another framework - [ChatGPT](https://composio.dev/toolkits/agent_mail/framework/chatgpt) - [Antigravity](https://composio.dev/toolkits/agent_mail/framework/antigravity) - [OpenAI Agents SDK](https://composio.dev/toolkits/agent_mail/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/agent_mail/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/agent_mail/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/agent_mail/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/agent_mail/framework/codex) - [Grok Build](https://composio.dev/toolkits/agent_mail/framework/grok-build) - [Cursor](https://composio.dev/toolkits/agent_mail/framework/cursor) - [VS Code](https://composio.dev/toolkits/agent_mail/framework/vscode) - [OpenCode](https://composio.dev/toolkits/agent_mail/framework/opencode) - [OpenClaw](https://composio.dev/toolkits/agent_mail/framework/openclaw) - [Hermes](https://composio.dev/toolkits/agent_mail/framework/hermes-agent) - [Pi](https://composio.dev/toolkits/agent_mail/framework/pi-agent) - [DeepSeek Harness](https://composio.dev/toolkits/agent_mail/framework/deepseek) - [Google ADK](https://composio.dev/toolkits/agent_mail/framework/google-adk) - [LangChain](https://composio.dev/toolkits/agent_mail/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/agent_mail/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/agent_mail/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/agent_mail/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/agent_mail/framework/crew-ai) - [Pydantic AI](https://composio.dev/toolkits/agent_mail/framework/pydantic-ai) - [AutoGen](https://composio.dev/toolkits/agent_mail/framework/autogen) ## Related Toolkits - [Gmail](https://composio.dev/toolkits/gmail) - Gmail is Google's email service with powerful spam protection, search, and G Suite integration. It keeps your inbox organized and makes communication fast and reliable. - [Outlook](https://composio.dev/toolkits/outlook) - Outlook is Microsoft's email and calendaring platform for unified communications and scheduling. It helps users stay organized with powerful email, contacts, and calendar management. - [Slack](https://composio.dev/toolkits/slack) - Slack is a channel-based messaging platform for teams and organizations. It helps people collaborate in real time, share files, and connect all their tools in one place. - [Gong](https://composio.dev/toolkits/gong) - Gong is a platform for video meetings, call recording, and team collaboration. It helps teams capture conversations, analyze calls, and turn insights into action. - [Microsoft teams](https://composio.dev/toolkits/microsoft_teams) - Microsoft Teams is a collaboration platform that combines chat, meetings, and file sharing within Microsoft 365. It keeps distributed teams connected and productive through seamless virtual communication. - [Slackbot](https://composio.dev/toolkits/slackbot) - Slackbot is a conversational automation tool for Slack that handles reminders, notifications, and automated responses. It boosts team productivity by streamlining onboarding, answering FAQs, and managing timely alerts—all right inside Slack. - [2chat](https://composio.dev/toolkits/_2chat) - 2chat is an API platform for WhatsApp and multichannel text messaging. It streamlines chat automation, group management, and real-time messaging for developers. - [Android Texter](https://composio.dev/toolkits/android_texter) - Android Texter is an API service that connects Android phones to SMS, MMS, contacts, and device data. Use it to automate mobile messaging without building your own phone-to-API bridge. - [Basecamp](https://composio.dev/toolkits/basecamp) - Basecamp is a project management and team collaboration tool by 37signals. It helps teams organize tasks, share files, and communicate efficiently in one place. - [Blooio](https://composio.dev/toolkits/blooio) - Blooio is a stable v2 API platform for messaging, chats, contacts, groups, phone numbers, and account analytics. It gives teams a clean way to build reliable communication workflows without stitching together fragile custom APIs. - [CallOnTheGo](https://composio.dev/toolkits/callonthego) - CallOnTheGo is a telephony API for managing phone numbers, caller IDs, suppression lists, audio assets, contact lists, and Voice AI campaigns. It provides programmatic control over calling infrastructure and campaign automation for scalable voice outreach. - [Carbon Voice MCP](https://composio.dev/toolkits/carbon_voice_mcp) - Carbon Voice MCP is a voice-first collaboration platform for messages, conversations, and workflows. Use it to centralize voice communications and streamline team collaboration. - [CardClan](https://composio.dev/toolkits/cardclan) - CardClan is a digital card platform for creating and sending personalized team cards. Use it to celebrate moments, share card links, and manage card workflows without extra coordination. - [Chatwork](https://composio.dev/toolkits/chatwork) - Chatwork is a team communication platform with group chats, file sharing, and task management. It helps businesses boost collaboration and streamline productivity. - [Clickmeeting](https://composio.dev/toolkits/clickmeeting) - ClickMeeting is a cloud-based platform for running online meetings and webinars. It helps businesses and individuals host, manage, and engage virtual audiences with ease. - [Confluence](https://composio.dev/toolkits/confluence) - Confluence is Atlassian's team collaboration and knowledge management platform. It helps your team organize, share, and update documents and project content in one secure workspace. - [Daily](https://composio.dev/toolkits/daily) - Daily is a WebRTC video and audio API platform for building rooms, meetings, recordings, live streams, transcriptions, and telephony. It gives developers reliable real-time media infrastructure without managing complex conferencing stacks. - [Dailybot](https://composio.dev/toolkits/dailybot) - DailyBot streamlines team collaboration with chat-based standups, reminders, and polls. It keeps work flowing smoothly in your favorite messaging platforms. - [Dialmycalls](https://composio.dev/toolkits/dialmycalls) - Dialmycalls is a mass notification service for sending voice and text messages to contacts. It helps teams and organizations quickly broadcast urgent alerts and updates. - [Dialpad](https://composio.dev/toolkits/dialpad) - Dialpad is a cloud-based business phone and contact center system for teams. It unifies voice, video, messaging, and meetings across your devices. ## Frequently Asked Questions ### What are the differences in Tool Router MCP and Agent mail MCP? With a standalone Agent mail MCP server, the agents and LLMs can only access a fixed set of Agent mail tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Agent mail 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 Agent mail tools. ### Can I manage the permissions and scopes for Agent mail while using Tool Router? Yes, absolutely. You can configure which Agent mail 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 Agent mail data and credentials are handled as safely as possible. --- [See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)