# How to integrate Sendlane MCP with Atomic Agent

```json
{
  "title": "How to integrate Sendlane MCP with Atomic Agent",
  "toolkit": "Sendlane",
  "toolkit_slug": "sendlane",
  "framework": "Atomic Agent",
  "framework_slug": "atomic-agent",
  "url": "https://composio.dev/toolkits/sendlane/framework/atomic-agent",
  "markdown_url": "https://composio.dev/toolkits/sendlane/framework/atomic-agent.md",
  "updated_at": "2026-08-11T13:14:31.440Z"
}
```

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

## Also integrate Sendlane with

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

## TL;DR

### How Atomic Agent connects to Sendlane
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 Sendlane to Atomic Agent

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

The Sendlane MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Sendlane account. It provides structured and secure access to your Sendlane marketing automation tools, so your agent can perform actions like managing custom fields, creating new mailing lists, and streamlining campaign setup on your behalf.
- Retrieve custom fields: Quickly fetch and review all custom fields in your Sendlane account to personalize your marketing and segmentation strategies.
- Create new mailing lists: Direct your agent to set up brand new subscriber lists, making it easy to organize contacts before launching email or SMS campaigns.
- Automate list management: Effortlessly build and maintain your audience lists through AI-driven workflows, minimizing manual effort and reducing errors.
- Simplify campaign preparation: Ensure your agent can gather all required fields and lists before sending targeted email or SMS outreach, enabling smoother campaign launches.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `SENDLANE_GET_CAMPAIGNS` | Get Campaigns | Tool to retrieve a list of email campaigns. Use when you need to fetch all campaigns with optional pagination. |
| `SENDLANE_GET_CUSTOM_FIELDS` | Get Custom Fields | Retrieve a list of all custom fields in your Sendlane account. Custom fields allow you to store additional contact information beyond the standard fields. Use this tool to discover available custom fields, their IDs, names, tags, and types before creating or updating contacts with custom field data. Supports optional pagination via page and per_page parameters. |
| `SENDLANE_GET_LISTS` | Get Lists | Tool to retrieve all mailing lists. Use when you need to fetch or display all available contact lists with optional pagination. |
| `SENDLANE_LIST_DELETE` | Delete List | Tool to delete a mailing list. Use when you need to remove an unwanted list after confirming its list_id. |
| `SENDLANE_POST_LIST` | Create List | Tool to create a new list. Use when you need to add a brand-new mailing list before sending campaigns. |
| `SENDLANE_TAG_CREATE` | Create Tag | Tool to create a new tag. Use when you need to segment subscribers using labels. |

## 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 Sendlane from Atomic Agent
With your account connected, ask Atomic Agent to work with Sendlane 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 Sendlane MCP Agent with another framework

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

## Related Toolkits

- [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.
- [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.
- [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.
- [Amcards](https://composio.dev/toolkits/amcards) - AMCards lets you create and mail personalized greeting cards online. Build stronger customer relationships with easy, automated card campaigns.
- [Beamer](https://composio.dev/toolkits/beamer) - Beamer is a news and changelog platform for in-app announcements and feature updates. It helps companies boost user engagement by sharing news where users are most active.
- [Beehiiv](https://composio.dev/toolkits/beehiiv) - Beehiiv is a newsletter platform for creating and managing publications and subscribers. It helps grow audience engagement and monetize your mailing list.
- [Benchmark email](https://composio.dev/toolkits/benchmark_email) - Benchmark Email is a platform for creating, sending, and tracking email campaigns. It's built to help you engage audiences and analyze results—all in one place.
- [Bigmailer](https://composio.dev/toolkits/bigmailer) - BigMailer is an email marketing platform for managing multiple brands with white-labeling and automation. It helps teams streamline campaigns and simplify integration with Amazon SES.
- [Bitly](https://composio.dev/toolkits/bitly) - Bitly is a link management platform for shortening, customizing, sharing, and tracking links and QR codes. It helps teams create branded links and measure engagement across campaigns.
- [BlueFox Email](https://composio.dev/toolkits/bluefox_email) - BlueFox Email is an email API for managing contacts, subscriber lists, and sending transactional and triggered messages. Use it to reliably send transactional and triggered emails and manage subscribers at scale.
- [Brandfetch](https://composio.dev/toolkits/brandfetch) - Brandfetch is an API that delivers company logos, colors, and visual branding assets. It helps marketers and developers keep brand visuals consistent everywhere.
- [Braze](https://composio.dev/toolkits/braze) - Braze is a customer engagement platform for managing user data, messaging, campaigns, and analytics. Use it to deliver targeted, multi-channel messaging and analyze campaign performance.
- [Brevo](https://composio.dev/toolkits/brevo) - Brevo is an all-in-one email and SMS marketing platform for transactional messaging, automation, and CRM. It helps businesses engage customers and streamline communications through powerful campaign tools.
- [Buffer](https://composio.dev/toolkits/buffer) - Buffer is a social media management platform for planning, creating, scheduling, and publishing posts across connected channels. It helps teams keep content organized and publish consistently without jumping between social apps.
- [BulkPublish](https://composio.dev/toolkits/bulkpublish) - BulkPublish is a social media publishing platform for managing scheduled content across multiple channels. It helps teams plan campaigns, publish consistently, and track performance in one place.

## Frequently Asked Questions

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

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

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

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

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