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How to connect Sendlane to Claude

Connect Claude Web, Desktop and Cowork to Sendlane MCP. Show all available sendlane custom fields, create a new email list for promotions, and more using natural language, with authentication handled for you.

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Sendlane is a cloud-based platform for email and SMS marketing automation. It helps eCommerce businesses engage customers through personalized campaigns.

6 Tools

Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.

This guide walks you through the easiest and most secure way to connect your Sendlane account to Claude via Composio Connect, enabling it to show all available Sendlane custom fields, create a new email list for promotions, list custom fields with pagination details, and more such actions on your behalf without compromising your account security.

Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

Also integrate Sendlane with

Claude CodeOpenAI Agents SDKClaude Agent SDKCodexOpenClawHermesAtomic AgentGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAIPydantic AIAutoGen

Connecting Sendlane to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

2. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

3. Connect your Sendlane account

Back in Claude, ask it to connect to Sendlane or give it any Sendlane-related task.

For example, ask Claude to:

  • "Show all available Sendlane custom fields"
  • "Create a new email list for promotions"
  • "List custom fields with pagination details"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your Sendlane account is ready to use.

What is the Sendlane Claude Connector, 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.

Troubleshooting

1. Why does Claude not use the Composio connector for Sendlane?

The connector can show as connected, but Claude must use it in each Sendlane conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to Sendlane again.

2. Why does Claude show an MCP server error before Sendlane connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Sendlane.

  • Check that the connector URL is https://connect.composio.dev/mcp.
  • Connectors run from Anthropic's cloud, so your device network is usually not the problem.
  • Add the connector again from Customize > Connectors, then ask Claude to connect Sendlane.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Sendlane authorization link not work?

The Composio connector is one server. Your Sendlane account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the Sendlane connection.
  • Composio creates a fresh Sendlane authorization link.
  • Open that link in your browser and finish the Sendlane sign-in.

4. Why do Sendlane actions fail after they worked before?

The Sendlane connection can expire or lose permission.

  • Ask Claude to inspect the Sendlane connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the Sendlane account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in Sendlane.
  • If the action still fails with a permission error, check that the connected account has that permission in Sendlane itself.

5. How do I switch to a different Sendlane account?

Claude can manage the Sendlane connection for you.

  • Ask Claude to disconnect or delete the current Sendlane account.
  • Ask Claude to connect Sendlane again.
  • Open the new Composio authorization link for Sendlane.
  • Sign in with the other Sendlane account in the browser.
  • After the account connects, ask Claude to retry the Sendlane task.

6. Why is my Sendlane connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your Sendlane connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Sendlane tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
  • On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect Sendlane.
TOOLS

Supported Tools

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

Get Campaigns

Tool to retrieve a list of email campaigns.

Get Custom Fields

Retrieve a list of all custom fields in your Sendlane account.

Get Lists

Tool to retrieve all mailing lists.

Delete List

Tool to delete a mailing list.

Create List

Tool to create a new list.

Create Tag

Tool to create a new tag.

FRAMEWORKS

How to build Sendlane MCP Agent with another framework

Claude Code logo

Claude Code

Use Sendlane MCP with Claude Code

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Sendlane MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Sendlane MCP with Claude Agent SDK

Codex logo

Codex

Use Sendlane MCP with Codex

OpenClaw logo

OpenClaw

Use Sendlane MCP with OpenClaw

Hermes logo

Hermes

Use Sendlane MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Sendlane MCP with Atomic Agent

Google ADK logo

Google ADK

Use Sendlane MCP with Google ADK

LangChain logo

LangChain

Use Sendlane MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Sendlane MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Sendlane MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Sendlane MCP with LlamaIndex

CrewAI logo

CrewAI

Use Sendlane MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Sendlane MCP with Pydantic AI

AutoGen logo

AutoGen

Use Sendlane MCP with AutoGen

FAQ

Frequently asked questions

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.

Yes, you can. Claude Cowork 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.

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.

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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