How to connect Sendloop to Claude

Connect Claude Web, Desktop and Cowork to Sendloop MCP. Show open and scheduled campaigns this week, list all subscribers in your main list, and more using natural language, with authentication handled for you.

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Sendloop is an all-in-one email marketing platform built for SaaS, e-commerce, and small businesses. It makes it easy to send campaigns, manage lists, and track results—all in one place.

5 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 Sendloop account to Claude via Composio Connect, enabling it to show open and scheduled campaigns this week, list all subscribers in your main list, get summary report for last email blast, 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 Sendloop with

Connecting Sendloop 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 Sendloop account

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

For example, ask Claude to:

  • "Show open and scheduled campaigns this week"
  • "List all subscribers in your main list"
  • "Get summary report for last email blast"

It will prompt you to authenticate and authorize access.

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

What is the Sendloop Claude Connector, and what's possible with it?

The Sendloop MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Sendloop account. It provides structured and secure access to your email marketing campaigns, subscriber lists, and detailed reports, so your agent can list campaigns, analyze subscriber data, retrieve account information, and review campaign performance on your behalf.

  • Comprehensive campaign management: Ask your agent to list all existing email campaigns, filter them by status, and handle pagination to easily browse through your marketing efforts.
  • Subscriber list access and reporting: Retrieve all your mailing lists and get detailed reports on subscriber growth, engagement, and performance after sending campaigns.
  • Targeted subscriber insights: Let the agent fetch subscribers for any given list, filter them by status, and manage large lists with effortless pagination.
  • Account information retrieval: Have your agent pull up-to-date details about your Sendloop account, keeping you informed about your overall setup and usage.
  • Performance analytics: Quickly get summary metrics for specific subscriber lists to evaluate campaign success and optimize your email marketing strategy.

Troubleshooting

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

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

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

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

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

  • 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 Sendloop.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Sendloop authorization link not work?

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

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

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

The Sendloop connection can expire or lose permission.

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

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

Claude can manage the Sendloop connection for you.

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

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

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

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click and click Clear cache.
  • If Sendloop 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 Sendloop.
TOOLS

Supported Tools

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

Get Sendloop Account Information

Tool to retrieve account information.

Get Overall List Report

Tool to retrieve overall report for a subscriber list.

List Campaigns

Tool to list campaigns.

List SendLoop Lists

Tool to retrieve subscriber lists.

List SendLoop Subscribers

Tool to list subscribers in a specified SendLoop list with pagination.

FAQ

Frequently asked questions

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

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

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