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How to connect Listclean to Claude

Connect Claude Web, Desktop and Cowork to Listclean MCP. Verify if this email address is valid, check how many email credits i have left, and more using natural language, with authentication handled for you.

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Listclean is an email verification service that helps you validate and clean up your email lists. It improves deliverability and protects your sender reputation by removing invalid addresses.

16 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 Listclean account to Claude via Composio Connect, enabling it to verify if this email address is valid, check how many email credits I have left, create a CSV for bulk email verification, 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.

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Connecting Listclean 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 Listclean account

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

For example, ask Claude to:

  • "Verify if this email address is valid"
  • "Check how many email credits I have left"
  • "Create a CSV for bulk email verification"

It will prompt you to authenticate and authorize access.

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

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

The Listclean MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Listclean account. It provides structured and secure access to your email verification tools, so your agent can perform actions like verifying emails, managing bulk verification lists, checking credits, and retrieving account info on your behalf.

  • Single email verification: Instantly check if an email address is valid, deliverable, or disposable—perfect for real-time signups or contact forms.
  • Bulk email list processing: Have your agent generate and upload CSV files of email addresses for large-scale verification and list cleaning.
  • Account credit monitoring: Easily monitor your remaining verification credits so your automations never hit a surprise limit.
  • Profile data retrieval: Let your agent fetch and review your Listclean account profile details for audits or reporting purposes.

Troubleshooting

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

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

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

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

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

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

3. Why does the Listclean authorization link not work?

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

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

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

The Listclean connection can expire or lose permission.

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

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

Claude can manage the Listclean connection for you.

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

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

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

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

Supported Tools

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

Create Bulk Verification List

Tool to create a CSV file with provided email addresses for bulk verification.

Delete List

Tool to permanently delete a single list from the account.

Download List Results as CSV

Tool to download list results as a CSV file.

Download List Results as JSON

Tool to download list results as JSON.

Get Account Profile

Tool to retrieve the authenticated account's profile.

Get Remaining Credits

Tool to retrieve remaining verification credits.

Get List Information

Tool to retrieve detailed information for a specific list.

Get Upload Status

Tool to retrieve the status of a specific upload.

Get Verification Logs

Tool to retrieve logs for all single email verifications.

List All Verification Lists

Tool to retrieve all email verification lists.

List CSV Uploads

Tool to retrieve the list of CSV uploads.

Start Upload

Tool to start a CSV upload process for bulk email verification.

Update Account Profile

Tool to update account profile details.

Upload Chunk

Tool to upload a chunk of a CSV file.

Verify Batch of Emails

Tool to verify a batch of email addresses (max 3000 emails).

Verify Email Address

Tool to verify an email's validity.

FRAMEWORKS

How to build Listclean MCP Agent with another framework

Claude Code logo

Claude Code

Use Listclean MCP with Claude Code

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Listclean MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Listclean MCP with Claude Agent SDK

Codex logo

Codex

Use Listclean MCP with Codex

OpenClaw logo

OpenClaw

Use Listclean MCP with OpenClaw

Hermes logo

Hermes

Use Listclean MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Listclean MCP with Atomic Agent

Google ADK logo

Google ADK

Use Listclean MCP with Google ADK

LangChain logo

LangChain

Use Listclean MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Listclean MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Listclean MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Listclean MCP with LlamaIndex

CrewAI logo

CrewAI

Use Listclean MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Listclean MCP with Pydantic AI

AutoGen logo

AutoGen

Use Listclean MCP with AutoGen

FAQ

Frequently asked questions

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

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

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