How to connect Clearout to Claude

Connect Claude Web, Desktop and Cowork to Clearout MCP. Validate a list of emails for deliverability, check if this email is a business account, and more using natural language, with authentication handled for you.

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Clearout is an AI-powered service for verifying, finding, and enriching email addresses. It boosts deliverability and helps you discover high-quality leads effortlessly.

21 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 Clearout account to Claude via Composio Connect, enabling it to validate a list of emails for deliverability, check if this email is a business account, find the most likely domain for Acme Corp, 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 Clearout with

Connecting Clearout 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 Clearout account

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

For example, ask Claude to:

  • "Validate a list of emails for deliverability"
  • "Check if this email is a business account"
  • "Find the most likely domain for Acme Corp"

It will prompt you to authenticate and authorize access.

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

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

The Clearout MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Clearout account. It provides structured and secure access to email validation, prospecting, and enrichment tools, so your agent can perform actions like verifying email addresses, finding business contacts, checking domain details, and bulk-processing lists on your behalf.

  • AI-powered email verification: Instantly validate single or bulk email addresses to ensure deliverability and reduce bounce rates.
  • Email prospecting and enrichment: Find emails for people or companies, complete missing contact data, and verify if accounts are business or personal.
  • Domain and company intelligence: Retrieve company domains from names, fetch MX records, or pull WHOIS information to understand your leads and their infrastructure.
  • Disposable and catch-all detection: Check if an email is temporary or if a domain accepts all mail, helping you maintain list quality and avoid spam traps.
  • Bulk job automation: Upload, process, monitor, cancel, and download results for large-scale email finding and verification tasks, all through your agent.

Troubleshooting

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

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

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

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

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

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

3. Why does the Clearout authorization link not work?

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

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

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

The Clearout connection can expire or lose permission.

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

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

Claude can manage the Clearout connection for you.

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

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

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

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

Supported Tools

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

Autocomplete Company to Domain

Tool to autocomplete company names to probable domains with confidence scores.

Business Account Verify

Tool to check if an email belongs to a business/work account.

Catch-All Verify

Tool to check if an email domain is catch-all.

Verify Disposable Email

Tool to check if an email is from a disposable provider.

Find Domain MX Records

Tool to retrieve MX records for a domain in priority order.

Fetch Domain WHOIS Information

Tool to fetch WHOIS record for a domain.

Bulk Email Finder

Tool to upload a CSV or XLSX contacts file for bulk email finding.

Cancel Bulk Email Finder Job

Tool to cancel a running bulk email finder job.

Bulk Email Finder Result Download

Tool to generate a bulk email finder result download URL.

Bulk Email Verify

Tool to upload a CSV or XLSX file for bulk email verification.

Cancel Bulk Email Verification Job

Cancel an in-progress bulk email verification job.

Bulk Email Verify Progress Status

Tool to retrieve progress for a bulk email verification job.

Bulk Email Verify Result Download

Tool to obtain a temporary URL for bulk email verification results.

Email Verify Get Credits

Tool to fetch available email verification credits.

Instant Email Verifier

Tool to instantly verify a single email address.

Verify Free Email Account

Tool to detect if an email is from a free email service provider.

Verify Gibberish Email

Tool to verify if an email address is gibberish.

Reverse Lookup Company by Domain

Find company information (name, logo, LinkedIn URL, address) by looking up its domain name.

Reverse Lookup Person by Email

Tool to retrieve a person’s profile from an email address.

Find Person via LinkedIn URL

Tool to discover person information via a LinkedIn profile URL.

Role Account Verifier

Tool to determine if an email is a role-based account.

FAQ

Frequently asked questions

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

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

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