# How to connect Emailvalidation to Claude

```json
{
  "title": "How to connect Emailvalidation to Claude",
  "toolkit": "Emailvalidation",
  "toolkit_slug": "emailvalidation",
  "framework": "Claude Cowork",
  "framework_slug": "claude-cowork",
  "url": "https://composio.dev/toolkits/emailvalidation/framework/claude-cowork",
  "markdown_url": "https://composio.dev/toolkits/emailvalidation/framework/claude-cowork.md",
  "updated_at": "2026-09-09T05:34:04.630Z"
}
```

## 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 Emailvalidation account to Claude via Composio Connect, enabling it to validate deliverability for john@example.com now, check account quota usage for today, batch validate these 50 email addresses, 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 Emailvalidation with

- [ChatGPT Work](https://composio.dev/toolkits/emailvalidation/framework/chatgpt)
- [Hermes](https://composio.dev/toolkits/emailvalidation/framework/hermes-agent)

## Connect Emailvalidation to Claude Cowork

### Connecting Emailvalidation to Claude Web, Desktop, and Cowork
1. Open Customize
In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.
2. Add the Composio MCP server
Click Add custom connector and paste in the Composio MCP server URL:

```bash
https://connect.composio.dev/mcp
```

## What is the Emailvalidation MCP server, and what's possible with it?

The Emailvalidation MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Emailvalidation account. It provides structured and secure access so your agent can perform Emailvalidation operations on your behalf.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `EMAILVALIDATION_GET_ACCOUNT_QUOTA_STATUS` | Get Account Quota Status | Return the connected emailvalidation.io account ID and current monthly and grace credit totals, usage, and remaining balances. This status check does not consume validation credits or count against the API rate limit. |
| `EMAILVALIDATION_VALIDATE_EMAIL_ADDRESS` | Validate Email Address | Validate one email address and return deliverability, format, mailbox, domain, role-address, disposable-address, and quality signals. Each successful validation costs one account credit. Catch-all detection is optional, disabled by default, and requires a Small or higher plan; requesting it on an unsupported plan can still consume one credit. |

## Supported Triggers

None listed.

## Troubleshooting

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

The connector can show as connected, but Claude must use it in each Emailvalidation conversation.
- Click + at the lower left of the chat, or type /.
- Hover Connectors.
- Turn on Composio.
- Ask Claude to connect to Emailvalidation again.

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

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Emailvalidation.
- 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 Emailvalidation.
- If it fails again, send the error and the ofid_ reference id to support@composio.dev.

### 3. Why does the Emailvalidation authorization link not work?

The Composio connector is one server. Your Emailvalidation account connects separately when Claude asks for it.
- If the browser does not open, or the link expires, ask Claude to retry the Emailvalidation connection.
- Composio creates a fresh Emailvalidation authorization link.
- Open that link in your browser and finish the Emailvalidation sign-in.

### 4. Why do Emailvalidation actions fail after they worked before?

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

### 5. How do I switch to a different Emailvalidation account?

Claude can manage the Emailvalidation connection for you.
- Ask Claude to disconnect or delete the current Emailvalidation account.
- Ask Claude to connect Emailvalidation again.
- Open the new Composio authorization link for Emailvalidation.
- Sign in with the other Emailvalidation account in the browser.
- After the account connects, ask Claude to retry the Emailvalidation task.

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

The connector belongs to your Claude account, so your Emailvalidation connection works in Claude Web, Desktop, and Cowork.
- In Claude Desktop, open Customize > Connectors.
- Next to Composio, click ⋮ and click Clear cache.
- If Emailvalidation 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 Emailvalidation.

## Creating MCP Server - Stand-alone vs Composio SDK

The Emailvalidation MCP server connects Claude Web, Desktop, and Cowork to your Emailvalidation account through Composio. Once connected, Claude can use the available Emailvalidation tools and triggers to complete tasks on your behalf.

## Complete Code

None listed.

## How to build Emailvalidation MCP Agent with another framework

- [ChatGPT Work](https://composio.dev/toolkits/emailvalidation/framework/chatgpt)
- [Hermes](https://composio.dev/toolkits/emailvalidation/framework/hermes-agent)

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## Frequently Asked Questions

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

With a standalone Emailvalidation MCP server, the agents and LLMs can only access a fixed set of Emailvalidation tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Emailvalidation and many other apps based on the task at hand, all through a single MCP endpoint.

### Can I use Tool Router MCP with Claude Cowork?

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 Emailvalidation tools.

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

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

---
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