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How to connect PureChecker to Claude

Connect Claude Web, Desktop and Cowork to PureChecker MCP. Verify deliverability for these customer emails, check if signup emails are disposable, and more using natural language, with authentication handled for you.

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PureChecker verifies individual or batched email addresses for syntax, domain, deliverability, disposability, and risk signals. Use it to boost deliverability, remove risky/disposable addresses, and reduce bounce rates.

2 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 PureChecker account to Claude via Composio Connect, enabling it to verify deliverability for these customer emails, check if signup emails are disposable, batch validate newsletter signup emails, 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 PureChecker with

ChatGPTHermes

Connecting PureChecker 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 PureChecker account

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

For example, ask Claude to:

  • "Verify deliverability for these customer emails"
  • "Check if signup emails are disposable"
  • "Batch validate newsletter signup emails"

It will prompt you to authenticate and authorize access.

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

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

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

Troubleshooting

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

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

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

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

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

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

3. Why does the PureChecker authorization link not work?

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

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

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

The PureChecker connection can expire or lose permission.

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

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

Claude can manage the PureChecker connection for you.

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

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

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

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

Supported Tools

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

Check Email

Check one email address and return PureChecker's detailed syntax, domain, mailbox, disposability, and risk signals.

Check Emails

Check a batch of email addresses in one request and return PureChecker's verification signals for each address.

FRAMEWORKS

How to build PureChecker MCP Agent with another framework

ChatGPT logo

ChatGPT

Use PureChecker MCP with ChatGPT

Hermes logo

Hermes

Use PureChecker MCP with Hermes

FAQ

Frequently asked questions

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

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

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