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How to connect DeBounce to Claude

Connect Claude Web, Desktop and Cowork to DeBounce MCP. Validate new signup email addresses, check deliverability for marketing leads, and more using natural language, with authentication handled for you.

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DeBounce is an email verification service for checking address validity, deliverability, and risk. It helps keep contact lists clean so your campaigns reach real inboxes.

4 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 DeBounce account to Claude via Composio Connect, enabling it to validate new signup email addresses, check deliverability for marketing leads, get remaining DeBounce account credits, 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 DeBounce with

ChatGPTHermesAtomic Agent

Connecting DeBounce 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 DeBounce account

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

For example, ask Claude to:

  • "Validate new signup email addresses"
  • "Check deliverability for marketing leads"
  • "Get remaining DeBounce account credits"

It will prompt you to authenticate and authorize access.

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

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

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

Troubleshooting

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

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

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

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

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

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

3. Why does the DeBounce authorization link not work?

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

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

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

The DeBounce connection can expire or lose permission.

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

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

Claude can manage the DeBounce connection for you.

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

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

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

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

Supported Tools

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

Get Account Balance

Return the connected DeBounce account's remaining validation-credit balance.

Get API Usage

Return the aggregate number of DeBounce API validation calls in an inclusive date range.

Get Bulk Validation Status

Check progress for a bulk validation list created through the DeBounce Bulk API and return its result download URL when available.

Validate Email

Validate one email address with DeBounce and return its deliverability result, reason, and remaining credit balance.

FRAMEWORKS

How to build DeBounce MCP Agent with another framework

ChatGPT logo

ChatGPT

Use DeBounce MCP with ChatGPT

Hermes logo

Hermes

Use DeBounce MCP with Hermes

Atomic Agent logo

Atomic Agent

Use DeBounce MCP with Atomic Agent

FAQ

Frequently asked questions

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

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

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