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How to connect Bouncer to Claude

Connect Claude Web, Desktop and Cowork to Bouncer MCP. Verify this email address instantly, check domain validity for new signups, and more using natural language, with authentication handled for you.

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Bouncer is an email validation platform that verifies the authenticity of email addresses in real-time and batch. It helps boost deliverability and reduce bounce rates for your communications.

10 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 Bouncer account to Claude via Composio Connect, enabling it to verify this email address instantly, check domain validity for new signups, batch-verify a list of customer 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 Bouncer with

Claude CodeOpenAI Agents SDKClaude Agent SDKCodexOpenClawHermesAtomic AgentGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAIPydantic AIAutoGen

Connecting Bouncer 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 Bouncer account

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

For example, ask Claude to:

  • "Verify this email address instantly"
  • "Check domain validity for new signups"
  • "Batch-verify a list of customer emails"

It will prompt you to authenticate and authorize access.

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

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

The Bouncer MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Bouncer account. It provides structured and secure access to your email verification and validation tools, so your agent can perform actions like real-time email validation, bulk verification, domain checks, and toxicity analysis for improved email deliverability.

  • Real-time email verification: Instantly validate single email addresses to check deliverability and reduce bounce rates before sending messages.
  • Bulk batch verification: Initiate, manage, and retrieve results from batch email verification jobs to clean and maintain large email lists efficiently.
  • Toxicity analysis of email lists: Start and monitor toxicity analysis jobs to identify potentially harmful or problematic email addresses in your database.
  • Domain verification: Check the validity and configuration of email domains, including MX records and catch-all status, to ensure emails reach their intended targets.
  • Automated batch management: Finish, delete, or update batch verification and toxicity jobs to keep your verification workflows tidy and up-to-date.

Troubleshooting

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

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

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

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

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

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

3. Why does the Bouncer authorization link not work?

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

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

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

The Bouncer connection can expire or lose permission.

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

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

Claude can manage the Bouncer connection for you.

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

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

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

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

Supported Tools

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

Check Toxicity List Job Status

Tool to check the status of a specific toxicity list job.

Create Batch Request

Initiates an asynchronous batch email verification request.

Create Toxicity List Job

Tool to create a toxicity analysis job for a list of email addresses.

Delete batch request

Deletes a batch email verification request and all associated emails and results.

Delete Toxicity List Job

Tool to delete a specific toxicity list job.

Finish Batch

Tool to mark a batch verification process as finished early.

Get Batch Results

Tool to retrieve the results of a batch verification process.

Get Credits

Tool to retrieve the current credit balance for the account.

Verify Domain

Tool to verify the validity and configuration of a domain.

Verify Email

Tool to verify a single email address in real-time.

FRAMEWORKS

How to build Bouncer MCP Agent with another framework

Claude Code logo

Claude Code

Use Bouncer MCP with Claude Code

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Bouncer MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Bouncer MCP with Claude Agent SDK

Codex logo

Codex

Use Bouncer MCP with Codex

OpenClaw logo

OpenClaw

Use Bouncer MCP with OpenClaw

Hermes logo

Hermes

Use Bouncer MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Bouncer MCP with Atomic Agent

Google ADK logo

Google ADK

Use Bouncer MCP with Google ADK

LangChain logo

LangChain

Use Bouncer MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Bouncer MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Bouncer MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Bouncer MCP with LlamaIndex

CrewAI logo

CrewAI

Use Bouncer MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Bouncer MCP with Pydantic AI

AutoGen logo

AutoGen

Use Bouncer MCP with AutoGen

FAQ

Frequently asked questions

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

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

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