How to connect Zerobounce to Claude Cowork

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Introduction

Cowork is Anthropic's AI agent for knowledge work. Think of it as Claude Code for everything else. It works autonomously with your computer, local files, and applications to accomplish complex tasks.

This guide walks you through the easiest and most secure way to connect your Zerobounce account to Cowork via Composio Connect, enabling it to validate a list of 100 new signups, score this email for lead quality, check deliverability of mark@gmail.com, and more such actions on your behalf without compromising your account security.

Also integrate Zerobounce with

Connecting Zerobounce to Claude Cowork

1. Open Customize

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

2. Add the Composio MCP server

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

3. 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 Cowork

4. Connect your Zerobounce account

Back in Cowork, ask the agent to connect to Zerobounce or give it any Zerobounce-related task.

For example, ask Cowork to:

  • "Validate a list of 100 new signups"
  • "Score this email for lead quality"
  • "Check deliverability of mark@gmail.com"

It will prompt you to authenticate and authorize access.

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

What is Claude Cowork?

Claude Cowork is Anthropic's agent for general knowledge work. It can use your computer, files, and connected applications to complete longer-running tasks across your work tools.

With Composio Connect, Cowork can securely access apps like Zerobounce through MCP without you sharing account credentials directly with the agent.

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

The Zerobounce MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Zerobounce account. It provides structured and secure access to your email validation and deliverability tools, so your agent can perform actions like validating emails, scoring leads, managing bulk jobs, and analyzing engagement—all automatically.

  • Real-time email validation: Instantly check if email addresses are valid, risky, or undeliverable before sending campaigns or updating your lists.
  • Bulk validation and processing: Upload files and process hundreds of emails or domains at once, with tools for tracking job status and retrieving results.
  • AI-powered lead scoring: Score individual email addresses using Zerobounce AI to assess lead quality and prioritize outreach.
  • Domain and pattern analysis: Identify common email address formats for any domain or run bulk domain searches to optimize your contact strategies.
  • Allowlist and blocklist management: Easily update your allow and block lists to fine-tune which addresses pass or fail validation, keeping your lists clean and secure.

Supported Tools & Triggers

Tools
Get Activity DataTool to get activity data (opens, clicks, etc.
AI Scoring Single EmailTool to score a single email address using zerobounce ai.
Allow or Block ListTool to manage allowlist and blocklist for email validation.
Batch Validate EmailsTool to validate a batch of email addresses in real time.
Delete fileTool to delete a file that was submitted for bulk validation.
Domain Search File StatusTool to get the processing status of a file submitted for bulk domain search.
Domain Search Get FileTool to download the results file for a completed bulk domain search job.
Domain Search Send FileTool to upload a file for bulk domain search.
Domain Search SingleTool to identify common email address formats for a given domain.
Delete Email Finder FileTool to delete a file that was submitted for bulk email finding.
Email Finder File StatusTool to get the processing status of a file submitted for bulk email finding.
Email Finder Send FileTool to upload a file for bulk email finding.
Email Finder SingleTool to find an email address for a given person and domain.
Get API UsageTool to retrieve api usage statistics for a given period.
Get Credit BalanceTool to retrieve your current zerobounce email validation credit balance.
List EvaluatorTool to evaluate the quality of an email list.
Send FileTool to upload a file for bulk email validation.
Validate EmailTool to validate a single email address in real time.

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FAQ

What are the differences in Tool Router MCP and Zerobounce MCP?

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

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

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

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