# How to connect Zerobounce to Claude Cowork ```json { "title": "How to connect Zerobounce to Claude Cowork", "toolkit": "Zerobounce", "toolkit_slug": "zerobounce", "framework": "Claude Cowork", "framework_slug": "claude-cowork", "url": "https://composio.dev/toolkits/zerobounce/framework/claude-cowork", "markdown_url": "https://composio.dev/toolkits/zerobounce/framework/claude-cowork.md", "updated_at": "2026-05-12T10:31:14.773Z" } ``` ## 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 - [OpenAI Agents SDK](https://composio.dev/toolkits/zerobounce/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/zerobounce/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/zerobounce/framework/claude-code) - [Codex](https://composio.dev/toolkits/zerobounce/framework/codex) - [OpenClaw](https://composio.dev/toolkits/zerobounce/framework/openclaw) - [Hermes](https://composio.dev/toolkits/zerobounce/framework/hermes-agent) - [CLI](https://composio.dev/toolkits/zerobounce/framework/cli) - [Google ADK](https://composio.dev/toolkits/zerobounce/framework/google-adk) - [LangChain](https://composio.dev/toolkits/zerobounce/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/zerobounce/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/zerobounce/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/zerobounce/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/zerobounce/framework/crew-ai) ## Connect Zerobounce to Claude Cowork ### 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. 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 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 | Tool slug | Name | Description | |---|---|---| | `ZEROBOUNCE_ACTIVITY_DATA` | Get Activity Data | Tool to get activity data (opens, clicks, etc.) for a given email. Use after confirming the email address to gauge engagement recency. | | `ZEROBOUNCE_AI_SCORING_SINGLE` | AI Scoring Single Email | Tool to score a single email address using ZeroBounce AI. Use when you need real-time email lead quality feedback before outreach. Example prompt: "Score the email mark@gmail.com." | | `ZEROBOUNCE_ALLOW_BLOCK_LIST` | Allow or Block List | Tool to manage allowlist and blocklist for email validation. Use when you need to programmatically add or modify custom filters before validating emails. | | `ZEROBOUNCE_BATCH_VALIDATE_EMAILS` | Batch Validate Emails | Tool to validate a batch of email addresses in real time. Use when you need to validate up to 200 emails at once with optional activity data. | | `ZEROBOUNCE_DELETE_AI_SCORING_FILE` | Delete AI Scoring File | Tool to remove a completed AI scoring file from ZeroBounce servers. Use when the file status is 'Complete' and you need to remove it. | | `ZEROBOUNCE_DELETE_FILE` | Delete file | Tool to delete a file that was submitted for bulk validation. Use when file status is 'Complete'. | | `ZEROBOUNCE_DOMAIN_SEARCH_FILE_STATUS` | Domain Search File Status | Tool to get the processing status of a file submitted for bulk domain search. Use after submitting the file to poll status. | | `ZEROBOUNCE_DOMAIN_SEARCH_GET_FILE` | Domain Search Get File | Tool to download the results file for a completed bulk domain search job. Use when you have the file_id and the job is complete. | | `ZEROBOUNCE_DOMAIN_SEARCH_SEND_FILE` | Domain Search Send File | Tool to upload a file for bulk domain search. Use when you have many domains in a CSV/TXT and need to lookup their details in bulk. | | `ZEROBOUNCE_DOMAIN_SEARCH_SINGLE` | Domain Search Single | Tool to identify common email address formats for a given domain. Use when you need to guess email patterns for a company based on its domain. | | `ZEROBOUNCE_EMAIL_FINDER_DELETE_FILE` | Delete Email Finder File | Tool to delete a file that was submitted for bulk email finding. Use when the file processing status is 'Complete' and you need to remove it. | | `ZEROBOUNCE_EMAIL_FINDER_FILE_STATUS` | Email Finder File Status | Tool to get the processing status of a file submitted for bulk email finding. Use when you need to poll the progress of a bulk email-finder file upload. | | `ZEROBOUNCE_EMAIL_FINDER_SEND_FILE` | Email Finder Send File | Tool to upload a file for bulk email finding. Use when you have lists of names and domains to find emails in bulk via CSV/TXT upload. | | `ZEROBOUNCE_GET_API_USAGE` | Get API Usage | Tool to retrieve API usage statistics for a given period. Use when you need usage metrics between two dates. | | `ZEROBOUNCE_GET_CREDIT_BALANCE` | Get Credit Balance | Tool to retrieve your current ZeroBounce email validation credit balance. Use when you need to monitor remaining credits to avoid service interruptions. | | `ZEROBOUNCE_GET_EMAIL_FINDER_FILE` | Get Email Finder File | Tool to download the results file for a completed bulk email finder job. Use when you have the file_id and the job is complete. | | `ZEROBOUNCE_LIST_EVALUATOR` | List Evaluator | Tool to evaluate the quality of an email list. Use when you have a list of emails and need a quick health check before full validation. | | `ZEROBOUNCE_LIST_FILTERS` | List Filters | Tool to retrieve all email addresses and domains in your allowlist and blocklist filters. Use when you need to view or audit current filter rules before validation. | | `ZEROBOUNCE_SEND_FILE` | Send File | Tool to upload a file for bulk email validation. Use when you need to validate large lists of emails via CSV or TXT file. | | `ZEROBOUNCE_VALIDATE_EMAIL` | Validate Email | Tool to validate a single email address in real time. Use when you need to confirm deliverability and domain details before sending emails. Each call consumes API credits; set `credits_info: true` to include remaining balance in the response and monitor before credits are exhausted. | ## Supported Triggers None listed. ## Creating MCP Server - Stand-alone vs Composio SDK The Zerobounce MCP server connects Claude Cowork to your Zerobounce account through Composio. Once connected, Cowork can use the available Zerobounce tools and triggers to complete tasks on your behalf. ## Complete Code None listed. ## How to build Zerobounce MCP Agent with another framework - [OpenAI Agents SDK](https://composio.dev/toolkits/zerobounce/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/zerobounce/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/zerobounce/framework/claude-code) - [Codex](https://composio.dev/toolkits/zerobounce/framework/codex) - [OpenClaw](https://composio.dev/toolkits/zerobounce/framework/openclaw) - [Hermes](https://composio.dev/toolkits/zerobounce/framework/hermes-agent) - [CLI](https://composio.dev/toolkits/zerobounce/framework/cli) - [Google ADK](https://composio.dev/toolkits/zerobounce/framework/google-adk) - [LangChain](https://composio.dev/toolkits/zerobounce/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/zerobounce/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/zerobounce/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/zerobounce/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/zerobounce/framework/crew-ai) ## Related Toolkits - [Reddit](https://composio.dev/toolkits/reddit) - Reddit is a social news platform with thriving user-driven communities (subreddits). It's the go-to place for discussion, content sharing, and viral marketing. - [Facebook](https://composio.dev/toolkits/facebook) - Facebook is a social media and advertising platform for businesses and creators. It helps you connect, share, and manage content across your public Facebook Pages. - [Linkedin](https://composio.dev/toolkits/linkedin) - LinkedIn is a professional networking platform for connecting, sharing content, and engaging with business opportunities. It's the go-to place for building your professional brand and unlocking new career connections. - [Active campaign](https://composio.dev/toolkits/active_campaign) - ActiveCampaign is a marketing automation and CRM platform for managing email campaigns, sales pipelines, and customer segmentation. It helps businesses engage customers and drive growth through smart automation and targeted outreach. - [ActiveTrail](https://composio.dev/toolkits/active_trail) - ActiveTrail is a user-friendly email marketing and automation platform. It helps you reach subscribers and automate campaigns with ease. - [Ahrefs](https://composio.dev/toolkits/ahrefs) - Ahrefs is an SEO and marketing platform for site audits, keyword research, and competitor insights. It helps you improve search rankings and drive organic traffic. - [Amcards](https://composio.dev/toolkits/amcards) - AMCards lets you create and mail personalized greeting cards online. Build stronger customer relationships with easy, automated card campaigns. - [Beamer](https://composio.dev/toolkits/beamer) - Beamer is a news and changelog platform for in-app announcements and feature updates. 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It helps teams engage audiences and optimize lead generation through detailed analytics. ## Frequently Asked Questions ### 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. --- [See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)