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How to connect ContactOut to Claude

Connect Claude Web, Desktop and Cowork to ContactOut MCP. Find contact emails for acme marketing team, enrich profile for john smith, ceo, and more using natural language, with authentication handled for you.

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ContactOut is a professional profile enrichment and contact discovery API. Find and verify email addresses to power recruiting, sales, and outreach.

25 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 ContactOut account to Claude via Composio Connect, enabling it to find contact emails for Acme marketing team, enrich profile for John Smith, CEO, verify emails for this candidate list, 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 ContactOut with

ChatGPT WorkHermes

Connecting ContactOut to Claude Web, Desktop, and 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 Web, Desktop, and Cowork

4. Connect your ContactOut account

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

For example, ask Claude to:

  • "Find contact emails for Acme marketing team"
  • "Enrich profile for John Smith, CEO"
  • "Verify emails for this candidate list"

It will prompt you to authenticate and authorize access.

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

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

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

Troubleshooting

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

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

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

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

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

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

3. Why does the ContactOut authorization link not work?

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

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

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

The ContactOut connection can expire or lose permission.

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

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

Claude can manage the ContactOut connection for you.

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

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

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

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

Supported Tools

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

Add Campaign Recipients

Add 1-100 recipients to an existing campaign.

Check LinkedIn Contact Availability

Check whether a LinkedIn profile has a personal email, work email, or phone without revealing it or consuming credits.

Count People

Estimate matching people and available personal emails, work emails, and phones from substantive People Search filters without consuming credits.

Create Bulk Email Verification Job

Queue asynchronous deliverability verification for 1-100 email addresses, optionally delivering results to an HTTP or HTTPS callback URL; may consume verifier credits.

Create LinkedIn Contact Info Batch Job

Queue asynchronous contact discovery for 1-1000 LinkedIn profiles, optionally delivering results to a callback URL; may consume credits per profile.

Enrich Companies by Domain

Return company profiles for 1-30 domains; each found company consumes a search credit.

Enrich LinkedIn Profile

Return a professional profile for a regular LinkedIn profile URL, optionally including contact data; may consume search, email, and phone credits.

Enrich Person

Find and enrich one person using a LinkedIn URL, email, or phone; alternatively, provide a name plus employer, education, location, or job-title evidence.

Enrich Person by Email

Return a professional profile matched from an email address, optionally requesting real-time work-email verification.

Find LinkedIn Profile by Email

Resolve an email address to its matching LinkedIn profile URL.

Get API Usage Stats

Return ContactOut API credit usage and quotas for a billing month.

Get Bulk Email Verification Job

Get the status and available per-email results of an asynchronous bulk email-verification job.

Get Campaign

Return one campaign's sequence steps and optionally its performance statistics.

Get Hashed Email Identifiers

Return unordered SHA-256 hashes of normalized personal emails found for 5-100 distinct LinkedIn profiles.

Get LinkedIn Contact Info

Reveal email and optionally phone contact information for one regular LinkedIn profile URL; consumes credits when data is found.

Get LinkedIn Contact Info Batch

Synchronously reveal contact information for 1-100 LinkedIn profiles; may consume email and phone credits per profile.

Get LinkedIn Contact Info Batch Job

Get the status and available results of an asynchronous LinkedIn contact-info batch job.

List Campaigns

Return one page of email campaigns and their lifecycle statuses.

List Decision Makers

Return one page of key decision makers for the best-matching company.

Remove Campaign Recipients

Destructively remove 1-100 recipients from an existing campaign by email.

Search Companies

Return one page of companies matching identity, size, location, industry, technology, revenue, or founding-year filters.

Search People

Return one page of professional profiles matching person, role, employer, education, location, and contact-availability filters.

Start Campaign

Start a draft ContactOut campaign or resume a stopped campaign.

Stop Campaign

Stop a running ContactOut campaign, interrupting its outreach.

Verify Email

Check one email address for valid, invalid, accept-all, disposable, or unknown deliverability.

FRAMEWORKS

How to build ContactOut MCP Agent with another framework

ChatGPT Work logo

ChatGPT Work

Use ContactOut MCP with ChatGPT Work

Hermes logo

Hermes

Use ContactOut MCP with Hermes

FAQ

Frequently asked questions

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

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

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