How to connect 44API to Claude Cowork

Connect Claude Cowork to 44API MCP. Validate a customer's eu vat number, look up company details by tax id, and more using natural language, with authentication handled for you.

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44API

Api Key

44API is an API service for validating VAT and tax identifiers and returning company details. Use it to verify business tax data and manage account IP whitelists quickly.

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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 44API account to Cowork via Composio Connect, enabling it to validate a customer's EU VAT number, look up company details by tax ID, add office IP to 44API whitelist, and more such actions on your behalf without compromising your account security.

Also integrate 44API with

ChatGPT Work Hermes

Connecting 44API 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 44API account

Back in Cowork, ask the agent to connect to 44API or give it any 44API-related task.

For example, ask Cowork to:

"Validate a customer's EU VAT number"
"Look up company details by tax ID"
"Add office IP to 44API whitelist"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Cowork, and your 44API 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 44API through MCP without you sharing account credentials directly with the agent.

What is the 44API MCP server, and what's possible with it?

The 44API MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your 44API account. It provides structured and secure access so your agent can perform 44API operations on your behalf.

TOOLS

Supported Tools

Every 44API action and event your agent gets out of the box.

Add Whitelisted IP

Add one IPv4 or IPv6 address to the account whitelist using a verification email address.

List Whitelisted IPs

List IP addresses currently allowed by the account whitelist.

Remove Whitelisted IP

Remove one IPv4 or IPv6 address from the account whitelist.

Validate VAT Number

Validate one VAT or tax ID for a supported country and return its validity plus any company details available on the connected plan.

FRAMEWORKS

How to build 44API MCP Agent with another framework

ChatGPT Work

Use 44API MCP with ChatGPT Work

Hermes

Use 44API MCP with Hermes

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FAQ

Frequently asked questions

With a standalone 44API MCP server, the agents and LLMs can only access a fixed set of 44API tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from 44API 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 44API tools.

Yes, absolutely. You can configure which 44API 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 44API data and credentials are handled as safely as possible.

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