# How to connect The Companies API to Claude

```json
{
  "title": "How to connect The Companies API to Claude",
  "toolkit": "The Companies API",
  "toolkit_slug": "thecompaniesapi",
  "framework": "Claude Cowork",
  "framework_slug": "claude-cowork",
  "url": "https://composio.dev/toolkits/thecompaniesapi/framework/claude-cowork",
  "markdown_url": "https://composio.dev/toolkits/thecompaniesapi/framework/claude-cowork.md",
  "updated_at": "2026-09-10T05:35:45.417Z"
}
```

## 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 The Companies API account to Claude via Composio Connect, enabling it to find a company's tech stack and location, list Fortune 500 companies in healthcare, create target account list for SaaS companies, 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 The Companies API with

- [ChatGPT Work](https://composio.dev/toolkits/thecompaniesapi/framework/chatgpt)
- [Hermes](https://composio.dev/toolkits/thecompaniesapi/framework/hermes-agent)

## Connect The Companies API to Claude Cowork

### Connecting The Companies API 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.
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 the The Companies API MCP server, and what's possible with it?

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

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `THECOMPANIESAPI_CREATE_LIST` | Create List | Create an empty static company list with email notifications disabled. |
| `THECOMPANIESAPI_DELETE_LIST` | Delete List | Permanently delete a company list by ID and return the deleted list record. |
| `THECOMPANIESAPI_ENRICH_JOB_TITLE` | Enrich Job Title | Normalize a job title and infer its department and seniority classification. |
| `THECOMPANIESAPI_GET_ACCOUNT_CONTEXT` | Get Account Context | Return the connected user, current team, subscription state, and remaining credit balance. |
| `THECOMPANIESAPI_GET_COMPANY` | Get Company | Return the cached company profile for an exact domain, optionally in a compact form; this tool does not force a paid refresh. |
| `THECOMPANIESAPI_LIST_COMPANIES_IN_LIST` | List Companies In List | Return one page of companies currently contained in a specified company list. |
| `THECOMPANIESAPI_LIST_LISTS` | List Lists | Return one page of company lists owned by the connected account. |
| `THECOMPANIESAPI_RENAME_LIST` | Rename List | Rename an existing company list without changing its query, synchronization, or notification settings. |
| `THECOMPANIESAPI_SEARCH_COMPANIES` | Search Companies | Search the company database with text or structured segmentation conditions and return one page of matching company profiles. |
| `THECOMPANIESAPI_SEARCH_TAXONOMY` | Search Taxonomy | Search provider taxonomy values for industries, technologies, or geographic levels and return normalized identifiers for company filters. |

## Supported Triggers

None listed.

## Troubleshooting

### 1. Why does Claude not use the Composio connector for The Companies API?

The connector can show as connected, but Claude must use it in each The Companies API conversation.
- Click + at the lower left of the chat, or type /.
- Hover Connectors.
- Turn on Composio.
- Ask Claude to connect to The Companies API again.

### 2. Why does Claude show an MCP server error before The Companies API connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for The Companies API.
- 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 The Companies API.
- If it fails again, send the error and the ofid_ reference id to support@composio.dev.

### 3. Why does the The Companies API authorization link not work?

The Composio connector is one server. Your The Companies API account connects separately when Claude asks for it.
- If the browser does not open, or the link expires, ask Claude to retry the The Companies API connection.
- Composio creates a fresh The Companies API authorization link.
- Open that link in your browser and finish the The Companies API sign-in.

### 4. Why do The Companies API actions fail after they worked before?

The The Companies API connection can expire or lose permission.
- Ask Claude to inspect the The Companies API connection.
- If the connection is unhealthy, disconnect it when Claude prompts you.
- Reconnect the The Companies API account and retry the action.
- If Claude shows a permission prompt, approve it before Claude changes data in The Companies API.
- If the action still fails with a permission error, check that the connected account has that permission in The Companies API itself.

### 5. How do I switch to a different The Companies API account?

Claude can manage the The Companies API connection for you.
- Ask Claude to disconnect or delete the current The Companies API account.
- Ask Claude to connect The Companies API again.
- Open the new Composio authorization link for The Companies API.
- Sign in with the other The Companies API account in the browser.
- After the account connects, ask Claude to retry the The Companies API task.

### 6. Why is my The Companies API connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your The Companies API connection works in Claude Web, Desktop, and Cowork.
- In Claude Desktop, open Customize > Connectors.
- Next to Composio, click ⋮ and click Clear cache.
- If The Companies API 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 The Companies API.

## Creating MCP Server - Stand-alone vs Composio SDK

The The Companies API MCP server connects Claude Web, Desktop, and Cowork to your The Companies API account through Composio. Once connected, Claude can use the available The Companies API tools and triggers to complete tasks on your behalf.

## Complete Code

None listed.

## How to build The Companies API MCP Agent with another framework

- [ChatGPT Work](https://composio.dev/toolkits/thecompaniesapi/framework/chatgpt)
- [Hermes](https://composio.dev/toolkits/thecompaniesapi/framework/hermes-agent)

## Related Toolkits

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- [Clarify MCP](https://composio.dev/toolkits/clarify_mcp) - Clarify MCP is a CRM platform for managing companies, people, deals, meetings, tasks, lists, and campaigns. Use it to centralize CRM data and streamline sales and marketing workflows.
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- [Close](https://composio.dev/toolkits/close) - Close is a CRM platform built for sales teams, combining calling, email automation, and predictive dialers. It streamlines sales workflows and boosts productivity with all-in-one communication tools.
- [Close MCP](https://composio.dev/toolkits/close_mcp) - Close MCP is a CRM MCP exposing leads, contacts, opportunities, activities, communications, and workflows. Use it to give agents scoped, auditable access to your CRM data.

## Frequently Asked Questions

### What are the differences in Tool Router MCP and The Companies API MCP?

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

### Can I manage the permissions and scopes for The Companies API while using Tool Router?

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

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