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How to connect The Companies API MCP with ChatGPT

Connect ChatGPT to The Companies API MCP. Find a company's tech stack and location, list fortune 500 companies in healthcare, and more using natural language, with authentication handled for you.

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The Companies API is a business intelligence service for searching, enriching, and analyzing company data. Use it to discover company profiles, technologies, locations, lists, and related business intelligence.

10 Tools

How to connect The Companies API MCP with ChatGPT

ChatGPT can take action across your apps and files, stay with a project for hours, and turn a goal into finished materials like sheets, slides, and docs, not just answers.

In this guide, I will explain the easiest and most secure way to connect your The Companies API account to ChatGPT via Composio Connect, so it can search company profiles, enrich records, build target account lists, and export lists through natural language commands without ever putting your account credentials at risk.

Also integrate The Companies API with

Claude CoworkHermesAtomic Agent

Why use Composio over default connectors?

  • Apps with read and write access. Default connectors mostly can read your data. Composio's The Companies API integration lets ChatGPT take actions like creating drafts, sending updates, labeling records, and more.
  • 1,500+ SaaS toolkits out of the box. Composio gives you instant access to a vast catalog of pre-built connectors, from Gmail and Slack to Notion, Linear, and Salesforce.
  • One MCP server for every app. Connect any of your applications on demand through a single endpoint, rather than juggling a separate server for each app.
  • Smart, context-aware tool loading. Unlike traditional MCP servers that dump every available tool into the LLM context window, Composio searches for and loads only the tools relevant to the task at hand.
  • Cross-app automation. Chain actions across multiple apps in a single run - fetch a thread, summarize it in Notion, and post highlights to Slack without leaving the conversation.

Prerequisites

  • A ChatGPT account. We will use the ChatGPT desktop app, and the steps are the same on the web.
  • Access to the The Companies API workspace you want to connect.
  • Composio plugin.

Note: Composio connects through OAuth. You will be asked to sign in and approve specific permissions. Review the permission screen carefully if you are using a work account.

Step-by-step: Connect The Companies API to ChatGPT

1. Install the Composio plugin

Click the button. ChatGPT opens the Composio plugin page. Click Install plugin.

Install in ChatGPT

Composio plugin page in ChatGPT with the Install plugin button

You can also find it inside ChatGPT: go to Settings, open Plugins, search the marketplace for Composio, and click Install plugin.

2. Authenticate

After you install, ChatGPT asks you to authenticate with Composio. Log in and click Allow access to authorize ChatGPT to use your Composio account.

Composio login and Allow access screen for ChatGPT

3. Start using Composio

That is it. Composio tools are now available in ChatGPT. Type @Composio followed by your request, for example @Composio find unread The Companies API messages and summarize them, and it will run the actions you authorize. On first use it asks you to authorize The Companies API.

Option 2: Add Composio as an MCP server

If you cannot use the plugin marketplace, add Composio as a custom MCP server instead.

1. Open the MCP settings

In ChatGPT, go to Settings and open the Plugins section. Inside the Plugins page, click the MCP tab.

ChatGPT settings showing the Plugins page with the MCP tab selected

2. Add the server

Click Add server. In the Name field enter Composio, for Type select Streamable HTTP, and in the URL field paste the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
ChatGPT Add server dialog with the name Composio, type Streamable HTTP, and the Composio MCP URL

Then click Save. The Composio server now appears in your MCP plugins list.

ChatGPT Plugins page showing the Composio MCP server added to the list

3. Authenticate

Click Authenticate on the Composio entry, log in via Composio, and click Allow access. Composio tools are then available in ChatGPT the same way as with the plugin.

What you can do after connecting The Companies API

  • Find a company's tech stack and location
  • List Fortune 500 companies in healthcare
  • Create target account list for SaaS companies

Security + privacy notes (important)

  • Use least-privilege access: Only grant permissions you actually need.
  • Review OAuth permissions before approving: Make sure requested scopes match what you expect Composio and ChatGPT to do.
  • Keep write actions human-reviewed: For actions like sending messages, creating labels, or editing drafts, keep manual confirmation enabled.
  • Be careful with sensitive data: Avoid using this setup with highly sensitive information unless allowed by your personal, company, or client policies.
TOOLS

Supported Tools

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

Create List

Create an empty static company list with email notifications disabled.

Delete List

Permanently delete a company list by ID and return the deleted list record.

Enrich Job Title

Normalize a job title and infer its department and seniority classification.

Get Account Context

Return the connected user, current team, subscription state, and remaining credit balance.

Get Company

Return the cached company profile for an exact domain, optionally in a compact form; this tool does not force a paid refresh.

List Companies In List

Return one page of companies currently contained in a specified company list.

List Lists

Return one page of company lists owned by the connected account.

Rename List

Rename an existing company list without changing its query, synchronization, or notification settings.

Search Companies

Search the company database with text or structured segmentation conditions and return one page of matching company profiles.

Search Taxonomy

Search provider taxonomy values for industries, technologies, or geographic levels and return normalized identifiers for company filters.

FRAMEWORKS

How to build The Companies API MCP Agent with another framework

Claude Cowork logo

Claude Cowork

Use The Companies API MCP with Claude Cowork

Hermes logo

Hermes

Use The Companies API MCP with Hermes

Atomic Agent logo

Atomic Agent

Use The Companies API MCP with Atomic Agent

FAQ

Frequently asked questions

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.

Yes, you can. ChatGPT 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.

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.

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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