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How to connect Carbon Voice MCP with ChatGPT

Connect ChatGPT to Carbon Voice MCP. Summarize today's missed voice messages, send a voice reply to alice, and more using natural language, with authentication handled for you.

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Carbon Voice MCP is a voice-first collaboration platform for messages, conversations, and workflows. Use it to centralize voice communications and streamline team collaboration.

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How to connect Carbon Voice 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 Carbon Voice account to ChatGPT via Composio Connect, so it can fetch voice messages, transcribe and summarize voicemails, send voice replies, manage conversations, and coordinate collaboration workflows through natural language commands without ever putting your account credentials at risk.

Also integrate Carbon Voice MCP with

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Why use Composio over default connectors?

  • Apps with read and write access. Default connectors mostly can read your data. Composio's Carbon Voice 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 Carbon Voice 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 Carbon Voice 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 Carbon Voice messages and summarize them, and it will run the actions you authorize. On first use it asks you to authorize Carbon Voice.

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 Carbon Voice

  • Summarize today's missed voice messages
  • Send a voice reply to Alice
  • List active conversations needing follow up

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 Carbon Voice MCP action and event your agent gets out of the box.

Add attachments to message

Add attachments to a message.

Create conversation message

Sends a message to an existing conversation or any type with a conversation_id.

Create direct message

Send a Direct Message (DM) to a User or a Group of Users.

Create folder

Create a new folder.

Create voicememo message

Create a VoiceMemo Message.

Delete folder

Delete a folder by its ID.

Get ai action responses

Retrieve previously generated AI Action (Prompt) responses by filtering for a specific prompt, message, or conversation ID.

Get conversation

Get a conversation by its ID.

Get conversation users

Get users in a conversation.

Get current user

Get the current user information.

Get folder

Get a folder by its ID.

Get folder with messages

Get a folder including its messages by its ID.

Get message

Get a message by its ID.

Get recent messages

Get most recent messages, including their associated Conversation, Creator, and Labels information.

Get root folders

Lists all root folders for a given workspace, including their names, IDs, and basic structure, but does not provide aggregate counts.

Get user

Get detailed information about a specific user by their ID.

Get workspaces basic info

Get basic information about a workspace.

List ai actions

List AI Actions (Prompts).

List conversations

List all conversations.

List messages

List Messages.

Move folder

Move a folder by its ID.

Move message to folder

Move a message to a folder by its ID.

Run ai action

Run an AI Action (Prompt) for a message.

Run ai action for shared link

Run an AI Action (Prompt) for a shared link.

Search user

Search for a User by their phone number, email address, id or name.

Search users

Search multiple Users by their phone numbers, email addresses, ids or names.

Summarize conversation

Summarize a conversation.

Update folder name

Update a folder name by its ID.

FRAMEWORKS

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Claude Cowork

Use Carbon Voice MCP with Claude Cowork

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Hermes

Use Carbon Voice MCP with Hermes

FAQ

Frequently asked questions

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

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

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