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How to connect Carbon Voice MCP to Claude

Connect Claude Web, Desktop and Cowork 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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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 Carbon Voice account to Claude via Composio Connect, enabling it to summarize today's missed voice messages, send a voice reply to Alice, list active conversations needing follow up, 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 Carbon Voice MCP with

ChatGPTHermes

Connecting Carbon Voice to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

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

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

2. 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

3. Connect your Carbon Voice account

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

For example, ask Claude to:

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

It will prompt you to authenticate and authorize access.

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

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

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

Troubleshooting

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

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

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

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

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

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

3. Why does the Carbon Voice authorization link not work?

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

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

4. Why do Carbon Voice actions fail after they worked before?

The Carbon Voice connection can expire or lose permission.

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

5. How do I switch to a different Carbon Voice account?

Claude can manage the Carbon Voice connection for you.

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

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

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

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

How to build Carbon Voice MCP Agent with another framework

ChatGPT logo

ChatGPT

Use Carbon Voice MCP with ChatGPT

Hermes logo

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. 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 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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