# Carbon Voice MCP

```json
{
  "name": "Carbon Voice MCP",
  "slug": "carbon_voice_mcp",
  "url": "https://composio.dev/toolkits/carbon_voice_mcp",
  "markdown_url": "https://composio.dev/toolkits/carbon_voice_mcp.md",
  "logo_url": "https://logos.composio.dev/api/carbon_voice_mcp",
  "categories": [
    "collaboration & communication"
  ],
  "is_composio_managed": false,
  "updated_at": "2026-09-02T05:34:34.408Z"
}
```

![Carbon Voice MCP logo](https://logos.composio.dev/api/carbon_voice_mcp)

## Description

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Carbon Voice MCP or direct API to fetch voice messages, transcribe voicemails, send voice replies, and manage conversations and workflows through natural language.

## Summary

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

## Categories

- collaboration & communication

## Toolkit Details

- Tools: 28

## Images

- Logo: https://logos.composio.dev/api/carbon_voice_mcp

## Authentication

- **Dcr Oauth**
  - Type: `custom`
  - Description: Dcr Oauth authentication for Carbon Voice MCP.
  - Setup:
    - Configure Dcr Oauth credentials for Carbon Voice MCP.
    - Use the credentials when creating an auth config in Composio.

## Suggested Prompts

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

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `CARBON_VOICE_MCP_ADD_ATTACHMENTS_TO_MESSAGE` | Add attachments to message | Add attachments to a message. In order to add attachments to a message, you must provide a message id and the attachments. |
| `CARBON_VOICE_MCP_CREATE_CONVERSATION_MESSAGE` | Create conversation message | Sends a message to an existing conversation or any type with a conversation_id. To reply as a thread, included a message_id for "parent_id". You must provide a transcript or attachment. |
| `CARBON_VOICE_MCP_CREATE_DIRECT_MESSAGE` | Create direct message | Send a Direct Message (DM) to a User or a Group of Users. In order to create a Direct Message, you must provide transcript or link attachments. |
| `CARBON_VOICE_MCP_CREATE_FOLDER` | Create folder | Create a new folder. |
| `CARBON_VOICE_MCP_CREATE_VOICEMEMO_MESSAGE` | Create voicememo message | Create a VoiceMemo Message. In order to create a VoiceMemo Message, you must provide a transcript or link attachments. |
| `CARBON_VOICE_MCP_DELETE_FOLDER` | Delete folder | Delete a folder by its ID. Deleting a folder will also delete nested folders and all the messages in referenced folders. (This is a destructive action and cannot be undone, so please be careful.) |
| `CARBON_VOICE_MCP_GET_AI_ACTION_RESPONSES` | Get ai action responses | Retrieve previously generated AI Action (Prompt) responses by filtering for a specific prompt, message, or conversation ID. Combine filters to narrow results and view all AI-generated responses related to a particular prompt, message, or conversation. |
| `CARBON_VOICE_MCP_GET_CONVERSATION` | Get conversation | Get a conversation by its ID. |
| `CARBON_VOICE_MCP_GET_CONVERSATION_USERS` | Get conversation users | Get users in a conversation. |
| `CARBON_VOICE_MCP_GET_CURRENT_USER` | Get current user | Get the current user information. |
| `CARBON_VOICE_MCP_GET_FOLDER` | Get folder | Get a folder by its ID. |
| `CARBON_VOICE_MCP_GET_FOLDER_WITH_MESSAGES` | Get folder with messages | Get a folder including its messages by its ID. (Only messages at folder level are returned.) |
| `CARBON_VOICE_MCP_GET_MESSAGE` | Get message | Get a message by its ID. |
| `CARBON_VOICE_MCP_GET_RECENT_MESSAGES` | Get recent messages | Get most recent messages, including their associated Conversation, Creator, and Labels information. Returns a maximum of 10 messages. |
| `CARBON_VOICE_MCP_GET_ROOT_FOLDERS` | Get root folders | Lists all root folders for a given workspace, including their names, IDs, and basic structure, but does not provide aggregate counts.(Required to inform message type:voicememo,prerecorded) |
| `CARBON_VOICE_MCP_GET_USER` | Get user | Get detailed information about a specific user by their ID. Returns the full user profile — name, languages, voice settings, workspace memberships and roles, notification preferences, and timestamps. This is richer than `search_user` (which only finds users by phone, email, or name). Use this when you already have a user ID and need their complete information. |
| `CARBON_VOICE_MCP_GET_WORKSPACES_BASIC_INFO` | Get workspaces basic info | Get basic information about a workspace. |
| `CARBON_VOICE_MCP_LIST_AI_ACTIONS` | List ai actions | List AI Actions (Prompts). Optionally, you can filter by owner type and workspace id. Filtering by owner type, Possible values: "user", "workspace", "system". Do not use unless the user explicitly requests it. |
| `CARBON_VOICE_MCP_LIST_CONVERSATIONS` | List conversations | List all conversations. Returns a simplified view of user conversations that have had messages sent or received within the last 6 months. Each result includes id, name, workspace_id, and type (directMessage, customerConversation, namedConversation, or asyncMeeting). |
| `CARBON_VOICE_MCP_LIST_MESSAGES` | List messages | List Messages. By default returns latest 20 messages. The maximum allowed range between dates is 183 days (6 months). All presigned URLs returned by this tool are ready to use. Do not parse, modify, or re-encode them—always present or use the URLs exactly as received.If you want to get messages from a specific date range, you can use the "start_date" and "end_date" parameters. If you want to get messages from a specific date, you can use the "date" parameter. If you want to get messages from a specific user, you can use the "user_ids" parameter. If you want to get messages from a specific conversation, you can use the "conversation_id" parameter. If you want to get messages from a specific folder, you can use the "folder_id" parameter. If you want to get messages from a specific workspace, you can use the "workspace_id" parameter. If you want to get messages for a particular language, you can use the "language" parameter. |
| `CARBON_VOICE_MCP_MOVE_FOLDER` | Move folder | Move a folder by its ID. Move a Folder into another Folder or into a Workspace. |
| `CARBON_VOICE_MCP_MOVE_MESSAGE_TO_FOLDER` | Move message to folder | Move a message to a folder by its ID. Move a Message into another Folder or into a Workspace. Only allowed to move messages of type: voicememo,prerecorded. |
| `CARBON_VOICE_MCP_RUN_AI_ACTION` | Run ai action | Run an AI Action (Prompt) for a message. You can run an AI Action for a message by its ID or a list of message IDs. |
| `CARBON_VOICE_MCP_RUN_AI_ACTION_FOR_SHARED_LINK` | Run ai action for shared link | Run an AI Action (Prompt) for a shared link. You can run an AI Action for a shared link by its ID or a list of shared link IDs. You can also provide the language of the response. |
| `CARBON_VOICE_MCP_SEARCH_USER` | Search user | Search for a User by their phone number, email address, id or name. (In order to search for a User, you must provide a phone number, email address, id or name.)When searching by name, only users that are part of your contacts will be returned |
| `CARBON_VOICE_MCP_SEARCH_USERS` | Search users | Search multiple Users by their phone numbers, email addresses, ids or names. (In order to search Users, you must provide phone numbers, email addresses, ids or names.)When searching by name, only users that are part of your contacts will be returned |
| `CARBON_VOICE_MCP_SUMMARIZE_CONVERSATION` | Summarize conversation | Summarize a conversation. |
| `CARBON_VOICE_MCP_UPDATE_FOLDER_NAME` | Update folder name | Update a folder name by its ID. |

## Supported Triggers

None listed.

## Installation and MCP Setup

### Path 1: SDK Installation

#### Path 1, Step 1: Install Composio

Install the Composio SDK
```python
pip install composio_openai
```

```typescript
npm install @composio/openai
```

#### Path 1, Step 2: Initialize Composio and Create Tool Router Session

Import and initialize Composio client, then create a Tool Router session
```python
from openai import OpenAI
from composio import Composio
from composio_openai import OpenAIResponsesProvider

composio = Composio(provider=OpenAIResponsesProvider())
openai = OpenAI()
session = composio.create(user_id='your-user-id')
```

```typescript
import OpenAI from 'openai';
import { Composio } from '@composio/core';
import { OpenAIResponsesProvider } from '@composio/openai';

const composio = new Composio({
  provider: new OpenAIResponsesProvider(),
});
const openai = new OpenAI({});
const session = await composio.create('your-user-id');
```

#### Path 1, Step 3: Execute Carbon Voice MCP Tools via Tool Router with Your Agent

Get tools from Tool Router session and execute Carbon Voice MCP actions with your Agent
```python
tools = session.tools
response = openai.responses.create(
  model='gpt-4.1',
  tools=tools,
  input=[{
    'role': 'user',
    'content': 'YOUR_SPECIFIC_PROMPT_HERE'
  }]
)
result = composio.provider.handle_tool_calls(
  response=response,
  user_id='your-user-id'
)
print(result)
```

```typescript
const tools = session.tools;
const response = await openai.responses.create({
  model: 'gpt-4.1',
  tools: tools,
  input: [{
    role: 'user',
    content: 'YOUR_SPECIFIC_PROMPT_HERE'
  }],
});
const result = await composio.provider.handleToolCalls(
  'your-user-id',
  response.output
);
console.log(result);
```

### Path 2: MCP Server Setup

#### Path 2, Step 1: Install Composio

Install the Composio SDK for Python or TypeScript
```python
pip install composio claude-agent-sdk
```

```typescript
npm install @composio/core ai @ai-sdk/openai @ai-sdk/mcp
```

#### Path 2, Step 2: Initialize Client and Create Tool Router Session

Import and initialize the Composio client, then create a Tool Router session for Carbon Voice MCP
```python
from composio import Composio
from claude_agent_sdk import ClaudeSDKClient, ClaudeAgentOptions

composio = Composio(api_key='your-composio-api-key')
session = composio.create(user_id='your-user-id')
url = session.mcp.url
```

```typescript
import { Composio } from '@composio/core';

const composio = new Composio({ apiKey: 'your-api-key' });
const session = await composio.create('your-user-id');
console.log(`Tool Router session created: ${session.mcp.url}`);
```

#### Path 2, Step 3: Connect to AI Agent

Use the MCP server with your AI agent (Anthropic Claude or Mastra)
```python
import asyncio

options = ClaudeAgentOptions(
    permission_mode='bypassPermissions',
    mcp_servers={
        'tool_router': {
            'type': 'http',
            'url': url,
            'headers': {
                'x-api-key': 'your-composio-api-key'
            }
        }
    },
    system_prompt='You are a helpful assistant with access to Carbon Voice MCP tools.',
    max_turns=10
)

async def main():
    async with ClaudeSDKClient(options=options) as client:
        await client.query('YOUR_SPECIFIC_PROMPT_HERE')
        async for message in client.receive_response():
            if hasattr(message, 'content'):
                for block in message.content:
                    if hasattr(block, 'text'):
                        print(block.text)

asyncio.run(main())
```

```typescript
import { openai } from '@ai-sdk/openai';
import { experimental_createMCPClient as createMCPClient } from '@ai-sdk/mcp';
import { generateText } from 'ai';

const client = await createMCPClient({
  transport: {
    type: 'http',
    url: session.mcp.url,
    headers: {
      'x-api-key': 'your-composio-api-key',
    },
  },
});

const tools = await client.tools();
const { text } = await generateText({
  model: openai('gpt-4o'),
  tools,
  messages: [{
    role: 'user',
    content: 'YOUR_SPECIFIC_PROMPT_HERE'
  }],
  maxSteps: 5,
});

console.log(`Agent: ${text}`);
```

## Why Use Composio?

### 1. AI Native Carbon Voice MCP Integration

- Supports both Carbon Voice MCP and direct API based integrations
- Structured, LLM-friendly schemas for reliable tool execution
- Rich coverage for reading, writing, and querying your Carbon Voice MCP data

### 2. Managed Auth

- Built-in OAuth handling with automatic token refresh and rotation
- Central place to manage, scope, and revoke Carbon Voice MCP access
- Per user and per environment credentials instead of hard-coded keys

### 3. Agent Optimized Design

- Tools are tuned using real error and success rates to improve reliability over time
- Comprehensive execution logs so you always know what ran, when, and on whose behalf

### 4. Enterprise Grade Security

- Fine-grained RBAC so you control which agents and users can access Carbon Voice MCP
- Scoped, least privilege access to Carbon Voice MCP resources
- Full audit trail of agent actions to support review and compliance

## Use Carbon Voice MCP with any AI Agent Framework

Choose a framework you want to connect Carbon Voice MCP with:

- [ChatGPT](https://composio.dev/toolkits/carbon_voice_mcp/framework/chatgpt)
- [Claude Cowork](https://composio.dev/toolkits/carbon_voice_mcp/framework/claude-cowork)
- [Hermes](https://composio.dev/toolkits/carbon_voice_mcp/framework/hermes-agent)
- [Atomic Agent](https://composio.dev/toolkits/carbon_voice_mcp/framework/atomic-agent)

## Related Toolkits

- [Gmail](https://composio.dev/toolkits/gmail) - Gmail is Google's email service with powerful spam protection, search, and G Suite integration. It keeps your inbox organized and makes communication fast and reliable.
- [Outlook](https://composio.dev/toolkits/outlook) - Outlook is Microsoft's email and calendaring platform for unified communications and scheduling. It helps users stay organized with powerful email, contacts, and calendar management.
- [Slack](https://composio.dev/toolkits/slack) - Slack is a channel-based messaging platform for teams and organizations. It helps people collaborate in real time, share files, and connect all their tools in one place.
- [Gong](https://composio.dev/toolkits/gong) - Gong is a platform for video meetings, call recording, and team collaboration. It helps teams capture conversations, analyze calls, and turn insights into action.
- [Microsoft teams](https://composio.dev/toolkits/microsoft_teams) - Microsoft Teams is a collaboration platform that combines chat, meetings, and file sharing within Microsoft 365. It keeps distributed teams connected and productive through seamless virtual communication.
- [Slackbot](https://composio.dev/toolkits/slackbot) - Slackbot is a conversational automation tool for Slack that handles reminders, notifications, and automated responses. It boosts team productivity by streamlining onboarding, answering FAQs, and managing timely alerts—all right inside Slack.
- [2chat](https://composio.dev/toolkits/_2chat) - 2chat is an API platform for WhatsApp and multichannel text messaging. It streamlines chat automation, group management, and real-time messaging for developers.
- [Agent mail](https://composio.dev/toolkits/agent_mail) - Agent mail provides AI agents with dedicated email inboxes for sending, receiving, and managing emails. It empowers agents to communicate autonomously with people, services, and other agents—no human intervention needed.
- [Android Texter](https://composio.dev/toolkits/android_texter) - Android Texter is an API service that connects Android phones to SMS, MMS, contacts, and device data. Use it to automate mobile messaging without building your own phone-to-API bridge.
- [Basecamp](https://composio.dev/toolkits/basecamp) - Basecamp is a project management and team collaboration tool by 37signals. It helps teams organize tasks, share files, and communicate efficiently in one place.
- [Blooio](https://composio.dev/toolkits/blooio) - Blooio is a stable v2 API platform for messaging, chats, contacts, groups, phone numbers, and account analytics. It gives teams a clean way to build reliable communication workflows without stitching together fragile custom APIs.
- [CallOnTheGo](https://composio.dev/toolkits/callonthego) - CallOnTheGo is a telephony API for managing phone numbers, caller IDs, suppression lists, audio assets, contact lists, and Voice AI campaigns. It provides programmatic control over calling infrastructure and campaign automation for scalable voice outreach.
- [CardClan](https://composio.dev/toolkits/cardclan) - CardClan is a digital card platform for creating and sending personalized team cards. Use it to celebrate moments, share card links, and manage card workflows without extra coordination.
- [Chatwork](https://composio.dev/toolkits/chatwork) - Chatwork is a team communication platform with group chats, file sharing, and task management. It helps businesses boost collaboration and streamline productivity.
- [Clickmeeting](https://composio.dev/toolkits/clickmeeting) - ClickMeeting is a cloud-based platform for running online meetings and webinars. It helps businesses and individuals host, manage, and engage virtual audiences with ease.
- [Confluence](https://composio.dev/toolkits/confluence) - Confluence is Atlassian's team collaboration and knowledge management platform. It helps your team organize, share, and update documents and project content in one secure workspace.
- [Daily](https://composio.dev/toolkits/daily) - Daily is a WebRTC video and audio API platform for building rooms, meetings, recordings, live streams, transcriptions, and telephony. It gives developers reliable real-time media infrastructure without managing complex conferencing stacks.
- [Dailybot](https://composio.dev/toolkits/dailybot) - DailyBot streamlines team collaboration with chat-based standups, reminders, and polls. It keeps work flowing smoothly in your favorite messaging platforms.
- [Dialmycalls](https://composio.dev/toolkits/dialmycalls) - Dialmycalls is a mass notification service for sending voice and text messages to contacts. It helps teams and organizations quickly broadcast urgent alerts and updates.
- [Dialpad](https://composio.dev/toolkits/dialpad) - Dialpad is a cloud-based business phone and contact center system for teams. It unifies voice, video, messaging, and meetings across your devices.

## Frequently Asked Questions

### Do I need my own developer credentials to use Carbon Voice MCP with Composio?

Yes, Carbon Voice MCP requires you to configure your own Dcr Oauth credentials. Once set up, Composio handles secure credential storage and management for you.

### Can I use multiple toolkits together?

Yes! Composio's Tool Router enables agents to use multiple toolkits. [Learn more](https://docs.composio.dev/tool-router/overview).

### Is Composio secure?

Composio is SOC 2 and ISO 27001 compliant with all data encrypted in transit and at rest. [Learn more](https://trust.composio.dev).

### What if the API changes?

Composio maintains and updates all toolkit integrations automatically, so your agents always work with the latest API versions.

---
[See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)