Carbon Voice MCP server for AI agents and assistants

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.

Carbon Voice MCP logoCarbon Voice MCP
Dcr Oauth

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

28 Tools

Try Carbon Voice MCP now

Type what you want done — sign in and watch it run live in the Tool Router playground.

TOOL ROUTER PLAYGROUND
Carbon Voice MCP
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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.

SETUP GUIDE

Connect Carbon Voice MCP Tool with your Agent

1

Install Composio

typescript
npm install @composio/core ai @ai-sdk/openai @ai-sdk/mcp
Install the Composio SDK for Python or TypeScript
2

Initialize Client and Create Tool Router Session

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}`);
Import and initialize the Composio client, then create a Tool Router session for Carbon Voice MCP
3

Connect to AI Agent

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}`);
Use the MCP server with your AI agent (Anthropic Claude or Mastra)
SETUP GUIDE

Connect Carbon Voice MCP API Tool with your Agent

1

Install Composio

typescript
npm install @composio/openai
Install the Composio SDK
2

Initialize Composio and Create Tool Router Session

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');
Import and initialize Composio client, then create a Tool Router session
3

Execute Carbon Voice MCP Tools via Tool Router with Your Agent

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);
Get tools from Tool Router session and execute Carbon Voice MCP actions with your Agent

Why Use Composio?

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

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

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

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
FRAMEWORKS

Use Carbon Voice MCP with any AI Agent Framework

Choose a Framework you want to connect Carbon Voice MCP with

FAQ

Frequently asked questions

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.

Yes! Composio's Tool Router enables agents to use multiple toolkits. Learn more.

Yes. Composio is SOC 2 Type II compliant and is built to keep your Carbon Voice connection and credentials secure. OAuth tokens and API keys are encrypted, and sensitive customer data is protected at rest and in transit.

Composio also undergoes independent security testing and continuously monitors its systems for security threats. You can review the latest reports and policies in the Composio Trust Center.

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

When you connect a Carbon Voice account through Composio, every action runs under that account, so anything the agent creates, sends, or changes shows up in Carbon Voice as done by you. Keep an approval step in your prompt for actions with side effects, such as sending or deleting, and have the agent draft first.

Whatever the credentials you connect allow inside Carbon Voice. If Carbon Voice lets you scope a key to specific permissions, create a scoped one so the agent can only do what you intend. You can revoke the key inside Carbon Voice at any time.

Yes. Composio supports multiple connected accounts for the same app, and that works in Claude, ChatGPT, or any other assistant you connect through Composio. Give each Carbon Voice connection a name such as work or personal, and the assistant uses the one you mention in the request. Each account keeps its own credentials and nothing is merged.

Composio's free plan includes 100,000 tool calls per month with no credit card, which covers most personal Carbon Voice use. Paid plans add higher limits and team features. Your Carbon Voice plan and its API limits still apply as usual.

Built-in connectors usually give one AI access to a limited set of apps. Many people use Composio because it lets their AI connect to more apps than it normally supports, or connect to multiple accounts for the same app (e.g. connect Claude to multiple Carbon Voice accounts).

With Composio, you connect Carbon Voice once and then use it across different AI assistants without setting it up separately in each one. Connect your apps to Composio once, then connect Composio to whichever AI you use, whether that's Claude, ChatGPT, Hermes, or your own custom assistant.

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