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How to integrate Carbon Voice MCP with Hermes

Connect Hermes 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.

28 Tools

Introduction

Hermes is a 24/7 autonomous agent that lives on your computer or server — it remembers what it learns and evolves as your usage grows.

This guide explains the easiest and most robust way to connect your Carbon Voice account to Hermes. You can do this through either Composio Connect CLI or Composio Connect MCP. For personal use we recommend the CLI, but you won't go wrong with MCP either.

Also integrate Carbon Voice MCP with

ChatGPTClaude CoworkAtomic Agent

What is Composio Connect?

Composio Connect is a consumer offering that lets anyone plug 1,500+ applications directly into their agent harness — including Hermes. It can:

  • Search and load tools from relevant toolkits on-demand, reducing context usage.
  • Chain multiple tools to accomplish complex workflows via a remote workbench, without excessive back-and-forth with the LLM.
  • Manage app authentication end-to-end with zero manual overhead.

Integrating Carbon Voice with Hermes

Using Composio Connect CLI

1. Install the Composio CLI

Run the install script directly, or paste https://composio.dev/hermes into your Hermes chat box to have it installed for you.

bash
curl -fsSL https://composio.dev/install | bash
Hermes authenticating with Composio

2. Authenticate

Once the CLI is installed, ask Hermes to authenticate with Composio.

3. Connect to Carbon Voice

Ask your agent to connect to Carbon Voice, or simply request any Carbon Voice-related task. Hermes will prompt you to authenticate and authorize access.

4. Done. You're all set with a new Carbon Voice connection.

Using Composio Connect MCP

1. Get your MCP URL and API Key

Go to dashboard.composio.dev and copy your Connect MCP URL and API key.

Copy MCP URL and API key from Composio dashboard

2. Open the Hermes config file

bash
nano ~/.hermes/config.yaml

3. Add the Composio Connect MCP server

bash
mcp_servers:
  composio:
    url: "https://connect.composio.dev/mcp"
    headers:
      x-consumer-api-key: "YOUR_COMPOSIO_API_KEY"
    connect_timeout: 60
    timeout: 180

Save with Ctrl + O, Enter, then exit with Ctrl + X.

4. Restart your Hermes agent

Once restarted, ask your agent to connect to Carbon Voice or request any Carbon Voice-related task. It will prompt you to authenticate and authorize access.

5. Done!

What is the Carbon Voice MCP server, 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.

Way Forward

With Carbon Voice connected, Hermes can now act on your behalf whenever it detects a relevant task or you ask it to.

From here, you can extend Hermes further:

  • Connect more apps: Calendar, Slack, Notion, Linear, and hundreds of others are available through the same Composio Connect setup. Each new integration compounds what Hermes can do for you.
  • Build workflows across tools: Once multiple apps are connected, Hermes can chain actions together — turn an email into a calendar invite, a Slack message into a Linear ticket, or a meeting note into a follow-up draft.
  • Let it learn your patterns: The more you use Hermes, the better it gets at anticipating how you'd handle recurring tasks. Give it feedback on drafts and decisions, and it will adapt.

If you run into trouble or want to share what you've built, join the community or check out the Docs for deeper configuration options.

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

Claude Cowork logo

Claude Cowork

Use Carbon Voice MCP with Claude Cowork

Atomic Agent logo

Atomic Agent

Use Carbon Voice MCP with Atomic Agent

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. Hermes 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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