Carbon Voice for AI agents

Carbon Voice connects to a team's voice messages and conversations, letting an agent search, summarize, and act on what was actually said. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect Carbon Voice See the 28 actions ↓

CommunicationOAuth 2.0 (MCP)MCP + RESTcarbonvoice.app

AUDIT LOG · CARBON VOICEPOLICY: acme-support

09:41:07 · claude · u_8f2read

carbon_voice.list_messages

List messages✓ allowed · 212ms

09:41:08 · claude · u_8f2read

carbon_voice.get_user

Get user✓ allowed · 164ms

09:41:09 · claude · u_8f2write

carbon_voice.create_folder

Create folder✓ approved · approved by user

09:41:12 · claude · u_8f2destructive

carbon_voice.delete_folder

Delete folder✕ blocked · policy: deny

EVERY CARBON VOICE CALL, ON THE RECORD

01 · USE CASES

What agents do in Carbon Voice.

Summarize a conversation

Summarize a long voice conversation thread instead of someone re-listening to every message.

Search recent messages

Search across recent voice messages for a specific topic before replying to a thread.

Confirm before deleting a folder

Confirm before deleting a folder, since every message filed inside it is removed too.

02 · ACTIONS

28 Carbon Voice actions, graded by risk.

Every Carbon Voice action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

Look things up. Allowed by default.

carbon_voice.get_user
Get user
carbon_voice.get_folder
Get folder
carbon_voice.get_message
Get message
carbon_voice.search_user
Search user
carbon_voice.search_users
Search users
carbon_voice.list_messages
List messages
carbon_voice.list_ai_actions
List ai actions
carbon_voice.get_conversation
Get conversation
carbon_voice.get_current_user
Get current user
carbon_voice.get_root_folders
Get root folders
carbon_voice.list_conversations
List conversations
carbon_voice.get_recent_messages
Get recent messages
carbon_voice.get_conversation_users
Get conversation users
carbon_voice.get_ai_action_responses
Get ai action responses
carbon_voice.get_folder_with_messages
Get folder with messages
carbon_voice.get_workspaces_basic_info
Get workspaces basic info

+ 1 MORE

write

Create and change things. Allow, or ask the user first.

carbon_voice.create_folder
Create folder
carbon_voice.update_folder_name
Update folder name
carbon_voice.create_direct_message
Create direct message
carbon_voice.create_voicememo_message
Create voicememo message
carbon_voice.add_attachments_to_message
Add attachments to message
carbon_voice.create_conversation_message
Create conversation message
carbon_voice.move_folder
Move folder
carbon_voice.run_ai_action
Run ai action
carbon_voice.move_message_to_folder
Move message to folder
carbon_voice.run_ai_action_for_shared_link
Run ai action for shared link

destructive

Delete, cancel or archive. Ask first, or deny outright.

carbon_voice.delete_folder
Delete folder

03 · HOW IT WORKS

Carbon Voice in three steps.

01Your users connect Carbon VoiceThey sign in to Carbon Voice on Arc0 Connect, under your brand, and approve the access you ask for.
02You set the rulesReads run, writes like “create folder” can wait for the user, and “delete folder” can be denied outright.
03Any agent can actYour agent calls Carbon Voice through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.

POLICY.TS

await arc0.policies.set('carbon_voice', {
  read: 'allow',
  write: 'ask',        // create_folder
  destructive: 'deny',  // delete_folder
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2

04 · AUTH AND DATA

How Carbon Voice connects.

Carbon Voice runs its own MCP server behind OAuth. Arc0 registers the client, users approve access on Arc0 Connect, and your agent reaches Carbon Voice through the same endpoint, policies and audit log as every other app.

The same Carbon Voice connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH: OAuth 2.0 (MCP)
CREDENTIALS: Per-tenant encrypted vault
MODEL SEES: Results only, never credentials
AUDIT LOG: Every call, on every plan

05 · WORKS WITH

Use Carbon Voice from any agent.

Claude

ChatGPT

Cursor

Codex

VS Code

OpenAI Agents SDK

Claude Agent SDK

Vercel AI SDK

Mastra

LangGraph

06 · RELATED

More communication apps.

Slack168 actions

Microsoft Teams174 actions

Android Texter11 actions

Dialpad192 actions

ALL COMMUNICATION APPS →

07 · FAQ

Carbon Voice and Arc0, answered.

Q01

Can I use Carbon Voice with Claude, ChatGPT or Cursor?

Yes. Connect Carbon Voice to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Carbon Voice actions you allow.

Q02

How do users connect Carbon Voice?

Q03

Which Carbon Voice actions can my agent take?

28 in total: 17 read, 10 write and 1 destructive, such as “create folder”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Carbon Voice?

Yes. Actions like “delete folder” are graded destructive. Set destructive actions to deny, or to ask so the user approves each one, and blocked calls still show up on the audit log.

Q05

Can my own backend call Carbon Voice too?

Yes. The same Carbon Voice connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug Carbon Voice into your agent.

Your users connect Carbon Voice once, under your brand. Your agent gets 28 actions behind your policies, with every call on the record.

Connect Carbon Voice Browse all apps →

Free to build · MCP + REST · Audit log on every plan