CosVoice

CosVoice for Grok Bot, Claude, ChatGPT, and Cursor

An office for your AI Bot. CosVoice gives an AI assistant a real phone number (in your area code), a real email address, and a desk that keeps notes. The assistant can place calls for you, book restaurants by phone, answer the calls you miss, and read a written summary of every call. The voice on the line is Grok Voice, full duplex, and it always says it is an AI assistant when asked.

Website: https://cosvoice.com · Setup page written for the assistant: https://cosvoice.com/skill

Connect in one paste

https://cosvoice.com/mcp

Add that as a remote MCP server (Streamable HTTP). CosVoice uses OAuth 2.1 with PKCE and dynamic client registration, so a CosVoice page opens, you sign in, click Allow, and the assistant is connected. There is no API key to copy.

Client	How
Grok Bot / Grok	Settings → Plugins → add a custom MCP server by URL, or install this plugin
Claude (web, desktop, Code)	Add a custom connector / claude mcp add --transport http cosvoice https://cosvoice.com/mcp
ChatGPT	Settings → Connectors → add MCP server by URL (developer mode)
Cursor	Add to Cursor or paste the URL under Settings → MCP

Clients that only support a static header can use a key from Settings → Connect your agent as Authorization: Bearer cv_live_….

Then let the assistant set itself up

Send it: "Set up my CosVoice line in area code 949. Call it Lloyd."

It calls search_numbers, shows you options, and create_line. Payment comes first: if no plan is on file, create_line returns a checkout link for you to complete, then the number is issued.

What it can do

Tool	What it does
get_account, search_numbers, create_line	First-run setup: check the account, find numbers in an area code, create the line
place_call	Call a real number and hold a live conversation on your behalf (async; poll get_call)
book_reservation	Book a table by phone with a time window, fallbacks, seating, occasion, dietary notes
get_call, list_calls, list_reservations, annotate_call	Summaries, structured details, transcripts, outcomes
send_text, list_messages	Texts from and to the line (STOP respected)
list_emails, get_email, forward_email	The line's own inbox
list_contacts, add_contact, remove_contact	Owner, approved, VIP, blocked callers
get_settings, update_settings, set_webhook	Persona, voice, greeting, standing instructions, call.completed webhooks
ack_instructions	Texts you send the line from your own phone arrive as instructions on every tool result; acknowledge when handled
list_history, recent_activity, list_integrations	Unified history, catch-up since a timestamp, partner tools

What this repo contains

• skills/cosvoice/SKILL.md — the skill (same text as https://cosvoice.com/skill)
• .mcp.json — the hosted server entry (type: http, OAuth)
• .grok-plugin/plugin.json and .claude-plugin/plugin.json — plugin manifests
• server.json — the official MCP Registry entry (com.cosvoice/cosvoice)

No code runs on your machine. The plugin only points your client at the hosted server.

Rules the line follows

Never pays or reads out a card. Always says it is an AI assistant when asked. Uses its own number and email as the callback unless you say otherwise. Never claims a booking unless the call outcome says so. Respects STOP for texts.

Pricing

Starter $29/mo (60 min), Plus $69/mo (200 min), Pro $149/mo (600 min), overage $0.25/min. One number per paid month. Details: https://cosvoice.com/pricing

Links

Trust and safety: https://cosvoice.com/trust · FAQ: https://cosvoice.com/faq · Privacy: https://cosvoice.com/privacy · Terms: https://cosvoice.com/terms · Support: [email protected]

MIT licensed. CosVoice is a product of MimesisIQ.