Get your line.
Pick a number in your area code. About a minute. Activate for $3.
Muse can send mail, book travel, and act in the apps you connect. It cannot pick up a phone. CosVoice is the phone: a real number and email address that Muse uses on your behalf, so the places that only answer a phone are no longer out of reach.
Pick a number in your area code. About a minute. Activate for $3.
In your dashboard, open Connect your agent and create an API key. It is shown once. Keep it somewhere safe.
Paste the block below into Muse. When it asks for the key, use its secure prompt, not the chat window, so the key stays out of your message history.
I have a CosVoice line: a real phone number and email address for you to use on my behalf.
Build a connector for it from the spec at https://cosvoice.com/openapi.json
Base URL: https://cosvoice.com/api/v1
Auth: Authorization: Bearer <my CosVoice API key> — ask me for the key through your secure credential prompt, never in chat.
How it works: POST /calls with "to" and "purpose" written the way I would say it, including what to accept if the first answer is no. The call takes a few minutes. Poll GET /calls/{id} until status is completed, then tell me the outcome and the details it captured.
Always ask me before you place a call, and tell me who you are about to ring and why.Assistants that speak MCP connect to CosVoice by pasting one address. Muse builds its own connector instead, from our published spec at cosvoice.com/openapi.json, and holds your key in its credential store. Both roads end in the same place: Muse asks, the line calls, you get the write-up.
If Muse gains one-click connectors later, the address is https://cosvoice.com/mcp and nothing else changes.
Ask Muse to confirm with you before any call goes out, and to say who it is ringing and why. The line itself holds the rest of the line: it says it is an assistant whenever anyone asks, it never reads out a card number, and it will not agree to spend your money. Nothing is charged for a call you did not ask for.
A number in your area code, its own email address, and a written account of every call.
Yes. Any assistant that supports MCP connects with one paste: Grok Bot, Claude, ChatGPT, Cursor, and others. Meta's Muse takes a different road, because it writes its own connector: you make an API key and Muse reads our published spec at cosvoice.com/openapi.json. The steps are at cosvoice.com/muse. Any of them can be woken by CosVoice if it has a webhook URL and a token. Developers also get a REST API and signed webhooks.
No. The line works on its own. Call it, text it, and ask it to make calls from your dashboard. If you do have a Grok Bot, or another assistant that supports MCP, connecting it lets your assistant make calls and read the summaries by itself.
On a call, no. It never gives out a card number or agrees to a charge, so a booking or appointment is the most it commits you to. Your plan's minutes are the only thing the line itself spends, and app orders (dinner, groceries) go through only after you confirm.
Good enough that callers treat it as a person. You pick from 38 voices in two sets, the new ones and the classic ones, and change any time in Settings. Every voice has a play button, and you can hear full calls on the demo page.
Pick a number, save the contact, make the first call. About a minute.