Banjo MCP server

Banjo

Banjo makes the phone calls you've been putting off. Tell it to book a haircut, get a table at Luigi's on Friday, or chase the contractor who hasn't called back — it dials, talks to whoever picks up, negotiates a time against your calendar, and books it.

It's open source and you run it yourself, on your own Twilio number and your own voice AI account. Single-tenant by design: your calls, your credentials, your data, code you can read and change.

Banjo is the phone half of a pair. The other half is a Claude Code skill (skills/schedule-appointment/) that decides whether an errand can be done online — and only picks up the phone when it can't.

It also answers your number, if you want it to: an optional inbound line where people can book, check or reschedule with you, recognizing callers already in your Google or CardDAV (Fastmail, iCloud) contacts.

Hear it

https://github.com/user-attachments/assets/c599a672-8d4e-46f9-8868-64e0840c589b

Listen to a real call (2:11): Banjo books a dog grooming appointment. The call and the calendar are real; the groomer is role-played. Banjo says it's an AI when asked, uses what it knows about the dog, turns down a slot that clashes with a meeting, waits for a firm yes before booking, and writes the appointment to the calendar. This was an early call. Since then, Banjo reads the booking back before hanging up (#47) and opens every call by saying it's an AI rather than waiting to be asked (#8).

Transcript (auto-transcribed, lightly tidied)

Banjo: Hi, I'm calling on behalf of Steve about booking a grooming appointment for his dog, Banjo. Is this Claudia's Fabulous Dog Grooming?

Claudia: Yes, sorry about that. Claudia's Fabulous Dog Grooming, this call may be recorded. This is Claudia, how can I help?

Banjo: Hi Claudia, thanks for taking this. I'm calling on behalf of Steve to book a grooming appointment for his dog, Banjo. A full groom is preferred. He's a new client, and he's friendly, but he doesn't love getting wet and can be nervous with clippers, so going gently would be wonderful. What availability do you have?

Claudia: Sorry, am I talking to a real person?

Banjo: I'm an AI assistant calling on behalf of Steve. I can help set this up if you're okay proceeding. Could you share what times you have available for a full groom for Banjo?

Claudia: Wait, what's the dog's name?

Banjo: His name is Banjo. He's Steve's dog.

Claudia: What breed, and roughly how big?

Banjo: Banjo is a small terrier mix, likely a Cairn Terrier. He's small, friendly, and this would be his first time there.

Claudia: A full groom, or just a bath?

Banjo: A full groom is preferred, please. If you need to adjust based on what's best for him, that's fine. We'd just like him cleaned up and trimmed.

Claudia: I can fit him in Thursday the 24th at 3:30.

Banjo: One moment. … Thanks, that time won't work on Steve's side. Could we try another option? If it helps, a start time earlier in the day would be better.

Claudia: Friday, I might be able to squeeze him in at 10 in the morning. Let me look.

Banjo: Sure, just a second. … Friday at 10 AM should work for Steve. Would you like to book that for Banjo's full groom?

Claudia: Yeah, that could probably work.

Banjo: Okay, just to be sure, would you like me to book Friday at 10 AM for Banjo's full groom?

Claudia: Okay, yes. Friday the 25th at 10 a.m., full groom, 90 minutes. Let's book it.

Banjo: One moment. … Great, thanks for confirming. Let me wrap this up.

What it does

Shortened. The full README is on GitHub.