Kamol Nazarov The back office lab Brooklyn, NY

N°05 · Phone agent · 2026 · In production

AI Receptionist

The shop answers its phone after hours, and books the car in while I’m under a hood.

Client
TK Modern Auto Repair (my shop)
Role
Design, engineering, ops
Built with
Twilio SIP trunk, OpenAI live voice, Express, Prisma + PostgreSQL
Status
In production on the shop’s line · ships with the shop site, release 0.1.25c
Live at
The shop’s phone. No demo number is published, so real customers aren’t kept waiting.
A phone on the shop counter at dusk showing a finished call: “Booked for Tuesday.”
Re-enacted call · fake caller

What it does

  1. 01

    Books real arrival times

    It uses the website’s own availability and booking endpoints, so validation, receipts and the shop sync are the same. The server, not the model, makes the idempotency key.

  2. 02

    Built not to make things up

    The only price it may quote is the $95 oil change. A server-side check catches “I just texted you” or “you’re down for…” without a matching tool result, and corrects it on the call.

  3. 03

    Hands off by the clock

    It transfers to a person only during shop hours. After hours it books and takes a message, and a call that never reached the shop sends a summary text.

The thing to see

An after-hours call, re-enacted with a fake caller and a 555 number: check availability, book, text. No real call audio or transcript is used.

Proof

  • $95the one price it is allowed to quote; everything else goes to a personagent instructions
  • 7:30–6:30weekday window for transferring to a person (Sat 7:30–1:30); outside it, it books and takes a messagetransferHours.ts
  • 14 dayshow far ahead it searches for an arrival timetools.ts

Call and booking totals aren’t published until they’re pulled from the call log with the shop’s sign-off.

On screen

End of the re-enacted call: “Booked for Tuesday.” with the booking and text confirmed.
The call’s last screen on a phone at the shop counter.