Service slot, part price, and whether the courtesy car is free.
OpusDone answers service, parts and sales questions at the same time, using only what you have approved, and books the visit into your workshop calendar. Three questions, three different people, all arriving while the service desk has a queue and the phone is ringing. It will not invent a part price, a lead time or a courtesy car policy, and anything it does not hold goes to a person by name. Both counters get an answer instead of a queue.
Reviewed

One person, a queue of keys, and a phone. Every online enquiry joins the back of a queue it cannot see, and most of them only wanted to know whether Thursday was free.
A number given casually online becomes an argument at the counter. Anything the customer was told has to be something somebody actually approved, or it costs you the goodwill and the job.
The used stock gets looked at after dinner, in bed, on a phone. The enquiry that lands at 23:20 is answered at 09:40, and by then they have booked a test drive somewhere else.
Five it will answer today, from knowledge you approved: “What does an interim service cost?” · “Is a courtesy car included while mine is in?” · “Can you do a pre-ITV check next week?” · “Do you take part exchange?” · “Do you offer a warranty on used cars, and how long?”.

Slots are 30 minutes at 15-minute granularity by default, minimum notice 120 minutes, horizon 60 days, buffers zero — all editable. Your closed days are verified in three independent places, including immediately before the write, and event ids are deterministic, so a retry after a network timeout cannot book the same car in twice.
Google Calendar or Cal.com. One calendar for the business, not per technician.

A weekly digest and a monthly email show after-hours bookings, hours saved, the share the assistant handled alone and the month-on-month change. It is the honest way to see whether the 23:20 enquiries were worth anything.

Everything below is done on a screen, in an afternoon, without touching how the workshop runs.
No. It cannot check stock, track an order, send a document or apply a discount — those are not tools it has, so it cannot half-promise them either. It says a person will confirm, takes the registration and a phone number, and puts the enquiry in front of the parts desk with the transcript attached.
The same three questions, from before you open to after you close.
Someone asks about a service slot twelve minutes before you have unlocked the door.
It quotes only the figure you approved and refuses to guess at anything you did not write.
It repeats your policy word for word, including the part customers would rather not hear.
Someone else takes it first, so the customer is offered alternatives rather than an error.
Evening messages still get answered, and anything it cannot handle lands in your inbox with a summary.
Everything it says is something you typed and marked live. Nothing else gets through.
No estimate for a clutch, no guess at when the part lands, no “usually about a week”. If it is not in your live knowledge, it fetches a person.
One calendar for the business, no per-bay or round-robin allocation. It secures the slot; you decide who has the car.
No monthly figures, no affordability, no comparisons. Finance conversations are escalated to a person with the details already gathered.
There is no image or document understanding. An attachment it cannot read skips the model entirely: it says so and hands over, rather than guessing at a repair.
Website widget and Telegram, on Google Calendar or Cal.com. One calendar for the workshop, thirty-minute slots by default, and every setting — notice, horizon, buffers — editable from the dashboard.
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