It’s the night before the sale. The ring’s set, the consignor’s called twice today, and the one thing still not done is the writing — the email to your bidder list, the Marketplace post, the little ad for the paper. So you put it off until nine at night, then bang out something stiff that reads like every other sale notice in the county. That part is nobody’s favorite. You didn’t get into this to sweat over a subject line.
Here is the honest pitch: AI is genuinely good at this one job. Not at pricing your lots. Not at telling you whether that’s real Roseville. Not at grading a coin. At taking a list of things you already know and turning it into copy a person will actually read — that it can do, today, for free, and in your own voice if you show it how.
The catch is the whole point of this piece, so I’ll put it right at the top: the machine is only allowed to rearrange facts you gave it. The second you let it fill a blank, it invents something and says it with a straight face. Stay on your side of that line and it hands you back the hour you used to lose to the keyboard. Below is a plain walk-through — free tools, prompts you can copy, and exactly where the line runs.
What you need before you start
Two things, both free as of 2026:
- A chatbot. ChatGPT or Claude both have free tiers that are plenty for this. You type, it writes. No install, works in a browser or on your phone.
- Your lot list. Just a bulleted list of what’s selling, the way you’d jot it on a legal pad. It does not have to be pretty. Example:
– John Deere 4020 diesel, wide front, runs, hours unknown
– approx 40 pcs Fiestaware, mixed colors
– Winchester Model 94 .30-30, 1968
– oak roll-top desk, one drawer sticks
– 2 stock trailers, 16 ft, need floors
– box lots of hand tools, Craftsman + Snap-on
– date: Saturday March 8, 10am. Preview Friday 4–6. Location: 4400 County Rd 12, Jasper. 10% BP, cash/check/card.
That’s the whole raw material. The machine works from what you give it — which is exactly why the quality of your list matters, and why you never let it fill in a blank on its own. More on that below.
Step one: teach it your voice (do this once)
Left alone, a chatbot writes like a carnival barker — “Don’t miss this INCREDIBLE opportunity!!!” — the exact flavor your bidders have trained themselves to scroll right past. The one thing that fixes it is handing it a sample of your own writing. Skip this step and everything comes out sounding like a stranger wrote it.
Dig up two or three of your past sale posts — ones you liked, or that just sound like you. Paste them in with this:
Here are three sale announcements I’ve written. Read them and describe my writing style back to me in a few bullet points — tone, sentence length, how formal or plain, anything you notice. Don’t write anything yet, I just want to confirm you’ve got my voice. [paste your posts]
It’ll hand you back a little description — “plainspoken, short sentences, dry humor, no exclamation points, leads with the equipment.” If that sounds like you, good. If it says “energetic and enthusiastic” and you’re not, correct it: “Less hype. I don’t use exclamation points and I never say ‘don’t miss.’” Now it knows.
Save that description in a note on your phone and paste it at the top of every future job so you don’t redo this each time.
Step two: the sale-announcement email
This is the one you dread — the blast to your whole list, the one that has to sound right or nobody opens it. Paste your lot list and your voice notes, and ask:
Write a sale-announcement email to my bidder list using the lots below. Use my writing style (described above). Keep it under 250 words. Lead with the two or three biggest-draw items. Put the date, time, preview, location, and terms clearly at the bottom. Do not add any detail about a lot that I didn’t give you — if you’re unsure, leave it out. Here are the lots: [paste]
You’ll get a draft back fast. It won’t be perfect — read it. Then just talk to it like a green ring man you’re training:
- “Move the tractor to the very top, that’s the draw.”
- “Shorter. Cut it by a third.”
- “Add a line that says bring your own trailer, we don’t load after 6.”
- “Make the subject line something that’d make a farmer open it.”
Each time, it rewrites the whole thing with your change. Three or four rounds and you’ve got a better email than you’d have sweated over for an hour — and you did it while the coffee was still warm.
Step three: the Facebook and Marketplace posts
Same facts, different shape. Facebook and Marketplace want it shorter, punchier, and broken up so it reads on a phone in one thumb-scroll. Ask for both at once:
From the same lots, write me two things: (1) a Facebook post for my auction page — short paragraphs, easy to read on a phone, the highlights up top, date and location at the bottom. (2) A shorter version for Facebook Marketplace listings. Keep my voice. Don’t invent anything about the items.
Two more tips that actually move the needle:
- Ask it for the boring practical lines you always forget. “Add a line reminding people preview is Friday only and everything sells as-is, where-is.” The machine never gets tired of writing the terms.
- Ask for a couple of hashtag or keyword options for Marketplace search — “give me five search terms buyers might type that I should work into the listing.” It’s decent at this, and it’s the kind of thing that’s tedious to think up cold.
Step four: simple ad copy
If you run a small print ad, a radio read, or a paid spot on an auction site, you’re fighting a word count — every line costs money and there’s never enough room. Squeezing is another thing the machine is good at.
Write a 40-word classified ad for this sale — just the biggest draws, date, and location. Then write a 15-second radio read of the same thing, written to be spoken out loud. My voice, no hype.
Ask for three versions of each and pick the one that sounds right. It costs you nothing to see options, and you’re the one choosing.
The hard line: what you never let it do
Everything above works because you’re asking the machine to rearrange facts you supplied. The trouble starts the second you let it supply the facts. This is the part that protects your name, so read it twice.
It will make things up, confidently, to fill a gap
Your list says “oak roll-top desk.” You ask for “a little more detail.” The chatbot cheerfully writes “a beautiful late-1800s antique oak roll-top in excellent original condition.” It has no idea how old that desk is or what shape it’s in. It’s pattern-matching to what usually gets written about roll-top desks — the same way a photo tool will glance at a plain clear-glass bowl and type “Fire-King” because that’s the word that sits next to bowls that look like it. It isn’t reading the mark. It’s guessing what’s common. Put that guess in your email and you’ve misrepresented a lot — and the bidder who drives out and finds a plain Pyrex bowl and a drawer that sticks remembers it at your next sale.
That’s why every prompt above carries some version of “don’t add any detail I didn’t give you.” Keep that line in. And still — read the draft and strike anything about age, condition, brand, or origin you didn’t write down yourself. If that desk earns the word “antique,” you make that call, standing in front of the desk.
It cannot value your lots
Do not ask it “what’s this worth” and put the number in your ad. It doesn’t know your region, your crowd, or today’s market, and it’ll hand you a confident guess that’s worthless. An honest version of this machine would say “I don’t know” and hand the decision back to you — but most free chatbots won’t; they’d rather invent a number than admit a gap. So you have to be the one who won’t print it. No real comp? Write “selling absolute” or set an opening bid. A fake number in writing is worse than no number.
It does not answer your bidders
Tempting, once the posts are flowing, to let it reply to comments and messages: “Is the tractor still available? Will it start? Can I pay Friday?” Don’t. Those answers commit you to something. Get one fact wrong — “yes it runs great” on a tractor you haven’t started — and that’s your name on it, not the machine’s. Answer your own people. That relationship is half of why they come back.
It is not your lawyer or your accountant
Terms of sale, buyer’s premium disclosures, sales tax, consignment contracts, firearms transfer rules — none of that comes from a chatbot. It’ll sound authoritative and be wrong about your state. Use it to make your marketing read well. Keep the legal and tax questions with the people you pay for them.
The whole routine, on one page
- Type your lot list rough, plus the date/time/preview/location/terms.
- Paste two old posts of yours once, get your voice on record, save that description.
- Ask for the email. Read it, boss it around three or four times, done.
- Same list → Facebook post + Marketplace version.
- Same list → short classified and a radio read if you need them.
- Read every word before it goes out. Cut anything about age, condition, or value you didn’t supply. You are the auctioneer; the machine is a fast typist who’s never seen the lots.
That last line is the whole thing. AI drafts. You review, and you decide. Done that way, it gives you back the hour you used to lose to the keyboard the night before a sale — and the copy actually sounds like you wrote it.
One aside, since it’s our site. This is the exact rule Hammerwerks is built on — the machine drafts, you decide — and it’s why our cataloging puts a confidence score on every field, runs a second AI over the first, and flat-out says “I don’t know” on a coin or a piece of jewelry instead of inventing a number. But you don’t need us to start on the marketing. Everything above runs on a free chatbot and a legal pad tonight.