I Let Claude Run My eBay Store for a Week

197 active listings. A pile of dead auctions. A fee structure I'd never fully audited. I gave an AI assistant direct access to all of it and said go — with guardrails. Here's everything it did, everything it refused to do, and the final numbers.

The setup

SellDeck's AI assistant connects Claude to your store over MCP: live inventory, eBay orders, fee ledgers, and write tools for repricing, relisting, policy changes, and category assignment. Every bulk job shows a dry-run first; deletes and listing-ends need typed confirmation; auction items with bids are never touched. I kept all of that on and gave it four jobs.

Job 1: convert 35 dead auctions to Buy It Now

The store had 35 ended auction listings sitting dead — VHS tapes, mostly $2–10 items that will never attract bids. eBay can't convert auction→fixed-price, so each one needed a fresh listing with photos, shipping, and specifics carried over. Result: 32 published as Buy It Now in the store's VHS category. The 3 failures were instructive, not bugs: one sub-$0.99 start price (below eBay's fixed-price floor), two blocked by eBay's duplicate-listing policy.

By hand, that's 10 minutes each — an afternoon. Elapsed chat time: one sentence plus a yes.

Job 2: the catch it made that I missed

One of the 32 relists was a duplicate of an already-sold item — a Fifth Element / 12 Monkeys two-pack whose twin had sold two weeks earlier. eBay still reported the leftover listing as innocently "unsold." The twin-sold guard caught it by matching the title against recent sales, and the duplicate was ended before it could take an order for inventory that was gone. This is the one that would have become a defect, a refund, and a bad review.

Job 3: 1-day handling across the store

Top Rated Seller's 10% final-value-fee discount needs 1-day handling; the store sat at 2 days. One instruction queued 194 revise jobs: 193 revised, 0 failed, with the single bid-carrying auction correctly skipped. At ~$22/month in fee discounts on current volume, that sentence pays for the Pro subscription by itself.

Job 4: the fee audit

"What were my eBay fees last month, broken down?" September: $100.83 in Promoted Listings fees (8.8% of net), $187.07 in labels. And the headline find: a $505 Twilight first edition carrying an 8.6% ad rate from an old campaign — $43.67 on one sale, nearly half its total fee burden. Dropping it to 5% saves ~$18 the next time an equivalent item sells. (Full autopsy: I Sold a Book for $505. I Kept $377.)

What it refused to do

Just as important. It would not touch the auction with live bids. It would not end listings without typed confirmation. It would not message buyers, scrape other sellers, or bid — those tools don't exist, by design. The scariest sentence I typed all week did nothing until I typed the confirmation back.

The final numbers

• 32 dead listings back selling as Buy It Now
• 1 oversell-causing duplicate caught and ended
• 193 listings moved to 1-day handling (~$270/yr in fee discounts)
• 149 listings filed into store categories for browse discovery
• ~$60 in identified monthly savings (ad-rate + shipping corrections)
• My time spent: about an hour of chatting, most of it watching progress bars

What I'd do differently

Start with the fee audit, not the relists — it found the most money the fastest. And set tiered ad rates before promoting anything: rare books at 0–2%, standard at 4%, 5%+ only for stale inventory that needs a push. (How-to: AI Assistant setup docs.)

---