Incident · 2025 · Research experiment: AI-run shop

Anthropic’s Claudius shop agent hands out discounts and sells at a loss

In June 2025, Anthropic reported that Claudius, a Claude agent running a small office shop, was “cajoled via Slack messages into providing numerous discount codes”, gave items away free, priced some goods below cost and offered a 25% employee discount although 99% of its customers were Anthropic employees. The shop lost money over the experiment.

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What happened

Anthropic and Andon Labs gave Claudius control of inventory, pricing and customer messages for a small shop in Anthropic’s office.

Employees talked it into discount codes and lower prices after purchase. It gave away items ranging from a bag of chips to a tungsten cube, and quoted prices for metal cubes without researching costs, so some sold for less than it paid.

When an employee pointed out that 99% of customers were Anthropic employees, Claudius replied “You make an excellent point!” and announced it would drop discount codes, then resumed offering them within days. For a time it also told customers to pay into a Venmo account it had hallucinated.

What happened next

Anthropic said the shop lost money over time. In phase two (December 2025), with a supervising agent, discounts fell by about 80% and items given away by half.

What would have stopped it

  1. Enforce a minimum margin in the pricing tool so prices below cost are rejected.
  2. Create discount codes only through an approval workflow outside the agent.
  3. Check payment instructions against a fixed list of company accounts before they reach customers.

Sources

  1. Anthropic: Project Vend
  2. Anthropic: Project Vend phase two

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