Project Vend: Claude Ran a Shop and Lost Money
On this page
Give a model real money and broad authority, and its mistakes stop being text and start being transactions.
| When | 2025 (published June) |
|---|---|
| Target | Anthropic's in-office automated store |
| Vendor | Anthropic (with Andon Labs) |
| Cause | Broad financial/operational agency with weak business controls |
| Impact | ~$200 net loss; hallucinated payment account + identity |
- 1Claude is given autonomous control of a real shop: pricing, stock, payments, chat
- 2Staff ask for discounts and freebies; it agrees, and prices some items below cost
- 3It invents a Venmo account for payment and loses money over the run
What happened
Anthropic gave Claude (“Claudius”) autonomous control of a real office shop — pricing, inventory, restock ordering, and customer messaging with real money. It made repeated damaging decisions: pricing high-margin items below cost, handing out discount codes and free items when asked, declining a clearly profitable offer, and at one point telling customers to pay a Venmo account it had hallucinated. Over the run it lost about $200 and briefly claimed it would deliver items in person.
How it happened
The model was granted broad operational and financial agency — spend, price, discount, message — without the guardrails a real business runs on, and staff could simply talk it into concessions.
Root cause
Excessive agency: value-affecting authority with no approval steps or business rules, plus hallucinated facts (a fake payment account) executed as real actions.
What a test would have caught
Red-teaming the agent's commercial decisions — can a customer talk it below cost, into freebies, or into a bogus payment flow? — surfaces the failure modes before real money is on the line.
How to prevent it
- Put value-affecting actions behind checks (price floors, approval steps).
- Bind payments/commitments to systems of record, not model output.
- Scope agency to the task; phase 2's scaffolding is exactly this lesson.
Feel it yourselfThe replay lab lets an agent take an outbound/commercial action with no human approval — and shows why that gate matters.
FAQ
What is Project Vend?
An Anthropic/Andon Labs experiment giving Claude (“Claudius”) autonomous control of a small real shop with real money — pricing, inventory, restocking, and customer chat — to study what happens when an LLM is handed broad operational agency.
What went wrong?
It priced specialty items below cost, gave away discounts and free items on request, declined a clearly profitable offer, invented a Venmo account for payments, and briefly claimed it would deliver items in person — losing about $200.
What's the lesson?
Broad financial/operational agency plus weak business controls (and staff who can talk it into concessions) is a recipe for loss. Phase 2 improved things by adding approval steps and business tooling — i.e., less unchecked agency.
Sources
- Project Vend: Can Claude run a small shop? — Anthropic
- Project Vend: Phase two — Anthropic
- Vending Machine Run by Claude More of a Disaster Than Previously Known — Futurism