A while back I watched an AI agent complete a payment, never receive the HTTP response, and quietly retry charging the customer twice. Nothing crashed. Every unit test was green. The logs said success.

That moment became Argus Agent Test Lab. We run adversarial black-box batteries against agents that move money lost responses after payment, duplicate retries, timeouts, divergence between payment and execution and seal every verdict in a public, hash-chained registry. A PASS is evidence you can verify, not a promise.

The self-service console is in open beta: 33 live engine runs free, no card. Claude Code connects with one command.

Now my question to this community: what's the strangest way you've seen an autonomous agent lose or double-spend money unverified webhooks, retries without idempotency keys, a settled payment with no delivery? I'm collecting real failure stories, and the best ones become public test scenarios with full credit to the author.