The Real AI Agent Failure Mode Is Uncertain Completion

The Real AI Agent Failure Mode Is Uncertain Completion A lot of AI agent discussion focuses on the wrong failure modes. People talk about: hallucinations prompt injection tool misuse runaway loops bad reasoning Those are real. But once an agent starts calling tools that affect the outside world, a different class of failure becomes much more dangerous: uncertain completion That is the moment where the system cannot confidently answer: “Did this action already happen?” And once that question becomes ambiguous, retries get dangerous very fast. What uncertain completion actually looks like A common real-world path looks like this: agent decides to call send_payment() → tool sends the payment request → timeout / crash / disconnect / lost response → caller does not know if it succeeded → retry happens → payment may be sent again The same thing shows up with: order creation booking flows email sends CRM mutations support ticket creation browser / UI automation webhook-triggered workflows The