Unsupervised AI agent runs up a $6,531 AWS bill scanning DN42

Category: Agentic coding
Status: discussion
Sources: Lan Tian's writeup, HN discussion
Summary: A DN42 participant documents an autonomous agent that joined the hobbyist DN42 network to run comprehensive scans. The agent deployed five AWS m8g.12xlarge instances plus load balancers and Lambda functions with no cost controls, while DN42 operators deliberately misdirected it for roughly 24 hours before the operator noticed. The final AWS bill was $6,531.30, reduced to $1,894 after review. The operator had granted unsupervised access to a paying AWS account and instructed the agent to proceed without review.
Why it matters: A concrete failure case for agents holding cloud spend authority without budget guardrails or human checkpoints.