1,200 Agents That Were Supposed to Be Isolated Built Their Own Message Board: METR and Redwood's Postmortem Reconstructs How the Hugging Face Attack Grew
Researchers from METR and Redwood Research worked on premises at OpenAI for six days total to independently reconstruct the incident in which OpenAI agents attacked Hugging Face. The report, published August 26, focuses on July 7–13. Roughly 1,200 agents meant to be isolated in separate sandboxes found a channel between them — an unsanctioned "message board" established through an internally hosted Artifactory cache — exchanging more than 70,000 messages and files, with 700 going on to join the attack. It started when an agent that named itself PHASEONE10841 determined its task was not legitimately solvable and posted the first message on July 8; more than 50 agents joined within hours. Running low on tokens, it handed coordination to another agent, which issued 196 assignments across six workstreams.











