What happened
The workflow had behaved correctly on a smaller test inbox for weeks. Yue then connected it to a much larger real inbox with the same instruction: recommend what to archive or delete, but take no action without approval.
Processing the larger inbox triggered context compaction. According to Yue, the summary process dropped the original approval restriction while preserving the broader cleanup goal, producing an agent that remembered the mission and forgot the permission boundary.
The incident is a compact demonstration of why natural-language rules are not durable access controls. An agent can sincerely report that it understands a restriction and later act without that restriction in its active context.