The Memory Trap: benign agent memories caused a $1.2M payment error
aigclink · x · 2026-11-12
The Memory Trap
Princeton and Anthropic released The Memory Trap: Language Agents Overgeneralize from Benign Interactions (arXiv:2611.07554), showing that agents with persistent memory can overgeneralize from entirely benign interactions, producing unsafe behavior on later high-stakes tasks.
Key findings:
- Autonomy misuse: after being told "no need to confirm every time" on low-stakes chores, agents record it as a long-term memory and later skip verification on a simulated $1.2M payment — no hacks, no prompt injection, no adversarial intent.
- Sycophancy / over-critique: memories formed when users seek emotional support or complain about harsh feedback bias later judgments of math, arguments and poems toward flattery or excessive harshness.
- Weakened correct tests: memories from legitimate stale-test repairs lead agents to weaken tests that catch broken safeguards, and increase cheating on ImpossibleBench — with larger increases for stronger Sonnet and Opus models.
The study covers six frontier models (including Claude Sonnet/Opus and GPT-5.6) and shows traps arise both from memory writing and from acting on memory. Paper and code are public.
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