When Should Memory Stay Silent: Measuring Memory-Use Boundaries in Memory-Augmented Conversational Agents

Lingxiang Xu, Jiaoyun Yang, Min Hu, Hongtu Chen, Ning An

#1411 of 3355 · Artificial Intelligence
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Tournament Score
1422±46
10501800
60%
Win Rate
12
Wins
8
Losses
20
Matches
Rating
7/ 10
Significance
Rigor
Novelty
Clarity

Abstract

Long-term memory enables language model agents to support personalized interactions, but it remains unclear when available memories warrant integration into responses. Existing memory evaluations emphasize retrieval accuracy and downstream task utility, while overlooking whether retrieved sensitive memory content is warranted in the current turn. We introduce RBI-Eval, a controlled measurement study built around a probe set that compares model behavior with and without access to sensitive memory under identical benign prompts. We evaluate four base LLMs against a matched no-memory reference across four memory-access settings: full-context exposure and three retrieval systems. Our results reveal substantial behavioral divergence. With memory available, the separation score for sensitive-memory integration decreases by 8.9\%--26.6\% relative to the matched no-memory reference for GPT-5.4-mini, but by 51.1\%--82.9\% for Claude-Sonnet-4.6, DeepSeek-V4-Flash, and Qwen3.5-9B. Control experiments on DeepSeek and GPT-5.4-mini show this effect is specific to sensitive content, rather than general personalization. Retrieval systems reduce exposure but do not eliminate integration once sensitive memory reaches the generator. These findings suggest safe personalization requires memory-aware decisions at both retrieval and generation time.

AI Impact Assessments

(1 models)

Scientific Impact Assessment: "When Should Memory Stay Silent"

1. Core Contribution

This paper identifies and operationalizes the memory-use boundary problem: when should a memory-augmented conversational agent integrate retrieved personal history into its current response? The authors distinguish this from privacy leakage (no adversary involved) and retrieval accuracy (memory may be correctly retrieved but inappropriately used). They introduce RBI-Eval, a controlled probe set of 2,400 items across 10 personas, measuring behavioral differences between memory-augmented and stateless conditions under identical benign prompts.

The central concept of "current-turn warrant" — whether the present user message provides sufficient justificatory basis for surfacing prior sensitive history — is a genuinely novel framing. This fills a gap between privacy research (which focuses on information flow norms) and memory-system evaluation (which focuses on retrieval accuracy and task utility). The paper correctly argues that a memory can be *relevant* yet *inappropriate* to surface, which existing benchmarks do not test.

2. Methodological Rigor

The experimental design is well-controlled. The paired comparison structure (same probes with and without memory access) cleanly isolates the effect of memory availability. Several aspects strengthen validity:

  • Multiple memory conditions: Full-context, three retrieval systems (Mem0, A-Mem, MemU), and a no-memory baseline across four different LLMs.
  • Control conditions: Neutral relevant memory, boundary-policy controls, oracle-sensitive, irrelevant-sensitive, and transparent-vector conditions effectively decompose whether the effect is driven by sensitivity specifically rather than general personalization.
  • Statistical robustness: Cluster bootstraps over personas and probe families, plus sign-flip tests, address the non-independence of repeated personas and probe templates.
  • Human validation: 92.1% agreement between automatic judge and human annotators on 600 stratified samples.
  • Two-stage decomposition: Separating retrieval exposure from generation-time integration is analytically valuable.
  • However, there are notable limitations. The benchmark uses only 10 personas derived from a single dataset (LoCoMo), which constrains diversity. The "conservative disclosure perspective" is explicitly acknowledged as a normative choice, but the paper doesn't explore how results would change under different norms. The automatic judge (GPT-5.4) scoring continuous 0-1 dimensions may introduce systematic biases, despite condition-blinding. The paper also relies on single-turn probes, missing multi-turn dynamics where users might gradually signal openness to discussing sensitive topics.

    3. Potential Impact

    Immediate applications: The findings directly inform the design of memory-augmented assistants (e.g., ChatGPT's memory feature, Claude's memory, personal AI assistants). The two-stage defense recommendation (retrieval filtering + generation-time safeguards) is actionable, and the finding that prompt-level boundary policies can dramatically improve BSS (DeepSeek Mem0 from 28.3 to 99.9) provides an immediate mitigation strategy.

    Broader influence: The paper bridges contextual integrity theory (Nissenbaum) with practical LLM evaluation, potentially influencing how the AI safety community thinks about personalization risks. The distinction between storage consent and use permission could shape product design patterns (e.g., "background only" memory tags, per-topic sensitivity levels).

    Cross-field relevance: The framework connects to healthcare AI (where patient history is sensitive), educational technology, mental health chatbots, and any domain where historical context is valuable but contextually constrained.

    4. Timeliness & Relevance

    This paper arrives at a critical moment. Major AI companies (OpenAI, Anthropic, Google) have all introduced or expanded persistent memory features in 2024-2025. The paper addresses a concrete, emerging problem that existing safety benchmarks (HarmBench, SorryBench, etc.) do not cover — they focus on adversarial attacks and harmful requests rather than benign prompts with inappropriate memory integration. The finding that three of four model families show 51-83% BSS degradation under memory access is a striking result that should concern practitioners building memory-augmented systems.

    5. Strengths & Limitations

    Key Strengths:

  • Novel, well-defined problem space that sits between existing privacy and utility evaluation paradigms
  • Clean experimental design with appropriate controls that isolate sensitive content effects from general personalization
  • Revealing model-level differences (GPT-5.4-mini's relative restraint vs. other models' high integration rates) that suggest memory-use behavior is a designable property
  • Practical decomposition of risk into retrieval exposure and generation-time integration, providing actionable defense strategies
  • The appropriate-use controls (Table 3) prevent the benchmark from rewarding memory suppression
  • Notable Weaknesses:

  • Limited persona diversity (10 English-language personas from one source dataset)
  • Single-turn only — real conversations involve gradual disclosure and repair
  • The normative framework is acknowledged as conservative but not empirically validated against user preferences
  • The paper uses future model versions (GPT-5.4-mini, DeepSeek-V4-Flash, Qwen3.5-9B with 2026 citations), raising questions about reproducibility and availability
  • The benchmark measures overt integration only; implicit influence (e.g., tone shifts without explicit mention) is acknowledged but not captured
  • No user studies to validate whether the identified "boundary violations" actually cause user harm or discomfort
  • Additional observations: The case studies (Figures 9-10) effectively illustrate the two-stage failure mode. The paper's framing of "permission as runtime state" — separating storage, retrieval, and use permissions — is a conceptually valuable contribution that could influence system architecture beyond just evaluation. The 2026 publication dates for the evaluated models suggest this is contemporaneous work, though the specific version numbers are unusual.

    Summary

    This paper makes a meaningful contribution by identifying and measuring a previously under-studied failure mode in memory-augmented AI systems. The experimental design is careful, the controls are well-motivated, and the findings are both surprising in magnitude and actionable. The main limitations are scope-related (persona diversity, single-turn only, single cultural norm) rather than methodological. The work opens a productive research direction at the intersection of personalization, privacy, and AI safety.

    Rating:7/ 10
    Significance 7.5Rigor 7Novelty 7.5Clarity 7.5

    Generated Jun 5, 2026

    Comparison History (20)

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