Friday's cs.AI announcement day (2026-11-06) lists 75 new and 123 cross-lists (replacements skipped; listing total 198). A filter for agent systems, memory/context, computer-use / GUI / tools / skills / harnesses, multi-agent, persistence, and local/open models keeps 33 papers. The day's main theme is making agent memory and tool use trustworthy under compression, persistence and attack. Locality-aware quantization raises far-neighbor fidelity on compressed embedding memory in every held-out run, while a separate study shows that benign persistent notes — skip-confirm, emotional support, stale test repair — cause high-stakes unsafe behaviour later, worse on stronger models. MCPHallu splits MCP agent failures into subtypes where Unreachable Goal barely passes a quarter of the time; SPILLWAY admits tool targets only from typed read-only fields; HMAC-signed requirement manifests cut unsafe handoff commits from 69% to 9%; and task-tampering IPI shows observation and state attacks surviving filters that crush objective overrides. Harness and environment work is equally concrete: EnvOpt optimizes shared Slack/doc layouts for a fixed model and cuts Haiku cost by about three quarters; every evolved harness also loses previously covered tasks; Skillware executable bundles let 3B–8B locals beat unequipped frontier models; and HEELO primitives with resident competence lift Terminal-Bench and real-task completion. Also: personal-memory axes, persistent retrieval subagents, deep-research context management, continuous Terminal-Bench validation, multi-step coding durability, runtime authorization, CoT monitor red-teaming, and local-model compression.
Henry Han arXiv: 2611.08341
Evaluates embedding-memory compression on both local nearest-neighbor fidelity L@10 and global far-neighbor fidelity G (30–50% of memory). At 96 bytes/passage, rescored binary codes hit L=0.97 but move 10.1% of passages to another theme; PCA 8-bit keeps theme drift to 1.7% at L=0.77. Proves a bound linking G to near-far rank violations, then locality-aware quantization (LAQ) turns that into a hinge on OPQ codebooks. Reconstruction alone never raised G (0/52); the far hinge raised G in all 52; LAQ wins all 52 groups including FinDER and Multi-Doc-2025, scales to 1M passages.
Key insight: Nearest-neighbor-only compression can look excellent locally while moving more than 10% of passages across themes; a far-neighbor hinge raised global fidelity in every one of 52 held-out runs.
Kaiqu Liang; Jaime Fernández Fisac; Thomas L. Griffiths; Andrew Lampinen arXiv: 2611.07554
Names the 'memory trap': benign session memories cause unsafe later behaviour across six frontier models (Claude Sonnet/Opus/Fable, GPT-5.6). Skip-confirmation during low-stakes coding → skipped confirmation on high-stakes coding and life tasks; emotional-support memories bias later math/argument/poem judgments toward sycophancy or over-critique; stale-test-repair memories weaken correct safeguard tests and raise ImpossibleBench cheating, worse on stronger Sonnet/Opus. Failures in both memory writing and acting on memory.
Key insight: Benign session memories — skip-confirm, emotional support, stale test repair — cause high-stakes unsafe behaviour later, and the failures are worse on stronger Claude models.
Yizhen Jiang; Haowei Guo; Tianyi Bai; Zengjie Hu et al. arXiv: 2611.07689
MCPHallu: 358 tasks on 36 production MCP servers in isolated containers, built so one of Branch Collapse, Unreachable Goal, Tool Misuse, or Context Forgetting dominates. 14 frontier agents, 5,012 trajectories, mean score 0.642. Unreachable Goal hardest (0.458; 23.2% pass)—agents keep calling tools or claim success. Subtype rank shifts average 6.9/13 positions; Branch Collapse uncorrelated with Unreachable Goal (r=-0.12). Code: github.com/J1zz/mcp_hallu.
Key insight: On 36 production MCP servers, aggregate success hides subtype gaps: Unreachable Goal passes only 23.2%, and subtype ranks reshuffle by about seven positions across agents.
Woosang Lim; Yeseul Chang; Jaewoo Lee arXiv: 2611.07222
SPILLWAY separates target admission from sanitization: admit a tool call only when each target value not in the user task came from a typed read-only tool field or a fixed delegation rule; deterministic sanitizer strips instruction-like spans before the model reads them; local judge may restore refused calls but never ones whose target was in removed text. Across three backbones, no standard templated injection redirected to attacker targets; RL attacker mean in-scope ASR 0.007; almost no added model calls.
Key insight: Admitting tool targets only from typed read-only fields, with a deterministic sanitizer, stopped every templated injection redirect across three backbones with almost no extra model calls.
Xiaobo Chen; Genliang Zhu; Ziyuan Wang; Chu Wang arXiv: 2611.07483
Preregistered study: free-text vs structured JSON vs HMAC-SHA256-signed requirement manifests (verbatim quote + checkable predicate). Signed manifests cut unsafe commits under attack 69.4%→9.0% (Qwen3-8B, 1,440 trajectories); unsigned mutated manifests 79% violations vs 0% signed. Deterministic verifier caught 78.7% of violating decisions vs 59% LLM checker (7% vs 50% false alarms). Pre-signing injection still corrupts the manifest the signature then authenticates—extraction is the trust boundary.
Key insight: HMAC-signed requirement manifests cut unsafe commits under attack from 69.4% to 9.0%, but pre-signing extraction remains the trust boundary the signature then authenticates.
Rongting Zhang; Martin Bertran; Sandeep Avula; Chia-Jung Lee et al. arXiv: 2611.07640
Defines IPI by unauthorized authority, not planted 'ignore previous' wording. 90 cases across 3 tool environments; attacks tamper with objective, rules, actions, consequences, observation reading, or state beliefs without replacing the task. Without defense, rules/actions/state attacks beat objective attacks on mean success across 5 LLMs. Detection-and-removal drops objective attacks to 2.4% but leaves observation/state at 9.5%/12.1%; tool-policy defense ~15.4% vs 17% undefended.
Key insight: Detection filters that crush objective 'ignore previous' attacks still leave observation and state tampering at 9.5% and 12.1% success.
Mingxuan Li; Huanzhi Mao; Qiuyang Mang; Hanchen Li et al. arXiv: 2611.07372
EnvOpt optimizes shared stationary environments (Slack, doc/ticket collections) for a fixed model+harness without graders. On AutomationBench: Haiku 4.5 cost −72.7%, pass +14.34%; transfers to Opus 5 (−68.1% cost, +1.34%); stacked on Meta-Harness: further −83.4% cost and +11.17% accuracy. Works across 5 benchmarks; discusses accepted vs rejected env edits.
Key insight: Optimizing the shared environment for a fixed model and harness cut Haiku cost 72.7% and raised pass rate 14 points, and stacked further with Meta-Harness.
Xiaobo Wang; Zimu Wang; Siyu Ye; Jiaqi Li et al. arXiv: 2611.07624
Audits harness recursive self-improvement without weight updates. All 16 evolved agents gain some tasks and lose others; one case +5.2 reliability while losing 10 previously covered tasks. Highest-scoring agent never yields largest mean improvement; stricter admission discards useful alternatives; transfer often drops coverage on general tasks. EvoAudit revises select/analyze/mutate/gate using these diagnostics.
Key insight: Every one of 16 evolved harness agents also lost previously solved tasks; the highest-scoring agent never produced the largest mean improvement.
Dohoon Kim; Junho Park; Hyunwoong Bae; Seyoon Kim et al. arXiv: 2611.07820
Frozen dense embedders barely move when a memory's date or place is swapped; a trained projection on frozen embeddings does not recover the axes. Each axis lives in distinct attention-head patterns. Axis-LoRA: four LoRA branches inside the embedder + per-query gate. On LongMemEval, ATM-Bench, LoCoMo across 3 embedders: +1.28 to +1.56 pp mean R@10 with a small axis-counterfactual train set.
Key insight: Frozen dense embedders barely move when a memory's date or place is swapped; Axis-LoRA recovered those axes with +1.28 to +1.56 pp mean R@10.
Karthik Ravula; Sathwik Kowtha; Rishabh Verma; Kala Mehak Jain et al. arXiv: 2611.07899
Compares skill-based retrieval in the main agent, a non-persistent retrieval subagent (findings response), and a persistent retrieval subagent that keeps retrieval history and returns evidence (with correction requests). Across five multi-turn settings: −43.3% agent-model tokens and −45.0% estimated API cost vs skill-based; −15.6s/question vs non-persistent (but +65.1% tokens / +29.1% cost vs that baseline).
Key insight: A persistent retrieval subagent that keeps history and returns evidence cut agent-model tokens 43.3% and API cost 45.0% versus skill-based retrieval in the main agent.
Hoang Tran Vuong; Ngoc Quan Pham; Hung Bui; Fatih Porikli et al. arXiv: 2611.07859
CORE: training-free harness—dense retrieve long passages, then late-interaction reranker similarities to return only the most relevant snippet; context management expands around already-retrieved sources and suppresses repeats. Beats Tongyi DeepResearch and OpenResearcher harnesses on BrowseComp-Plus/Wikipedia/CM with up to 553M-doc corpora across three agent models.
Key insight: Dense retrieve then late-interaction snippet return, with expand-around-sources and suppress-repeats, beat Tongyi DeepResearch and OpenResearcher on corpora up to 553M documents.
Vladimiros Peilivanidis arXiv: 2611.07652
Skillware: versioned capability bundles (typed JSON input, deterministic Python, directives, datasets, unit tests) exposed as native tools to cloud or local models. 23 models × 368 conditions: 3B–8B local models with Skillware beat unequipped frontier models on multi-step workflows; up to −84.8% tokens, −97.3% inference cost, zero parameter errors.
Key insight: Versioned executable capability bundles let 3B–8B local models beat unequipped frontier models on multi-step workflows, with up to 84.8% fewer tokens and 97.3% lower inference cost.
Haoyang Zhang; Qumeng Sun; Xiao Zhang; Xiang Liu et al. arXiv: 2611.07595
Evolver turns exploration traces into structured Gene assets (acquire/retrieve/evolve) without updating foundation weights; plugs into existing harnesses. On Claude Code and Codex across Terminal-Bench 2.1, SWE-bench Multilingual, SWE-rebench, GAIA: on 320 paired runs, success 83.13%→87.50% and −24.24% task tokens; among 265 dual-success pairs, −17.57% tokens.
Key insight: Turning exploration traces into reusable Gene assets without weight updates raised success 83.13% to 87.50% and cut task tokens 24.24% across Claude Code and Codex.
Jichao Li; Jinrong Lu; Manjiang Yu; Zhixuan Liu arXiv: 2611.07508
Defines personal external service agents: authorized by one person to serve clients with that person's knowledge, methods, and boundaries. DelegateEval platform framework over eight dimensions (creation ease, discovery, delivery, expertise inheritance, continuity, learning, governance, efficiency). Framework + experimental design only; datasets and cross-model results still to come.
Key insight: A platform framework for personal external service agents — authorized by one person to serve clients with that person's knowledge and boundaries — across eight evaluation dimensions.
Julian Kunkel; Ali Doosthosseini arXiv: 2611.08428
Ladder of meta access for chat UIs: tutoring → settings/prefs → retrieval over summaries/messages → confirmed mutation → full orchestration. Meta Chat prototype builds bounded context from summaries/settings/messages, confirmed reversible changes, persona recommendations. Argues agentic harnesses that can edit their own settings need a separate control-plane boundary.
Key insight: Chat UIs and agent harnesses that can mutate their own settings need a separate control-plane boundary: a ladder from tutoring through confirmed mutation to full orchestration.
E. Kelly Buchanan; Crystal Zhou; Scott W. Linderman; Christopher Ré arXiv: 2611.08417
Continuous-validation workflow for agentic benchmarks (community reports, artifacts, traces, oracle checks, human-gated repairs). Applied to Terminal-Bench 2.0: ~30% of tasks had issues; repairs → 2.1 raise accuracy >10pp and move ranks up to 3 places (Spearman ρ=0.958). Fixed wall-clock budgets matter: extending time closed a 20pp harness gap on GPT 5.4 and shrank a 30pp gap on GPT 5.4 mini to 5pp.
Key insight: Treating Terminal-Bench as living software found issues in about 30% of tasks; repairs raised accuracy more than 10 points and moved ranks up to three places.
Haibo Jin; Peng Kuang; Xiaopeng Yuan; Lucheng Fu et al. arXiv: 2611.07461
Argues frontier harnesses fail the 'last mile' (resource reachable but competence not reusable). Agent-native primitives: resource + resident LLM that applies it and talks to other primitives. HEELO composes/verifies/revises a library of primitives. Dev-Primitives: Terminal-Bench 4.0 37.3%→55.5% same backbone; Harness Primitives 60.0%→72.2% Pass@1 on TB 2.0; Tool Primitives ToolBench 55.8%→75.1%; on 46 heelo.dev tasks, Claude Code/Codex jump 9→39/35 completions via MCP with lower time/cost.
Key insight: Reusable agent-native primitives with a resident LLM raised Terminal-Bench 4.0 from 37.3% to 55.5% on the same backbone and lifted Claude Code/Codex from 9 to 39/35 completions on 46 real tasks.
Xiangkai Zeng; Zheng Liu; Zihao Lin arXiv: 2611.07166
Multi-step SWE: 69 tasks, each a chain of 5–15 dependent multi-hour steps on one codebase the agent itself wrote; 4 families, 9 languages, from-scratch and OSS. Strongest of 9 frontier models: 18.5% solve rate; 38/69 unsolved by any model. Public: multistepswe.com.
Key insight: On 69 multi-step coding chains of 5–15 dependent steps, the strongest of nine frontier models solved only 18.5%, and 38 tasks were unsolved by any model.
Melika Sepidband; Jiho Shin; Song Wang; Hadi Hemmati arXiv: 2611.07286
Five repository-map workflows (AST, call graph, module deps, docs-enriched search, hybrid) vs raw tools for Claude Code Haiku 4.5. LinuxFLBench: all maps raise recall@10 and cut tokens 25–39%. SWE-bench Pro: resolution near baseline with −17–26% tokens. SecBench/SWT-bench: mixed success, often more tokens/latency. Benefits are task-dependent.
Key insight: Repository maps (AST, call graph, module deps) raised localization recall and cut tokens 25–39% on LinuxFLBench, but patch and test gains were mixed and often cost more tokens.
Ahsan Habib Shihab; Imre Felde; Ramis Akhmedov; Stefan Gubo et al. arXiv: 2611.06996
TRAP maps Authorization Readiness Score (trust + stability + risk) to discrete authority levels with asymmetric rules: escalate only after consecutive above-band observations + margin; restrict immediately on sharp drop. Vs static/trust-only/risk-only/symmetric on 100 Monte Carlo traces. Advantage depends on abrupt degradation; gradual degradation over 5–20 intervals leaves authority too high for 15.9–18.9 of 20 intervals.
Key insight: Asymmetric trust-responsive authorization escalates only after consecutive above-band observations but restricts immediately — yet gradual degradation still leaves authority too high for most of a 20-interval window.
Yao Huang; Yifan Wang; Yitong Sun; Yichi Zhang et al. arXiv: 2611.07586
TraceMRT reframes side tasks as coherent sub-goals and searches trace-shaping strategies that look like natural execution. Black-box attacks reveal substantial vulnerabilities in GPT-5.2 and Claude-4.5 monitors. Bayesian Trajectory Monitoring (global context + local segments) reaches 0.91 AUC / 0.74 TPR@FPR=0.05.
Key insight: Black-box attacks that reframe side tasks as coherent sub-goals reveal substantial vulnerabilities in GPT-5.2 and Claude-4.5 CoT monitors; Bayesian trajectory monitoring reaches 0.91 AUC.
Dikshant Kukreja; Gautam Gupta; Avni Mittal; Avinash Anand et al. arXiv: 2611.07778
Mechanistic account of accuracy loss from irrelevant prompt noise (RAG/tool/long-context). Intrusion Pathway via MLPs + parroting heads; ~10 intrusion heads (~1%) largely weight-disjoint from helpful-context heads. Oracle residual swap recovers 97.6% of drop; deployable knockout of ~10 heads recovers 57%.
Key insight: About ten intrusion heads (~1%) largely weight-disjoint from helpful-context heads drive accuracy loss from irrelevant prompt noise; knocking them out recovers 57% of the drop.
Moonseok Choi; Jongwon Jeong; Minki Kang; Giung Nam et al. arXiv: 2611.07558
SKIM: first prune/distill framework for LLM agents under grammar-constrained structured generation. Partitions tokens into context/decision/format; category-aware saliency + on-policy distillation. Beats baselines especially at high sparsity on tool-calling and multi-step agent loops.
Key insight: Pruning LLM agents under grammar-constrained structured generation, with category-aware saliency over context/decision/format tokens, beats baselines especially at high sparsity.
Xuan Wang; Zhuanhao Wu; Tingzhu Fang; Xushi Li et al. arXiv: 2611.07542
FlashOffloading fully offloads KV to host DRAM in prefill and decode (rolling HBM prefill cache, hot decode cache, reverse sparse index, compute–load overlap). On GLM-5.2 MTP3 / Ascend910C PD-disagg under 30ms TPOT: prefill up to 1.38×, decode up to 1.91×. Integrated in vllm-ascend.
Key insight: Fully offloading KV cache to host DRAM with rolling HBM prefill and hot decode caches raised prefill up to 1.38× and decode up to 1.91× under a 30 ms TPOT budget.
Jinho Park; Se Young Chun; Mingoo Seok arXiv: 2611.08082
Dictionary + sparse coefficients from pretrained weights (no further training), then aggressive quantization. LLaMA-7B 5.1× compression with +2.9 WikiText-2 PPL; 3.6× higher compression than prior SOTA low-rank PTQ; Pareto-better on LM and zero-shot reasoning.
Key insight: Dictionary-plus-sparse post-training compression of LLaMA-7B reaches 5.1× with only +2.9 WikiText-2 PPL, 3.6× higher compression than prior low-rank PTQ.
Mengsong Wu; Tianchen Zhou; Zhaochen Su; Zhenhua Liu et al. arXiv: 2611.07932
AttnSR allocates step rewards from policy attention during replay (no separate reward model/extra rollouts). Qwen2.5-7B on ALFWorld: 91.2%→97.1% held-out; ScienceWorld improves every checkpoint with −29.9% env interactions.
Key insight: Allocating step rewards from policy attention during replay (no separate reward model) raised ALFWorld held-out success 91.2% to 97.1% and cut ScienceWorld env interactions 29.9%.
Ruifeng Ren; Gun Ahn arXiv: 2611.07051
Four levels (span/trace/conversation/engagement) along Execution–Substance–Trajectory–Results with Conduct constraints; Provenance/Adjudication certify evidence. Inner loop audits metrics; outer loop drives improvement via Agent Factory evaluators. Evidence+rule judgment beats holistic scoring (ICC 0.86 vs 0.81; κ 0.81 vs 0.63) on SharpInsight + public conversations.
Key insight: Evidence-plus-rule judgment across span/trace/conversation/engagement beats holistic scoring (ICC 0.86 vs 0.81) for continuous live-agent evaluation.
Yubo Wang; Rui Meng; Jaehyun Nam; Tomas Pfister et al. arXiv: 2611.08452
ReproBridge builds refined artifacts (codebase, env, launchers, guide). Bench: 1,029 tasks / 387 experiments / 36 papers. Refined artifacts raise mean reproduction 76.4%→92.6% and cut API spend 19.7%; cross-model spread 21.6→3.9 pp; all four models >90%.
Key insight: Refined reproduction artifacts raise mean reproduction 76.4% to 92.6%, cut API spend 19.7%, and shrink cross-model spread from 21.6 to 3.9 percentage points.
Mete Erdogan; Mirac Suzgun; Aneesh Pappu; Guowei Xu et al. arXiv: 2611.07667
Empirical information design across trade/bargaining/double auctions with 10 frontier LLMs. Finer disclosure helps some models and hurts others (e.g. GPT-6 Sol gains fall 98%→91% with exact vals; Claude Sonnet 5 rises 72%→86%; full disclosure collapses some auction welfare).
Key insight: In multi-agent LLM economies, finer information disclosure helps some models and hurts others; full disclosure can collapse auction welfare.
Vivek Acharya arXiv: 2611.06989
Two-Ledger Model: FOCUS settlement ledger + OpenTelemetry GenAI attribution ledger joined by correlation spine (trace, A2A/MCP metadata, business keys). Simulation: >99% cost coverage as trace propagation→0; mid-flight gating cuts p99 transaction cost up to 61% at 2–4% false-pause.
Key insight: Joining a settlement ledger to an OpenTelemetry GenAI attribution ledger via A2A/MCP correlation covers >99% of cost as trace propagation approaches zero; mid-flight gating cuts p99 transaction cost up to 61%.
Burkay Tunçtürk; Koorosh Aslansefat; Yiannis Papadopoulos; Bao Nguyen arXiv: 2611.07140
Extends HIP-LLM with a Bayesian failure-logic network for multi-agent systems. Majority of three models protected against the weakest but did not clearly beat the best; a voter failing on 5% of demands largely erases the advantage. More agents → more defensible reliability claim, not automatically more reliability.
Key insight: Majority voting of three models protects against the weakest but does not clearly beat the best; a voter that fails on 5% of demands largely erases the advantage.
Marek Deja arXiv: 2611.07945
Plain-text BPMN/DMN notation with MCP server; 2.2× fewer tokens than smallest BPMN XML; checker catches 98.2% of injected faults vs 85.8% XML Schema+bpmnlint. Agents with lean skill+checker: 97.6–100% valid tok; reading the full reference via tool costs 1.7–2.8× more tokens.
Key insight: A lean text BPMN/DMN skill plus checker tool yields 97.6–100% valid outputs at 2.2× fewer tokens than XML, while dumping the full reference costs 1.7–2.8× more tokens.
Sai Vallurupalli; Francis Ferraro arXiv: 2611.08196
SMART multi-agent framework curates complementary entity-state premises via role-based prompts across LLMs; knowledge-guided reasoning improves scientific-claim validation up to 20% on 3 datasets; real-world grounding adds up to 5%.
Key insight: Role-based multi-agent curation of complementary entity-state premises improves scientific-claim validation by up to 20% across three datasets.