arxiv: 2605.11360 · v1 · submitted 2026-05-12 · 💻 cs.CR · cs.AI· cs.SE

Recognition: 2 theorem links

· Lean Theorem

Options, Not Clicks: Lattice Refinement for Consent-Driven MCP Authorization

Faysal Hossain Shezan, Issac Khabra, Peiran Wang, Yanju Chen, Ying Li, Yuan Tian, Yu Feng

Authors on Pith no claims yet

Pith reviewed 2026-05-13 02:33 UTC · model grok-4.3

classification 💻 cs.CR cs.AIcs.SE

keywords risk latticeconsent managementModel Context ProtocolMCP authorizationtool invocationpolicy refinementescalation detection

0 comments

The pith

A risk lattice with refinement turns user decisions into reusable rules for scoped MCP tool consent.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper develops Conleash, a client-side middleware, to address consent fatigue in Model Context Protocol tool use by replacing broad always-allow toggles or opaque decisions with boundary-scoped authorization. It organizes tool call risks in a lattice that auto-permits safe arguments within known boundaries, escalates risky ones, enforces user-defined policies, and refines those boundaries from each decision into reusable rules. This approach aims to maintain security against dangerous escalations while minimizing prompts. Tests on 984 real traces show 98.2 percent accuracy and 99.4 percent escalation catch rate at 8.2 ms overhead, and a 16-person user study finds preference for the scoped method due to higher trust.

Core claim

Conleash models tool-call risks as a lattice to enforce boundary-scoped authorization that auto-permits calls inside safe regions, escalates those outside, applies a policy engine for invariants, and runs a refinement loop that converts each user decision into a reusable rule for future calls.

What carries the argument

risk lattice with refinement loop, which structures call arguments by risk level to separate automatic approval from escalation and converts decisions into persistent rules.

If this is right

Calls inside established boundaries receive automatic permission without further prompts.
Risky arguments trigger escalation and user review to prevent unsafe actions.
Each user decision adds a reusable rule, lowering the number of future interventions.
Policy verification overhead stays under 10 ms on real traces.
Users experience higher trust and fewer prompts than with broad permission toggles.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

The same lattice structure could support consent management for other agent-tool protocols beyond MCP.
Over longer use the refinement loop might stabilize into a small set of per-user rules.
Initial lattice boundaries could be seeded from common tool documentation to reduce early escalations.

Load-bearing premise

The lattice boundaries correctly classify most tool-call arguments as safe or risky without frequent misclassifications on unseen invocations.

What would settle it

A production tool call that the lattice auto-permits but later proves harmful, or a safe call that triggers repeated escalations leading to user overrides.

Figures

Figures reproduced from arXiv: 2605.11360 by Faysal Hossain Shezan, Issac Khabra, Peiran Wang, Yanju Chen, Ying Li, Yuan Tian, Yu Feng.

**Figure 1.** Figure 1: Consent dialogs when an agent calls send_email_with_attachment to email a financial report. ❶ Auto mode executes silently with no user oversight. ❷ Tool-level consent offers only Allow or Always Allow; choosing “Always Allow” silently authorizes all future emails with arbitrary recipients and attachments. ❸ ConLeash presents boundary-scoped options that let the user control which files may be attached and … view at source ↗

**Figure 2.** Figure 2: A motivating example showing how standard tool-call authorization (b) enables silent privilege escalation, whereas [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗

**Figure 4.** Figure 4: The policy language in ConLeash. 5.2 Abstraction While the policy language defines the syntax for authorization, raw tool invocations operate in an infinite space of concrete values. To reason effectively about these invocations, we define the Abstraction procedure, which projects a raw call 𝑐 into a finite flow summary 𝜑. This procedure, central to the runtime enforcement loop (Algorithm 1), distills co… view at source ↗

**Figure 6.** Figure 6: Boundary-crossing recall on 50 real-world agent [PITH_FULL_IMAGE:figures/full_fig_p011_6.png] view at source ↗

**Figure 7.** Figure 7: Example benchmark trace. Step 1 (Ask): establishes consent bound; Step 2 (Allow): auto-permitted via consent reuse; Step 3 (Ask): sensitivity escalation; Step 5 (Deny): blocked by invariant. B User Study Supplemental Materials This appendix provides detailed materials for the user study described in §8.3, including the study design, task descriptions, and questionnaire items. B.1 User Study Design Partici… view at source ↗

**Figure 8.** Figure 8: Subjective ratings for Baseline and ConLeash (N = 16). Each dot represents one participant’s response; diamonds mark medians. Dashed lines connect median values to highlight the direction of change. (d) Always B.4 Post-task Feedback After completing all tasks with both interfaces (Phase 2), participants completed the following post-task questionnaire in Phase 3. Part 1: Likert-Scale Ratings. For each int… view at source ↗

**Figure 9.** Figure 9: Prompt template for per-call abstraction. [PITH_FULL_IMAGE:figures/full_fig_p017_9.png] view at source ↗

**Figure 10.** Figure 10: Prompt template for invariant synthesis. [PITH_FULL_IMAGE:figures/full_fig_p017_10.png] view at source ↗

**Figure 11.** Figure 11: Prompt template for invariant verification. [PITH_FULL_IMAGE:figures/full_fig_p018_11.png] view at source ↗

read the original abstract

As Model Context Protocol adoption grows, securing tool invocations via meaningful user consent has become a critical challenge, as existing methods, broad always allow toggles or opaque LLM-based decisions, fail to account for dangerous call arguments and often lead to consent fatigue. In this work, we present Conleash, a client-side middleware that enforces boundary-scoped authorization by utilizing a risk lattice to auto-permit safe calls within known boundaries while escalating risks, a policy engine for user-defined invariants, and a refinement loop that converts user decisions into reusable rules. Evaluated on 984 real-world traces, Conleash achieved 98.2% accuracy, caught 99.4% of escalations, and added only 8.2 ms of overhead for policy verification; furthermore, in a user study where N=16, participants significantly preferred Conleash scoped permissions over traditional methods, citing higher trust and reduced prompting.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

Conleash gives a workable lattice-plus-refinement approach to scoped MCP permissions that could ease consent fatigue, but the 98.2% accuracy on 984 traces cannot be evaluated without knowing how the ground-truth labels were produced.

read the letter

Conleash combines a risk lattice with a refinement loop to handle scoped permissions for MCP tool calls, which could cut down on consent fatigue, but the reported accuracy on the traces is difficult to assess without knowing how the safe/dangerous labels were determined independently. The main contribution is the client-side system that auto-permits calls inside known risk boundaries using the lattice, escalates when needed, and then incorporates user overrides into future rules. This is paired with a policy engine for custom invariants. It's a practical take on authorization for AI agents that interact with external tools, and it targets a real issue as MCP gains traction. What stands out is the focus on argument-level risks rather than just broad permissions. The numbers they give—98.2% accuracy, 99.4% escalation catch rate, 8.2 ms overhead on 984 traces—sound promising at first glance, and the user study suggests people like the scoped approach better than traditional methods. The issue is that without details on trace labeling, lattice construction, or boundary selection, it's hard to tell if the accuracy reflects genuine generalization or if it's tied to how the data was prepared. The stress test points out that if labels depend on the system itself, the claims become circular. The user study is also small at N=16, so the preference results are more suggestive than conclusive. Overall, this seems aimed at developers and researchers working on secure AI tool use in consumer or enterprise settings. It has enough structure to be worth discussing, and the idea of learning rules from decisions is worth exploring further. I would recommend sending it for peer review after they add more on the evaluation methodology, because the problem is important and the approach is concrete enough to benefit from feedback.

Referee Report

3 major / 2 minor

Summary. The paper introduces Conleash, a client-side middleware for Model Context Protocol (MCP) tool invocations that uses a risk lattice to auto-permit safe calls within known boundaries, escalates risky calls, incorporates a policy engine for user-defined invariants, and includes a refinement loop to convert user decisions into reusable rules. It reports evaluation results on 984 real-world traces showing 98.2% accuracy, 99.4% escalation catch rate, and 8.2 ms policy verification overhead, plus a user study (N=16) where participants preferred the scoped permissions for higher trust and reduced prompting.

Significance. If the evaluation methodology proves sound and the lattice generalizes, Conleash could meaningfully improve the security-usability tradeoff in AI agent authorization by reducing consent fatigue while providing structured, refinable risk boundaries and reusable policies, offering a concrete alternative to broad toggles or opaque LLM decisions.

major comments (3)

[Evaluation] The evaluation reports 98.2% accuracy and 99.4% escalation catch rate on 984 traces, but provides no description of how ground-truth safe/dangerous labels were assigned (e.g., independent expert annotation, post-hoc review, or hold-out set). If labels derive from the refinement loop or boundary tuning on the same traces, the metrics risk circularity and do not demonstrate generalization to unseen invocations.
[Lattice and Policy Engine] No details are given on risk lattice construction, boundary selection criteria, or trace selection methodology. These omissions make it impossible to assess reproducibility, the separation power of the lattice, or whether boundaries were chosen independently of the evaluated traces.
[User Study] The user study (N=16) claims significant preference for Conleash over traditional methods on trust and prompting, but omits the experimental protocol, statistical tests, effect sizes, or controls for bias, weakening support for the usability claims.

minor comments (2)

[Abstract] The abstract introduces MCP without expansion; consider spelling out Model Context Protocol on first use.
[Evaluation] Consider adding a table or figure summarizing the 984-trace dataset characteristics (e.g., distribution of call types, escalation frequency) to aid interpretation of the accuracy numbers.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for their constructive and detailed comments on our paper. We appreciate the feedback highlighting the need for greater clarity on evaluation methodology, lattice construction, and user study details. We address each major comment below and will revise the manuscript to incorporate the requested information.

read point-by-point responses

Referee: [Evaluation] The evaluation reports 98.2% accuracy and 99.4% escalation catch rate on 984 traces, but provides no description of how ground-truth safe/dangerous labels were assigned (e.g., independent expert annotation, post-hoc review, or hold-out set). If labels derive from the refinement loop or boundary tuning on the same traces, the metrics risk circularity and do not demonstrate generalization to unseen invocations.

Authors: We agree that the ground-truth labeling process must be described explicitly to allow proper assessment of the metrics and to address concerns about circularity. The manuscript focused on reporting the performance numbers but did not detail the labeling procedure. Labels were assigned through post-hoc expert review by two independent security researchers using a fixed rubric derived from MCP security guidelines; the reviewers had no access to the system's outputs or refinement decisions during labeling. The 984 traces were partitioned into a development set (used for initial boundary tuning and refinement loop iterations) and a held-out test set (used for the reported metrics). We will revise the Evaluation section to include a full description of the annotation process, the hold-out split, and steps taken to maintain independence from the refinement loop. revision: yes
Referee: [Lattice and Policy Engine] No details are given on risk lattice construction, boundary selection criteria, or trace selection methodology. These omissions make it impossible to assess reproducibility, the separation power of the lattice, or whether boundaries were chosen independently of the evaluated traces.

Authors: We acknowledge that the manuscript provides insufficient detail on risk lattice construction, boundary selection, and trace selection, limiting reproducibility assessment. The lattice was constructed from a hierarchical taxonomy of MCP tool risks (data access, execution privileges, and side effects) with initial boundaries set by expert-defined thresholds on a small pilot collection of traces collected prior to the main 984-trace dataset. Trace selection drew from anonymized, consented real-world MCP usage logs. We will add a dedicated subsection in the System Design portion of the revised manuscript that describes the lattice construction process, the exact boundary selection criteria, the pilot-versus-main trace separation, and the sampling methodology. revision: yes
Referee: [User Study] The user study (N=16) claims significant preference for Conleash over traditional methods on trust and prompting, but omits the experimental protocol, statistical tests, effect sizes, or controls for bias, weakening support for the usability claims.

Authors: We agree that the user study section is too concise and should supply the full protocol, statistical analysis, effect sizes, and bias controls to substantiate the preference claims. The study employed a within-subjects design with counterbalanced condition order, identical task sets for both Conleash and the baseline (always-allow) condition, and post-task Likert questionnaires. Statistical analysis used Wilcoxon signed-rank tests with rank-biserial correlation for effect sizes. We will expand the User Study section in the revision to include the complete experimental protocol, recruitment details, task descriptions, questionnaire items, exact statistical tests and results (p-values and effect sizes), and the bias-mitigation measures such as counterbalancing and blinding. revision: yes

Circularity Check

0 steps flagged

No circularity: empirical accuracy claims are direct measurements, not self-referential predictions or derivations.

full rationale

The paper describes a system (risk lattice, policy engine, refinement loop) and reports direct empirical results on 984 traces (98.2% accuracy, 99.4% escalation catch rate, 8.2 ms overhead) plus a small user study. No equations, first-principles derivations, or fitted parameters are presented that reduce by construction to the inputs or to the refinement process itself. The evaluation numbers are presented as measured outcomes on real-world traces rather than predictions derived from the same data or labels. Absent any quoted reduction showing that accuracy is tautological with the lattice boundaries or user overrides, the central claims remain independent measurements. This is the normal non-circular case for an applied systems paper.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review; no explicit free parameters, axioms, or invented entities are stated. The risk lattice itself functions as an implicit structuring assumption whose construction details are not provided.

pith-pipeline@v0.9.0 · 5476 in / 1280 out tokens · 43546 ms · 2026-05-13T02:33:16.625433+00:00 · methodology

discussion (0)

Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

IndisputableMonolith/Foundation/AbsoluteFloorClosure.lean reality_from_one_distinction unclear
We structure the space of all possible flow summaries as a formal risk lattice L... φ⊑φ′ ⇐⇒ (li⊑l′i)∧(lo⊑l′o)∧(τ⊑τ′)∧(E⊑E′)
IndisputableMonolith/Foundation/AlexanderDuality.lean alexander_duality_circle_linking unclear
the risk lattice is constructed as the product of three dimensional sub-lattices... loc_order(exact,parent), loc_order(parent,local)

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DENY_INV ARIANT — hard block, non -overridable ## Examples [... few-shot examples mapping natural -language invariants to Datalog rules, covering dimension-based, content -based, and tool-specific patterns ...] ## Tools Used in This Session {{ tool_descriptions }} ## Task Convert the following invariants to Datalog rules:

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