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Security audit

List Hygiene Monitor

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed email list-health analysis workflow that reads user-provided marketing data and produces hygiene recommendations, with memory writes gated on user approval.

Install only if you are comfortable giving the agent access to email engagement exports, bounce/complaint reports, and suppression history. Review any prune or suppression recommendations before applying them in your ESP, because the skill produces a worklist and evidence reads, not a final consent or deletion authority.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (1)

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
75% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 70)May include surrounding context.

md
## Save Results

After delivering, ask "Save these results for future sessions?" If yes, write the hygiene report + the segmented worklist and the reusable SEND-`S`/`E` summary to `memory/email/list-hygiene-monitor/YYYY-MM-DD-<list-or-topic>.md` — see [skill-contract.md §Save Results Template](../../../references/skill-contract.md) — so the next scheduled run can trend against it. Promote hygiene blockers and the `S`/`E` reads to `memory/hot-cache.md` and add unresolved fixes (suppression leakage, an over-benchmark trend) to `memory/open-loops.md`. Do not write memory without asking.

## Reference Materials