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Security audit

Water Heater Buying Consultant

Security checks for vulnerabilities and agentic risk

Overview

This is a plain instruction-only water-heater buying guide with no hidden execution, credential use, persistence, or system access.

Installers should treat this as buying guidance, not professional installation advice. Users should independently verify current model availability/specs and use licensed professionals for electrical or gas installation decisions.

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 311)May include surrounding context.

md
1. **Sizing by number of people alone without accounting for peak simultaneous demand** — A tank sized for "a family of four" based on a generic rule may still run cold if two showers run simultaneously and the recovery rate is slow. First-Hour Rating (FHR) against the household's actual peak-hour demand is the correct sizing method, not headcount alone.

2. **Choosing an instant electric water heater without checking circuit capacity** — A whole-house instant electric heater requires 6–11 kW of continuous power (equivalent to running 6–11 electric kettles simultaneously). Many homes — particularly older properties or those in developing markets with limited electrical infrastructure — do not have circuits rated for this. Installing such a unit on an under-rated circuit is a fire risk.

3. **Buying a heat pump water heater for a small, cold, or sealed utility space** — HPWHs work by extracting heat from surrounding air. They require a minimum ambient temperature of about 10°C to operate efficiently and a surrounding air volume of at least 28 m³ (1,000 ft³). In a small sealed cupboard or a cold unheated space in a northern climate in winter, efficiency drops sharply or the unit switches to inefficient backup resistance heating.