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Security audit

invoice-rounding-calculator

Security checks for vulnerabilities and agentic risk

Overview

This is a narrow invoice rounding helper that uses user-supplied invoice information and shows no hidden execution, persistence, or credential access.

Before installing, confirm you want the agent to use this helper for invoice rounding guidance and invoice summary calculations. It should not need credentials, private files, or authority to change accounting records.

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
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • 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)

Vague Triggers

Medium
Confidence
92% confidence
Finding
The phrase 'Use this skill for routine invoice preparation work' is broad everyday business language and does not clearly bound when this skill should or should not activate. Although later sections mention stage-specific requests, this top-level trigger description lacks concrete constraints or negative examples, increasing the risk of unintended invocation.

Static analysis

No suspicious patterns detected.