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Security audit

Acoustic Guitar

Security checks for vulnerabilities and agentic risk

Overview

This is a simple acoustic guitar coaching and practice-log skill, with the main caveat that it may create a local practice folder and store progress notes there.

Before installing, be aware that the skill is designed to keep local guitar practice notes under ~/acoustic-guitar/. Use it if you are comfortable with local progress tracking, and ask the agent not to create or update logs unless you explicitly request it if you prefer advice-only use.

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 (2)

Vague Triggers

Medium
Confidence
94% confidence
Finding
The trigger list includes generic conditions like 'They mention practicing or learning songs' and 'They struggle with something specific,' which overlap with normal music-related discussion and do not clearly define when the skill should or should not activate. The section also lacks limiting context or negative examples to prevent accidental invocation.

Missing User Warnings

Low
Confidence
94% confidence
Finding
The skill instructs the agent to create `~/acoustic-guitar/` on first interaction without explicitly informing the user or obtaining consent. Even though the action appears harmless and aligned with the skill’s purpose, silent filesystem modification violates least surprise and can create privacy, clutter, or policy concerns in environments where file writes require user approval.

Static analysis

No suspicious patterns detected.