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Security audit

Electric Guitar

Security checks for vulnerabilities and agentic risk

Overview

This electric guitar coaching skill is benign, with disclosed local practice logging that users should treat as personal data.

Before installing, understand that the skill may create ~/electric-guitar/ and keep local notes about songs, techniques, goals, and practice sessions. Only approve logging when you want those details saved, especially if your practice notes are private.

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
95% confidence
Finding
The logging triggers are broad enough to activate during ordinary discussion of practicing, learning songs, or technique struggles, which can lead the agent to collect and store user activity data more often than the user explicitly requested. In a progress-tracking skill this is contextually related behavior, but the lack of tighter gating or consent still creates an over-collection and privacy-boundary risk.

Static analysis

No suspicious patterns detected.