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Security audit

TOON

Security checks for vulnerabilities and agentic risk

Overview

This skill is a TOON format guide whose file-writing behavior is expected for its purpose and it contains no executable code or hidden persistence.

Before installing, understand that an agent using this skill may prefer .toon files for summaries, logs, schedules, reports, or other stored context. Review where your agent normally writes skill-generated files if you need strict control over saved session data.

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

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
90% confidence
Finding

The README states that agents automatically process .toon files and specifically mentions writing summaries, storing data, and generating reports, but it does not warn users that enabling or adopting this format may modify local files or session artifacts. In an agent skill context, undocumented automatic writes increase the risk of unintended persistence, overwriting user data, or silently altering logs/configuration, especially if users install the skill expecting a passive format description rather than behavior that affects state.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.