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Security audit

Skill Creator

Security checks for vulnerabilities and agentic risk

Overview

This skill scaffolds new agent-skill packages using a local Python script, with no evidence of hidden network access, credential use, persistence, or destructive behavior.

Before installing, understand that this skill is intended to create new files in a chosen output directory. Confirm the destination path before letting it scaffold, and review generated TODO templates before publishing or running any generated scripts.

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
Vulnerability Patterns
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
Findings (4)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
93% confidence
Finding

The skill instructs the agent to generate a directory skeleton and explicitly run a scaffold script that creates files, but it does not declare any tool scope such as allowed-tools or permissions. That mismatch can let a host agent invoke the skill in contexts where file-write behavior is not clearly constrained or disclosed, increasing the chance of unintended filesystem modification.

Content

No source excerpt is available for this finding.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The trigger phrases are very broad, such as general requests to 'help me create a new skill' or 'turn this workflow into a skill,' which overlap with ordinary assistance requests. In an auto-routing or loosely matched skill system, this can cause unintended invocation and lead the agent into file creation or script execution workflows the user did not specifically consent to.

Content

No source excerpt is available for this finding.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
89% confidence
Finding

The guidance explicitly encourages broad synonym coverage and inclusion of common user phrasings to maximize invocation recall, but it does not pair that advice with equally strong boundary-setting requirements. In a skill-creation context, this can produce SKILL.md descriptions that over-trigger on loosely related requests, causing the wrong skill to activate and increasing the chance of unintended file creation or workflow execution.

Content

No source excerpt is available for this finding.

Scope Creep

Low
Category
Excessive Agency
Confidence
75% confidence
Finding

Skill's behavior or capabilities extend beyond its stated purpose. Scope creep allows an agent to perform actions unrelated to its documented functionality, increasing the attack surface.

Content

Scanner excerpt · SKILL.md (reported line 117)May include surrounding context.

md
- Generate the skeleton before asking the user to write content
- Show the user what was generated and explain what each file is for
- Write draft content for the user to review rather than asking them to write from scratch
- Preserve the user's original intent; do not expand scope unless asked
- Always run the scaffold script rather than creating files manually

## Notes and Constraints

Static analysis

No suspicious patterns detected.