Security audit

Penfield

Security checks for vulnerabilities and agentic risk

Overview

This memory skill is coherent, but it deserves review because it persistently stores and syncs agent context and files with an external service while using mutable npm-based install paths.

Review this before installing if you handle confidential, regulated, or company-sensitive information. Use it only when you are comfortable with a cloud memory service retaining and syncing selected memories and files across tools, avoid storing secrets or raw private data, and prefer pinned package versions or a controlled install environment.

A.I.G

Vulnerability Patterns

Insecure DependenciesIntroduces malicious components through unsafe dependency sources
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

Findings (2)

T08 · Insecure Dependencies

Warning

Location: SKILL.md:4
Finding: Unpinned Third-Party Packages Permit Unreviewed Supply-Chain Code Execution
Content: View full analysis
Remediation: View remediation

other

Warning

Location: SKILL.md:17
Finding: Conversation-Derived Sensitive Information May Be Persisted to an External Service
Content: View full analysis
Remediation: View remediation

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 (2)

Missing User Warnings

Medium

Category: Not specified by scanner
Confidence: 94% confidence
Finding: The skill is explicitly designed for persistent storage of conversations, preferences, context, and artifacts across sessions, but the introductory documentation does not prominently warn users about privacy implications, retention, or sensitivity of stored data. In a memory skill, this omission is materially risky because users may disclose personal, confidential, or regulated information without understanding that it will be retained and reused later.
Content: No source excerpt is available for this finding.

Missing User Warnings

Medium

Category: Not specified by scanner
Confidence: 96% confidence
Finding: The documentation encourages connecting to remote MCP and API endpoints and syncing the same memory/artifact store across tools, but it does not clearly warn that recalled/stored memories and files may be transmitted to external services. Because this skill handles durable user context and artifacts, remote connectivity expands exposure beyond local use and increases the chance of unintentionally sending sensitive data to a third-party service.
Content: No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.