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Security audit

Coding Custom

Security checks for vulnerabilities and agentic risk

Overview

The skill is mostly a local coding-preference memory tool, but one referenced criteria file contradicts the main safety boundary by telling the agent to update SKILL.md.

Install only if you are comfortable with a local preference-memory skill and can ensure preferences are written only to ~/coding/memory.md or ~/coding/history.md. The publisher should fix criteria.md so it never instructs updates to SKILL.md or other skill source files.

A.I.G

Vulnerability Patterns
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • 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
Findings (1)

T02 · Agent Memory Poisoning

Warning
Location
criteria.md:3
Finding

Persistent Instruction-File Modification Ambiguity

Content
View full analysis
Remediation
View remediation

SkillSpector

Vulnerability Patterns
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Rogue AgentSelf-Modification, Session Persistence
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (3)

Self-Modification

High
Category
Rogue Agent
Confidence
88% confidence
Finding

The file explicitly guides when to update SKILL.md, which enables persistent self-modification of the agent’s coding preference memory based on user interactions. Even though framed as normal preference management, persistence logic can be abused by a malicious user to inject long-lived instructions or unsafe defaults that affect later sessions beyond the original context.

Content

Scanner excerpt · criteria.md (reported line 3)May include surrounding context.

md
# Criteria for Code Preferences

Reference only — consult when deciding whether to update SKILL.md.

## When to Add

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
75% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 49)May include surrounding context.

md
This skill NEVER:
- Reads project files to infer preferences
- Observes coding patterns without consent
- Makes network requests
- Reads files outside `~/coding/`
- Modifies its own SKILL.md

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
75% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 98)May include surrounding context.

md
## Common Traps

- Adding preferences without confirmation → user loses trust
- Inferring from project structure → privacy violation
- Exceeding 100 lines → context bloat
- Vague entries ("good code") → useless, be specific

Static analysis

No suspicious patterns detected.