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Security audit

skillguard

Security checks for vulnerabilities and agentic risk

Overview

SkillGuard is a disclosed hosted security-audit skill that sends user-selected skill content to its API, with API-key setup and redaction guidance clearly documented.

Before installing, be aware that audits are performed by a hosted service: only submit skills and reference files you are allowed to share, redact secrets and proprietary material first, and use a least-privilege API key where possible.

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
  • 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 (4)

Natural-Language Policy Violations

Medium
Category
Not specified by scanner
Confidence
91% confidence
Finding

The file’s user-facing natural-language instructions and descriptions are entirely in Chinese, including installation and operation guidance. This can violate a language/locale policy when the skill forces a specific language without user opt-in and does not state that the skill is intentionally limited to a Chinese-speaking or region-specific audience.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Medium
Category
Not specified by scanner
Confidence
86% confidence
Finding

This markdown file is written entirely in Chinese and presents mandatory behavioral rules without any indication that the user may choose another language or that the restriction is required for a specific regional or compliance context. Under the policy, forcing a specific language without opt-in is a natural-language policy violation.

Content

No source excerpt is available for this finding.

External Transmission

Medium
Category
Data Exfiltration
Confidence
81% confidence
Finding

This documentation instructs users to transmit audit inputs to an external endpoint, including authorization credentials and the submitted skill content. External transmission is expected for a hosted audit API, but it still represents a real security/privacy risk if users are not clearly informed that sensitive local content will leave their environment.

Content

Scanner excerpt · references/HTTP-REQUESTS.md (reported line 8)May include surrounding context.

bash
API_ROOT="${AI_SKILLS_API_URL:-https://ai-skills.open-idea.net}/api/v1"

curl --fail-with-body "$API_ROOT/skillguard/audit" \
  -H "Authorization: Bearer ${SKILLGUARD_API_KEY:-$AI_SKILLS_API_KEY}" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: audit-uuid-001" \

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
90% confidence
Finding

The example request sends full skill content and embedded file contents to a remote API, but the documentation does not prominently warn that proprietary code, prompts, secrets, or personal data may be transmitted off-host. In a security-audit context this is materially relevant because users may paste third-party skills for scanning and unintentionally disclose sensitive data to the service.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.