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Security audit

China Holiday

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward China holiday lookup tool that calls a disclosed public API and does not show hidden, persistent, or destructive behavior.

Before installing, be aware that holiday queries require outbound requests to timor.tech and output is primarily Chinese. I found no evidence that the skill reads local private data, uses credentials, installs dependencies, persists across sessions, or executes remote code.

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
  • 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
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (3)

Lp3

Medium
Category
MCP Least Privilege
Confidence
91% confidence
Finding
The skill documentation states it requires network access to call an external API, but it does not declare any explicit tool scope or permissions boundary. This creates a mismatch between documented behavior and declared capabilities, which can lead to overbroad execution in a host environment or prevent reviewers from understanding and approving the external data flow.

Natural-Language Policy Violations

Low
Confidence
91% confidence
Finding
The manifest description and main heading/content instruct and describe the skill only in Chinese, which effectively forces a specific language experience. The file does not offer an opt-in language choice or explicitly justify the language restriction as a documented locale-specific policy.

Natural-Language Policy Violations

Low
Confidence
94% confidence
Finding
The top-level description and usage text are written entirely in Chinese, indicating the skill is designed to operate in a single language without any user opt-in or alternative locale support. This matches the policy category for language/locale constraints expressed in natural language.

Static analysis

No suspicious patterns detected.