ProtectSkills/MaliciousAgentSkillsBench

"Do Not Mention This to the User": Detecting and Understanding Malicious Agent Skills

A comprehensive security benchmark dataset and evaluation framework for Claude Code Agent Skills. We collect 98,380 skills from two major platforms (skills.rest and skillsmp.com), including 157 malicious samples identified through systematic security analysis.

Purpose

The code and data in this repository are intended exclusively for:

• Academic research on AI agent security
• Developing defense mechanisms against malicious agent skills
• Evaluating the robustness of AI agent platforms

Files

File	Rows	Description
skills_dataset.csv	98,380	Complete dataset (safe/suspicious/malicious)
malicious_skills.csv	157	Malicious samples with vulnerability patterns

Columns

skills_dataset.csv: source,repo,skill_name,classification,url

malicious_skills.csv: source,repo,skill_name,classification,Pattern

Usage

import pandas as pd

# Load dataset
df = pd.read_csv('skills_dataset.csv')
malicious = pd.read_csv('malicious_skills.csv')

Citation

@misc{malicious_agent_skills_bench,
  title={"Do Not Mention This to the User": Detecting and Understanding Malicious Agent Skills},
  author={Anonymous},
  year={2026},
}

GitHub: https://github.com/protectskills/MaliciousAgentSkillsBench

License

MIT License