Skill Hardening Certifier

Security Auditing for AI Agent Skills

The Skill Hardening Certifier is a specialized security tool designed for developers and platform operators who need to audit AI agent skills. As the ecosystem for agentic tools grows, so does the risk of prompt injection, data exfiltration, and unsafe code execution. Providing a simple prompt to an LLM isn't enough to catch subtle security flaws; you need a structured, rule-based scanning engine.

What it does

This skill performs a multi-stage security analysis on target skill directories. It parses SKILL.md files and associated helper scripts (Python, JavaScript, Shell) to identify critical vulnerabilities. The process involves:

• Automated Scanning: Detects prompt injection patterns, secret exfiltration, raw network calls, and unguarded shell execution.
• Severity Scoring: Categorizes findings from LOW to CRITICAL with actionable remediation hints.
• Automated Hardening: Generates a "hardened" version of the skill, applying mechanical fixes and inserting TODO flags where human judgment is required.
• Certification: Produces a formal security report and certificate summarizing the residual risk.

Why use this skill

Unlike general-purpose security scanners, this tool is specifically tuned for the unique threat model of LLM skills, such as instructions that attempt to override host agent safety protocols or bypass user approval. It provides a repeatable, verifiable pipeline to ensure the skills you deploy—or buy—meet a baseline security standard.

Built by Nex AI. More skills and info at nex-ai.be and slopsome.com.