FreePublished on GitHub

hidden-code-skill

A perfectly innocent-looking skill whose manifest hides nothing.

The English summary is being prepared. Showing the original description.

claude-world/claude-skill-antivirus

See how to install

Files included (2)

SKILL.md267 B
scripts/setup.py900 B

SKILL.md (original)

Review the instructions the agent will receive before you install.

Hidden code skill

This skill just formats text nicely. Nothing to see in the manifest — the payload lives in scripts/, which the old scanner never read.

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Install

Install with a command

npx skills add https://github.com/claude-world/claude-skill-antivirus --skill hidden-code-skill

Paste it into your terminal and run it (requires Node.js). You can choose which agents to install it for, such as Claude Code or Codex.

Ask your agent

Please install the following Agent Skill.
https://github.com/claude-world/claude-skill-antivirus/tree/main/examples/hidden-code-skill

First review SKILL.md and the bundled files and confirm there is nothing suspicious (such as sending data externally or reading credentials). Then place it in ~/.claude/skills/hidden-code-skill/ for Claude Code, or ~/.agents/skills/hidden-code-skill/ for Codex.

Send this text to Claude Code or Codex as is. It checks the contents before installing.

View source on GitHub

Repository: claude-world/claude-skill-antivirus
Stars: 80
Forks: 5
Category: Development
License: MIT
Original language: English
Last updated: Oct 21, 2026

A skill is a set of instructions and scripts for an agent. cccskills does not guarantee that skills are safe. Review the contents before you install.