hidden-code-skill SKILL.md skillA
hidden-code-skill from claude-world/claude-skill-antivirus is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add claude-world/claude-skill-antivirus/hidden-code-skill@git:20261021.34296ffPins git:20261021.34296ff in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- claude-world/claude-skill-antivirus
- Path
examples/hidden-code-skill/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261021.34296ff, committed Oct 21, 2026
- Size
- 267 bytes
- Repository stars
- 80
- License
- MIT
A perfectly innocent-looking skill whose manifest hides nothing.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# 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.
Read the whole file at its exact version.
How to install
mdr add claude-world/claude-skill-antivirus/hidden-code-skill@sha256:e4cdfcc49ef5ebb3The line at the top of this page pins the label git:20261021.34296ff, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_vb3un34jml4aauuv)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 21, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (267 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
claude-world/claude-skill-antivirus · 80 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_vb3un34jml4aauuv GET https://markdownregistry.com/api/v1/resolve?ref=claude-world/claude-skill-antivirus/hidden-code-skill GET https://markdownregistry.com/api/v1/blob/e4cdfcc49ef5ebb3dbb90c162b849c1d5279df854f071e5b5c6f6526e9c39cf3
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.