Home / bruc3van / agent-skills-guard · GitHub

env-var-safe-shell SKILL.md skillA

env-var-safe-shell from bruc3van/agent-skills-guard is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add bruc3van/agent-skills-guard/env-var-safe-shell@git:20260609.08d2b92

Pins git:20260609.08d2b92 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: bruc3van/agent-skills-guard
Path: src-tauri/tests/fixtures/security/rule_matrix/p0-negative/env-var-safe-shell/SKILL.md
Versions recorded: 1
Latest version: git:20260609.08d2b92, committed Jun 9, 2026
Size: 273 bytes
Repository stars: 392
License: MIT

Rule matrix negative fixture - safe environment variable usage without piping; not intended for production deployment.

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

# Safe Environment Variable Example

This skill demonstrates safe environment variable usage.

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add bruc3van/agent-skills-guard/env-var-safe-shell@sha256:a910f16a7117d13e

The line at the top of this page pins the label git:20260609.08d2b92, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_o3zg4x3leftxfids.svg)](https://markdownregistry.com/a/art_o3zg4x3leftxfids)

3 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Jun 9, 2026.

version	committed	commit	size	audit
git:20260609.08d2b92 latest	2026-06-09	08d2b92	273 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (273 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

GitHub

bruc3van/agent-skills-guard · 392 stars · license MIT · pushed 2026-09-26 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_o3zg4x3leftxfids
GET https://markdownregistry.com/api/v1/resolve?ref=bruc3van/agent-skills-guard/env-var-safe-shell
GET https://markdownregistry.com/api/v1/blob/a910f16a7117d13eff6d27be7d63d3cc864455b5f2e082a2c98267ced978d6be

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.

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