guard

guard is a skill for Claude Code from lucas-flatwhite/gstack-ko. It costs 98 tokens per session (824 once invoked), scanned C, a copy of guard, MIT.

A manually triggered safety mode for coding work that warns about destructive commands and restricts edits to a directory you choose. Destructive commands include actions such as deleting files or dropping database tables.

In plain words
What is it for?
Use it when working on sensitive code or live systems and you want command warnings plus a fixed boundary for file edits.
Why use it?
It reduces the chance of damaging data or changing files outside the intended project area.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: names the AskUserQuestion tool; built for gstack.

Good fit Use it when working on sensitive code or live systems and you want command warnings plus a fixed boundary for file edits.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/lucas-flatwhite/gstack-ko/guard
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add lucas-flatwhite/gstack-ko --skill guard
Clone the repo
git clone --depth 1 https://github.com/lucas-flatwhite/gstack-ko

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for guard

README.md
[![agentmods](https://agentmods.dev/badge/skills/lucas-flatwhite/gstack-ko/guard/github.svg)](https://agentmods.dev/skills/lucas-flatwhite/gstack-ko/guard)
Your own site
<a href="https://agentmods.dev/skills/lucas-flatwhite/gstack-ko/guard"><img src="https://agentmods.dev/badge/skills/lucas-flatwhite/gstack-ko/guard/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for guard

Your own site · 80×15
<a href="https://agentmods.dev/skills/lucas-flatwhite/gstack-ko/guard"><img src="https://agentmods.dev/badge/skills/lucas-flatwhite/gstack-ko/guard.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 98 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 824 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin 86% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00098 $0.00824
Opus 5.5 $0.00039 $0.00330
Sonnet 5.5 $0.00020 $0.00165
Haiku 4.5 $0.00010 $0.00082

Measured 1mo ago against content hash 1941ab253f82, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

guard scanned grade C with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

Combines /careful (warns before rm -rf, DROP TABLE, force-push, etc.) with
Origin

This is a copy

86% identical to guard — 14 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

guard/SKILL.md · 84 lines

How it starts

The opening of the file, as written. The whole thing — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Reference-only note: 이 저장소는 upstream gstack의 한국어 문서 레이어입니다. 아래 내용은 upstream 설치본을 기준으로 한 reference이며, 실제 실행은 upstream 환경을 따라야 합니다.

/guard — Full Safety Mode

Activates both destructive command warnings and directory-scoped edit restrictions. This is the combination of /careful + /freeze in a single command.

Dependency note: This skill references hook scripts from the sibling /careful and /freeze skill directories. Both must be installed (they are installed together by the gstack setup script).

mkdir -p ~/.gstack/analytics
echo '{"skill":"guard","ts":"'$(date -u +%Y-%m-%dT%H:%M:%SZ)'","repo":"'$(basename "$(git rev-parse --show-toplevel 2>/dev/null)" 2>/dev/null || echo "unknown")'"}'  >> ~/.gstack/analytics/skill-usage.jsonl 2>/dev/null || true

Setup

Ask the user which directory to restrict edits to. Use AskUserQuestion:

  • Question: "Guard mode: which directory should edits be restricted to? Destructive command warnings are always on. Files outside the chosen path will be blocked from editing."
  • Text input (not multiple choice) — the user types a path.

Once the user provides a directory path:

  1. Resolve it to an absolute path:
FREEZE_DIR=$(cd "<user-provided-path>" 2>/dev/null && pwd)
echo "$FREEZE_DIR"
  1. Ensure trailing slash and save to the freeze state file:
FREEZE_DIR="${FREEZE_DIR%/}/"
STATE_DIR="${CLAUDE_PLUGIN_DATA:-$HOME/.gstack}"
mkdir -p "$STATE_DIR"
echo "$FREEZE_DIR" > "$STATE_DIR/freeze-dir.txt"
echo "Freeze boundary set: $FREEZE_DIR"

Tell the user:

  • "Guard mode active. Two protections are now running:"
  • "1. Destructive command warnings — rm -rf, DROP TABLE, force-push, etc. will warn before executing (you can override)"
  • "2. Edit boundary — file edits restricted to <path>/. Edits outside this directory are blocked."
  • "To remove the edit boundary, run /unfreeze. To deactivate everything, end the session."

What's protected

See /careful for the full list of destructive command patterns and safe exceptions. See /freeze for how edit boundary enforcement works.

Read the full file on GitHub · 84 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 84 lines · 98 tokens per session scan C 1941ab253f82

Subscribe to this mod's changes

guard is a skill published in the GitHub repository lucas-flatwhite/gstack-ko (44 stars, last pushed 6mo ago), licensed MIT. It adds 98 tokens to every session and 824 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it C with 1 finding (recursive force delete). It is 86% identical to guard, differing in 14 lines, and is treated as a copy.

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