claude-skills-generator: Hook for Claude Code

.claude/settings.json

PreToolUse is a hook for Claude Code from martinholovsky/claude-skills-generator. Its token cost is not measured, scanned C, original, Unlicense.

A safety check that runs before Bash commands, which are terminal instructions for macOS or Linux. It looks for a small set of especially dangerous commands, such as deleting broad paths or dropping a database table.

In plain words
What is it for?
Use it as a pre-command guard for Bash tool calls, especially when protecting files and database tables from destructive commands.
Why use it?
It can stop a matching command before it runs and reduces the chance of accidental deletion or database damage.

Hook for Claude Code

Written for Claude Code: PreToolUse hook event.

This is martinholovsky/claude-skills-generator's own configuration. It tells Claude Code how to work on claude-skills-generator itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything claude-skills-generator configures →

One of 4 entries in settings.json upstream. Installing this one merges just its entry into your config; the other 3 are separate, each on its own page.

Reuse

Borrowing it

Nothing to install: this file belongs to martinholovsky/claude-skills-generator. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/martinholovsky/claude-skills-generator/main/.claude/settings.json
Clone the repo
git clone --depth 1 https://github.com/martinholovsky/claude-skills-generator

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 PreToolUse

README.md
[![agentmods](https://agentmods.dev/badge/hooks/martinholovsky/claude-skills-generator/pre-tool-use/github.svg)](https://agentmods.dev/hooks/martinholovsky/claude-skills-generator/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/martinholovsky/claude-skills-generator/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/martinholovsky/claude-skills-generator/pre-tool-use/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 PreToolUse

Your own site · 80×15
<a href="https://agentmods.dev/hooks/martinholovsky/claude-skills-generator/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/martinholovsky/claude-skills-generator/pre-tool-use.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan C 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Security

Grade C, and why

PreToolUse 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 9d ago.

A static scan of the commands this hook runs, not an audit. A hook is shell that executes on your machine at the event it names, which is why every command in it is printed with what was found.

Recursive force deletehighDestructive command

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

"command": "echo \"$CLAUDE_BASH_COMMAND\" | grep -qE 'rm -rf /|rm -rf ~|DROP TABLE' && echo 'BLOCKED: Dangerous command' && exit 2 || exit 0"
.claude/settings.json · 13 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "echo \"$CLAUDE_BASH_COMMAND\" | grep -qE 'rm -rf /|rm -rf ~|DROP TABLE' && echo 'BLOCKED: Dangerous command' && exit 2 || exit 0"
        }
      ]
    }
  ]
}
Same file

What else settings.json configures

This page is one entry in a file that holds 4. Installing the file brings all of them; each is measured and scanned on its own page.

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. 9d ago First seen · 13 lines scan C cda409b33d47

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository martinholovsky/claude-skills-generator (45 stars, last pushed 9mo ago), licensed Unlicense. Its token cost is not measured: a hook is shell that never enters the context. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.