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PreToolUse

PreToolUse is a hook for coding agents from joey-barbier/ClaudeCode-Plugin. Its token cost is not measured, scanned A, a copy of SessionStart, MIT.

A pre-tool hook that runs a git-safety script before Bash commands are executed. Git is a version-control system used to track code changes.

In plain words
What is it for?
Use it in a Claude Code plugin configuration to run git-safety.sh before Bash tool calls.
Why use it?
It adds an automatic safety check before shell commands that may affect a Git repository. The provided configuration does not explain what specific checks the script performs.

Hook

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the horka-dev-workflow plugin — 2 skills, 1 agent, 1 hook shipped together

not rated 22 2mo ago A scan tokens not measured copy · 67% MIT
View the source file joey-barbier/ClaudeCode-Plugin
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add joey-barbier/ClaudeCode-Plugin
Claude Code
/plugin install horka-dev-workflow

Or install horka-dev-workflow, the plugin that ships this one along with the rest of its 2 skills, 1 agent, 1 hook.

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/joey-barbier/claudecode-plugin/pre-tool-use.svg)](https://agentmods.dev/hooks/joey-barbier/claudecode-plugin/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/joey-barbier/claudecode-plugin/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/joey-barbier/claudecode-plugin/pre-tool-use.svg" alt="Measured on agentmods" 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 A 0 findings. Scan, not verified.
Origin 67% copy Near-identical to another mod in the catalogue.
Security

Grade A, and why

PreToolUse scanned grade A with 0 findings 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 4d 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

67% identical to SessionStart — 8 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.

plugins/horka-dev-workflow/hooks/hooks.json · 13 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/scripts/git-safety.sh"
        }
      ]
    }
  ]
}
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. 4d ago First seen · 13 lines scan A ed6984b0f8ed

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository joey-barbier/ClaudeCode-Plugin (22 stars, last pushed 2mo ago), licensed MIT. Its token cost is not measured: a hook is shell that never enters the context. A static security scan graded it A with 0 findings. It is 67% identical to SessionStart, differing in 8 lines, and is treated as a copy.

Related

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PostToolUse

Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.

supabase/supabase · not measured

SessionStart

Runs when a session starts, executing on-start.js via node. From google-gemini/gemini-cli.

google-gemini/gemini-cli · not measured

SessionStart

Runs when a session starts on startup, executing install_pkgs.sh. From supabase/supabase.

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PreToolUse

Runs before the agent uses a tool for Bash tool calls, running an inline shell check. From apache/superset.

apache/superset · not measured

PreToolUse

Runs before the agent uses a tool, executing pre-write.sh and pre-bash.sh (2 commands). From anthropics/claude-cookbooks.

anthropics/claude-cookbooks · not measured

SessionStart

Runs when a session starts, executing session-start.sh. From anthropics/claude-cookbooks.

anthropics/claude-cookbooks · not measured