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vergil-claude-plugin: Hook for Claude Code

.claude/settings.json

PreToolUse is a hook for Claude Code from vergil-project/vergil-claude-plugin. Its token cost is not measured, scanned A, a copy of SessionStart, MIT.

A command hook that runs guard.sh before the agent uses Bash, the tool for running shell commands.

In plain words
What is it for?
Use it to apply project-specific checks to every Bash call made by the agent.
Why use it?
It provides a checkpoint before shell commands run, allowing the guard script to inspect or block them.

Hook for Claude Code

Written for Claude Code: ${CLAUDE_PROJECT_DIR} variable.

This is vergil-project/vergil-claude-plugin's own configuration. It tells Claude Code how to work on vergil-claude-plugin 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 vergil-claude-plugin configures →

Part of the vergil plugin — 15 skills, 1 agent, 2 hooks shipped together

One of 2 entries in settings.json upstream. Installing this one merges just its entry into your config; the other 1 are separate, each on its own page.

not rated 2repo 5d ago A scan tokens not measured copy · 44% MIT
View source ↗ vergil-project/vergil-claude-plugin vergil-project.github.io
Reuse

Borrowing it

Nothing to install: this file belongs to vergil-project/vergil-claude-plugin. 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/vergil-project/vergil-claude-plugin/develop/.claude/settings.json
Clone the repo
git clone --depth 1 https://github.com/vergil-project/vergil-claude-plugin

Made for: Claude Code.

Or install vergil, the plugin that ships this one along with the rest of its 15 skills, 1 agent, 2 hooks.

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/vergil-project/vergil-claude-plugin/pre-tool-use.svg)](https://agentmods.dev/hooks/vergil-project/vergil-claude-plugin/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/vergil-project/vergil-claude-plugin/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/vergil-project/vergil-claude-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. A grade says what 26 rules found in the file — not that it is safe.
Origin 44% 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 7d 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

44% 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.

.claude/settings.json · 13 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PROJECT_DIR}/.claude/hooks/guard.sh"
        }
      ]
    }
  ]
}
Same file

What else settings.json configures

This page is one entry in a file that holds 2. 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. 7d ago First seen · 13 lines scan A 4e1093ef25ac

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository vergil-project/vergil-claude-plugin (2 stars, last pushed 5d 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 44% identical to SessionStart, differing in 8 lines, and is treated as a copy.

Related

Other hooks, from other repositories

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 on startup, executing install_pkgs.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

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

PreCompact

Runs before the context is compacted for manual and auto tool calls, executing hook-handler.cjs via node (4 commands). From ruvnet/RuView.

ruvnet/RuView · not measured