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PreToolUse

PreToolUse is a hook for Claude Code from HawkannG/Claude-Warden. Its token cost is not measured, scanned A, original, MIT.

Checks that run before Claude Code writes files or executes shell commands, using Warden guard scripts.

In plain words
What is it for?
Guarding file changes and Bash commands made through Write, Edit, notebook-editing, and shell tools.
Why use it?
They can inspect actions before they happen and help prevent unsafe edits or commands.

Hook for Claude Code

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable. Also seen: names the NotebookEdit tool.

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 claude-warden plugin — 7 skills, 4 hooks shipped together

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

not rated 2repo 6mo ago A scan tokens not measured original MIT

Good fit Guarding file changes and Bash commands made through Write, Edit, notebook-editing, and shell tools.

Compare 6 hooks from other repositories ↓
View source ↗ HawkannG/Claude-Warden
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 HawkannG/Claude-Warden
Claude Code
/plugin install claude-warden

Made for: Claude Code.

Or install claude-warden, the plugin that ships this one along with the rest of its 7 skills, 4 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/hawkanng/claude-warden/pre-tool-use.svg)](https://agentmods.dev/hooks/hawkanng/claude-warden/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/hawkanng/claude-warden/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/hawkanng/claude-warden/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 original No closer match found 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.

hooks/hooks.json · 24 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Write|Edit|MultiEdit|NotebookEdit",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/scripts/warden-guard.sh",
          "timeout": 30
        }
      ]
    },
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/scripts/warden-bash-guard.sh",
          "timeout": 15
        }
      ]
    }
  ]
}
Same file

What else hooks.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. 7d ago First seen · 24 lines scan A 4c13ae304366

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository HawkannG/Claude-Warden (2 stars, last pushed 6mo 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. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Securityai-governanceai-governance-modelaigovernanceclaude-aivibevibe-coding
Related

Other hooks, from other repositories

PreToolUse

Runs before the agent uses a tool for Bash, shell_command, exec_command, unified_exec, apply_patch, Write and Edit tool calls, executing pre-tool-adapter.py via python3 (2 commands). From arbiterForge/codeArbiter.

arbiterForge/codeArbiter · not measured

PostToolUse

Runs after a tool call finishes, running vibird hook PostToolUse. From Hakureirm/vibird.

Hakureirm/vibird · not measured

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