agentmods.dev

PreToolUse

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

A set of checks that runs before an AI coding agent uses selected tools or reads, writes, or edits files.

In plain words
What is it for?
It is for adding safety checks before terminal commands, file access, and file changes.
Why use it?
It can inspect tool actions in advance and stop unsafe commands, environment-file reads, changes to the agent setup, or writes outside allowed paths.

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 supercharger plugin — 37 commands, 10 agents, 28 hooks shipped together

One of 28 entries in hooks.json upstream. Installing this one merges just its entry into your config; the other 27 are separate, each on its own page.

not rated 11repo changed 4d ago A scan tokens not measured copy · 67% MIT

Good fit It is for adding safety checks before terminal commands, file access, and file changes.

Compare 6 hooks from other repositories ↓
View source ↗ smrafiz/claude-supercharger
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 smrafiz/claude-supercharger
Claude Code
/plugin install supercharger

Made for: Claude Code.

Or install supercharger, the plugin that ships this one along with the rest of its 37 commands, 10 agents, 28 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/smrafiz/claude-supercharger/pre-tool-use/github.svg)](https://agentmods.dev/hooks/smrafiz/claude-supercharger/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/smrafiz/claude-supercharger/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/smrafiz/claude-supercharger/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/smrafiz/claude-supercharger/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/smrafiz/claude-supercharger/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 A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 — 570 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.

hooks/hooks.json · 575 lines

How it starts

The opening of the file, as written. The whole thing — 575 lines — stays where its author put it; the contents beside it link to each section on GitHub.

{
  "PreToolUse": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "\"${CLAUDE_PLUGIN_ROOT}\"/hooks/safety.sh",
          "timeout": 15
        }
      ],
      "matcher": "Bash|Monitor|PowerShell|mcp__desktop-commander__.*|mcp__mcp-server-commands__.*|mcp__iterm__.*|mcp__iterm-mcp__.*|mcp__ssh__.*|mcp__shell__.*|mcp__terminal__.*|mcp__windows-cli__.*|mcp__cli-mcp-server__.*"
    },
    {
      "hooks": [
        {
          "type": "command",
          "command": "\"${CLAUDE_PLUGIN_ROOT}\"/hooks/env-file-guard.sh",
          "timeout": 15
        }
      ],
      "matcher": "Read|ReadMcpResourceTool|ReadMcpResourceDirTool"
    },
    {
      "hooks": [
        {
          "type": "command",
          "command": "\"${CLAUDE_PLUGIN_ROOT}\"/hooks/harness-tamper-guard.sh",
          "timeout": 15
        }
      ],
      "matcher": "Bash|Monitor|PowerShell"
    },
    {
      "hooks": [
        {
          "type": "command",
          "command": "\"${CLAUDE_PLUGIN_ROOT}\"/hooks/path-guard.sh",
          "timeout": 15
        }
      ],
      "matcher": "Write|Edit|MultiEdit|NotebookEdit"
    },
    {
      "hooks": [
        {
          "type": "command",
          "command": "\"${CLAUDE_PLUGIN_ROOT}\"/hooks/critical-infra-guard.sh",
          "timeout": 15
        }
      ],
      "matcher": "Write|Edit|MultiEdit|NotebookEdit"
    },
    {
      "hooks": [
        {
          "type": "command",
          "command": "\"${CLAUDE_PLUGIN_ROOT}\"/hooks/readonly-guard.sh",
          "timeout": 15
        }
      ],
      "matcher": "Write|Edit|MultiEdit|NotebookEdit|Bash|Monitor|PowerShell"
    },
    {
      "hooks": [
        {
          "type": "command",
          "command": "\"${CLAUDE_PLUGIN_ROOT}\"/hooks/memory-write-guard.sh",
          "timeout": 15
        }
      ],
      "matcher": "Write|Edit|MultiEdit"
    },
    {
      "hooks": [
        {
          "type": "command",
          "command": "\"${CLAUDE_PLUGIN_ROOT}\"/hooks/t

Read the full file on GitHub · 575 lines

Same file

What else hooks.json configures

This page is one entry in a file that holds 28. 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. 4d ago Changed · +10 lines eb614f6f2760
  2. 5d ago Changed · +30 lines cadae7a1386b
  3. 9d ago First seen · 535 lines scan A 188cb8e3966d

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository smrafiz/claude-supercharger (11 stars, last pushed yesterday), 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 570 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

PostToolUse

Runs after a tool call finishes for Write and Edit tool calls, executing format-ts.mjs via node. From prisma/orm.

prisma/orm · not measured