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PreToolUse

PreToolUse is a hook for Claude Code from tajmahal226/compound-engineering-plugin. Its token cost is not measured, scanned A, a copy of PreToolUse, MIT.

A pre-tool hook that runs a shell command before the agent uses the Read tool.

In plain words
What is it for?
Running a command before each Read operation, such as printing a default message or adding a pre-read check.
Why use it?
It provides a place to check or prepare something before files are read.

Hook for Claude Code

Written for Claude Code: PreToolUse hook event.

Part of the custom-paths plugin — 2 skills, 1 command, 1 agent, 1 hook shipped together

not rated 4 6mo ago A scan tokens not measured copy · 100% MIT
View the source file tajmahal226/compound-engineering-plugin every.to
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add hooks/tajmahal226/compound-engineering-plugin/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/tajmahal226/compound-engineering-plugin

Made for: Claude Code.

Or install custom-paths, the plugin that ships this one along with the rest of its 2 skills, 1 command, 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/tajmahal226/compound-engineering-plugin/pre-tool-use.svg)](https://agentmods.dev/hooks/tajmahal226/compound-engineering-plugin/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/tajmahal226/compound-engineering-plugin/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/tajmahal226/compound-engineering-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 100% 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 5d 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

100% identical to PreToolUse — 0 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.

tests/fixtures/custom-paths/hooks/hooks.json · 13 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Read",
      "hooks": [
        {
          "type": "command",
          "command": "echo default"
        }
      ]
    }
  ]
}
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. 5d ago First seen · 13 lines scan A ede7f03dcdad

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository tajmahal226/compound-engineering-plugin (4 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. It is 100% identical to PreToolUse, differing in 0 lines, and is treated as a copy.

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