a2wave: Hook for Claude Code

.claude/settings.json

PreToolUse is a hook for Claude Code from LilithGames/a2wave. Its token cost is not measured, scanned A, original, Apache-2.0.

A pre-tool hook configuration that runs a guard script before an agent uses Bash, Write, or Edit actions. It is intended to check those actions before they proceed.

In plain words
What is it for?
Use it to configure pre-action checks for shell commands and file-writing or editing operations in an agent workflow.
Why use it?
It adds an automatic check before commands or file changes are made. The provided input does not describe what the guard script checks or blocks.

Hook for Claude Code

Written for Claude Code: PreToolUse hook event. Also seen: reads .claude/ paths.

This is LilithGames/a2wave's own configuration. It tells Claude Code how to work on a2wave 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 a2wave configures →

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.

Reuse

Borrowing it

Nothing to install: this file belongs to LilithGames/a2wave. 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/LilithGames/a2wave/main/.claude/settings.json
Clone the repo
git clone --depth 1 https://github.com/LilithGames/a2wave

Made for: Claude Code.

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/lilithgames/a2wave/pre-tool-use/github.svg)](https://agentmods.dev/hooks/lilithgames/a2wave/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/lilithgames/a2wave/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/lilithgames/a2wave/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/lilithgames/a2wave/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/lilithgames/a2wave/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 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 1mo 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.

.claude/settings.json · 31 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": ".claude/hooks/pre-tool-guard.sh"
        }
      ]
    },
    {
      "matcher": "Write",
      "hooks": [
        {
          "type": "command",
          "command": ".claude/hooks/pre-tool-guard.sh"
        }
      ]
    },
    {
      "matcher": "Edit",
      "hooks": [
        {
          "type": "command",
          "command": ".claude/hooks/pre-tool-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. 1mo ago First seen · 31 lines scan A 34e35e3440c4

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository LilithGames/a2wave (27 stars, last pushed 2d ago), licensed Apache-2.0. 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 2026-08-30.