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.

Use it to configure pre-action checks for shell commands and file-writing or editing operations in an agent workflow.

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.

PreToolUse — Hook by LilithGames

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/lilithgames/a2wave/pre-tool-use

Clone the repo

git clone --depth 1 https://github.com/LilithGames/a2wave

Made for: Claude Code.

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 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 2d 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"
        }
      ]
    }
  ]
}

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.

2d 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 (24 stars, last pushed 4d 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.

Data and AI Productivity Writing and docs agent agent-orchestration ai-agents claude-code cursor developer-tools

PreToolUse

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

Other hooks, from other repositories

SessionStart

TaskCreated

WorktreeRemove

PostToolUse

Stop

PostToolUse