PreToolUse

PreToolUse is a hook for Claude Code from WingedGuardian/GENesis-AGI. Its token cost is not measured, scanned A, a copy of SessionStart, MIT.

A set of automatic actions that runs before the coding agent uses tools such as reading files, running commands, editing files, searching the web, or managing worktrees.

In plain words
What is it for?
Use it to enforce procedures, control discovery and background processes, and inspect tool calls before execution.
Why use it?
It can apply project checks and block unsafe or disallowed operations before they happen.

Hook for Claude Code

Written for Claude Code: ${CLAUDE_PROJECT_DIR} variable.

One of 9 entries in settings.json — they are configured in one file and arrive together.

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/wingedguardian/genesis-agi/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/WingedGuardian/GENesis-AGI

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/wingedguardian/genesis-agi/pre-tool-use.svg)](https://agentmods.dev/hooks/wingedguardian/genesis-agi/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/wingedguardian/genesis-agi/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/wingedguardian/genesis-agi/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 42% 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 6d 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

42% identical to SessionStart — 215 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.

.claude/settings.json · 220 lines

How it starts

The opening of the file, as written. The whole thing — 220 lines — stays where its author put it; the contents beside it link to each section on GitHub.

{
  "PreToolUse": [
    {
      "matcher": ".*",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PROJECT_DIR}/.claude/hooks/genesis-hook procedure_advisor.py",
          "timeout": 10
        }
      ]
    },
    {
      "matcher": "Read|Grep|Glob",
      "hooks": [
        {
          "type": "command",
          "command": "bash ${CLAUDE_PROJECT_DIR}/.claude/hooks/cbm-discovery-gate.sh",
          "timeout": 10
        }
      ]
    },
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "bash -c 'IN=$(cat); CMD=$(printf %s \"$IN\" | jq -r .tool_input.command 2>/dev/null); if echo \"$CMD\" | grep -qE \"genesis[[:space:]]+serve\" && echo \"$CMD\" | grep -qi \"worktree\"; then echo \"BLOCKED: never boot the full Genesis runtime from/against a worktree.\" >&2; echo \"Children inherit PYTHONPATH and path-keyed subsystems reindex the worktree as a new project — OOM-crashed the container 2026-07-03.\" >&2; echo \"PYTHONPATH to a worktree is for pytest only. Use merge-then-verify or a blueprint-only harness.\" >&2; exit 2; fi; if echo \"$CMD\" | grep -qE \"pip install.*((-e|--editable) +[^ ]*worktree)\"; then echo \"BLOCKED: pip install -e to a worktree redirects the ENTIRE system genesis imports.\" >&2; echo \"This crashes the live bridge. Use PYTHONPATH instead:\" >&2; echo \"  PYTHONPATH=/path/to/worktree/src pytest tests/\" >&2; exit 2; fi; case \"$CMD\" in *\"git reset --hard\"*) echo \"BLOCKED: git reset --hard destroys uncommitted work. Use git stash or ask the user.\" >&2; exit 2;; *\"nohup\"*\"run_ui\"*|*\"nohup\"*\"bridge\"*|*\"nohup\"*\"genesis\"*) echo \"BLOCKED: AZ and bridge must run via systemd, not nohup.\" >&2; echo \"Use: systemctl --user restart genesis-az\" >&2; echo \"  or: systemctl --user restart genesis-bridge\" >&2; exit 2;; esac; if echo \"$CMD\" | grep -qE \"sqlite3.*genesis\\.db\"; then echo \"WARNING: Direct sqlite3 access to genesis.db detected. Use

Read the full file on GitHub · 220 lines

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. 6d ago First seen · 220 lines scan A 9091f36fe024

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository WingedGuardian/GENesis-AGI (93 stars, last pushed today), 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 42% identical to SessionStart, differing in 215 lines, and is treated as a copy.