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PreToolUse

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

A pre-action check that runs a governance script before the coding agent writes files, edits notebooks, or runs shell commands. If the check cannot run, it asks for permission before continuing.

In plain words
What is it for?
Use it to enforce approval or rule checks around file changes and terminal commands made by an agent.
Why use it?
It adds a pause before changes or commands can happen, so project rules can be checked instead of silently bypassed.

Hook for Claude Code

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable. Also seen: names the NotebookEdit tool; mentions Claude Code.

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 govern-my-chatbot plugin — 1 skill, 4 hooks shipped together

One of 4 entries in hooks.json upstream. Installing this one merges just its entry into your config; the other 3 are separate, each on its own page.

not rated 2repo 5d ago A scan tokens not measured original Apache-2.0

Good fit Use it to enforce approval or rule checks around file changes and terminal commands made by an agent.

Compare 6 hooks from other repositories ↓
View source ↗ NeuroverseOS/Neuroverseos-governance neuroverseos.com
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 NeuroverseOS/Neuroverseos-governance
Claude Code
/plugin install govern-my-chatbot

Made for: Claude Code.

Or install govern-my-chatbot, the plugin that ships this one along with the rest of its 1 skill, 4 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/neuroverseos/neuroverseos-governance/pre-tool-use/github.svg)](https://agentmods.dev/hooks/neuroverseos/neuroverseos-governance/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/neuroverseos/neuroverseos-governance/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/neuroverseos/neuroverseos-governance/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/neuroverseos/neuroverseos-governance/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/neuroverseos/neuroverseos-governance/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 19d 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.

hooks/hooks.json · 22 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Write|Edit|MultiEdit|NotebookEdit",
      "hooks": [
        {
          "type": "command",
          "command": "node \"${CLAUDE_PLUGIN_ROOT}/skills/govern-my-chatbot/hooks/rulebook-guard.mjs\" pre || printf '%s\\n' '{\"hookSpecificOutput\":{\"hookEventName\":\"PreToolUse\",\"permissionDecision\":\"ask\",\"permissionDecisionReason\":\"The rulebook guard could not run (is Node.js installed?), so Claude Code is asking before this change.\"}}'"
        }
      ]
    },
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "node \"${CLAUDE_PLUGIN_ROOT}/skills/govern-my-chatbot/hooks/rulebook-guard.mjs\" pre-bash || printf '%s\\n' '{\"hookSpecificOutput\":{\"hookEventName\":\"PreToolUse\",\"permissionDecision\":\"ask\",\"permissionDecisionReason\":\"The rulebook guard could not run (is Node.js installed?), so Claude Code is asking before this command.\"}}'"
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 4. 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. 19d ago First seen · 22 lines scan A f8001a27968b

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository NeuroverseOS/Neuroverseos-governance (2 stars, last pushed 5d 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 2026-09-29.

AI SafetyBuilding agentsSecurityagent-frameworkaiai-agentsai-governanceai-guardrails
Related

Other hooks, from other repositories

PreToolUse

Runs before the agent uses a tool for Bash, Monitor, PowerShell, Write, Edit, MultiEdit, NotebookEdit, Read, CronCreate and ^mcp__ tool calls, executing run-check.sh (7 commands). From QORIS-AI/knox.

QORIS-AI/knox · not measured

ConfigChange

Runs on the ConfigChange event for user_settings, project_settings and local_settings tool calls, running an inline shell check. From QORIS-AI/knox.

QORIS-AI/knox · not measured

InstructionsLoaded

Runs after instructions files are loaded for session_start, include, path_glob_match, nested_traversal and compact tool calls, running an inline shell check. From QORIS-AI/knox.

QORIS-AI/knox · not measured

FileChanged

Runs on the FileChanged event for .knox.json and .knox.local.json tool calls, running an inline shell check. From QORIS-AI/knox.

QORIS-AI/knox · not measured

SessionStart

Runs when a session starts on startup, resume, clear and compact, running an inline shell check. From QORIS-AI/knox.

QORIS-AI/knox · not measured

PostToolUse

Runs after a tool call finishes, running an inline shell check. From QORIS-AI/knox.

QORIS-AI/knox · not measured