agent-glovebox: Hook for Claude Code

.claude/settings.json

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

A pre-tool-use hook configuration that runs safety, monitoring and validation scripts before an agent uses tools such as shell commands, file edits, web requests and Git operations.

In plain words
What is it for?
Use it to inspect or validate tool calls, monitor command launches, check web-fetch requests, and provide advisory checks around Claude, Git and GitHub commands.
Why use it?
It adds checks before potentially sensitive actions, helping detect unsafe inputs and advise on authentication or web-request handling.

Hook for Claude Code

Written for Claude Code: ${CLAUDE_PROJECT_DIR variable. Also seen: names the NotebookEdit tool.

This is AlexanderMattTurner/agent-glovebox's own configuration. It tells Claude Code how to work on agent-glovebox 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 agent-glovebox configures →

One of 9 entries in settings.json upstream. Installing this one merges just its entry into your config; the other 8 are separate, each on its own page.

Reuse

Borrowing it

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

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/alexandermattturner/agent-glovebox/pre-tool-use/github.svg)](https://agentmods.dev/hooks/alexandermattturner/agent-glovebox/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/alexandermattturner/agent-glovebox/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/alexandermattturner/agent-glovebox/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/alexandermattturner/agent-glovebox/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/alexandermattturner/agent-glovebox/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 yesterday.

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 · 58 lines

How it starts

The opening of the file, as written. The whole thing — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.

{
  "PreToolUse": [
    {
      "matcher": "Skill|Read|Edit|Write|MultiEdit|NotebookEdit|mcp__.*",
      "hooks": [
        {
          "type": "command",
          "command": "if [ -d \"${CLAUDE_PROJECT_DIR:-}\" ]; then _gb_launcher=\"$CLAUDE_PROJECT_DIR\"/.claude/.hookpin-\"${CLAUDE_CODE_SESSION_ID:-}\"/safe-launch.sh; [ -x \"$_gb_launcher\" ] || _gb_launcher=\"$CLAUDE_PROJECT_DIR\"/.claude/hooks/safe-launch.sh; \"$_gb_launcher\" --advisory \"$CLAUDE_PROJECT_DIR\"/.claude/hooks/gate-skills.mjs; fi",
          "timeout": 1800
        }
      ]
    },
    {
      "matcher": "",
      "hooks": [
        {
          "type": "command",
          "command": "if [ -n \"${GLOVEBOX_EXPERIMENTAL_MONITOR:-}\" ]; then _gb_launcher=\"$CLAUDE_PROJECT_DIR\"/.claude/.hookpin-\"${CLAUDE_CODE_SESSION_ID:-}\"/safe-launch.sh; [ -x \"$_gb_launcher\" ] || _gb_launcher=\"$CLAUDE_PROJECT_DIR\"/.claude/hooks/safe-launch.sh; _GLOVEBOX_HOOK_DEADLINE=1795 \"$_gb_launcher\" \"$CLAUDE_PROJECT_DIR\"/.claude/hooks/monitor-launch.bash; fi",
          "timeout": 1800,
          "onFailure": "block"
        }
      ]
    },
    {
      "matcher": "WebFetch",
      "hooks": [
        {
          "type": "command",
          "command": "_gb_launcher=\"$CLAUDE_PROJECT_DIR\"/.claude/.hookpin-\"${CLAUDE_CODE_SESSION_ID:-}\"/safe-launch.sh; [ -x \"$_gb_launcher\" ] || _gb_launcher=\"$CLAUDE_PROJECT_DIR\"/.claude/hooks/safe-launch.sh; _GLOVEBOX_HOOK_DEADLINE=1795 \"$_gb_launcher\" \"$CLAUDE_PROJECT_DIR\"/.claude/hooks/validate-webfetch.bundle.mjs",
          "timeout": 1800,
          "onFailure": "block"
        }
      ]
    },
    {
      "matcher": "Bash|mcp__github__.*|mcp__github_remote__.*",
      "hooks": [
        {
          "type": "command",
          "command": "_gb_launcher=\"$CLAUDE_PROJECT_DIR\"/.claude/.hookpin-\"${CLAUDE_CODE_SESSION_ID:-}\"/safe-launch.sh; [ -x \"$_gb_launcher\" ] || _gb_launcher=\"$CLAUDE_PROJECT_DIR\"/.claude/hooks/safe-launch.sh; _GLOVEBOX_HOOK_DEADLINE=1795 \"$_gb_l

Read the full file on GitHub · 58 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. yesterday Changed b0a8588582b5
  2. 4d ago Changed · +4 lines 9b2ce7ec5b80
  3. 14d ago Changed · -10 lines 7b1e77bc8847
  4. 15d ago Changed f9b41d2a6bfa
  5. 1mo ago Changed a68997731828
  6. 1mo ago Changed 1e9f0872f364
  7. 1mo ago Changed 907fea9ec051
  8. 1mo ago Changed 5b5a8e6d3c5f
  9. 1mo ago Changed a2e17bdc6eb2
  10. 1mo ago First seen · 64 lines scan A 3be5993240d5

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository AlexanderMattTurner/agent-glovebox (68 stars, last pushed today), 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.