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PreToolUse

PreToolUse is a hook for Claude Code from and3r817/dot-claude-plugins. Its token cost is not measured, scanned A, original, MIT.

A safety hook that runs before Bash commands and blocks GitHub command-line write operations. Bash is a tool for running shell commands, while GitHub is used for hosted code, reviews, issues, and workflows.

In plain words
What is it for?
Use it to guard repository, pull-request, issue, API, and workflow changes made through the GitHub command-line tool.
Why use it?
It prevents accidental remote changes such as creating, merging, deleting, or updating GitHub resources while still allowing read-only checks.

Hook for Claude Code

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable.

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 github-cli plugin — 1 skill, 1 command, 1 hook shipped together

not rated 2 8mo ago A scan tokens not measured original MIT
View the source file and3r817/dot-claude-plugins
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 and3r817/dot-claude-plugins
Claude Code
/plugin install github-cli

Made for: Claude Code.

Or install github-cli, the plugin that ships this one along with the rest of its 1 skill, 1 command, 1 hook.

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/and3r817/dot-claude-plugins/pre-tool-use.svg)](https://agentmods.dev/hooks/and3r817/dot-claude-plugins/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/and3r817/dot-claude-plugins/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/and3r817/dot-claude-plugins/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 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 5d 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.

github-cli/hooks/hooks.json · 15 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/scripts/gh_write_blocker.py",
          "timeout": 1,
          "description": "Blocks GitHub CLI write operations while allowing read-only commands"
        }
      ]
    }
  ]
}
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. 5d ago First seen · 15 lines scan A e3dfc76e22dc

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository and3r817/dot-claude-plugins (2 stars, last pushed 8mo ago), 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. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Git and workflowSecurityclaude-codeclaude-code-hooksclaude-code-marketplaceclaude-code-pluginsclaude-code-skills
Related

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PreToolUse

Runs before the agent uses a tool for Read, Edit, Write, Read, Grep, Task and Edit tool calls, executing pre-tool-use-broadcast.mjs, path-rules.mjs, tldr-read-enforcer.mjs, smart-search-router.mjs, tldr-context-inject.mjs, arch-context-inject.mjs, file-claims.mjs, edit-context-inject.mjs and signature-helper.mjs via…

parcadei/Continuous-Claude-v3 · not measured

PostToolUse

Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.

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SessionStart

Runs when a session starts, executing on-start.js via node. From google-gemini/gemini-cli.

google-gemini/gemini-cli · not measured

SessionStart

Runs when a session starts on startup, executing install_pkgs.sh. From supabase/supabase.

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PreToolUse

Runs before the agent uses a tool for Bash tool calls, running an inline shell check. From apache/superset.

apache/superset · not measured

PreToolUse

Runs before the agent uses a tool, executing pre-write.sh and pre-bash.sh (2 commands). From anthropics/claude-cookbooks.

anthropics/claude-cookbooks · not measured