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PreToolUse

PreToolUse is a hook for coding agents from azmym/gemini-plugin. Its token cost is not measured, scanned A, original, MIT.

Safety hooks that run before shell commands and before finishing a planned task.

In plain words
What is it for?
Use them to apply pre-command safety checks and verify that required plan-completion steps have run.
Why use it?
They provide a checkpoint for potentially destructive shell actions and for declaring a plan complete.

Hook

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 gemini-plugin plugin — 9 skills, 6 commands, 5 agents, 7 hooks shipped together

One of 7 entries in hooks.json — they are configured in one file and arrive together.

not rated 1 20d ago A scan tokens not measured original MIT
View the source file azmym/gemini-plugin
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 azmym/gemini-plugin
Claude Code
/plugin install gemini-plugin

Or install gemini-plugin, the plugin that ships this one along with the rest of its 9 skills, 6 commands, 5 agents, 7 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/azmym/gemini-plugin/pre-tool-use.svg)](https://agentmods.dev/hooks/azmym/gemini-plugin/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/azmym/gemini-plugin/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/azmym/gemini-plugin/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 3d 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 · 24 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/hooks/pre-destructive-bash.sh",
          "async": false
        }
      ]
    },
    {
      "matcher": "ExitPlanMode",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/hooks/plan-complete.sh",
          "async": false
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 7. 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. 3d ago First seen · 24 lines scan A d4fb1c17cdfe

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository azmym/gemini-plugin (1 stars, last pushed 20d 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.

Securityai-assistantanti-hallucinationclaude-codeclaude-code-plugindeveloper-toolsgemini
Related

Other hooks, from other repositories

PreToolUse

Runs before the agent uses a tool for Read, Edit and Write tool calls, executing block_secrets.py via python3. From winstonkoh87/Athena-Public.

winstonkoh87/Athena-Public · not measured

SessionStart

Runs when a session starts, executing check_env.py via python. From Ibrahim-3d/nano-banana-claude-plugin.

Ibrahim-3d/nano-banana-claude-plugin · not measured

SessionStart

Runs when a session starts, executing session-lifecycle-hook.mjs via node. From markbrutx/gemini-plugin-cc.

markbrutx/gemini-plugin-cc · not measured

Stop

Runs when the agent finishes a response, executing stop-review-gate-hook.mjs via node. From markbrutx/gemini-plugin-cc.

markbrutx/gemini-plugin-cc · not measured

PreToolUse

Runs before the agent uses a tool for ExitPlanMode, Task and Write tool calls, executing plan-peer-review-check.sh, task-peer-review-check.sh and write-peer-review-check.sh via bash (3 commands). From slb350/gemini-peer-review.

slb350/gemini-peer-review · not measured

UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, executing user-prompt-check.sh via bash. From slb350/gemini-peer-review.

slb350/gemini-peer-review · not measured