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PreToolUse

PreToolUse is a hook for Claude Code from zhmxiaowo/opencode-simple. Its token cost is not measured, scanned A, a copy of Stop, MIT.

A set of automatic checks that run before the coding agent uses selected tools, such as Bash, Write, Edit, or MultiEdit. The checks are run by small Node.js scripts and shell scripts.

In plain words
What is it for?
Use it to start development servers in tmux, show reminders before shell commands and Git pushes, and run checks before changing files.
Why use it?
It can remind the agent about practices such as using tmux for long-running commands, reviewing changes before pushing to Git, and following other configured checks. The exact behavior depends on the included hook scripts.

Hook for Claude Code

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable.

Runs only inside a plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else, and the catalogue could not identify which plugin ships it.

One of 6 entries in hooks.json upstream. Installing this one merges just its entry into your config; the other 5 are separate, each on its own page.

not rated 2repo 7mo ago A scan tokens not measured copy · 77% MIT

Good fit Use it to start development servers in tmux, show reminders before shell commands and Git pushes, and run checks before changing files.

Compare 6 hooks from other repositories ↓
View source ↗ zhmxiaowo/opencode-simple
Install

Getting it into your agent

There is no command for this one: it runs only inside a plugin, and the catalogue could not identify which plugin ships it. The source is linked below.

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/zhmxiaowo/opencode-simple/pre-tool-use/github.svg)](https://agentmods.dev/hooks/zhmxiaowo/opencode-simple/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/zhmxiaowo/opencode-simple/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/zhmxiaowo/opencode-simple/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/zhmxiaowo/opencode-simple/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/zhmxiaowo/opencode-simple/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 77% 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 1mo 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

77% identical to Stop — 65 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.

hooks/hooks.json · 77 lines

How it starts

The opening of the file, as written. The whole thing — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.

{
  "PreToolUse": [
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "node \"${CLAUDE_PLUGIN_ROOT}/scripts/hooks/auto-tmux-dev.js\""
        }
      ],
      "description": "Auto-start dev servers in tmux with directory-based session names"
    },
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "node \"${CLAUDE_PLUGIN_ROOT}/scripts/hooks/run-with-flags.js\" \"pre:bash:tmux-reminder\" \"scripts/hooks/pre-bash-tmux-reminder.js\" \"strict\""
        }
      ],
      "description": "Reminder to use tmux for long-running commands"
    },
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "node \"${CLAUDE_PLUGIN_ROOT}/scripts/hooks/run-with-flags.js\" \"pre:bash:git-push-reminder\" \"scripts/hooks/pre-bash-git-push-reminder.js\" \"strict\""
        }
      ],
      "description": "Reminder before git push to review changes"
    },
    {
      "matcher": "Write",
      "hooks": [
        {
          "type": "command",
          "command": "node \"${CLAUDE_PLUGIN_ROOT}/scripts/hooks/run-with-flags.js\" \"pre:write:doc-file-warning\" \"scripts/hooks/doc-file-warning.js\" \"standard,strict\""
        }
      ],
      "description": "Doc file warning: warn about non-standard documentation files (exit code 0; warns only)"
    },
    {
      "matcher": "Edit|Write",
      "hooks": [
        {
          "type": "command",
          "command": "node \"${CLAUDE_PLUGIN_ROOT}/scripts/hooks/run-with-flags.js\" \"pre:edit-write:suggest-compact\" \"scripts/hooks/suggest-compact.js\" \"standard,strict\""
        }
      ],
      "description": "Suggest manual compaction at logical intervals"
    },
    {
      "matcher": "*",
      "hooks": [
        {
          "type": "command",
          "command": "bash \"${CLAUDE_PLUGIN_ROOT}/scripts/hooks/run-with-flags-shell.sh\" \"pre:observe\" \"skills/continuous-learning-

Read the full file on GitHub · 77 lines

Same file

What else hooks.json configures

This page is one entry in a file that holds 6. 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. 1mo ago First seen · 77 lines scan A 1d9046ffa8c4

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository zhmxiaowo/opencode-simple (2 stars, last pushed 7mo 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. It is 77% identical to Stop, differing in 65 lines, and is treated as a copy.

Related

Other hooks, from other repositories

PostToolUse

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

supabase/supabase · not measured

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.

supabase/supabase · not measured

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

SessionStart

Runs when a session starts, executing session-start.sh. From anthropics/claude-cookbooks.

anthropics/claude-cookbooks · not measured