PreToolUse

PreToolUse is a hook for Claude Code from cfrs2005/claude-init. Its token cost is not measured, scanned A, a copy of SessionStart, MIT.

A pair of pre-tool-use hooks that inspect shell commands before they run. One blocks development servers started outside tmux, a terminal session manager, and the other advises using tmux for longer commands.

In plain words
What is it for?
Use it to enforce tmux for development servers and show reminders before commands such as tests, builds, package installation, Docker, and browser tests.
Why use it?
It helps keep development-server logs and long-running processes available after the command is started. It also warns when commands may not persist reliably.

Hook for Claude Code

Written for Claude Code: PreToolUse hook event. Also seen: reads .claude/ paths.

One of 5 entries in hooks.json upstream. Installing this one merges just its entry into your config; the other 4 are separate, each on its own page.

Good fit Use it to enforce tmux for development servers and show reminders before commands such as tests, builds, package installation, Docker, and browser tests.

Compare 6 hooks from other repositories ↓
Install with agentmods
npx agentmods add hooks/cfrs2005/claude-init/pre-tool-use
About the project

claude-init is an archived project template for initializing Claude Code development environments, with Chinese-localized configuration and workflows. Developers on macOS or Linux use it to set up agents, skills, commands, rules, hooks, and development contexts for Claude Code. Its catalogue entries provide the included commands, agents, hooks, and skills.

cfrs2005/claude-init · 1,361 stars · on GitHub

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/cfrs2005/claude-init

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/cfrs2005/claude-init/pre-tool-use/github.svg)](https://agentmods.dev/hooks/cfrs2005/claude-init/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/cfrs2005/claude-init/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/cfrs2005/claude-init/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/cfrs2005/claude-init/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/cfrs2005/claude-init/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 47% 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

47% identical to SessionStart — 51 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.

templates/.claude/hooks/hooks.json · 54 lines

How it starts

The opening of the file, as written. The whole thing — 54 lines — stays where its author put it; the contents beside it link to each section on GitHub.

{
  "PreToolUse": [
    {
      "matcher": "tool == \"Bash\" && tool_input.command matches \"(npm run dev|pnpm( run)? dev|yarn dev|bun run dev)\"",
      "hooks": [
        {
          "type": "command",
          "command": "#!/bin/bash\ninput=$(cat)\ncmd=$(echo \"$input\" | jq -r '.tool_input.command // \"\"')\n\n# Block dev servers that aren't run in tmux\necho '[Hook] 已拦截: 开发服务器必须在 tmux 中运行以确保日志访问' >&2\necho '[Hook] 请改用此命令:' >&2\necho \"[Hook] tmux new-session -d -s dev 'npm run dev'\" >&2\necho '[Hook] 然后: tmux attach -t dev' >&2\nexit 1"
        }
      ],
      "description": "拦截 tmux 外的开发服务器 - 确保你可以访问日志"
    },
    {
      "matcher": "tool == \"Bash\" && tool_input.command matches \"(npm (install|test)|pnpm (install|test)|yarn (install|test)|bun (install|test)|cargo build|make|docker|pytest|vitest|playwright)\"",
      "hooks": [
        {
          "type": "command",
          "command": "#!/bin/bash\ninput=$(cat)\nif [ -z \"$TMUX\" ]; then\n  echo '[Hook] 建议在 tmux 中运行以确保持久化' >&2\n  echo '[Hook] tmux new -s dev  |  tmux attach -t dev' >&2\nfi\necho \"$input\""
        }
      ],
      "description": "提醒对长时间运行的命令使用 tmux"
    },
    {
      "matcher": "tool == \"Bash\" && tool_input.command matches \"git push\"",
      "hooks": [
        {
          "type": "command",
          "command": "#!/bin/bash\n# Open editor for review before pushing\necho '[Hook] 推送前请审查变更...' >&2\n# 取消注释你偏好的编辑器:\n# zed . 2>/dev/null\n# code . 2>/dev/null\n# cursor . 2>/dev/null\necho '[Hook] 按 Enter 继续推送,或按 Ctrl+C 中止...' >&2\nread -r"
        }
      ],
      "description": "git push 前暂停以审查变更"
    },
    {
      "matcher": "tool == \"Write\" && tool_input.file_path matches \"\\\\.(md|txt)$\" && !(tool_input.file_path matches \"README\\\\.md|CLAUDE\\\\.md|AGENTS\\\\.md|CONTRIBUTING\\\\.md\")",
      "hooks": [
        {
          "type": "command",
          "command": "#!/bin/bash\n# Block creation of unnecessary documentation files\ninput=$(cat)\nfile_path=$(echo \"$input\" | jq -r 

Read the full file on GitHub · 54 lines

Same file

What else hooks.json configures

This page is one entry in a file that holds 5. 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 · 54 lines scan A f7f49eda44db

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository cfrs2005/claude-init (1,361 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 47% identical to SessionStart, differing in 51 lines, and is treated as a copy.