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.

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

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.

PreToolUse — Hook by zhmxiaowo

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.

agentmods

npx agentmods add hooks/zhmxiaowo/opencode-simple/pre-tool-use

Clone the repo

git clone --depth 1 https://github.com/zhmxiaowo/opencode-simple

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 92% 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 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.

Origin

This is a copy

92% identical to PreToolUse — 62 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

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.

yesterday 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 5mo 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 92% identical to PreToolUse, differing in 62 lines, and is treated as a copy.

Git and workflow

PreToolUse

Getting it into your agent

Grade A, and why

Nothing flagged

This is a copy

How it starts

What this file has done since we first saw it

Other hooks, from other repositories

PostToolUse

SessionStart

SessionStart

PreToolUse

SessionStart

SessionStart