A hook that runs a Node.js script before the coding agent uses a tool. Node.js is a program that runs JavaScript outside a web browser.

Use it for actions that should happen before every tool call. The exact action is defined by notify-stop.js.

It provides an automatic step before tool use, so checks or notifications do not have to be started by hand.

PreToolUse — Hook for coding agents by abhinav1602: A hook that runs a Node.js script before the…

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/abhinav1602/claude-code-notify/pre-tool-use

Clone the repo

git clone --depth 1 https://github.com/abhinav1602/claude-code-notify

Or install claude-code-notify, the plugin that ships this one along with the rest of its 4 hooks.

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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

UserPromptSubmit — 89% identical, 2 lines differ

hooks/hooks.json · 15 lines

What it actually says

{
  "PreToolUse": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "node",
          "args": [
            "${CLAUDE_PLUGIN_ROOT}/scripts/notify-stop.js"
          ]
        }
      ]
    }
  ]
}

Same file

What else `hooks.json` configures

This page is one entry in a file that holds 4. 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.

3d ago First seen · 15 lines scan A 860748cbe0ba

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository abhinav1602/claude-code-notify (3 stars, last pushed 16d 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.

claude-code claude-code-plugin notification

PreToolUse

Getting it into your agent

Grade A, and why

Nothing flagged

Copies of this mod

What it actually says

What else `hooks.json` configures

What this file has done since we first saw it

Other hooks, from other repositories

Stop

StopFailure

UserPromptSubmit

SessionEnd

PostToolUse

SessionStart

PreToolUse

Getting it into your agent

Grade A, and why

Nothing flagged

Copies of this mod

What it actually says

What else hooks.json configures

What this file has done since we first saw it

Other hooks, from other repositories

Stop

StopFailure

UserPromptSubmit

SessionEnd

PostToolUse

SessionStart

What else `hooks.json` configures