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PreToolUse

PreToolUse is a hook for Claude Code from didvc/claude-email-leak-notice. Its token cost is not measured, scanned A, original, MIT.

A pre-tool hook is a script that runs before the coding agent uses any tool. This one checks the tool request for a possible personal email address.

In plain words
What is it for?
Use it to inspect every tool request for email leaks and show a warning once per session.
Why use it?
It gives you an early warning when your email could be copied into a file or code change. It does not stop the agent or block the action.

Hook for Claude Code

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable.

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 email-leak-notice plugin — 1 hook shipped together

not rated 1repo 1mo ago A scan tokens not measured original MIT

Good fit Use it to inspect every tool request for email leaks and show a warning once per session.

Compare 6 hooks from other repositories ↓
View source ↗ didvc/claude-email-leak-notice
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 didvc/claude-email-leak-notice
Claude Code
/plugin install email-leak-notice

Made for: Claude Code.

Or install email-leak-notice, the plugin that ships this one along with the rest of its 1 hook.

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/didvc/claude-email-leak-notice/pre-tool-use/github.svg)](https://agentmods.dev/hooks/didvc/claude-email-leak-notice/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/didvc/claude-email-leak-notice/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/didvc/claude-email-leak-notice/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/didvc/claude-email-leak-notice/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/didvc/claude-email-leak-notice/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 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 9d 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.

plugins/email-leak-notice/hooks/hooks.json · 14 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "*",
      "hooks": [
        {
          "type": "command",
          "command": "bash \"${CLAUDE_PLUGIN_ROOT}/hooks/email-leak-notice.sh\"",
          "timeout": 10
        }
      ]
    }
  ]
}
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. 9d ago First seen · 14 lines scan A cccd8a3bda18

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository didvc/claude-email-leak-notice (1 stars, last pushed 1mo 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 CodeSecurityanthropicbashclaude-code-hooksclaude-code-plugindata-leak-prevention
Related

Other hooks, from other repositories

StopFailure

Runs on the StopFailure event, executing journal_event.sh via bash. From Nova-Violet-Role/RoT-DTD-GOAL.

Nova-Violet-Role/RoT-DTD-GOAL · not measured

UserPromptExpansion

Runs to expand your prompt before the agent sees it, executing journal_event.sh via bash. From Nova-Violet-Role/RoT-DTD-GOAL.

Nova-Violet-Role/RoT-DTD-GOAL · not measured

PreToolUse

Runs before the agent uses a tool for Write, Edit, MultiEdit, NotebookEdit and Bash tool calls, executing guard.sh via bash. From Nova-Violet-Role/RoT-DTD-GOAL.

Nova-Violet-Role/RoT-DTD-GOAL · not measured

PostToolUse

Runs after a tool call finishes for Write, Edit, MultiEdit and NotebookEdit tool calls, executing post_tool.sh via bash. From Nova-Violet-Role/RoT-DTD-GOAL.

Nova-Violet-Role/RoT-DTD-GOAL · not measured

PostToolBatch

Runs after a batch of tool calls, executing journal_event.sh via bash. From Nova-Violet-Role/RoT-DTD-GOAL.

Nova-Violet-Role/RoT-DTD-GOAL · not measured

PostToolUseFailure

Runs when a tool call fails, executing journal_event.sh via bash. From Nova-Violet-Role/RoT-DTD-GOAL.

Nova-Violet-Role/RoT-DTD-GOAL · not measured