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PreToolUse

PreToolUse is a hook for coding agents from Djarvur/cc-websearch. Its token cost is not measured, scanned A, original, MIT.

A hook configuration that runs shell checks before WebSearch and WebFetch tool calls. It blocks those tools and directs the agent to use a separate web-search skill instead.

In plain words
What is it for?
Use it when enforcing tool policy for web searches and page fetching in Claude Code sessions.
Why use it?
It prevents unavailable web tools from being called and provides a defined alternative for internet access.

Hook

Part of the cc-websearch plugin — 2 skills, 1 hook shipped together

not rated 21 4d ago A scan tokens not measured original MIT
View the source file Djarvur/cc-websearch
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/djarvur/cc-websearch/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/Djarvur/cc-websearch

Or install cc-websearch, the plugin that ships this one along with the rest of its 2 skills, 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/djarvur/cc-websearch/pre-tool-use.svg)](https://agentmods.dev/hooks/djarvur/cc-websearch/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/djarvur/cc-websearch/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/djarvur/cc-websearch/pre-tool-use.svg" alt="Measured on agentmods" 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. 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 4d 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.

hooks/hooks.json · 22 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "WebSearch",
      "hooks": [
        {
          "type": "command",
          "command": "echo '{\"hookSpecificOutput\":{\"hookEventName\":\"PreToolUse\",\"permissionDecision\":\"deny\",\"permissionDecisionReason\":\"WebSearch tool is unavailable. Use cc-websearch:websearch Skill instead.\"}}'"
        }
      ]
    },
    {
      "matcher": "WebFetch",
      "hooks": [
        {
          "type": "command",
          "command": "echo '{\"hookSpecificOutput\":{\"hookEventName\":\"PreToolUse\",\"permissionDecision\":\"deny\",\"permissionDecisionReason\":\"WebFetch tool is unavailable. Use cc-websearch:webfetch Skill instead.\"}}'"
        }
      ]
    }
  ]
}
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. 4d ago First seen · 22 lines scan A 8c9de4d9a610

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository Djarvur/cc-websearch (21 stars, last pushed 4d 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 2026-08-30.

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