It lets the project check or react to a task before tool use begins, without relying on the agent to remember a separate command.

PreToolUse — Hook for Claude Code by rachittshah/cc-codex

PreToolUse

PreToolUse is a hook for Claude Code from rachittshah/cc-codex. Its token cost is not measured, scanned A, original, Apache-2.0.

A pre-tool hook that runs the auto-delegate.sh script before the agent uses any tool. A hook is an automatic action tied to an agent event.

In plain words

What is it for?: Use it to detect task complexity and suggest handing suitable work to Codex before tools are used.
Why use it?: It lets the project check or react to a task before tool use begins, without relying on the agent to remember a separate command.

Written for Claude Code: PreToolUse hook event. Also seen: mentions Codex.

Good fit Use it to detect task complexity and suggest handing suitable work to Codex before tools are used.

Compare 6 hooks from other repositories ↓

Install with agentmods

npx agentmods add hooks/rachittshah/cc-codex/pre-tool-use

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/rachittshah/cc-codex

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.

README.md

[![agentmods](https://agentmods.dev/badge/hooks/rachittshah/cc-codex/pre-tool-use/github.svg)](https://agentmods.dev/hooks/rachittshah/cc-codex/pre-tool-use)

Your own site

<a href="https://agentmods.dev/hooks/rachittshah/cc-codex/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/rachittshah/cc-codex/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.

Your own site · 80×15

<a href="https://agentmods.dev/hooks/rachittshah/cc-codex/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/rachittshah/cc-codex/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 2mo 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 · 14 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "*",
      "hooks": [
        {
          "type": "command",
          "command": "./hooks/auto-delegate.sh",
          "description": "Detect task complexity and suggest Codex delegation"
        }
      ]
    }
  ]
}

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.

2mo ago First seen · 14 lines scan A 82438e0db462

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository rachittshah/cc-codex (12 stars, last pushed 1y ago), licensed Apache-2.0. 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.

PreToolUse next to 6 hooks from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
PreToolUserachittshah/cc-codex	Hook	12	1y ago	Apache-2.0	A	—	Claude Code
PostToolUsesupabase/supabase	Hook	115k	yesterday	Apache-2.0	A	—	Claude Code
SessionStartsupabase/supabase	Hook	115k	yesterday	Apache-2.0	A	—	Claude Code
SessionStartgoogle-gemini/gemini-cli	Hook	109k	yesterday	Apache-2.0	A	—	Claude Code
PreToolUseapache/superset	Hook	75k	today	Apache-2.0	A	—	Claude Code
PreToolUseanthropics/claude-cookbooks	Hook	54k	2d ago	MIT	A	—	Claude Code
PostToolUseanthropics/claude-plugins-official	Hook	46k	yesterday	Apache-2.0	A	—	Claude Code