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kraken: Hook for Claude Code

.claude/settings.json

PreToolUse is a hook for Claude Code from rafael-adcp/kraken. Its token cost is not measured, scanned A, original, MIT.

A pre-tool hook configuration that runs checks before the agent uses shell, search, file-reading, or file-listing tools. It comes from the graphify hook-guard project.

In plain words
What is it for?
Running guard checks before Bash or search commands, and before reading or listing files.
Why use it?
It adds an automatic check before selected tool calls, helping enforce whatever protections the hook-guard search and read commands provide.

Hook for Claude Code

Written for Claude Code: PreToolUse hook event.

This is rafael-adcp/kraken's own configuration. It tells Claude Code how to work on kraken itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything kraken configures →

Part of the kraken plugin — 3 skills, 3 hooks shipped together

One of 2 entries in settings.json upstream. Installing this one merges just its entry into your config; the other 1 are separate, each on its own page.

not rated 4repo 1mo ago A scan tokens not measured original MIT
View source ↗ rafael-adcp/kraken
Reuse

Borrowing it

Nothing to install: this file belongs to rafael-adcp/kraken. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/rafael-adcp/kraken/main/.claude/settings.json
Clone the repo
git clone --depth 1 https://github.com/rafael-adcp/kraken

Made for: Claude Code.

Or install kraken, the plugin that ships this one along with the rest of its 3 skills, 3 hooks.

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/rafael-adcp/kraken/pre-tool-use.svg)](https://agentmods.dev/hooks/rafael-adcp/kraken/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/rafael-adcp/kraken/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/rafael-adcp/kraken/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. 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 7d 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

2 near-identical copies found in the catalogue:

.claude/settings.json · 22 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Bash|Grep",
      "hooks": [
        {
          "type": "command",
          "command": "graphify hook-guard search"
        }
      ]
    },
    {
      "matcher": "Read|Glob",
      "hooks": [
        {
          "type": "command",
          "command": "graphify hook-guard read"
        }
      ]
    }
  ]
}
Same file

What else settings.json configures

This page is one entry in a file that holds 2. 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.

  1. 7d ago First seen · 22 lines scan A ad45ed06d6e3

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository rafael-adcp/kraken (4 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 Codeagent-orchestrationai-agentsclaude-code-plugingithub-issuestask-queue
Related

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Habitat-Thinking/ai-literacy-superpowers · not measured

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PostToolUse

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SubagentStart

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dbc-oduffy/coordinator-claude · not measured

Stop

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dbc-oduffy/coordinator-claude · not measured

SubagentStop

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dbc-oduffy/coordinator-claude · not measured