A help guide for Hookify, a plugin that runs checks when an agent uses tools or receives prompts. It explains how simple Markdown files can define rules that warn about unwanted actions.

Use it to learn which events are available, where rule files go, and how to create warnings for commands, file changes, prompts, or stopping actions.

It removes the need to understand Hookify's hook events and configuration structure before creating safeguards for an agent.

help — Skill for Claude Code and Codex by anthony-spruyt: A help guide for Hookify, a plugin that runs…

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 skills/anthony-spruyt/claude-plugins/help

Any agent

npx skills add anthony-spruyt/claude-plugins --skill help

Clone the repo

git clone --depth 1 https://github.com/anthony-spruyt/claude-plugins

Made for: Claude Code, Codex.

Or install hookify-plus, the plugin that ships this one along with the rest of its 5 skills, 1 agent, 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/anthony-spruyt/claude-plugins/help.svg)](https://agentmods.dev/skills/anthony-spruyt/claude-plugins/help)

Your own site

<a href="https://agentmods.dev/skills/anthony-spruyt/claude-plugins/help"><img src="https://agentmods.dev/badge/skills/anthony-spruyt/claude-plugins/help.svg" alt="Measured on agentmods" height="20"></a>

Per session 56 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 835 The whole file, excluding the scripts and references it only reads on demand.

Security scan C 1 finding. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5	$0.00056	$0.00835
Opus 5	$0.00028	$0.00417
Sonnet 5	$0.00011	$0.00167
Haiku 4.5	$0.00006	$0.00084

Measured 3d ago against content hash dbb90b33522d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

help scanned grade C with 1 finding 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 body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

/hookify Warn me when I try to use rm -rf

hookify-plus/skills/help/SKILL.md · 117 lines

How it starts

The opening of the file, as written. The whole thing — 117 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Hookify Plugin Help

Explain how the hookify plugin works and how to use it.

Overview

The hookify plugin makes it easy to create custom hooks that prevent unwanted behaviors. Instead of editing hooks.json files, create simple markdown configuration files that define patterns to watch for.

How It Works

Hook System

Hookify installs generic hooks that run on these events:

PreToolUse: Before any tool executes (Bash, Edit, Write, etc.)
PostToolUse: After a tool executes
Stop: When Claude wants to stop working
UserPromptSubmit: When user submits a prompt

These hooks read configuration files from .claude/hookify-plus/*.md and check if any rules match the current operation.

Configuration Files

Create rules as .md files in the .claude/hookify-plus/ directory:

---
name: warn-dangerous-rm
enabled: true
event: bash
pattern: rm\s+-rf
---

Warning: Dangerous rm command detected!

This command could delete important files. Verify the path.

Key fields:

name: Unique identifier for the rule
enabled: true/false to activate/deactivate
event: bash, file, stop, prompt, or all
pattern: Regex pattern to match (case-insensitive)
warn_once: Only warn once per session (optional)
warn_interval: Warn every N matches; 0 = every time (optional)

The message body is what Claude sees when the rule triggers.

Creating Rules

Option A: Use /hookify command

/hookify Don't use console.log in production files

This analyzes the request and creates the appropriate rule file.

Option B: Create manually

Create .claude/hookify-plus/my-rule.md with the format above.

Option C: Analyze conversation

/hookify

Without arguments, hookify analyzes recent conversation to find behaviors to prevent.

Available Commands

/hookify - Create hooks from conversation analysis or explicit instructions
/hookify:help - Show this help
/hookify:list - List all configured hooks
/hookify:configure - Enable/disable existing hooks interactively

Read the full file on GitHub · 117 lines

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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 · 117 lines · 56 tokens per session scan C dbb90b33522d

Subscribe to this mod's changes

help is a skill published in the GitHub repository anthony-spruyt/claude-plugins (2 stars, last pushed 6d ago), licensed MIT. It adds 56 tokens to every session and 835 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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help