What is hook-factory?

A tool for creating and installing Claude Code hooks, which are scripts that run when specific agent events occur. It offers guided questions, templates, validation, and Unix installers.

Use it to generate hooks for events such as tool completion, session start, prompt submission, stopping, or pre-push checks, including formatting code, running tests, or loading project context.

It removes much of the manual work and risk involved in writing hooks, checking them, and installing them with backups or rollback.

hook-factory — Skill for Claude Code by alirezarezvani

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.

Any agent

npx skills add alirezarezvani/claude-code-skill-factory --skill hook-factory

Clone the repo

git clone --depth 1 https://github.com/alirezarezvani/claude-code-skill-factory

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/skills/alirezarezvani/claude-code-skill-factory/hook-factory.svg)](https://agentmods.dev/skills/alirezarezvani/claude-code-skill-factory/hook-factory)

Your own site

<a href="https://agentmods.dev/skills/alirezarezvani/claude-code-skill-factory/hook-factory"><img src="https://agentmods.dev/badge/skills/alirezarezvani/claude-code-skill-factory/hook-factory.svg" alt="Measured on agentmods" height="20"></a>

Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,988 The whole file, excluding the scripts and references it only reads on demand.

Security scan D 2 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.

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 5.1	$0.00036	$0.02988
Opus 5	$0.00018	$0.01494
Sonnet 5	$0.00007	$0.00598
Haiku 4.5	$0.00004	$0.00299

Measured 8d ago against content hash 3d5ef9bd670e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade D, and why

hook-factory scanned grade D with 2 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 8d ago.

The scan reads SKILL.md. This mod also ships 5 executable files (generator.py, hook_factory.py, install-hook.sh, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

# Install to user level (~/.claude/settings.json)

Recursive force deletehighDestructive command

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

- **Safety**: No destructive operations (rm -rf, etc.)

generated-skills/hook-factory/SKILL.md · 462 lines

How it starts

The opening of the file, as written. The whole thing — 462 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Hook Factory v2.0

Generate production-ready Claude Code hooks with interactive Q&A, automated installation, and enhanced validation.

What This Skill Does

Hook Factory v2.0 is a comprehensive hook generation system with three modes:

Interactive Mode (NEW!) - 7-question guided flow with smart defaults
Natural Language - Describe what you want in plain English
Template Mode - Direct generation from 10 production templates

Key Features:

Interactive Q&A - 7 questions with validation and smart defaults
Automated Installation - Python and Bash installers with backup/rollback
Enhanced Validation - Secrets detection, event-specific rules, command validation
10 Templates - Covering 7 event types (PostToolUse, SubagentStop, SessionStart, PreToolUse, UserPromptSubmit, Stop, PrePush)
Comprehensive Safety - Tool detection, silent failure, atomic operations
macOS/Linux Support - Production-ready for Unix environments

When to Use This Skill

Use hook-factory when you want to:

Auto-format code after editing
Automatically stage files with git
Run tests when agents complete
Load project context at session start
Create custom workflow automation
Learn how hooks work through examples

Capabilities

Three Generation Modes

1. Interactive Mode (Recommended)

python3 hook_factory.py -i

7-question guided flow
Smart defaults based on event type
Input validation and safety warnings
Optional auto-install

2. Natural Language Mode

python3 hook_factory.py -r "auto-format Python files after editing"

Simple keyword matching
Quick generation for common patterns

3. Template Mode (Advanced)

python3 hook_factory.py -t post_tool_use_format -l python

Direct template selection
Full customization control

Supported Hook Templates (10 Total)

Formatting & Code Quality:

post_tool_use_format - Auto-format after editing (Python, JS, TS, Rust, Go)
post_tool_use_git_add - Auto-stage files with git

Read the full file on GitHub · 462 lines

Files

What ships with it

27 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.

8d ago First seen · 462 lines · 36 tokens per session scan D 3d5ef9bd670e

Subscribe to this mod's changes

hook-factory is a skill published in the GitHub repository alirezarezvani/claude-code-skill-factory (859 stars, last pushed 9mo ago), licensed MIT. It adds 36 tokens to every session and 2,988 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it D with 2 findings (reads agent configuration directories, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Building agents Claude Code Code Generation ai-agents ai-tools automation claude-ai claude-skills hooks installer interactive workflow

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