Hook Development

Automate event-driven validation and policy enforcement with Codex hooks.

Updated Apr 3, 2026
One-click install
npx skills add https://github.com/jmolz/m0lz.02 --skill hook-development-jmolz
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: Hook Development
Source: https://github.com/jmolz/m0lz.02/tree/main/.agents/skills/hook-development
Command: npx skills add https://github.com/jmolz/m0lz.02 --skill hook-development-jmolz

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires Codex, CLAude Code plugin with hooks support, and includes scripts (resource) and references (resource) and assets (resource) components.

What problem does it solve?

This Skill provides comprehensive guidance for creating and implementing Codex plugin hooks, focusing on advanced prompt-based hooks for event-driven automation. It automates the validation of operations, enforces policies, and integrates external tools into workflows.

Core Features & Use Cases

  • Event-Driven Automation: Automate operations in response to Codex events like tool usage, session start, and notifications.
  • Prompt-Based Hooks: Utilize LLM-driven decision making for context-aware validation without requiring bash scripting.
  • Command Hooks: Execute bash commands for fast deterministic checks and external tool integrations.
  • Use Cases: Implementing PreToolUse for validating tool calls, using PostToolUse for reacting to results, and setting up event-driven automation with hooks like SessionStart and UserPromptSubmit.

Quick Start

Create a new hook for 'PreToolUse' that prompts for user confirmation before running a tool.

Frequently Asked Questions about Hook Development

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I automate event-driven validation using Codex hooks?

Event-driven automation with Codex hooks works by triggering prompt-based hooks for context-aware LLM validation or command hooks for deterministic bash checks, automating operations like tool usage and session starts.

What is the difference between prompt-based hooks and command hooks?

Prompt-based hooks use LLM-driven decision making for context-aware validation without bash scripting, while command hooks execute bash commands for fast deterministic checks and external tool integrations.

Do I need a specific plugin to use Codex hooks for tool integration?

Yes, using Codex hooks for tool integration requires both Codex and a CLAude Code plugin with hooks support to execute event-driven automation and policy enforcement tasks.

How do I set up a PreToolUse hook to validate tool calls?

Setting up a PreToolUse hook to validate tool calls involves creating a new hook configuration that prompts for user confirmation or executes validation checks before the target tool runs.

Can I use Codex hooks to react to tool results after execution?

Yes, you can use PostToolUse hooks to react to tool results after execution, enabling automated follow-up actions, output validation, and external tool integration within your workflow.

What are the limitations of using prompt-based hooks for automation?

Prompt-based hooks rely on LLM-driven decisions, which may introduce latency compared to command hooks. For fast deterministic checks and external tool integrations, command hooks executing bash commands are more suitable.