Hook Development

Implement event-driven automation for Claude Code plugins with hooks.

11|2|Updated Mar 31, 2026
One-click install
npx skills add https://github.com/ajsai47/holyclaude --skill hook-development-ajsai47
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: Hook Development
Source: https://github.com/ajsai47/holyclaude/tree/main/plugins/plugin-dev/skills/hook-development
Command: npx skills add https://github.com/ajsai47/holyclaude --skill hook-development-ajsai47

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires jq, and includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill eliminates the steep learning curve and security risks of building Claude Code plugin hooks from scratch, providing proven patterns, validation tools, and best practices to create reliable, secure event-driven automation without trial and error.

Core Features & Use Cases

  • Dual Hook Type Support: Implement both fast, deterministic command hooks and flexible, context-aware prompt-based hooks for all Claude Code events (PreToolUse, PostToolUse, Stop, SessionStart, etc.).
  • Built-in Validation Tools: Includes pre-built scripts to validate hook configuration schemas, test hook behavior with sample inputs, and lint hook scripts for security vulnerabilities and best practice violations.
  • Advanced Pattern Library: Access reference guides for complex use cases like multi-stage validation, cross-event state sharing, conditional hook execution, and integration with external systems like Slack or metrics tools.
  • Use Case Example: A plugin developer can use this Skill to create a PreToolUse hook that blocks dangerous bash commands, or a SessionStart hook that automatically detects the project type and loads relevant context for the AI.

Quick Start

Use the Hook Development skill to create a PreToolUse hook that validates file write operations and blocks access to sensitive system paths and credential files.

Frequently Asked Questions about Hook Development

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

FAQPage Schema
How do I create Claude Code hooks for plugin automation and tool validation?

Claude Code hooks enable event-driven plugin automation through PreToolUse or PostToolUse events. This Skill provides implementation guidance for both deterministic command hooks and context-aware prompt-based hooks to validate tool use and enforce policies.

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

Command hooks offer fast, deterministic execution for strict policy enforcement, while prompt-based hooks provide flexible, context-aware processing. This Skill supports implementing both types across all Claude Code events like SessionStart and Stop.

How do I build a PreToolUse hook to block dangerous bash commands in Claude Code?

You can build a PreToolUse hook to validate file write operations and block access to sensitive system paths using the reference patterns in this Skill. It includes pre-built scripts to test hook behavior with sample inputs.

Does hook development for Claude Code plugins require jq?

Yes, jq is required as a dependency for hook development. This Skill uses jq within its built-in validation scripts to validate hook configuration schemas and lint hook scripts for security vulnerabilities.

Can I share state across multiple Claude Code hook events?

Cross-event state sharing is supported through an advanced pattern library included in this Skill. Reference guides cover multi-stage validation, conditional hook execution, and integration with external systems.

What's the best way to test and debug Claude Code hooks for security vulnerabilities?

The best way to test Claude Code hooks is using built-in validation scripts that lint hook scripts for security vulnerabilities and best practice violations. This Skill provides testing workflows to validate configuration schemas and sample inputs.