Can I use hooks to prevent Claude from deleting specific files?

Yes, you can implement a PreToolUse hook with a matcher for file-modifying tools to inspect the target path and return a 'deny' decision for sensitive files.

What are hooks in Claude Code?

Hooks are event-driven scripts or prompts that execute in response to specific Claude Code actions, allowing you to validate, modify, or block tool usage and automate workflows.

How do I make my Claude Code plugin hooks portable?

Always use the ${CLAUDE_PLUGIN_ROOT} environment variable in your hook configurations to ensure script paths remain valid regardless of where the plugin is installed.

What events can I trigger hooks on?

Claude Code supports various events including PreToolUse, PostToolUse, Stop, SessionStart, SessionEnd, and UserPromptSubmit, among others.

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

Prompt-based hooks use LLM reasoning to make context-aware decisions using natural language, while command hooks execute bash scripts for fast, deterministic file system and tool operations.

Hook Development for Claude Code

Name: Hook Development for Claude Code
Author: lusya123

bylusya123

Developer Tools

Provides comprehensive guidance and implementation patterns for creating event-driven automation hooks in Claude Code plugins.

About

The Hook Development skill is an essential resource for developers building Claude Code plugins, offering deep technical insights into implementing PreToolUse, PostToolUse, Stop, and SessionStart events. It enables the creation of sophisticated workflows using both LLM-driven prompt hooks for context-aware reasoning and deterministic command hooks for bash-based validations. By leveraging this skill, developers can enforce security policies, automate context loading, and build robust quality gates that ensure Claude interacts with the codebase safely and effectively.

Key Features

Support for the full hook lifecycle including PreToolUse, PostToolUse, and SessionStart
Deterministic Command hooks for executing high-performance bash scripts and file operations
Security-first patterns for input validation and preventing path traversal attacks
0 GitHub stars
Portable path management using the ${CLAUDE_PLUGIN_ROOT} environment variable
Advanced Prompt-based hooks for context-aware validation using natural language reasoning

Use Cases

Automating the loading of project-specific context and environment variables at the start of every session
Implementing quality control gates that verify test results or build status before allowing Claude to finish a task
Building automated security guards that block dangerous shell commands or sensitive file access

About

Key Features

Support for the full hook lifecycle including PreToolUse, PostToolUse, and SessionStart
Deterministic Command hooks for executing high-performance bash scripts and file operations
Security-first patterns for input validation and preventing path traversal attacks
0 GitHub stars
Portable path management using the ${CLAUDE_PLUGIN_ROOT} environment variable
Advanced Prompt-based hooks for context-aware validation using natural language reasoning

Use Cases

Automating the loading of project-specific context and environment variables at the start of every session
Implementing quality control gates that verify test results or build status before allowing Claude to finish a task
Building automated security guards that block dangerous shell commands or sensitive file access