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Hook Development

Design Claude Code plugin hooks for event-driven automation and policy enforcement.

1|Updated May 4, 2026
Search Tags:#automation#security#validation#claude code#bash#prompt-based#plugin hooks
One-click install
npx skills add https://github.com/open-session/os_design_system --skill hook-development-open-session
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: Hook Development
Source: https://github.com/open-session/os_design_system/tree/main/.claude/plugins/plugin-dev/skills/hook-development
Command: npx skills add https://github.com/open-session/os_design_system --skill hook-development-open-session

SYSTEM DOCUMENTATION & REQUIREMENTS

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

What problem does it solve?

This Skill helps you design, validate, and implement Claude Code plugin hooks that react to session and tool events with reliable automation and strong safety checks. It solves the problem of manually wiring event-driven logic, policy enforcement, and context loading across complex plugin workflows.

Core Features & Use Cases

  • Prompt-based hooks: Create context-aware validations for PreToolUse, Stop, SubagentStop, and UserPromptSubmit events.
  • Command hooks: Run deterministic bash checks for validation, context loading, linting, and test helpers.
  • Plugin configuration guidance: Structure hooks.json correctly, choose matchers, set timeouts, and keep paths portable with CLAUDE_PLUGIN_ROOT.
  • Safety and workflow control: Block dangerous commands, validate file writes, enforce completion checks, and load environment context at session start.
  • Use case: A plugin author can use this Skill to build a guarded development workflow that approves safe tool usage, denies destructive actions, and verifies that testing and setup steps happened before stopping.

Quick Start

Ask the AI to use the Hook Development skill to create or review a Claude Code hook for your target event and ensure the configuration, scripts, and safety checks are correct.

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 plugin hooks for PreToolUse and PostToolUse events?▼

Claude Code plugin hooks are designed for event-driven automation by configuring hooks.json with matchers and running deterministic bash scripts to validate JSON inputs for PreToolUse and PostToolUse lifecycle events.

What is the best way to enforce safety checks and block dangerous commands in Claude Code?▼

Safety checks and policy enforcement in Claude Code are implemented through prompt-based validation and command hooks that block destructive actions, validate file writes, and enforce completion checks before the Stop event.

How does jq parsing work with Claude Code command hooks?▼

jq parsing in Claude Code command hooks processes JSON-validated inputs and outputs within deterministic bash scripts, requiring jq and timeout dependencies to safely execute event-driven automation logic.

Can I use portable paths in hooks.json for Claude Code plugin configuration?▼

Claude Code plugin configuration supports portable paths using the CLAUDE_PLUGIN_ROOT environment variable, ensuring hooks.json correctly structures matchers, timeouts, and lifecycle event triggers across environments.

How do I load environment context at SessionStart using Claude Code hooks?▼

SessionStart context loading is handled by configuring a lifecycle event hook in hooks.json that executes a deterministic bash script to load environment variables and validate setup before the session begins.

Do I need jq and timeout installed to run Claude Code plugin hooks?▼

Yes, jq and timeout are required dependencies for Claude Code plugin hooks because jq handles JSON-validated input parsing and timeout enforces execution limits on deterministic bash scripts.

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