Can hooks block Claude from making certain changes?

Yes, hooks configured for the PreToolUse event can return exit code 2 or a JSON 'deny' decision to block Claude from executing specific tools or editing protected files.

How do hooks receive data from Claude Code?

Claude Code sends event data to hooks via stdin as a JSON object, which can be easily parsed using tools like jq to extract file paths, tool inputs, or session IDs.

What are Claude Code hooks?

Hooks are user-defined shell commands that execute automatically at specific points in the Claude Code lifecycle, such as before a tool is used or when a session starts.

Do I need to manually trigger these hooks?

No, hooks are deterministic and triggered automatically by the system whenever the matching lifecycle event or tool invocation occurs.

Where are hook configurations stored?

Hook configurations can be stored in project-level settings (.claude/settings.json), user-level global settings, or bundled within specific plugins.

Claude Code Hook Configuration

Name: Claude Code Hook Configuration
Author: andisab

byandisab

•

Productivity & Workflow

Automates Claude Code workflows by configuring lifecycle hooks for tool execution, event handling, and security enforcement.

The Hook Configuration skill empowers developers to extend Claude Code's capabilities by implementing deterministic shell commands at critical lifecycle events. Whether you need to enforce security by blocking sensitive file edits, automate code formatting after every write operation, or set up custom desktop notifications, this skill provides the patterns and specifications required for production-ready automation. It bridges the gap between LLM reasoning and system-level control, ensuring consistent workflows across local and shared development environments by managing hook events such as PreToolUse, PostToolUse, and SessionStart.

Key Features

01Automated Code Formatting and Linting integration

02JSON-based Tool Data Filtering using jq for precise matching

03Lifecycle Event Automation for 10 distinct trigger points

04Custom Notification and Alert Handlers for macOS, Linux, and Windows

05Deterministic Security and Permission Control via exit codes

063 GitHub stars

Use Cases

01Triggering desktop notifications or Slack alerts when Claude completes a task or requires user input.

02Automatically running Prettier, Black, or gofmt after Claude modifies source code files.

03Enforcing file protection policies to prevent Claude from editing sensitive secrets or production configs.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add andisab/swe-marketplace hook-configuration

For use in Claude.ai and ChatGPT

Download Skill