Java One

Mar 31, 2026 · Artificial Intelligence

Master Claude Code Hooks: PreToolUse & PostToolUse for Secure AI Workflows

This guide explains how to use Claude Code hooks—PreToolUse and PostToolUse—to run custom commands before or after tool execution, configure them in global or project settings, and implement practical examples such as blocking .env file access, type‑checking TypeScript, and preventing duplicate queries.