Writing Hookify Rules

This walks you through creating Hookify rules, which are markdown files that watch for patterns in Claude's tool use and fire warnings or blocks when they match. You'd use it when you want to prevent dangerous bash commands, catch console.log statements before they ship, or enforce checklists before Claude stops working. The guide covers the YAML frontmatter structure, regex pattern writing, and the difference between simple pattern matches and multi-condition rules. It's thorough on the mechanics but light on philosophy. If you're setting up guardrails in a codebase where Claude might do something you'll regret later, this gives you the syntax and examples to write those rules quickly.