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Writing Hookify Rules

Hookify rules are markdown files with YAML frontmatter that define patterns to watch for and messages to show when those patterns match. Rules are stored in .claude/hookify.{rule-name}.local.md files.

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Markdown

--- name: hookify-rules description: This skill should be used when the user asks to create a hookify rule, write a hook rule, configure hookify, add a hookify rule, or needs guidance on hookify rule syntax and patterns. ---

Writing Hookify Rules

Overview

Hookify rules are markdown files with YAML frontmatter that define patterns to watch for and messages to show when those patterns match. Rules are stored in `.claude/hookify.{rule-name}.local.md` files.

Rule File Format

Basic Structure

---
name: rule-identifier
enabled: true
event: bash|file|stop|prompt|all
pattern: regex-pattern-here
---

Message to show Claude when this rule triggers.
Can include markdown formatting, warnings, suggestions, etc.

Frontmatter Fields

| Field | Required | Values | Description | |-------|----------|--------|-------------| | name | Yes | kebab-case string | Unique identifier (verb-first: warn-*, block-*, require-*) | | enabled | Yes | true/false | Toggle without deleting | | event | Yes | bash/file/stop/prompt/all | Which hook event triggers this | | action | No | warn/block | warn (default) shows message; block prevents operation | | pattern | Yes* | regex string | Pattern to match (*or use conditions for complex rules) |

Advanced Format (Multiple Conditions)

---
name: warn-env-api-keys
enabled: true
event: file
conditions:
  - field: file_path
    operator: regex_match
    pattern: \.env$
  - field: new_text
    operator: contains
    pattern: API_KEY
---

You're adding an API key to a .env file. Ensure this file is in .gitignore!

**Condition fields by event:**

  • bash: `command`
  • file: `file_path`, `new_text`, `old_text`, `content`
  • prompt: `user_prompt`

**Operators:** `regex_match`, `contains`, `equals`, `not_contains`, `starts_with`, `ends_with`

All conditions must match for rule to trigger.

Event Type Guide

bash Events

Match Bash command patterns:

  • Dangerous commands: `rm\s+-rf`, `dd\s+if=`, `mkfs`
  • Privilege escalation: `sudo\s+`, `su\s+`
  • Permission issues: `chmod\s+777`

file Events

Match Edit/Write/MultiEdit operations:

  • Debug code: `console\.log\(`, `debugger`
  • Security risks: `eval\(`, `innerHTML\s*=`
  • Sensitive files: `\.env Writing Hookify Rules - Brabrix Skill Hub , `credentials`, `\.pem Writing Hookify Rules - Brabrix Skill Hub

stop Events

Completion checks and reminders. Pattern `.*` matches always.

prompt Events

Match user prompt content for workflow enforcement.

Pattern Writing Tips

Regex Basics

  • Escape special chars: `.` to `\.`, `(` to `\(`
  • `\s` whitespace, `\d` digit, `\w` word char
  • `+` one or more, `*` zero or more, `?` optional
  • `|` OR operator

Common Pitfalls

  • **Too broad**: `log` matches "login", "dialog" — use `console\.log\(`
  • **Too specific**: `rm -rf /tmp` — use `rm\s+-rf`
  • **YAML escaping**: Use unquoted patterns; quoted strings need `\\s`

Testing

python3 -c "import re; print(re.search(r'your_pattern', 'test text'))"

File Organization

  • **Location**: `.claude/` directory in project root
  • **Naming**: `.claude/hookify.{descriptive-name}.local.md`
  • **Gitignore**: Add `.claude/*.local.md` to `.gitignore`

Commands

  • `/hookify [description]` - Create new rules (auto-analyzes conversation if no args)
  • `/hookify-list` - View all rules in table format
  • `/hookify-configure` - Toggle rules on/off interactively
  • `/hookify-help` - Full documentation

Quick Reference

Minimum viable rule:

---
name: my-rule
enabled: true
event: bash
pattern: dangerous_command
---
Warning message here