Hookify — Dynamic Hook Rules

Create hook rules from natural language without editing hooks.json.

Step 1: Understand Intent

Parse the user's description to determine:

• Event type: bash (commands), file (edits/writes), stop (session end), prompt (user input)
• Action: warn (show message, allow) or block (deny operation)
• Pattern: regex to match against the relevant field
• Field: what to match (command, file_path, new_text, user_prompt, etc.)

Examples:

• "Warn me when I use rm -rf" → event: bash, action: warn, pattern: rm\s+-rf
• "Don't let me edit .env files" → event: file, action: block, field: file_path, pattern: \.env$
• "Block console.log in TypeScript" → event: file, action: warn, field: new_text, conditions on file_path AND new_text
• "Don't stop without running tests" → event: stop, action: block, field: transcript, operator: not_contains, pattern: pytest|npm test

Step 2: Generate Rule File

Create .claude/hookify.<short-name>.local.md:

---
name: <descriptive-kebab-case-name>
enabled: true
event: <bash|file|stop|prompt>
action: <warn|block>
pattern: <regex>  # for single-condition rules
---

<Warning/block message in markdown. Be helpful — explain WHY and suggest alternatives.>

For multi-condition rules:

---
name: <name>
enabled: true
event: <event>
action: <action>
conditions:
  - field: <field>
    operator: <regex_match|contains|not_contains|equals|starts_with|ends_with>
    pattern: <value>
  - field: <field>
    operator: <operator>
    pattern: <value>
---

<Message>

Step 3: Confirm

Show the user:

1. The generated file path and content
2. What it will catch (with example triggers)
3. What it will NOT catch (edge cases)

Step 4: Test Suggestion

Suggest a way to test the rule immediately:

• For bash rules: "Try running <command that triggers>"
• For file rules: "Try editing a file matching the pattern"
• For stop rules: "The rule will trigger next time the session ends"

Rule Naming Convention

• hookify.block-rm-rf.local.md — block dangerous rm
• hookify.warn-console-log.local.md — warn about debug code
• hookify.require-tests.local.md — require tests before stopping
• hookify.warn-env-edit.local.md — warn about .env edits

Management Commands

If user asks to list/manage rules:

• List: ls .claude/hookify.*.md and show name + event + action + enabled for each
• Disable: set enabled: false in frontmatter
• Delete: remove the file
• Enable: set enabled: true in frontmatter

Notes

• Rules take effect immediately — no restart needed
• .local.md files are gitignored by convention
• To share rules with the team, drop the .local suffix
• Keep regex patterns simple — complex patterns are hard to maintain
• Prefer warn over block for most cases
• All conditions in a rule must match (AND logic)
• No external dependencies — stdlib Python only