What is rulebook-guard?
rulebook-guard is a Claude Code mod by hamzafer that writing and git rules: replaces em dashes in prose, and asks before git commit --amend, an unformatted push, or personal info in notes and commits. It is listed under Security and has 268 GitHub stars.
| Type | Claude code mod |
|---|---|
| Author | hamzafer |
| Repository | hamzafer/claude-code-mods |
| Popularity | 268 GitHub stars |
| Category | Security |
| Security | Review before installing (76/100) |
| Rank | #80 of 5,272 Claude Code mods; #28 in Security |
| License | MIT |
| Last commit | 2026-10-16 |
| Stars this week | +80 |
| Hooks | 1 events |
| Sees | Bash calls, Edit calls, Write calls, every tool call |
| Draws on | nothing |
Is rulebook-guard safe to install?
rulebook-guard scores 76/100 on the MCPMods security check: Review before installing. Things to review: starts processes outside the sandbox; reads environment variables. It passed 6 of 8 checks.
Mod footprints come from claude plugin validate, which lists every event a mod hooks and every API call it makes without running it.
| Check | Result |
|---|---|
| No network access | Pass |
| Starts processes outside the sandbox | Review |
| Writes no files or config | Pass |
| Reads environment variables | Review |
| Only sees the events it hooks | Pass |
| Doesn't drive Claude | Pass |
| Passes claude plugin validate | Pass |
| Has an open-source license | Pass |
API calls in its code
| Call | What it means |
|---|---|
$.env.get | reads env vars |
$.fs.exists | reads files |
$.process.run | runs processes |
$.ui.ask | draws interface |
$.ui.toast | draws interface |
How do I install rulebook-guard?
- Check your Claude Code version. Mods need Claude Code 2.1.287 or later and are on by default.
claude --version
- Read its footprint. This lists every event it hooks and every API call it makes, without running it.
git clone https://github.com/hamzafer/claude-code-mods claude plugin validate ./claude-code-mods/mods/rulebook-guard
- Install it. Run this in your terminal, then /reload-plugins in an open session.
claude plugin marketplace add hamzafer/claude-code-mods && claude plugin install rulebook-guard@claude-code-mods
Or ask Claude to set it up
Paste this into Claude Code and it installs rulebook-guard for you:
Install the "rulebook-guard" Claude Code mod from https://github.com/hamzafer/claude-code-mods/tree/main/mods/rulebook-guard. Run claude plugin validate on it first and show me what it can access before you enable it.
More from hamzafer/claude-code-mods
This repository has at least 9 Claude Code mods on MCPMods.
- agent-radar: One live line above the prompt per running subagent: time, tool count and what it's doing. /radar shows every agent and (Low risk)
- blast-radius: Holds risky Bash commands and shows what they would change before they run. (Review before installing)
- browser-lanes: Shows if this session has a Playwright browser and who holds it. /browser clean closes leftover browsers. A subagent tha (Review before installing)
- cache-clock: A prompt-cache line under your status line, from Claude Code's own cache figures: time left while warm, hit rate and mis (Review before installing)
- context-bar: Your context window as a stacked bar above the prompt, a color per category, with token counts and the compaction point. (Low risk)
- glance: One line above the prompt with what needs you: next meeting, PRs, Linear issues and Slack DMs. /glance lists them all. (Review before installing)
- heatmap: A GitHub-style grid of your Claude Code time in a /heatmap pane, with streaks, peaks and top projects. (Review before installing)
- md-preview: Shows the Markdown files Claude edits, rendered like GitHub, in a pane next to the chat. Before and after side by side. (Review before installing)