Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add anthony-spruyt/claude-plugins/plugin install hookify-plusWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/anthony-spruyt/claude-plugins/help)<a href="https://agentmods.dev/skills/anthony-spruyt/claude-plugins/help"><img src="https://agentmods.dev/badge/skills/anthony-spruyt/claude-plugins/help/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/anthony-spruyt/claude-plugins/help"><img src="https://agentmods.dev/badge/skills/anthony-spruyt/claude-plugins/help.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00056 | $0.00885 |
| Opus 5.5 | $0.00022 | $0.00354 |
| Sonnet 5.5 | $0.00011 | $0.00177 |
| Haiku 4.5 | $0.00006 | $0.00089 |
Grade C, and why
help scanned grade C with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 17d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
/hookify Warn me when I try to use rm -rf How it starts
The opening of the file, as written. The whole thing — 117 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Hookify Plugin Help
Explain how the hookify plugin works and how to use it.
Overview
The hookify plugin makes it easy to create custom hooks that prevent unwanted behaviors. Instead of editing hooks.json files, create simple markdown configuration files that define patterns to watch for.
How It Works
Hook System
Hookify installs generic hooks that run on these events:
- PreToolUse: Before any tool executes (Bash, Edit, Write, etc.)
- PostToolUse: After a tool executes
- Stop: When Claude wants to stop working
- UserPromptSubmit: When user submits a prompt
These hooks read rule files from .claude/hookify-plus/*.md (project), ~/.claude/hookify-plus/*.md (global), and <sibling_plugin>/hookify-plus/*.md (plugins in the same marketplace), and check if any rules match the current operation.
Configuration Files
Create rules as .md files in the .claude/hookify-plus/ directory:
---
name: warn-dangerous-rm
enabled: true
event: bash
pattern: rm\s+-rf
---
Warning: Dangerous rm command detected!
This command could delete important files. Verify the path.
Key fields:
name: Unique identifier for the ruleenabled: true/false to activate/deactivateevent: bash, file, read, stop, prompt, or allpattern: Regex pattern to match (case-insensitive)warn_once: Only warn once per agent (main thread and each subagent) (optional)warn_interval: Warn every N matches; 0 = every time (optional)
The message body is what Claude sees when the rule triggers.
Creating Rules
Option A: Use /hookify command
/hookify Don't use console.log in production files
This analyzes the request and creates the appropriate rule file.
Option B: Create manually
Create .claude/hookify-plus/my-rule.md with the format above.
Option C: Analyze conversation
/hookify
Without arguments, hookify analyzes recent conversation to find behaviors to prevent.
Available Commands
/hookify- Create hooks from conversation analysis or explicit instructions/hookify-plus:help- Show this help/hookify-plus:list- List all configured hooks/hookify-plus:configure- Enable/disable existing hooks interactively
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 17d ago Changed 1034f75ba86d
- 22d ago Changed bf6d2cf945e5
- 1mo ago First seen · 117 lines · 56 tokens per session scan C dbb90b33522d
help is a skill published in the GitHub repository anthony-spruyt/claude-plugins (2 stars, last pushed yesterday), licensed MIT. It adds 56 tokens to every session and 885 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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