Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/DNYoussef/context-cascadenpx agentmods add skills/dnyoussef/context-cascade/when-creating-claude-hooks-use-hook-creatorWrote 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/dnyoussef/context-cascade/when-creating-claude-hooks-use-hook-creator)<a href="https://agentmods.dev/skills/dnyoussef/context-cascade/when-creating-claude-hooks-use-hook-creator"><img src="https://agentmods.dev/badge/skills/dnyoussef/context-cascade/when-creating-claude-hooks-use-hook-creator/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/dnyoussef/context-cascade/when-creating-claude-hooks-use-hook-creator"><img src="https://agentmods.dev/badge/skills/dnyoussef/context-cascade/when-creating-claude-hooks-use-hook-creator.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 | $0.00052 | $0.03396 |
| Opus 5.5 | $0.00021 | $0.01358 |
| Sonnet 5.5 | $0.00010 | $0.00679 |
| Haiku 4.5 | $0.00005 | $0.00340 |
Grade B, and why
hook-creator scanned grade B with 2 findings 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 1mo 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.
Asks for rootlowPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
7. Tests: Valid command, sudo command, edge cases Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Recursive force deletemediumDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
input: { tool_name: "Bash", tool_input: { command: "rm -rf /" } }, Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
How it starts
The opening of the file, as written. The whole thing — 514 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SKILL: Hook Creator
LIBRARY-FIRST PROTOCOL (MANDATORY)
Before writing ANY code, you MUST check:
Step 1: Library Catalog
- Location:
.claude/library/catalog.json - If match >70%: REUSE or ADAPT
Step 2: Patterns Guide
- Location:
.claude/docs/inventories/LIBRARY-PATTERNS-GUIDE.md - If pattern exists: FOLLOW documented approach
Step 3: Existing Projects
- Location:
D:\Projects\* - If found: EXTRACT and adapt
Decision Matrix
| Match | Action |
|---|---|
| Library >90% | REUSE directly |
| Library 70-90% | ADAPT minimally |
| Pattern exists | FOLLOW pattern |
| In project | EXTRACT |
| No match | BUILD (add to library after) |
Purpose
Create production-ready Claude Code hooks that integrate with our RBAC security system, follow official schemas, and meet performance requirements (<20ms for pre-hooks).
When to Use This Skill
- Creating new automation hooks (pre/post operations)
- Implementing security validation hooks
- Building audit/logging hooks
- Extending the RBAC permission system
- Adding custom session management hooks
8-Stage Hook Creation Methodology
Stage 1: Hook Type Selection
Identify which of the 10 hook event types you need:
| Category | Hook Type | Purpose |
|---|---|---|
| Blocking | UserPromptSubmit | Validate/modify user prompts |
| Blocking | SessionStart | Initialize session state |
| Blocking | PreToolUse | Validate tool operations |
| Blocking | PermissionRequest | Auto-approve/deny permissions |
| Observational | PostToolUse | Log tool results |
| Observational | Notification | Forward notifications |
| Observational | Stop | Cleanup on agent stop |
| Observational | SubagentStop | Track subagent completion |
| Observational | PreCompact | Preserve context during compaction |
| Observational | SessionEnd | Final session cleanup |
Stage 2: Schema Definition
Define input/output schemas based on hook type.
What ships with it
4 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.
- 1mo ago First seen · 514 lines · 52 tokens per session scan B 72590a75a100
hook-creator is a skill published in the GitHub repository DNYoussef/context-cascade (32 stars, last pushed 3mo ago), licensed MIT. It adds 52 tokens to every session and 3,396 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it B with 2 findings (asks for root, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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