Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/agentworkforce/relay/creating-claude-hooks-skillnpx skills add AgentWorkforce/relay --skill creating-claude-hooks-skillgit clone --depth 1 https://github.com/AgentWorkforce/relayWrote 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/agentworkforce/relay/creating-claude-hooks-skill)<a href="https://agentmods.dev/skills/agentworkforce/relay/creating-claude-hooks-skill"><img src="https://agentmods.dev/badge/skills/agentworkforce/relay/creating-claude-hooks-skill.svg" alt="Measured on agentmods" 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 | $0.00037 | $0.02674 |
| Opus 5 | $0.00018 | $0.01337 |
| Sonnet 5 | $0.00007 | $0.00535 |
| Haiku 4.5 | $0.00004 | $0.00267 |
Grade A, and why
creating-claude-hooks scanned grade A with 0 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 5d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 439 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Creating Claude Code Hooks
Use this skill when creating, improving, or publishing Claude Code hooks. Provides essential guidance on hook format, event handling, I/O conventions, and package structure.
When to Use This Skill
Activate this skill when:
- User asks to create a new Claude Code hook
- User wants to publish a hook as a PRPM package
- User needs to understand hook format or events
- User is troubleshooting hook execution
- User asks about hook vs skill vs command differences
Quick Reference
Hook File Format
| Aspect | Requirement |
|---|---|
| Location | .claude/hooks/<event-name> |
| Format | Executable file (shell, TypeScript, Python, etc.) |
| Permissions | Must be executable (chmod +x) |
| Shebang | Required (#!/bin/bash or #!/usr/bin/env node) |
| Input | JSON via stdin |
| Output | Text via stdout (shown to user) |
| Exit Codes | 0 = success, 2 = block, other = error |
Available Events
| Event | When It Fires | Common Use Cases |
|---|---|---|
session-start |
New session begins | Environment setup, logging, checks |
user-prompt-submit |
Before user input processes | Validation, enhancement, filtering |
tool-call |
Before tool execution | Permission checks, logging, modification |
assistant-response |
After assistant responds | Formatting, logging, cleanup |
Hook Format Requirements
File Location
Project hooks:
.claude/hooks/session-start
.claude/hooks/user-prompt-submit
User-global hooks:
~/.claude/hooks/session-start
~/.claude/hooks/tool-call
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.
- 5d ago First seen · 439 lines · 37 tokens per session scan A 9c19727c479c
creating-claude-hooks is a skill published in the GitHub repository AgentWorkforce/relay (812 stars, last pushed today), licensed Apache-2.0. It adds 37 tokens to every session and 2,674 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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