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/pr-pm/prpm/creating-claude-hooksnpx skills add pr-pm/prpm --skill creating-claude-hooksgit clone --depth 1 https://github.com/pr-pm/prpmWrote 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/pr-pm/prpm/creating-claude-hooks)<a href="https://agentmods.dev/skills/pr-pm/prpm/creating-claude-hooks"><img src="https://agentmods.dev/badge/skills/pr-pm/prpm/creating-claude-hooks.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 | $0.04053 |
| Opus 5 | $0.00018 | $0.02027 |
| Sonnet 5 | $0.00007 | $0.00811 |
| Haiku 4.5 | $0.00004 | $0.00405 |
Grade A, and why
creating-claude-hooks scanned grade A 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 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.
Reads agent configuration directorieslowAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
- Configure in `.claude/settings.json`, `~/.claude/settings.json`, or plugin's `hooks.json` 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 — 686 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
Two Hook Configuration Methods
Method 1: JSON Configuration (Recommended)
- Configure in
.claude/settings.json,~/.claude/settings.json, or plugin'shooks.json - Supports both command hooks and prompt hooks
- More flexible, supports matchers and timeouts
Method 2: Executable Files (Legacy)
- Place executables in
.claude/hooks/<event-name> - Simpler but less configurable
Hook Types
| Type | Description | Speed | Use Case |
|---|---|---|---|
| Command | Runs external script | Fast (ms) | Formatting, logging, file checks |
| Prompt | Uses LLM reasoning | Slow (2-10s) | Complex validation, security analysis |
Available Events
| Event | When It Fires | Can Block? | Common Use Cases |
|---|---|---|---|
PreToolUse |
Before tool execution | Yes (exit 2) | Validation, permission checks, input modification |
PostToolUse |
After tool completes | No | Formatting, logging, cleanup |
UserPromptSubmit |
Before user input processes | Yes | Prompt validation, enhancement |
SessionStart |
New session begins | No | Environment setup, context loading |
Stop |
When assistant finishes | No | Cleanup, summary, verification |
SubagentStop |
When subagent finishes | No | Subagent result processing |
PreCompact |
Before context compaction | No | Save important context |
Notification |
During alerts | No | Desktop notifications, logging |
PermissionRequest |
When permission needed | Yes | Custom permission handling |
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 · 686 lines · 37 tokens per session scan A 75539983f4a4
creating-claude-hooks is a skill published in the GitHub repository pr-pm/prpm (120 stars, last pushed 2mo ago), licensed MIT. It adds 37 tokens to every session and 4,053 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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