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Use when creating or publishing Claude Code hooks - covers executable format, event types, JSON I/O, exit codes, security requirements, and PRPM package structure
Passed 19 of 21 test cases with the skill, and 10 of 21 without it.
and 15 more in the full report
11 fixed9 passed either way1 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 10 test cases the skill fixed. Same model, same prompt, with and without the skill.
When publishing a Claude Code hook package via PRPM, what file name should be assigned to the `main` entry point field inside `prpm.json`?
| Checked | Without skill | With skill |
|---|---|---|
| Sets `"main"` to `"HOOK.md"` in `prpm.json`. | Missed | Passed |
The instructions your model reads when the skill loads.
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.
Activate this skill when:
| 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 |
| 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 |
test cases passed, vs 10 / 21 without
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