hooks-development SKILL.md skillA
hooks-development from terrylica/cc-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add terrylica/cc-skills/hooks-development@git:20261008.a4154acPins git:20261008.a4154ac in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- terrylica/cc-skills
- Path
plugins/itp-hooks/skills/hooks-development/SKILL.md- Versions recorded
- 8
- Latest version
- git:20261008.a4154ac, committed Oct 8, 2026
- First version recorded
- Feb 20, 2026
- Size
- 8,166 bytes
- Repository stars
- 2
- License
- MIT
Claude Code hooks development guide. TRIGGERS - create hook, PostToolUse, PreToolUse, Stop hook, hook lifecycle, decision block.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Hooks Development Guide for developing Claude Code hooks with proper output visibility patterns. > **Self-Evolving Skill**: This skill improves through use. If instructions are wrong, parameters drifted, or a workaround was needed — fix this file immediately, don't defer. Only update for real, reproducible issues. ## When to Use This Skill - Creating a new PostToolUse or PreToolUse hook - Hook output is not visible to Claude (most common issue) - User asks about `decision: block` pattern - Debugging why hook messages don't appear - User mentions "Claude Code hooks" or "hook visibility" --- ## Quick Reference: Visibility Patterns **Critical insight**: PostToolUse hook stdout is only visible to Claude when JSON contains `"decision": "block"`. | Output Format | Claude Visibility | | ------------------------------ | ----------------- | | Plain text | Not visible | | JSON without `decision: block` | Not visible | | JSON with `decision: block` | Visible | **Exit code behavior**: | Exit Code | stdout Behavior | Claude Visibility | …
Read the whole file at its exact version.
How to install
mdr add terrylica/cc-skills/hooks-development@sha256:dcb429ec44882971The line at the top of this page pins the label git:20261008.a4154ac, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_4gh56xswouah6z3r)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 8 versions of this file, between Feb 20, 2026 and Oct 8, 2026, about one every 33 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261008.a4154ac latest | 2026-10-08 | a4154ac | 8,166 B | A | view · diff |
| git:20260924.9166123 | 2026-09-24 | 9166123 | 8,167 B | A | view · diff |
| git:20260924.a18f4ee | 2026-09-24 | a18f4ee | 8,161 B | A | view · diff |
| git:20260625.925c6ca | 2026-06-25 | 925c6ca | 7,040 B | A | view · diff |
| git:20260625.bcaf262 | 2026-06-25 | bcaf262 | 7,046 B | A | view · diff |
| git:20260401.d376871 | 2026-04-01 | d376871 | 6,065 B | A | view · diff |
| git:20260401.1380431 | 2026-04-01 | 1380431 | 5,843 B | A | view · diff |
| git:20260220.b9a45b9 | 2026-02-20 | b9a45b9 | 5,273 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (8166 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
terrylica/cc-skills · 2 stars · license MIT · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_4gh56xswouah6z3r GET https://markdownregistry.com/api/v1/resolve?ref=terrylica/cc-skills/hooks-development GET https://markdownregistry.com/api/v1/blob/dcb429ec448829715a324e8fd62ca329627d7ad08fcab66d73654b92fd4dfb77
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.