claude-hook-writer SKILL.md skillA
claude-hook-writer from secondsky/claude-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add secondsky/claude-skills/claude-hook-writer@v2.0.0Pins v2.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- secondsky/claude-skills
- Path
plugins/claude-hook-writer/skills/claude-hook-writer/SKILL.md- Versions recorded
- 2
- Latest version
- v2.0.0, committed Apr 2, 2026
- First version recorded
- Dec 24, 2025
- Size
- 12,657 bytes
- Repository stars
- 247
- License
- MIT
Expert guidance for writing secure, reliable, and performant Claude Code hooks - validates design decisions, enforces best practices, and prevents common pitfalls. Use when creating, reviewing, or debugging Claude Code hooks.
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
# Claude Hook Writer **Status**: Production Ready **Version**: 2.0.0 (Optimized with progressive disclosure) **Last Updated**: 2025-12-17 --- ## Overview Expert guidance for writing secure, reliable, and performant Claude Code hooks. This skill validates design decisions, enforces best practices, and prevents common pitfalls. --- ## When to Use This Skill - Designing a new Claude Code hook - Reviewing existing hook code - Debugging hook failures - Optimizing slow hooks - Securing hooks that handle sensitive data - Publishing hooks as PRPM packages --- ## Core Principles ### 1. Security is Non-Negotiable Hooks execute automatically with user permissions and can read, modify, or delete any file the user can access. **ALWAYS validate and sanitize all input.** Hooks receive JSON via stdin—never trust it blindly. **For complete security patterns**: Load `references/security-requirements.md` when implementing validation or securing hooks. ### 2. Reliability Over Features A hook that works 99% of the time is a broken hook. Edge cases (Unicode filenames, spaces in paths, missing tools) will happen. **Test with edge cases before deploying.** …
Read the whole file at its exact version.
How to install
mdr add secondsky/claude-skills/claude-hook-writer@sha256:a983b5bd2b12b0ceThe line at the top of this page pins the label v2.0.0, 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_u52rg2lb65hkuawu)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Dec 24, 2025 and Apr 2, 2026, about one every 100 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v2.0.0 latest | 2026-04-02 | 75421fa | 12,657 B | A | view · diff |
| v2.0.0 | 2025-12-24 | ba827ce | 12,644 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 (12657 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
secondsky/claude-skills · 247 stars · license MIT · pushed 2026-10-31 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_u52rg2lb65hkuawu GET https://markdownregistry.com/api/v1/resolve?ref=secondsky/claude-skills/claude-hook-writer GET https://markdownregistry.com/api/v1/blob/a983b5bd2b12b0ce5bdc5f01305ae86923966bc0b59adb6fe496e341eb3dc2fc
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.