Andrew Kane Gem Writer
This skill should be used when writing Ruby gems following Andrew Kane's proven patterns and philosophy. It applies when creating new Ruby gems, refactoring existing gems, designing gem APIs, or when clean, minimal, production-ready Ruby library code is needed. Triggers on requests like "create a gem", "write a Ruby library", "design a gem API", or mentions of Andrew Kane's style.
Install
$ agentstack add skill-antifragiletech-antifragile-claude-code-andrew-kane-gem-writer ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-antifragiletech-antifragile-claude-code-andrew-kane-gem-writer) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
Andrew Kane Gem Writer
Write Ruby gems following Andrew Kane's battle-tested patterns from 100+ gems with 374M+ downloads (Searchkick, PgHero, Chartkick, Strong Migrations, Lockbox, Ahoy, Blazer, Groupdate, Neighbor, Blind Index).
Core Philosophy
Simplicity over cleverness. Zero or minimal dependencies. Explicit code over metaprogramming. Rails integration without Rails coupling. Every pattern serves production use cases.
Entry Point Structure
Every gem follows this exact pattern in lib/gemname.rb:
# 1. Dependencies (stdlib preferred)
require "forwardable"
# 2. Internal modules
require_relative "gemname/model"
require_relative "gemname/version"
# 3. Conditional Rails (CRITICAL - never require Rails directly)
require_relative "gemname/railtie" if defined?(Rails)
# 4. Module with config and errors
module GemName
class Error = 3.1"
spec.files = Dir["*.{md,txt}", "{lib}/**/*"]
spec.require_path = "lib"
# NO add_dependency lines - dev deps go in Gemfile
endAnti-Patterns to Avoid
method_missing(usedefine_methodinstead)- Configuration objects (use class accessors)
@@class_variables(useclass << self)- Requiring Rails gems directly
- Many runtime dependencies
- Committing Gemfile.lock in gems
- RSpec (use Minitest)
- Heavy DSLs (prefer explicit Ruby)
Reference Files
For deeper patterns, see:
- [references/module-organization.md](references/module-organization.md) - Directory layouts, method decomposition
- [references/rails-integration.md](references/rails-integration.md) - Railtie, Engine, on_load patterns
- [references/database-adapters.md](references/database-adapters.md) - Multi-database support patterns
- [references/testing-patterns.md](references/testing-patterns.md) - Multi-version testing, CI setup
- [references/resources.md](references/resources.md) - Links to Kane's repos and articles
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: AntifragileTech
- Source: AntifragileTech/antifragile-claude-code
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.