What it does

Provides a structured guide and workflow for preventing crashes and improving production stability in iOS applications. Covers error classification, optional safety, throwable functions, dependency injection, TDD safety nets, and architecture recommendations to reduce runtime failures.

When to use it

Use when hardening an iOS app prior to release, designing features that must be stable, auditing crash-prone areas, or creating regression tests and runbooks for production incidents. Suitable for engineers writing Swift, teams adopting TDD, and incident responders.

What's included

Scripts: none bundled (has_scripts=false)
References: extended deep-dive material in references/skill-deep-dive.md (has_references=true)
Instructions: workflows for classifying error types, checklists for preventing each class, and guidance on creating stability runbooks and regression test plans.