code-patternslisted

# Code Patterns When you identify a design problem -- especially type-safety issues, validation questions, or assertion pressure -- check `.agent/memory/code-patterns/` for known solutions before inventing a new approach. ## When to Use - You are about to write an `as` cast or type assertion - You are designing a validation boundary - You see a runtime conversion that mirrors a compile-time type - You encounter a function returning a claimed type for unvalidated data - A reviewer flags assertion pressure or type widening ## Steps 1. Read `.agent/memory/code-patterns/README.md` to discover available patterns. 2. Match the current problem against each pattern's `use_this_when` field. 3. If a pattern matches, read its full file and apply the approach. 4. If no pattern matches, proceed normally -- do not force a fit. ## Important This skill is not always-active. It triggers when an engineer or agent encounters a design problem where type safety, validation, or assertion pressure is involved. It is a discovery mechanism, not a mandate.