defense-in-depth

Use when writing tests for serialization, validation, normalization, or pure functions - provides property catalog, pattern detection, and library reference…

Use when writing database access code, creating schemas, or managing transactions with PostgreSQL - enforces transaction safety with TX_ naming, read-write…

Use when writing or modifying React components, planning React features, or working with .jsx/.tsx files - provides modern React patterns with TypeScript…

Use when writing or reviewing tests - covers test philosophy, condition-based waiting, mocking strategy, and test isolation

Use when writing or refactoring code.

Use when writing, reviewing, or modifying Go code - covers naming, error handling and wrapping, doc comments, declarations and scope, API and interface…

Use when writing, reviewing, or modifying Python code - covers the Ruff/Mypy/uv toolchain, naming, type annotations, idioms and comprehensions, errors and…

Use when writing, reviewing, or modifying Rust code - covers error handling with thiserror+miette, type system patterns, async and serde conventions, testing…

Use when committing changes, splitting work into commits, or writing commit messages - covers atomic commits, bisect-able history, separating concerns, and…

Use every time you write or edit code comments, or perform code review

Use when writing TypeScript code, reviewing TS implementations, or making decisions about type declarations, function styles, or naming conventions -…