Code writing

Write code whose types are true at runtime and whose failures are loud. The rules here hold in every language; each language's reference holds its toolchain, its stack and the pitfalls a model gets wrong in it.

The repo's own CLAUDE.md or AGENTS.md overrides anything here.

Always do first

1. Read the repo's CLAUDE.md / AGENTS.md. They override this skill.

2. Read the reference for the language you are writing, before the first edit:

   Language	Reference
   TypeScript	references/typescript.md
   Rust	references/rust.md
   Python	references/python.md
   Dart	references/dart.md
   Shell	references/shell.md