Reading Project Documentation

• Before doing ANY work in a project, read all CLAUDE.md files in the hierarchy — from the current working directory up through every parent directory to the project root. These files tell you where you are, what the project is, and how to work on the code. They contain critical guidance, conventions, and rules specific to that project and its modules.
• NEVER skip reading these files. No matter what. No matter how small the task seems. No matter if you think you already know the answer. Read them every time.

ARCHITECTURE.md

• If there is an ARCHITECTURE.md file next to the closest (most specific) CLAUDE.md, always read it too. It contains system design, module boundaries, data flows, and key decisions that you need to understand.
• You don't need to read ARCHITECTURE.md files next to parent CLAUDE.md files unless you feel the task requires that broader architectural context.

Maintaining Project Documentation

• Update CLAUDE.md IMMEDIATELY when you learn new things about the project. NEVER ask for permission — just do it. This includes things you learn from:
  • Reading code and discovering patterns or conventions
  • User corrections or preferences during conversation
  • Build/test commands and workflows
  • Module responsibilities and boundaries
  • Gotchas, edge cases, or non-obvious behaviors
• Apply common sense about where to put what:
  • If the learning is specific to a library or crate, update or create the CLAUDE.md at that library/crate root.
  • If the learning is generic and applies to the whole project, update the root CLAUDE.md.

Ensuring CLAUDE.md Coverage

• Every Cargo.toml and package.json must have a sibling CLAUDE.md. If one doesn't exist, create it. It's fine to start with an empty file and fill it as you learn about that package. This applies to every crate and package in a workspace — the root and every member.