The .claude folder is useful when Claude Code work becomes repeated.
It gives the project a place for local instructions and workflow files.
Start with the purpose
Do not create many files first. Start by deciding what problem the folder solves.
For example, it can hold project rules, reusable commands, or agent definitions.
Keep the structure boring
A simple structure is easier to maintain.
Use clear names. Put only active instructions there. Remove old experiments when they stop helping.
Write rules for real mistakes
The best project setup prevents repeated problems.
If Claude often edits the wrong file, write that boundary. If tests are often skipped, write the test command.
The point
The .claude folder is not decoration. It is a way to make the next session start smarter.
Original Japanese Article
This article is based on the Japanese post: Claude Codeのプロジェクト設定、ちゃんとやってますか？.claude/フォルダの使い方.
