CLAUDE.md is the main place for persistent instructions that Claude Code should follow while working on a project. Use it for stable rules such as the required language version, coding style, architecture, test commands, important directories, and forbidden changes. For example, you can state that PHP 8.4 is required, database access must use a specific service, and tests must run with a particular command. Keep the file focused on rules that apply to many tasks rather than filling it with details about one temporary feature. You can also explain important project conventions that are difficult to discover from the code alone. A good CLAUDE.md prevents the AI from repeatedly guessing the same project rules and therefore reduces unnecessary corrections. Think of CLAUDE.md as instructions for the development agent, while the actual feature requirements belong in task or specification documents. Review CLAUDE.md when the project changes so old instructions do not cause Claude Code to make incorrect decisions.

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