CLAUDE.md: The File That Makes Every Claude Code Session Instantly Context-Aware

CLAUDE.md: The File That Makes Every Claude Code Session Instantly Context-Aware Every time you start a new Claude Code session, you start from zero. Claude does not remember your project conventions. It does not know that you never use var , that your API routes follow a specific pattern, or that the payments module should never be touched without a migration file. You have to re-explain all of it, every session. Or you write it down once in a CLAUDE.md file. CLAUDE.md is a plain markdown file