Writing a good CLAUDE.md

LLMs are stateless and only know what's provided in each conversation, making CLAUDE.md essential as the file automatically injected into every agent session to onboard Claude with codebase context covering what (tech stack and structure), why (project purpose), and how (development workflows). However, Claude frequently ignores CLAUDE.md content due to a system reminder instructing it to filter irrelevant information, so effective files should contain only broadly applicable instructions rather than task-specific workarounds to avoid being dismissed as noise.

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