How to turn Claude Code into a domain specific coding agent

Claude Code can now specialize in specific libraries like LangGraph through strategic context engineering. Testing four configurations revealed that combining a concise guidance document (Claude.md) with documentation access tools produced the best code quality. The Claude.md file, containing condensed information about common patterns and pitfalls, outperformed simply connecting raw documentation. This approach helped Claude write better code by avoiding information overload while providing access to specific details when needed.