Context Engineering - Claude Code Blog

Most people try to cut their Claude Code bill by switching to a cheaper model. That's the wrong first move. Here's what actually drives token spend in an agentic session — and seven levers that cut it without making the agent worse.

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Claude Code now ships with a persistent, file-based memory system that remembers user preferences, project decisions, and feedback across sessions. Here's how it works and how to get the most out of it.

Context engineering is the most important skill for working with AI coding agents. Learn proven techniques to structure your project context, CLAUDE.md files, and prompts so Claude Code produces better code on the first try.