{"slug": "the-new-rules-of-context-engineering-for-claude-5", "title": "The New Rules of Context Engineering for Claude 5", "summary": "Anthropic's Claude 5, with its 1M-token context window, requires a new discipline of context engineering, as capacity does not equal attention, according to a Medium article by an unnamed author. The piece outlines a decision framework for using RAG, memory, compaction, context editing, and subagents to manage what the model forgets, emphasizing that compaction is a handoff, not a trash can, and that context should be a measured product surface.", "body_md": "Member-only story\n\n# The New Rules of Context Engineering for Claude 5\n\n*A 1M-token window isn’t a 1M-token attention span. Here is the decision framework for RAG, memory, compaction, context editing, and subagents.*\n\nA 1M-token context window does not give your agent a 1M-token attention span. It gives your system a massive, expensive attic to hide stale tool output, obsolete decisions, and silent performance degradation until production reliability collapses. The real Claude 5 advantage is not more context — it is an operating system for deciding what the agent should forget.\n\nIf you are using free version of Medium,\n\n[Please consider]use link to access this article for free.[, share this article with your friends to support my work. Thank you.]following and subscribing\n\n**In this Article you’ll learn**\n\n· [The 1M-Token Trap: Capacity Is Not Attention](#7228)\n\n· [The Context Routing Map: Five Jobs, Five Primitives](#294c)\n\n· [Start With the Bottleneck, Not the Feature](#9db2)\n\n· [Compaction Is a Handoff, Not a Trash Can](#da38)\n\n· [Forget Selectively: Editing and Memory Need Governance](#02bd)\n\n· [Subagents Earn Their Keep Only When Work Is Truly Separate](#43c1)\n\n· [Make Context a Measured Product Surface](#3427)\n\n· [Conclusion](#319d)", "url": "https://wpnews.pro/news/the-new-rules-of-context-engineering-for-claude-5", "canonical_source": "https://pub.towardsai.net/the-new-rules-of-context-engineering-for-claude-5-8b7723d96f7f?source=rss----98111c9905da---4", "published_at": "2026-08-01 16:31:57+00:00", "updated_at": "2026-08-01 16:52:33.642902+00:00", "lang": "en", "topics": ["large-language-models", "ai-agents", "ai-infrastructure"], "entities": ["Anthropic", "Claude 5"], "alternates": {"html": "https://wpnews.pro/news/the-new-rules-of-context-engineering-for-claude-5", "markdown": "https://wpnews.pro/news/the-new-rules-of-context-engineering-for-claude-5.md", "text": "https://wpnews.pro/news/the-new-rules-of-context-engineering-for-claude-5.txt", "jsonld": "https://wpnews.pro/news/the-new-rules-of-context-engineering-for-claude-5.jsonld"}}