Claude’s new context-engineering playbook for Claude Code
Anthropic’s latest post is less about flashy model capability and more about something developers actually feel every day: how much instruction to stuff into context, and where to put it. The interesting bit is that Claude Code now appears good enough that Anthropic is actively deleting old guardrails instead of piling more on, which is a pretty telling sign of model maturity. Anthropic says it removed over 80% of Claude Code’s system prompt for newer models like Claude Opus 5 and Claude Fable 5
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