Users of Anthropic's Claude models, particularly Claude Code, are advised to periodically delete and rebuild their custom instructions and skills. This practice, recommended by Anthropic's Boris Cherny and demonstrated by AI tutorial creator Charlie from MarTech AI, stems from the observation that older instructions can become a hindrance as models improve. Cherny suggests that for users not building agentic products, deleting and re-establishing Claude instructions every six months can lead to surprising improvements, as the model itself has been optimized by Anthropic, with 80% of the system prompt for Opus 5 and Fable 5 being removed. AI
IMPACT Users may see improved performance by periodically refreshing their custom instructions and skills for Claude models.
RANK_REASON The item discusses best practices and advice for using an existing AI model, rather than announcing a new release or significant development.
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