Claude Code creator Boris Cherny: Anthropic deleted 80% of Claude Code’s system prompt. He says you should keep deleting yours too. 03:24 - Why Anthropic removed most of the prompt 06:42 - Delete old CLAUDE.md rules every 6 months 19:36 - Why verification replaces prompt engineering 24:44 - Dynamic workflows with thousands of agents Most developers do the opposite. The model improves, but their instruction file keeps growing with fixes for problems that no longer exist. That old scaffolding eventually becomes the constraint. Opus 5 can run for days, create agents dynamically and spend more compute when the task demands it. The bottleneck moves from producing code to proving the output is correct. The top 1% Claude Code user will not have the longest CLAUDE.md. They will have the strongest verification system.
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