• If aggressive prompt reduction improves rather than degrades results, most existing project instructions are actively harmful.
• Anthropic explains how it stripped over 80% of Claude Code's system prompt for newer Claude 5-generation models (Opus 5, Fable 5) with no measurable drop in coding evaluation performance.
• The post argues that older prompts, CLAUDE.md files, and skills often over-constrained the model with conflicting instructions, and that newer models can rely more on judgment plus new memory, artifact, and skill tooling instead of rigid rules — with a `/doctor` command in Claude Code to help rightsize a user's own context setup.

• postWe removed ~80% of the Claude Code system prompt — what we learned about writing system prompts, skills, and CLAUDE.mds

• postWe removed ~80% of the Claude Code system prompt — what we learned about writing system prompts, skills, and CLAUDE.mdstrq212
• repoContext Engineering Introgithub.com
• repoClaude Code Best Practices Guidegithub.com

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