We removed ~80% of the Claude Code system prompt — what we learned about writing system prompts, skills, and CLAUDE.mds
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Thariq
Author
Thariq
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Terms in this piece · Glossary
system prompt — The standing instructions a model receives before any user input — defining its role, rules, tools, and tone for the whole conversation.
AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.
Why it matters
Explains how to write leaner system prompts, skills, and CLAUDE.md files for newer, more capable coding models — showing that stripping ~80% of prompt scaffolding can improve rather than degrade AI agentAn AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.Full definition → behavior.
