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### LINKS 
https://simonwillison.net/2025/May/25/claude-4-system-prompt/
By: Simon Willison | https://x.com/simonw?lang=en

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ThePrimeTime

Anthropic published system prompts for Claude 4 models, revealing detailed instructions about personality, safety measures, copyright restrictions, and tool usage. The prompts show extensive efforts to prevent list-heavy responses, copyright violations, and harmful content while enabling features like web search with up to 5 queries and thinking blocks using XML markup. Leaked tool prompts reveal additional restrictions around reproducing copyrighted material and specific search behaviors based on query complexity.

Claude 4 System Prompt

<ul>
<li>Writing with lists doesn’t mean
<ul>
<li>It’s AI
-Meaning it was a generated article</li>
<li>It’s bad
<ul>
<li>It isn’t
<ul>
<li>Ok sometimes it is
<ul>
<li>But only sometimes</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li>Ok</li>
</ul>
