When writing prompts for Claude, use XML tags to clearly delineate different sections. Claude was specifically trained to recognize XML structure.
<context>
You are a senior code reviewer at a tech company.
</context>
<instructions>
Review the following code for bugs, security issues, and style.
Provide feedback in a structured format.
</instructions>
<code>
{user's code here}
</code>This works better than markdown headers or plain-text separation because Claude was trained on lots of XML-structured prompts.