Gemini 3 Prompting Guide - System Instructions — Free…
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    Best Practices

    Gemini 3 Prompting Guide - System Instructions

    Google Cloud April 23, 2026
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    Google's official Gemini 3 prompting guide covering system instructions best practices. Gemini 3 follows short, direct instructions better than previous versions.

    Rule Content
    For Gemini 3: Keep the task to one sentence. Name the output format in one line. Remove repeated constraints from old Gemini 2.x prompts. Use XML-style tags or Markdown headings for structure. Place essential constraints and role definitions at the beginning.

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