Gemini System Instructions: Best Practices for API and Gems…
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    System Instructions

    Gemini System Instructions: Best Practices for API and Gems

    Google AI April 24, 2026
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    Write effective system instructions for Gemini API and custom Gems that control behavior, tone, format, and safety boundaries.

    Best practices guide for Gemini system instructions. Covers instruction structure (persona, task, constraints, format), tone and style control, output format enforcement (JSON, Markdown, tables), safety boundary configuration, few-shot examples in system prompts, version management, testing methodologies, and common anti-patterns to avoid.

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