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Gemini API System Instructions Best Practices
Google April 23, 2026
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Official Google documentation on using system instructions with the Gemini API. Covers how to set persona, define output formats, specify knowledge cutoff awareness, and configure behavioral constraints programmatically.
Rule Content
Set system instructions via the Gemini API to customize model behavior. Include knowledge cutoff awareness, persona definition, output format specifications, and behavioral constraints. System instructions are loaded into context before user messages.
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