Gemini Prompt Construction Strategies

Goal

Design high-quality prompts that guide Gemini to produce accurate, relevant, and stylistically appropriate outputs by applying proven prompting techniques.

Core Techniques

1. Zero-Shot Prompting

• Usage: Use for simple tasks where no prior examples are needed.
• Format: Provide a clear description of the task and the input text.
• Constraint: Best for straightforward requests like "Summarize this text" or "Translate this sentence."

2. Few-Shot Prompting

• Usage: Use when you need to steer the model toward a specific output structure, pattern, or style.
• Rule of Thumb: Provide 3 to 5 examples of the input-output pattern.
• Classification Tasks: When using few-shot for classification, ensure you mix up the classes in your examples to prevent the model from overfitting to a specific order.
• Format:

``text Input: [Example 1] Output: [Desired Result 1] Input: [Example 2] Output: [Desired Result 2] ... Input: [Actual Task] Output: ``

3. Role Prompting

• Usage: Assign a specific persona (e.g., "book editor," "travel guide") to control the tone, style, and perspective of the response.
• Implementation: Start the prompt with "Act as a [Role]..." or "You are a [Role]...".
• Benefit: Improves relevance and consistency with the desired domain expertise.

4. System vs. Contextual Prompting

• System Prompting: Define the "big picture" goal or overarching rule (e.g., "Always return JSON," "Be respectful").
• Contextual Prompting: Provide immediate, task-specific background info (e.g., "Context: You are writing for a blog about retro 80's arcade games").

Configuration Guidelines

• Creativity (Temperature):

Factual/Math: Set Temperature to 0. Balanced: Set Temperature to 0.2, Top-P to 0.95, Top-K to 30. * Creative: Set Temperature to 0.9, Top-P to 0.99, Top-K to 40.

Best Practices

• Simplicity: Use positive instructions (what to do) rather than negative constraints (what not to do).
• Specificity: Be specific about the output format. For data extraction, explicitly request JSON output to limit hallucinations.