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agent-skills/sn-infographic/references/prompt-writing-rules.md
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Prompt Writing Rules

Rules for generating high-quality image generation prompts. Apply these when writing the final prompt in Step 5.

1. Visual Precision

Always describe:

  • Background texture (e.g., off-white aged paper, black halftone shadows, light gray grid texture)
  • Font style (e.g., handwritten, serif print, colorful block-lettering, monospace technical)

Omitting these causes the image model to make arbitrary choices that undermine the intended aesthetic.

2. Color Avoidance

Never use hexadecimal color codes (#RRGGBB format). Use specific color names instead.

Instead of Use
#FF6B6B coral red
#2D3748 deep slate gray
#F6E05E warm yellow
#68D391 sage green

3. Text Citation

All copy intended to appear as text in the image must be enclosed in "double quotes".

  • Correct: a bold label reading "Step 1: Define the Problem"
  • Incorrect: a bold label reading Step 1: Define the Problem

This lets the image model distinguish between descriptive instructions and literal text to render.

4. Arrow Minimalism

Minimize the use of arrows. Prefer spatial proximity to imply flow and connection.

When arrows are necessary:

  • Specify exact start point and end point (e.g., "an arrow from the 'Input' box pointing to the 'Process' box")
  • Never use vague orientations like "a horizontal arrow" or "a vertical arrow"

5. Semantic Correspondence

Every icon, illustration, or decorative element must correspond semantically to the adjacent text content. Avoid generic decorative elements that could apply to any topic.

6. Punctuation Hygiene

Never use quotation marks when describing:

  • Style (e.g., write: flat design aesthetic — not: "flat design" aesthetic)
  • Layout structure (e.g., write: three-column grid — not: "three-column grid")
  • Colors or textures
  • Moods or feelings

Quotation marks are reserved exclusively for Rule 3: Text Citation.

7. Step Granularity

If the content contains stages, steps, or a sequence:

  • Detail every single step individually
  • Never merge or compress multiple steps into one
  • Each step gets its own visual element and label

8. Data & Encoding

All hard data from the source must be:

  • Preserved verbatim — no paraphrasing of numbers, dates, or proper nouns
  • Presented in a visually distinct format: bold text, labeled callout boxes, sticky notes, or data badges