Card-News Image Generator

Generate content images for card-news using nanobanana MCP. One tool (nanobanana), one output (16:9 editorial PNG files).

Purpose

Image Generator produces the visual assets that go into content-image card types. It:

• Receives image prompts from contents-manager

• Validates prompts against card-news image requirements

• Generates images via nanobanana MCP

• Saves output files for card-news-maker to embed

Memory Auto-Load Protocol

1. Load contents-manager output (Visual Asset Plan — provided as input) → Image prompts, aspect ratios, save paths
2. Read references/content-image-patterns.md → Prompt refinement patterns and style templates → If missing: use the built-in prompt formula in Step 1
3. Optional: Load card-news-memory/series-config.md → Color theme overrides → If missing: use default palette (white/black/yellow #fff3a0)
4. Optional: Load creative-memory/visual-guidelines.md (read-only) → If missing: use clean editorial style as default

필수 입력은 contents-manager output뿐이다. 나머지 파일 로드 실패 시 기본값으로 진행.

Input

Input Required Source

Visual Asset Plan Yes contents-manager output

Visual guidelines Recommended creative-memory/visual-guidelines.md

Style override Optional User preference

Process

Step 1: Prompt Review

For each image prompt from the Visual Asset Plan, verify:

Hard requirements checklist:

• Aspect ratio is 16:9

• Prompt explicitly states "no text"

• No watermark/logo instructions

• Subject is clearly described (not vague)

• Style direction is present (editorial, clean, etc.)

• Negative prompt includes standard exclusions

If any requirement is missing, add it before generation.

Step 2: Generate Images

Call nanobanana MCP generate_image for each prompt.

Generation parameters:

Parameter Value

Aspect ratio 16:9

Model auto (default) or pro for quality-critical images

Max attempts 3 per image

Generation sequence:

• Call generate_image with the reviewed prompt

• Evaluate the result:

• Subject clear and relevant to topic?

• No unintended text or artifacts?

• Color palette harmonious with card-news theme?

• Composition works at 946×576px (the embed area)?

• If result is unsatisfactory:

• Adjust prompt (add specificity, strengthen style directive)

• Retry (up to 3 attempts total)

• If still unsatisfactory after 3 attempts:

• Report to user with the best result + prompt used

• Suggest alternative approaches (different angle, different subject)

Quality checks per image:

• No text visible in the image

• No watermarks or logos

• Clean composition (not overly busy)

• Subject recognizable at card-news display size

• Colors don't clash with the white/black/yellow card-news theme

Step 3: Generate Outro Icon (if requested)

If the Visual Asset Plan includes an outro icon prompt:

• Generate using nanobanana with the specified prompt

• Target: simple, iconic, suitable for 180×140px display

• Style: clean illustration or icon, minimal detail

Step 4: Save Files

Save each generated image to the project output directory:

File naming convention:

[project]/card-news/[topic]-[YYYY-MM-DD]/img-card-[N].png

Outro icon:

[project]/card-news/[topic]-[YYYY-MM-DD]/outro-icon.png

Example:

card-news/ai-trends-2026-02-25/img-card-2.png card-news/ai-trends-2026-02-25/img-card-3.png card-news/ai-trends-2026-02-25/outro-icon.png

Step 5: Output Report

Image Generation Report: [Topic]

Date: [YYYY-MM-DD] Images generated: [N] All images: 16:9, no text, editorial style

Generated Images

Card [N] — [topic]

• File: [path]
• Prompt used: [final prompt]
• Model: [auto/pro/flash]
• Attempts: [N]
• Status: Success / Partial (notes)

[Repeat for each image]

Outro Icon

• File: [path]
• Status: [Generated / User-provided / Skipped]

Production Notes

• [Any quality concerns or user action needed]

nanobanana MCP Reference

Parameter Spec

Tool generate_image

Models Gemini 3 Pro (quality) / Gemini 2.5 Flash (speed)

Default model auto

Max resolution 4K (Pro) / 1024px (Flash)

Prompt limit 8,192 characters

What This Skill Does NOT Do

• Plan visual assets → contents-manager creates the prompts

• Write copy → copy-writer

• Render final cards → card-news-maker

• Edit or retouch images → out of scope

Image Generator stays focused: prompts in → PNG files out.