nanobanana-image

name	nanobanana-image
description	Generate slide images with Gemini, save them under the target deck assets directory, and insert them into MDX. Use when the user explicitly asks for Gemini, Nanobanana, or the existing Gemini script workflow, or when a deck is already standardized on Gemini-generated imagery. For provider-ambiguous image requests, use image-provider first so the user can choose GPT/Codex or Gemini/Nanobanana.

Nanobanana Image

Generate images for Amaroad slides and insert them into MDX.

Use When

• The user asks for Gemini or Nanobanana image generation
• The user asks to use the existing Gemini script workflow
• A deck is already standardized on Gemini-generated imagery
• A concept visual should be added directly into an MDX slide

Prerequisites

• GEMINI_API_KEY is set in .env.local

Provider Boundary

• If the user has not chosen Gemini/Nanobanana, stop and use image-provider before generating.

Workflow

1. Gather deck, slide, image concept, and preferred filename
2. Determine aspect ratio
   • Respect an explicit user choice first
   • Otherwise inspect the target slide layout and choose a suitable ratio

pnpm exec tsx .codex/skills/nanobanana-image/scripts/capture-slide.ts \
  --deck <deck-name> \
  --slide <0-indexed> \
  --output /tmp/slide-capture.png

3. Explain the chosen aspect ratio briefly before generation
4. Build an English image prompt suited for slide usage
   • Add composition, style, lighting, and contrast guidance
   • Avoid putting heading text inside the image unless explicitly requested
5. Show the prompt to the user before generation
6. Generate the image

pnpm exec tsx .codex/skills/nanobanana-image/scripts/generate-image.ts \
  --prompt "<optimized prompt>" \
  --output "decks/<deck>/assets/<filename>.png" \
  --aspect-ratio <ratio> \
  --resolution <resolution>

7. Insert the generated asset into the target MDX slide
8. Report the asset path, prompt, and insertion location

Notes

• Use relative asset paths like ./assets/<filename>.png in MDX.
• Default resolution is 2K unless the user requests otherwise.