Gemini Image Analysis (Bun + TypeScript)

When to use

Use this Skill when you need to analyze one or multiple images (screenshots, photos, diagrams) with Gemini Flash via the REST API.

Quick start

GEMINI_API_KEY="YOUR_KEY" \
bun .claude/skills/gemini-image-analysis/scripts/gemini-image-analyze.ts \
  --prompt "Caption this image." \
  /path/to/image.jpg

macOS Keychain (optional)

If you store GEMINIAPIKEY in the macOS Keychain:

GEMINI_API_KEY="$(security find-generic-password -a "$(whoami)" -s "GEMINI_API_KEY" -w)" \
bun .claude/skills/gemini-image-analysis/scripts/gemini-image-analyze.ts \
  --prompt "Caption this image." \
  /path/to/image.jpg

Multiple images

Send multiple images in one request (useful for comparison or “before/after”):

GEMINI_API_KEY="YOUR_KEY" \
bun .claude/skills/gemini-image-analysis/scripts/gemini-image-analyze.ts \
  --prompt "Compare these images and describe the differences." \
  /path/to/image1.jpg \
  /path/to/image2.png

Options

• --prompt <text>: Text instruction for the model (default: Caption this image.)
• --model <model>: Model name (default: gemini-3-flash-preview)
• --json: Print the full JSON response instead of extracted text

Notes

• The script reads GEMINIAPIKEY from the environment and never stores it.
• Supported image types: .jpg, .jpeg, .png, .webp, .gif.