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Generate flat favicons from image prompts, then key out a magenta background and build PNG/ICO/WebP outputs with ImageMagick.
Passed 18 of 21 test cases with the skill, and 8 of 21 without it.
and 10 more in the full report
11 fixed9 passed either way3 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 11 test cases the skill fixed. Same model, same prompt, with and without the skill.
Show the JSON object structure for including the 192x192 PNG icon inside a web manifest's icons array.
| Checked | Without skill | With skill |
|---|---|---|
| The JSON object contains {"src": "/favicon-192.png", "sizes": "192x192", "type": "image/png"}. | Missed | Passed |
The instructions your model reads when the skill loads.
Create clean, flat favicons with a transparent background. Generate a base PNG on a solid magenta background, remove the magenta with ImageMagick, then export favicon.ico, PNG sizes, Apple touch icon, and WebP.
uvmagick (ImageMagick)GEMINI_API_KEY setUse a solid magenta background so it can be keyed out later. Keep the icon flat and simple so it reads at 16×16.
Favicon icon, 1:1 square, solid magenta #FF00FF background. Simple flat vector icon of: <subject>. Bold geometric shapes, solid fills, no gradients, no shadows. Centered, fills 75–85% of frame. Do not use magenta in the icon.
Use the Nano Banana Pro skill to generate the PNG. Run from your project directory so outputs land where you need them.
Example (update the path for your agent):
~/.codex/skills/nano-banana-pro/scripts/generate_image.py~/.claude/skills/nano-banana-pro/scripts/generate_image.py~/.pi/agent/skills/nano-banana-pro/scripts/generate_image.pyuv run <nanoBananaDir>/scripts/generate_image.py \
--prompt "<your prompt>" \
--filename "yyyy-mm-dd-hh-mm-ss-favicon.png" \
--resolution 1K
Iterate at 1K, then re-run at 2K/4K only when the prompt is locked.
Run the script from this skill:
test cases passed, vs 8 / 21 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.