Skill

banana-illustration

Generates illustrations in flat vector, watercolor, line art, 3D clay render, pixel art, and isometric styles using Gemini API. Auto-detects style from context; triggers on illustration keywords.

Gemini

Python

Bash

design

ai-ml

npx claudepluginhub agentic-dev3o/devx-plugins --plugin nano-banana-ultimate

Tool Access

This skill is limited to using the following tools:

Bash(uv:*)Bash(ls:*)Read

Preview

**Input:** `$ARGUMENTS` (optional — subject and style description)

Supporting Assets

references/prompts.md

SKILL.md

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Stats

Parent Repo Stars10

Parent Repo Forks1

Last CommitApr 5, 2026

Actions

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Illustration Generator

Input: $ARGUMENTS (optional — subject and style description)

If $ARGUMENTS is provided, use it as the illustration brief and skip to prompt building. If empty, ask about subject and style.

Requirements

uv installed
GEMINI_API_KEY environment variable set (get one at https://aistudio.google.com/apikey)

Workflow

Understand — Parse the user's request. Identify the subject, narrative action, environment, and desired art style. If the style is ambiguous, ask ONE clarifying question or default to flat vector.
Build prompt — Apply the Prompt Formula below to construct a detailed, positive-framed illustration description.
Configure — Select aspect ratio and resolution from the Domain Defaults table.
Generate — Run the script.
Deliver — Report the saved file path. Do NOT read the image file back. Offer to iterate: swap style, adjust palette, or tweak composition.

Prompt Formula

[Subject/Character] + [Narrative Action] + [Illustrated Environment] + [Balanced Composition] + [Explicit Art Style]

Style Detection Rules

User Keywords	Resolved Style
"flat" / "vector"	Flat vector with solid fills, clean edges
"watercolor"	Wet-on-wet watercolor with paper texture, visible brushstrokes
"3D" / "clay"	Pixar-style clay render, soft shadows
"pixel"	Pixel art with visible grid, limited palette
"isometric"	Isometric projection, no perspective vanishing points
"line art" / "ink"	Consistent weight ink lines, minimal fills
Ambiguous	Default to flat vector

Domain Defaults

Domain	Aspect Ratio	Resolution
Spot / Icon	1:1	1K
Scene	4:3	1K

Generation

uv run "${CLAUDE_PLUGIN_ROOT}/scripts/banana.py" \
  --prompt "<detailed prompt following the formula>" \
  --output "<YYYY-MM-DD-HH-MM-SS-descriptive-name>.png" \
  --resolution 1K \
  --aspect-ratio <ratio from Domain Defaults> \
  --model gemini-3-pro-image-preview

Editing (with input images)

When the user provides an existing image to restyle or modify:

uv run "${CLAUDE_PLUGIN_ROOT}/scripts/banana.py" \
  --prompt "<edit instruction: what to change AND what to keep>" \
  --output "<YYYY-MM-DD-HH-MM-SS-descriptive-name>.png" \
  --input-image "/path/to/source.png" \
  --aspect-ratio <ratio>

For style transfers, describe the target style and what to preserve:

"Recreate this photograph as a flat vector illustration with a limited palette of teal, coral, and cream. Keep the composition, subject pose, and environment layout exactly the same."

Up to 14 input images can be passed (repeat --input-image for each).

References

See references/prompts.md for ready-to-use example prompts covering common illustration styles and scenarios.