By name: banana-illustration description: >- Generate illustrations in various styles — flat vector, watercolor, line art, 3D clay render, pixel art, and isometric. Auto-detects style from context. Triggers on: illustration, illustrate, flat design, watercolor, line art, pixel art, 3D illustration, isometric, sketch, cartoon, vector art, hand drawn. allowed-tools: Bash(uv:), Bash(ls:), Read
Illustration Generator
Input: $ARGUMENTS (optional — subject and style description)
If $ARGUMENTS is provided, use it as the illustration brief and skip to prompt building. If empty, ask about subject and style.
Requirements
uvinstalledGEMINI_API_KEYenvironment variable set (get one at https://aistudio.google.com/apikey)
Workflow
- Understand — Parse the user's request. Identify the subject, narrative action, environment, and desired art style. If the style is ambiguous, ask ONE clarifying question or default to flat vector.
- Build prompt — Apply the Prompt Formula below to construct a detailed, positive-framed illustration description.
- Configure — Select aspect ratio and resolution from the Domain Defaults table.
- Generate — Run the script.
- Deliver — Report the saved file path. Do NOT read the image file back. Offer to iterate: swap style, adjust palette, or tweak composition.
Prompt Formula
[Subject/Character] + [Narrative Action] + [Illustrated Environment] + [Balanced Composition] + [Explicit Art Style]
Style Detection Rules
| User Keywords | Resolved Style |
|---|---|
| "flat" / "vector" | Flat vector with solid fills, clean edges |
| "watercolor" | Wet-on-wet watercolor with paper texture, visible brushstrokes |
| "3D" / "clay" | Pixar-style clay render, soft shadows |
| "pixel" | Pixel art with visible grid, limited palette |
| "isometric" | Isometric projection, no perspective vanishing points |
| "line art" / "ink" | Consistent weight ink lines, minimal fills |
| Ambiguous | Default to flat vector |
Domain Defaults
| Domain | Aspect Ratio | Resolution |
|---|---|---|
| Spot / Icon | 1:1 | 1K |
| Scene | 4:3 | 1K |
Generation
uv run "${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.