muapi-nano-banana

Original source / Raw SKILL.md

---
name: muapi-nano-banana
version: 0.1.0
description: Reasoning-driven image generation using structured creative briefs (Gemini 3 style) — generates high-fidelity images via muapi.ai with logic-based prompting
---

# 🍌 Nano-Banana Expert Skill (Gemini 3 Style)

**A specialized skill for AI Agents to leverage "Reasoning-Driven" image generation.**
Based on the advanced prompting architecture of Google's Gemini 3 (Nano Banana Pro), this skill moves beyond keyword stuffing to structured, logic-based creative briefs.

## Core Competencies

1. **Reasoning-Driven Prompting**: Using natural language logic to define physics, lighting, and spatial relationships.
2. **Structured Creative Briefs**: Implementing the "Perfect Prompt" formula: `Subject + Action + Context + Composition + Lighting`.
3. **Text Rendering Precision**: Explicitly defining typography and signifiers for legible text integration.
4. **Contextual Grounding**: Using "Search Grounding" logic (simulated) to anchor generations in real-world accuracy.

---

## 🏗️ Technical Specification

### 1. The "Perfect Prompt" Formula

| Component | Description | Example |
| :--- | :--- | :--- |
| **Subject** | Detailed entity description | "A stoic robot barista with exposed copper wiring" |
| **Action** | Dynamic interaction | "Pouring a latte art leaf with mechanical precision" |
| **Context** | Environment & Atmosphere | "Inside a neon-lit cyberpunk cafe at midnight" |
| **Composition** | Camera & Lens choice | "Close-up, 85mm lens, f/1.8 aperture" |
| **Lighting** | Mood & Direction | "Volumetric blue rim light, warm cafe glow" |
| **Style** | Aesthetic anchor | "Cinematic, photorealistic, 4K production value" |

### 2. Advanced Features
- **Negative Constraint Logic**: Instead of "no blurry," use "Ensure sharp focus on the subject's eyes."
- **Identity Consistency**: (Simulated) "Maintain consistent facial structure across variations."
- **Text Integration**: Use double quotes for specific text: `The sign reads "OPEN 24/7"`.

---

## 🧠 Prompt Optimization Protocol (Agent Instruction)

**Before calling the script, the Agent MUST rewrite the user's prompt into a logic-driven Reasoning Brief:**

1. **NO KEYWORD SOUP**: Remove "8k, masterpiece, ultra-detailed." Use full, descriptive sentences.
2. **PHYSICAL CONSISTENCY**: Describe how elements interact (e.g., "The light from the crystal shards casts caustic patterns across the obsidian floor").
3. **TEXT PRECISION**: If the user wants text, define it precisely: `featuring a sign that says "STORE NAME" in a weathered serif font`.
4. **OPTICAL DIRECTIVES**: Specify lens behavior: *Shallow Depth of Field (f/1.8)*, *Macro Lens*, *Anamorphic Flare*.

---

## 🚀 Protocol: Using Nano-Banana

### Step 1: Define the Creative Logic
Provide the agent with a subject and a specific scenario.

### Step 2: Invoke the Script
The `generate-nano-art.sh` script translates the logic into a structured Gemini 3-style prompt.

```bash
# Generating a reasoning-driven image
bash scripts/generate-nano-art.sh \
  --subject "a glass chess piece" \
  --action "shattering into liquid shards" \
  --context "on a obsidian table" \
  --style "macro photography"
```

---

## ⚠️ Constraints & Guardrails

- **No Keyword Soup**: **MANDATORY** - Do not use "trending on artstation, masterpiece, 8k". Use natural language descriptions.
- **Physics Logic**: Ensure the prompt describes *physically possible* lighting and reflection interactions.
- **Full Sentences**: The model parses relationships; use "light reflecting off the water" instead of "water, reflection".

---

## ⚙️ Implementation Details
This skill applies a "Logic Wrapper" around the `core/media/generate-image.sh` primitive, converting fragmented inputs into a coherent, reasoning-ready narrative prompt.


---

## Referenced Files

> The following files are referenced in this skill and included for context.

### scripts/generate-nano-art.sh

```bash
#!/bin/bash
# Expert Skill: Nano-Banana (Gemini 3 Style)
# Implements the "Perfect Prompt" reasoning-driven formula.

SUBJECT=""
ACTION=""
CONTEXT=""
STYLE="cinematic"
LIGHTING="natural"
RESOLUTION="1k"
TEXT=""
VIEW_FLAG=""

while [[ $# -gt 0 ]]; do
    case $1 in
        --subject) SUBJECT="$2"; shift 2 ;;
        --action) ACTION="$2"; shift 2 ;;
        --context) CONTEXT="$2"; shift 2 ;;
        --style) STYLE="$2"; shift 2 ;;
        --lighting) LIGHTING="$2"; shift 2 ;;
        --resolution) RESOLUTION="$2"; shift 2 ;;
        --text) TEXT="$2"; shift 2 ;;
        --view) VIEW_FLAG="--view"; shift ;;
        *) shift ;;
    esac
done

if [ -z "$SUBJECT" ]; then
    echo "Usage: bash generate-nano-art.sh --subject 'robot' [--action 'pouring coffee'] [--context 'cafe'] [--style 'photorealistic'] [--resolution 1k|2k|4k] [--text 'CAFE'] [--view]"
    exit 1
fi

# Text Logic
TEXT_PROMPT=""
if [ -n "$TEXT" ]; then
    TEXT_PROMPT="featuring a sign that clearly reads \"$TEXT\" in bold typography"
fi

# Nano-Banana Reasoning-Driven Prompt
# Formula: Subject + Action + Context + Lighting + Style + Text
EXPERT_PROMPT="[REASONING_BRIEF]
SUBJECT: A highly detailed $SUBJECT.
ACTION: The subject is $ACTION.
ENVIRONMENT: Situated in $CONTEXT.
LIGHTING: Illuminated by $LIGHTING lighting.
STYLE: Use a $STYLE aesthetic. High fidelity, physically accurate reflections and textures.
EXTRA: $TEXT_PROMPT.
[EXECUTE] Generate a photorealistic image based on this logic. Ensure precise composition and lighting interactions."

# Call Core Primitive
SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
CORE_SCRIPT="$SCRIPT_DIR/../../../../core/media/generate-image.sh"

bash "$CORE_SCRIPT" --prompt "$EXPERT_PROMPT" --model "nano-banana-pro" --resolution "$RESOLUTION" $VIEW_FLAG --json

```