Nano Banana Image Generation & Editing

Multi-provider image generation and editing. Default provider: Tuzi (兔子API, api.tu-zi.com).

Script Directory

Agent Execution:

1. SKILL_DIR = this SKILL.md file's directory
2. Script path = ${SKILL_DIR}/scripts/main.ts

Usage

Run the script using absolute path (do NOT cd to skill directory first):

Generate new image:

npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "your image description" --filename "output.png" [--resolution 1K|2K|4K] [--provider tuzi|google|openai|dashscope|replicate] [--model MODEL_ID]

Edit existing image:

npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "editing instructions" --filename "output.png" --input-image "path/to/input.png" [--resolution 1K|2K|4K]

Important: Always run from the user's current working directory so images are saved where the user is working.

Default Workflow (draft → iterate → final)

Goal: fast iteration without burning time on 4K until the prompt is correct.

• Draft (1K): quick feedback loop
  • npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "<draft prompt>" --filename "yyyy-mm-dd-hh-mm-ss-draft.png" --resolution 1K
• Iterate: adjust prompt in small diffs; keep filename new per run
  • If editing: keep the same --input-image for every iteration until you're happy.
• Final (4K): only when prompt is locked
  • npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "<final prompt>" --filename "yyyy-mm-dd-hh-mm-ss-final.png" --resolution 4K

Options

Resolution Options

• 1K (default) - ~1024px resolution
• 2K - ~2048px resolution
• 4K - ~4096px resolution

Map user requests:

• No mention of resolution → 1K
• "low resolution", "1080", "1080p", "1K" → 1K
• "2K", "2048", "normal", "medium resolution" → 2K
• "high resolution", "high-res", "hi-res", "4K", "ultra" → 4K

Provider Selection

1. --provider specified → use it
2. --api-key provided (no --provider) → Google (direct Gemini API)
3. Only one API key available → use that provider
4. Multiple available → Tuzi first

Tuzi Models

Environment Variables

Load Priority: CLI --api-key > env vars > <cwd>/.tuzi-skills/.env > ~/.tuzi-skills/.env

Image Editing

When the user wants to modify an existing image:

1. Use --input-image parameter with the path to the image
2. The prompt should contain editing instructions
3. Resolution auto-detects from input image size if not specified

Prompt Handling

For generation: Pass user's image description as-is to --prompt. Only rework if clearly insufficient.

For editing: Pass editing instructions in --prompt (e.g., "add a rainbow in the sky")

Prompt Templates

• Generation: "Create an image of: <subject>. Style: <style>. Composition: <camera/shot>. Lighting: <lighting>. Background: <background>."
• Editing: "Change ONLY: <single change>. Keep identical: subject, composition, pose, lighting, color palette, background, text, and overall style."

Filename Generation

Pattern: yyyy-mm-dd-hh-mm-ss-name.png

• Timestamp: Current date/time in 24-hour format
• Name: Descriptive lowercase text with hyphens (1-5 words)

Preflight + Common Failures

• command -v npx (must exist)
• API key must be available (env or --api-key)
• If editing: input image must exist

Output

• Saves PNG to current directory (or specified path)
• Script outputs the full path to the generated image
• Do not read the image back - just inform the user of the saved path