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SKILL verified MIT Self-run

Nano Banana Pro

skill-marchatton-agent-skills-nano-banana-pro · by marchatton

Generate/edit images with Nano Banana Pro (Gemini 3 Pro Image). Use for image creation or modification incl logos, stickers, mockups, style transfer, multi-image composition, and multi-turn refinement.

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Install

$ agentstack add skill-marchatton-agent-skills-nano-banana-pro

✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

  • ✓ Prompt-injection patterns
  • ✓ Secret / credential exfiltration
  • ✓ Dangerous shell & filesystem operations
  • ✓ Untrusted network calls
  • ✓ Known-malicious package signatures

What it can access

  • ✓ Network access No
  • ✓ Filesystem access No
  • ✓ Shell / process execution No
  • ✓ Environment & secrets No
  • ✓ Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

View the full security report →

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Reliability & compatibility

✓ Security review passed
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Declared compatibility

Claude CodeClaude Desktop

Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.

Preview Execution monitoring

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About

Nano Banana Pro Image Generation & Editing

Quick Start

Generate:

uv run ~/.codex/skills/nano-banana-pro/scripts/generate_image.py --prompt "A serene Japanese garden" --filename "2025-11-23-14-23-05-japanese-garden.png" --resolution 1K

Edit:

uv run ~/.codex/skills/nano-banana-pro/scripts/generate_image.py --prompt "make the sky dramatic" --filename "2025-11-23-14-25-30-dramatic-sky.png" --input-image "original.png" --resolution 2K

Compose:

uv run ~/.codex/skills/nano-banana-pro/scripts/compose_images.py "Create a group photo" group.png person1.png person2.png

Multi-turn chat:

uv run ~/.codex/skills/nano-banana-pro/scripts/multi_turn_chat.py --model gemini-3-pro-image-preview --output-dir .

Scripts

  • generate_image.py: text-to-image + edit via --input-image, resolution 1K/2K/4K, optional --aspect, auto-detect resolution on edit.
  • edit_image.py: explicit edit CLI (input, instruction, output).
  • compose_images.py: combine up to 14 reference images.
  • multi_turn_chat.py: interactive refine session (/save, /load, /clear, /quit).
  • gemini_images.py: Python helper class.

Model

  • Default: gemini-3-pro-image-preview.
  • Only use other models if user asks.

Resolution + Aspect

  • Resolution: 1K default, 2K, 4K.
  • Aspect ratios (where supported): 1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9.
  • Map words: "1080/low/1K"->1K, "2K/2048/medium"->2K, "4K/high/ultra"->4K.

Workflow

  • Draft 1K, iterate small prompt diffs, final 4K.
  • For edits, keep same --input-image until final.

API Key

  • GEMINI_API_KEY required.
  • generate_image.py also supports --api-key.

Filenames

  • Pattern: yyyy-mm-dd-hh-mm-ss-name.png.
  • Lowercase, hyphenated, 1-5 words.

Output

  • Run from user cwd so files save there.
  • generate_image.py converts output to PNG.
  • Do not open/read images; report saved path.

Preflight

  • command -v uv
  • test -n "$GEMINI_API_KEY"
  • If editing: test -f "path/to/input.png"

Common Failures

  • No API key.
  • Input image missing/unreadable.
  • Quota/permission/403 errors.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

Install and usage instructions live in the source repository linked above.

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Versions

  • v0.1.0 Imported from the upstream source.

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