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generate-image

Generate images using nano-banana-2 MCP tools with best-practice prompting. Use this skill when the user asks to create, generate, or edit images.

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Works withGemini
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  • SKILL.md3.5 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Image Generation with Nano Banana 2

Use the generate_image, edit_image, and continue_editing MCP tools from the nano-banana-2 server.

First-Time Setup

Before generating images, verify the API key is configured:

  1. Call get_configuration_status to check if GEMINI_API_KEY is set.
  2. If the key is missing, instruct the user to add it to their MCP server environment configuration:
    • In Claude Code settings or .claude/settings.json, add GEMINI_API_KEY to the server's env block.
    • The key can be obtained from Google AI Studio.

Prompting Best Practices

Write narrative paragraphs, NOT comma-separated keyword lists. Narrative prompts achieve ~94% coherence vs ~61% for keyword lists.

  1. Start with image type: "Create an educational diagram showing...", "Generate a photorealistic photograph of...", "Design a flat-style icon depicting..."
  2. Keep text in images short (<25 characters). Quote text exactly and describe font style.
  3. Specify layout explicitly: side-by-side, top-to-bottom steps, centered with border, etc.
  4. Skip quality boosters like "4k masterpiece", "highly detailed", "award-winning" — they add noise, not quality.
  5. Be specific about what you want, not what you don't want. Positive descriptions work better than negations.

Defaults

  • resolution: "1K" — good balance of quality and speed. Use "2K" or "4K" for print or detail-heavy images.
  • aspectRatio: "1:1" — change to "16:9" for landscapes/banners, "9:16" for mobile/portrait.
  • thinking: "minimal" — use "high" for complex scenes with spatial relationships or text rendering.
  • returnInlineImage: Consider setting to false in Claude Code to avoid context window overflow. The image is still saved to disk and can be viewed by the user.
  • outputMimeType: "image/png" for quality, "image/jpeg" for smaller files.
  • numberOfImages: 1 — use 2-4 when exploring variations.

Workflow

  1. Generate: Use generate_image with a well-crafted narrative prompt.
  2. Review: Check the saved file path in the response.
  3. Refine: Use continue_editing to make adjustments. Be specific about what to change.
  4. Iterate: Each continue_editing call builds on the previous result.

Style Guidance

  • Diagrams: Specify colors, label positions, arrow directions. Use thinking: "high" for complex layouts.
  • Illustrations: Describe art style (flat, watercolor, line art), mood, and lighting.
  • Infographics: Use numbered lists cautiously (>8 sequential items are unreliable). Numbers-only approach works best for long lists.
  • Photos: Describe camera angle, lighting conditions, depth of field, and subject positioning.

Context Window Management

When generating images in Claude Code, set returnInlineImage: false to prevent base64 image data from filling the context window. The image is still saved to disk — just tell the user where to find it.

🔗 Связи

  • [[MOC - MCP Servers]] — mcp-servers
  • [[000 - Map of Maps]] — Map of Maps

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