NanoBanana MCP

Instructions

Implementation Reference

• src/index.ts:1010-1033 (handler)

  The implementation of the set_aspect_ratio tool handler, which validates the aspect ratio and updates the context for a given conversation.

  case "set_aspect_ratio": {
    const { aspect_ratio, conversation_id = "default" } = args as any;
  
    // Validate aspect ratio
    if (!VALID_ASPECT_RATIOS.includes(aspect_ratio as AspectRatio)) {
      return {
        content: [{
          type: "text",
          text: `Invalid aspect ratio: ${aspect_ratio}. Valid: ${VALID_ASPECT_RATIOS.join(", ")}`,
        }],
        isError: true,
      };
    }
  
    const context = getOrCreateContext(conversation_id);
    context.aspectRatio = aspect_ratio as AspectRatio;
  
    return {
      content: [{
        type: "text",
        text: `✓ Aspect ratio set to ${aspect_ratio} for session: ${conversation_id}\nThis will apply to both image generation and editing.`,
      }],
    };
  }

• src/index.ts:422-435 (registration)

  Registration of the set_aspect_ratio tool, including its description and input schema definition.

  name: "set_aspect_ratio",
  description: "Set the aspect ratio for subsequent image generation and editing in this session. Must be called before generating/editing images if a specific ratio is desired.",
  inputSchema: {
    type: "object",
    properties: {
      aspect_ratio: {
        type: "string",
        enum: [...VALID_ASPECT_RATIOS],
        description: "The aspect ratio to use for image generation/editing",
      },
      conversation_id: {
        type: "string",
        description: "Session ID to apply this setting to (default: 'default')",
      },