NanoBanana MCP

Instructions

Implementation Reference

• src/index.ts:1035-1062 (handler)

  Handler implementation for the 'set_model' tool. It updates the `selectedModel` property in the session context.

  case "set_model": {
    const { model, conversation_id = "default" } = args as any;
  
    const modelMap: Record<string, ModelOption> = {
      "flash": "gemini-3.1-flash-image-preview",
      "pro": "gemini-3-pro-image-preview",
    };
  
    if (!modelMap[model]) {
      return {
        content: [{
          type: "text",
          text: `Invalid model: ${model}. Use 'flash' or 'pro'.`,
        }],
        isError: true,
      };
    }
  
    const context = getOrCreateContext(conversation_id);
    context.selectedModel = modelMap[model];
  
    return {
      content: [{
        type: "text",
        text: `✓ Model set to ${model} (${modelMap[model]}) for session: ${conversation_id}`,
      }],
    };
  }

• src/index.ts:441-458 (registration)

  Tool registration definition for 'set_model' including input schema.

    name: "set_model",
    description: "Set the Gemini model for this session. 'flash' for faster generation (default), 'pro' for higher quality.",
    inputSchema: {
      type: "object",
      properties: {
        model: {
          type: "string",
          enum: ["flash", "pro"],
          description: "Model to use: 'flash' (gemini-3.1-flash-image-preview) or 'pro' (gemini-3-pro-image-preview)",
        },
        conversation_id: {
          type: "string",
          description: "Session ID to apply this setting to (default: 'default')",
        },
      },
      required: ["model"],
    },
  },