// Gemini用の変換関数
func ConvertAIToolsToGemini(aiTools []aitool.ToolDefinition) []*genai.Tool {
    functionDeclarations := make([]*genai.FunctionDeclaration, 0, len(aiTools))
    
    for _, aiTool := range aiTools {
        funcDecl := &genai.FunctionDeclaration{
            Name:        aiTool.Name,
            Description: aiTool.Description,
            Parameters: &genai.Schema{
                Type:       genai.TypeObject,
                Properties: make(map[string]*genai.Schema),
                Required:   []string{},
            },
        }
        
        // パラメータを変換
        for name, param := range aiTool.Parameters {
            var schemaType genai.Type
            switch param.Type {
            case "string":
                schemaType = genai.TypeString
            case "integer", "number":
                schemaType = genai.TypeNumber
            case "boolean":
                schemaType = genai.TypeBoolean
            }
            
            funcDecl.Parameters.Properties[name] = &genai.Schema{
                Type:        schemaType,
                Description: param.Description,
            }
            
            if param.Required {
                funcDecl.Parameters.Required = append(funcDecl.Parameters.Required, name)
            }
        }
        
        functionDeclarations = append(functionDeclarations, funcDecl)
    }
    
    // 全ての関数宣言を1つのToolオブジェクトにまとめる
    return []*genai.Tool{{FunctionDeclarations: functionDeclarations}}
}