diff --git a/Package.swift b/Package.swift
index 951e403..c7b72d9 100644
--- a/Package.swift
+++ b/Package.swift
@@ -17,7 +17,7 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/google-gemini/generative-ai-swift", from: "0.5.6"),
-        .package(url: "https://github.com/fumito-ito/FunctionCalling", from: "0.3.0"),
+        .package(url: "https://github.com/fumito-ito/FunctionCalling", from: "0.4.0"),
     ],
     targets: [
         // Targets are the basic building blocks of a package, defining a module or a test suite.
diff --git a/README.md b/README.md
index 766c2be..2df8c9b 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ let package = Package(
         )
     ],
     dependencies: [
-        .package(url: "https://github.com/FunctionCalling/FunctionCalling-GoogleGenerativeAI", from: "0.0.1")
+        .package(url: "https://github.com/FunctionCalling/FunctionCalling-GoogleGenerativeAI", from: "0.1.0")
     ]
 )
 ```
diff --git a/Sources/FunctionCalling-GoogleGenerativeAI/FunctionCalling_GoogleGenerativeAI.swift b/Sources/FunctionCalling-GoogleGenerativeAI/FunctionCalling_GoogleGenerativeAI.swift
index 900d24d..622b4d1 100644
--- a/Sources/FunctionCalling-GoogleGenerativeAI/FunctionCalling_GoogleGenerativeAI.swift
+++ b/Sources/FunctionCalling-GoogleGenerativeAI/FunctionCalling_GoogleGenerativeAI.swift
@@ -9,12 +9,10 @@ typealias FunctionCallingTool = FunctionCalling.Tool
 
 extension ToolContainer {
     public var googleGenerativeAITools: [GoogleGenerativeAI.Tool] {
-        get throws {
-            let data = allTools.data(using: .utf8)!
-            let functionCallingTools = try JSONDecoder().decode([FunctionCallingTool].self, from: data)
-            let googleGenerativeAITools = functionCallingTools.map { $0.toFunctionDeclaration }
-
-            return [GoogleGenerativeAI.Tool(functionDeclarations: googleGenerativeAITools)]
-        }
+        [
+            GoogleGenerativeAI.Tool(
+                functionDeclarations: allTools?.compactMap { $0.toFunctionDeclaration }
+            )
+        ]
     }
 }
diff --git a/Tests/FunctionCalling-GoogleGenerativeAITests/Extensions.swift b/Tests/FunctionCalling-GoogleGenerativeAITests/Extensions.swift
new file mode 100644
index 0000000..d32a38b
--- /dev/null
+++ b/Tests/FunctionCalling-GoogleGenerativeAITests/Extensions.swift
@@ -0,0 +1,24 @@
+//
+//  Extensions.swift
+//  FunctionCalling-GoogleGenerativeAI
+//
+//  Created by 伊藤史 on 2024/09/20.
+//
+
+@testable import GoogleGenerativeAI
+
+extension GoogleGenerativeAI.Tool {
+    var functions: [FunctionDeclaration]? {
+        self.functionDeclarations
+    }
+}
+
+extension GoogleGenerativeAI.FunctionDeclaration {
+    func getName() -> String {
+        self.name
+    }
+
+    func getDescription() -> String? {
+        self.description
+    }
+}
diff --git a/Tests/FunctionCalling-GoogleGenerativeAITests/FunctionCalling_ GoogleGenerativeAITests.swift b/Tests/FunctionCalling-GoogleGenerativeAITests/FunctionCalling_ GoogleGenerativeAITests.swift
index 6a4ccd6..f01bd2c 100644
--- a/Tests/FunctionCalling-GoogleGenerativeAITests/FunctionCalling_ GoogleGenerativeAITests.swift	
+++ b/Tests/FunctionCalling-GoogleGenerativeAITests/FunctionCalling_ GoogleGenerativeAITests.swift	
@@ -1,12 +1,38 @@
 import XCTest
 @testable import FunctionCalling_GoogleGenerativeAI
+import FunctionCalling
 
 final class FunctionCalling_GoogleGenerativeAITests: XCTestCase {
-    func testExample() throws {
-        // XCTest Documentation
-        // https://developer.apple.com/documentation/xctest
+    @FunctionCalling(service: .claude)
+    struct FunctionContainer {
+        /// Return current weather of location that passed by the argument
+        /// - Parameter location: location that I want to know how the weather
+        /// - Returns: string of weather
+        @CallableFunction
+        func getWeather(location: String) -> String {
+            return "Sunny"
+        }
 
-        // Defining Test Cases and Test Methods
-        // https://developer.apple.com/documentation/xctest/defining_test_cases_and_test_methods
+        @CallableFunction
+        func getStock(args: String) -> Int {
+            return 0
+        }
+    }
+
+    func testConvertedResults() throws {
+        guard let functions = FunctionContainer().googleGenerativeAITools.first?.functions else {
+            XCTFail("Conainer should contain some functions")
+            return
+        }
+
+        XCTAssertEqual(functions.count, 2)
+
+        let getWeather = try XCTUnwrap(functions.first)
+        XCTAssertEqual(getWeather.getName(), "getWeather")
+        XCTAssertEqual(getWeather.getDescription(), "Return current weather of location that passed by the argument- Parameter location: location that I want to know how the weather- Returns: string of weather")
+
+        let getStock = try XCTUnwrap(functions.last)
+        XCTAssertEqual(getStock.getName(), "getStock")
+        XCTAssertEqual(getStock.getDescription(), "")
     }
 }