diff --git a/README.md b/README.md
index 83aacb4..06a35f6 100644
--- a/README.md
+++ b/README.md
@@ -15,10 +15,14 @@ Windows Unity BatchBuild not provide Unity Build log StdOut option. This small t
 
 # Installation
 
-You can install as .NET Global Tool.
+You can install as .NET Global Tool or .NET Tool.
 
 ```sh
+# install as global tool
 dotnet tool install -g UnityBuildRunner
+
+# install to project's .config
+dotnet tool install UnityBuildRunner
 ```
 
 Or, you can install as nuget package library.
@@ -31,6 +35,8 @@ Install-Package UnityBuildRunner.Core
 
 ## CLI (Help)
 
+You can run installed tool via `UnityBuildRunner` (.NET Global Tool) or `dotnet UnityBuildRunner` (.NET Tool) command.
+
 ```
 $ UnityBuildRunner --help
 Usage: UnityBuildRunner [options...]
@@ -53,25 +59,35 @@ All you need to do is pass unity's path as `-u UnityPath` and leave other argmen
 If you are running Unity batch build like this.
 
   ```sh
-  "C:\Program Files\Unity\Hub\Editor\2022.3.3f1\Editor\Unity.exe" -quit -batchmode -buildTarget "WindowsStoreApps" -projectPath "C:\git\MRTKSample\Unity" -logfile "log.log" -executeMethod HoloToolkit.Unity.HoloToolkitCommands.BuildSLN"
+  $ "C:\Program Files\Unity\Hub\Editor\2022.3.3f1\Editor\Unity.exe" -quit -batchmode -buildTarget "WindowsStoreApps" -projectPath "C:\git\MRTKSample\Unity" -logfile "log.log" -executeMethod "HoloToolkit.Unity.HoloToolkitCommands.BuildSLN"
   ```
 
-Then, append `UnityBuildRunner --unity-path <UnityPath>` to existing command, that's all.
+Then, append `UnityBuildRunner --unity-path <UnityPath>` or `dotnet UnityBuildRunner --unity-path <UnityPath>` to existing command, that's all.
 
   ```sh
-  UnityBuildRunner --unity-path "C:\Program Files\Unity\Hub\Editor\2022.3.3f1\Editor\Unity.exe" -quit -batchmode -buildTarget "WindowsStoreApps" -projectPath "C:\git\MRTKSample\Unity" -logfile "log.log" -executeMethod HoloToolkit.Unity.HoloToolkitCommands.BuildSLN"
+  # .NET Global Tool
+  $ UnityBuildRunner --unity-path "C:\Program Files\Unity\Hub\Editor\2022.3.3f1\Editor\Unity.exe" -quit -batchmode -buildTarget "WindowsStoreApps" -projectPath "C:\git\MRTKSample\Unity" -logfile "log.log" -executeMethod "HoloToolkit.Unity.HoloToolkitCommands.BuildSLN"
+
+  # .NET Tool
+  $ UnityBuildRunner --unity-path "C:\Program Files\Unity\Hub\Editor\2022.3.3f1\Editor\Unity.exe" -quit -batchmode -buildTarget "WindowsStoreApps" -projectPath "C:\git\MRTKSample\Unity" -logfile "log.log" -executeMethod "HoloToolkit.Unity.HoloToolkitCommands.BuildSLN"
   ```
 
 > **Note**: Another way to specifying UnityPath is via Environment Variable `UnityPath`.
 
   ```sh
-  set UnityPath=C:\Program Files\Unity\Hub\Editor\2022.3.3f1\Editor\Unity.exe
-  UnityBuildRunner -quit -batchmode -buildTarget "WindowsStoreApps" -projectPath "C:\git\MRTKSample\Unity" -logfile "log.log" -executeMethod "HoloToolkit.Unity.HoloToolkitCommands.BuildSLN"
+  # Environment Variables
+  $ set UnityPath=C:\Program Files\Unity\Hub\Editor\2022.3.3f1\Editor\Unity.exe
+
+  # .NET Global Tool
+  $ UnityBuildRunner -quit -batchmode -buildTarget "WindowsStoreApps" -projectPath "C:\git\MRTKSample\Unity" -logfile "log.log" -executeMethod "HoloToolkit.Unity.HoloToolkitCommands.BuildSLN"
+
+  # .NET Tool
+  $ dotnet UnityBuildRunner -quit -batchmode -buildTarget "WindowsStoreApps" -projectPath "C:\git\MRTKSample\Unity" -logfile "log.log" -executeMethod "HoloToolkit.Unity.HoloToolkitCommands.BuildSLN"
   ```
 
 ## Library (Basic)
 
-You can use this library as your tool chain.
+You can use as Library as well. This is sample code to run Unity Build.
 
 ```csharp
 // Parse settings from argument
diff --git a/src/UnityBuildRunner.Core/DefaultBuilder.cs b/src/UnityBuildRunner.Core/DefaultBuilder.cs
index 74637d1..faf6ba3 100644
--- a/src/UnityBuildRunner.Core/DefaultBuilder.cs
+++ b/src/UnityBuildRunner.Core/DefaultBuilder.cs
@@ -14,13 +14,6 @@ public interface IBuilder
     /// </summary>
     public int ExitCode { get; }
     /// <summary>
-    /// Initialize Builder before build.
-    /// </summary>
-    /// <param name="logFilePath"></param>
-    /// <param name="ct"></param>
-    /// <returns></returns>
-    Task InitializeAsync(string logFilePath, CancellationToken ct);
-    /// <summary>
     /// Run build.
     /// </summary>
     /// <param name="ct"></param>
@@ -32,7 +25,7 @@ public class DefaultBuilder : IBuilder
 {
     private readonly ISettings settings;
     private readonly ILogger logger;
-    private readonly IErrorFilter? errorFilter;
+    private readonly IErrorFilter errorFilter;
     private BuildErrorCode buildErrorCode = BuildErrorCode.Success;
 
     public int ExitCode { get; private set; }
@@ -106,13 +99,13 @@ public async Task BuildAsync(CancellationToken ct = default)
                 // read logs and redirect to stdout
                 while (!process.HasExited)
                 {
-                    ReadLog(reader);
+                    ReadAndFilterLog(reader, errorFilter);
                     await Task.Delay(TimeSpan.FromMilliseconds(500), ct).ConfigureAwait(false);
                 }
 
                 // read last log
                 await Task.Delay(TimeSpan.FromMilliseconds(500), ct).ConfigureAwait(false);
-                ReadLog(reader);
+                ReadAndFilterLog(reader, errorFilter);
             }
 
             // respect unity's exitcode
@@ -170,7 +163,7 @@ public async Task BuildAsync(CancellationToken ct = default)
         }
     }
 
-    public async Task InitializeAsync(string logFilePath, CancellationToken ct)
+    private async Task InitializeAsync(string logFilePath, CancellationToken ct)
     {
         await AssumeLogFileInitialized(logFilePath, ct).ConfigureAwait(false);
     }
@@ -182,35 +175,30 @@ public async Task InitializeAsync(string logFilePath, CancellationToken ct)
     /// <returns></returns>
     private async Task AssumeLogFileInitialized(string logFilePath, CancellationToken ct)
     {
-        try
+        if (!File.Exists(logFilePath))
+        {
+            return;
+        }
+        var retry = 10; // retry 10 times
+        for (var i = 1; i <= retry; i++)
         {
-            if (!File.Exists(logFilePath))
+            ct.ThrowIfCancellationRequested();
+
+            try
             {
-                return;
+                File.Delete(logFilePath);
+                break;
             }
-            var retry = 10; // retry 10 times
-            for (var i = 1; i <= retry; i++)
+            catch (IOException) when (i < retry + 1)
             {
-                try
-                {
-                    File.Delete(logFilePath);
-                    break;
-                }
-                catch (IOException) when (i < retry + 1)
-                {
-                    logger.LogWarning($"Couldn't delete file {logFilePath}, retrying... ({i + 1}/{retry})");
-                    await Task.Delay(TimeSpan.FromSeconds(1), ct).ConfigureAwait(false);
-                    continue;
-                }
+                logger.LogWarning($"Couldn't delete file {logFilePath}, retrying... ({i + 1}/{retry})");
+                await Task.Delay(TimeSpan.FromSeconds(1), ct).ConfigureAwait(false);
+                continue;
             }
         }
-        catch (OperationCanceledException)
-        {
-            // no error on CancellationToken cancel.
-        }
     }
 
-    private void ReadLog(StreamReader reader)
+    private void ReadAndFilterLog(StreamReader reader, IErrorFilter errorFilter)
     {
         var txt = reader.ReadToEnd();
         if (string.IsNullOrEmpty(txt))
@@ -221,7 +209,7 @@ private void ReadLog(StreamReader reader)
         // Output current log.
         logger.LogInformation(txt);
 
-        // Cancel when error message found.
-        errorFilter?.Filter(txt, result => throw new BuildErrorFoundException($"Error filter caught error.", result.MatchPattern, result.MatchPattern));
+        // Exception when error message found.
+        errorFilter.Filter(txt, result => throw new BuildErrorFoundException($"Error filter caught error.", result.MatchPattern, result.MatchPattern));
     }
 }