diff --git a/README.ko.md b/README.ko.md
index 104234a..5637d40 100644
--- a/README.ko.md
+++ b/README.ko.md
@@ -203,12 +203,13 @@ unity-cli console --clear
 
 가장 강력한 명령어입니다. Unity Editor 런타임에서 임의의 C# 코드를 실행합니다. UnityEngine, UnityEditor, ECS 및 로드된 모든 어셈블리에 접근 가능합니다. 일회성 조회나 수정을 위해 커스텀 도구를 만들 필요가 없습니다.
 
-`return`으로 결과를 받습니다. 주요 namespace는 기본 포함. 프로젝트 전용 타입(예: `Unity.Entities`)만 `--usings`로 추가합니다.
+`return`으로 결과를 받습니다. 주요 namespace는 기본 포함. 프로젝트 전용 타입(예: `Unity.Entities`)만 `--usings`로 추가합니다. `--usings`는 콤마로 여러 namespace를 받을 수 있고 반복 지정도 가능합니다.
 
 ```bash
 unity-cli exec "return Application.dataPath;"
 unity-cli exec "return EditorSceneManager.GetActiveScene().name;"
 unity-cli exec "return World.All.Count;" --usings Unity.Entities
+unity-cli exec "return World.All.Count;" --usings Unity.Entities --usings Unity.Mathematics
 
 # stdin으로 파이프하면 shell escaping 문제 없음
 echo 'Debug.Log("hello"); return null;' | unity-cli exec
diff --git a/README.md b/README.md
index 8a3b920..17533af 100644
--- a/README.md
+++ b/README.md
@@ -203,12 +203,13 @@ unity-cli console --clear
 
 Run arbitrary C# code inside the Unity Editor at runtime. This is the most powerful command — it gives you full access to UnityEngine, UnityEditor, ECS, and every loaded assembly. No need to write a custom tool for one-off queries or mutations.
 
-Use `return` to get output. Common namespaces are included by default. Add `--usings` only for project-specific types (e.g. `Unity.Entities`). The csc compiler and dotnet runtime are auto-detected; if detection fails, specify manually with `--csc <path>` or `--dotnet <path>`.
+Use `return` to get output. Common namespaces are included by default. Add `--usings` only for project-specific types (e.g. `Unity.Entities`). `--usings` accepts comma-separated namespaces and can be repeated. The csc compiler and dotnet runtime are auto-detected; if detection fails, specify manually with `--csc <path>` or `--dotnet <path>`.
 
 ```bash
 unity-cli exec "return Application.dataPath;"
 unity-cli exec "return EditorSceneManager.GetActiveScene().name;"
 unity-cli exec "return World.All.Count;" --usings Unity.Entities
+unity-cli exec "return World.All.Count;" --usings Unity.Entities --usings Unity.Mathematics
 
 # Pipe via stdin to avoid shell escaping issues
 echo 'Debug.Log("hello"); return null;' | unity-cli exec
diff --git a/cmd/root.go b/cmd/root.go
index f825c10..1e83b68 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -333,34 +333,41 @@ func buildParams(args []string, base map[string]interface{}) (map[string]interfa
 	}
 
 	var positional []string
-	flags := map[string]string{}
+	flags := map[string][]string{}
 	for i := 0; i < len(args); i++ {
 		a := args[i]
 		if strings.HasPrefix(a, "--") {
 			key := a[2:]
 			if i+1 < len(args) && !strings.HasPrefix(args[i+1], "--") {
-				flags[key] = args[i+1]
+				flags[key] = append(flags[key], args[i+1])
 				i++
 			} else {
-				flags[key] = "true"
+				flags[key] = append(flags[key], "true")
 			}
 		} else {
 			positional = append(positional, a)
 		}
 	}
 
-	if raw, ok := flags["params"]; ok {
+	if values, ok := flags["params"]; ok && len(values) > 0 {
+		raw := values[len(values)-1]
 		if jsonErr := json.Unmarshal([]byte(raw), &params); jsonErr != nil {
 			return nil, fmt.Errorf("invalid JSON in --params: %w", jsonErr)
 		}
 	}
-	for k, v := range flags {
+	for k, values := range flags {
 		if k == "params" {
 			continue
 		}
 		if _, exists := params[k]; exists {
 			continue
 		}
+		if k == "usings" {
+			params[k] = normalizeUsings(values)
+			continue
+		}
+
+		v := values[len(values)-1]
 		if n, err := strconv.Atoi(v); err == nil {
 			params[k] = n
 		} else if v == "true" {
@@ -379,6 +386,22 @@ func buildParams(args []string, base map[string]interface{}) (map[string]interfa
 	return params, nil
 }
 
+func normalizeUsings(values []string) []string {
+	var result []string
+	seen := map[string]bool{}
+	for _, value := range values {
+		for _, item := range strings.Split(value, ",") {
+			using := strings.TrimSpace(item)
+			if using == "" || seen[using] {
+				continue
+			}
+			seen[using] = true
+			result = append(result, using)
+		}
+	}
+	return result
+}
+
 func rejectRemovedFlags(args []string) error {
 	for _, arg := range args {
 		if arg == "--port" || strings.HasPrefix(arg, "--port=") {
@@ -450,7 +473,7 @@ Console:
 Execute C#:
   exec "<code>"                 Run C# code in Unity (return required for output)
   echo '<code>' | exec          Pipe code via stdin (avoids shell escaping)
-  exec "<code>" --usings x,y    Add extra using directives
+  exec "<code>" --usings x,y    Add extra using directives (repeatable)
 
   Examples:
     exec "Time.time"
@@ -573,7 +596,7 @@ UnityEditor, and all loaded assemblies.
 Use 'return' to get output. Add --usings for types outside default namespaces.
 
 Options:
-  --usings <ns1,ns2>   Add extra using directives
+  --usings <ns1,ns2>   Add extra using directives (comma-separated or repeatable)
   --csc <path>         Path to csc compiler (csc.dll or csc.exe). Auto-detected if omitted.
   --dotnet <path>      Path to dotnet runtime. Auto-detected if omitted.
 
@@ -588,10 +611,11 @@ Examples:
   echo 'return EditorSceneManager.GetActiveScene().name;' | unity-cli exec
   echo 'Debug.Log("hello"); return null;' | unity-cli exec
   unity-cli exec "return World.All.Count;" --usings Unity.Entities
+  unity-cli exec "return World.All.Count;" --usings Unity.Entities --usings Unity.Mathematics
 
 Stdin:
   Pipe code via stdin to avoid shell escaping issues.
-  echo '<code>' | unity-cli exec [--usings ns1,ns2]
+  echo '<code>' | unity-cli exec [--usings ns1,ns2] [--usings ns3]
 
 Notes:
   - Use 'return' for output, 'return null;' for void operations
diff --git a/cmd/root_test.go b/cmd/root_test.go
index 94822a7..5670474 100644
--- a/cmd/root_test.go
+++ b/cmd/root_test.go
@@ -605,6 +605,31 @@ func TestBuildParams_StringParsing(t *testing.T) {
 	}
 }
 
+func TestBuildParams_UsingsParsing(t *testing.T) {
+	p, err := buildParams([]string{
+		"--usings", "UnityEditor.Build.Profile, Accelix.Editor.Tools.BuildManager",
+		"--usings", "Unity.Entities",
+		"--usings", "Unity.Entities",
+	}, nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	got, ok := p["usings"].([]string)
+	if !ok {
+		t.Fatalf("expected usings []string, got %T: %v", p["usings"], p["usings"])
+	}
+
+	want := []string{
+		"UnityEditor.Build.Profile",
+		"Accelix.Editor.Tools.BuildManager",
+		"Unity.Entities",
+	}
+	if !sliceEqual(got, want) {
+		t.Errorf("expected usings=%v, got %v", want, got)
+	}
+}
+
 func TestBuildParams_BaseParams(t *testing.T) {
 	p, err := buildParams([]string{"--depth", "5"}, map[string]interface{}{"action": "hierarchy"})
 	if err != nil {
diff --git a/internal/client/client.go b/internal/client/client.go
index d279763..ee5280d 100644
--- a/internal/client/client.go
+++ b/internal/client/client.go
@@ -178,7 +178,13 @@ func DiscoverInstance(project string) (*Instance, error) {
 }
 
 func normalizeProjectPath(path string) string {
-	normalized := strings.TrimRight(filepath.ToSlash(path), "/")
+	normalized := filepath.Clean(path)
+	if filepath.IsAbs(normalized) {
+		if resolved, err := filepath.EvalSymlinks(normalized); err == nil {
+			normalized = resolved
+		}
+	}
+	normalized = strings.TrimRight(filepath.ToSlash(normalized), "/")
 	if runtime.GOOS == "windows" {
 		normalized = strings.ToLower(normalized)
 	}
diff --git a/unity-connector/Editor/Tools/ExecuteCsharp.cs b/unity-connector/Editor/Tools/ExecuteCsharp.cs
index 513736d..665f891 100644
--- a/unity-connector/Editor/Tools/ExecuteCsharp.cs
+++ b/unity-connector/Editor/Tools/ExecuteCsharp.cs
@@ -35,7 +35,7 @@ public class Parameters
             [ToolParameter("C# code to execute. Use 'return' for output.", Required = true)]
             public string Code { get; set; }
 
-            [ToolParameter("Additional using directives (comma-separated, e.g. Unity.Entities,Unity.Mathematics)")]
+            [ToolParameter("Additional using directives (comma-separated or repeated CLI --usings, e.g. Unity.Entities,Unity.Mathematics)")]
             public string[] Usings { get; set; }
 
             [ToolParameter("Path to csc compiler (csc.dll or csc.exe). Auto-detected if omitted.")]