diff --git a/packages/core/src/subagents/validation.test.ts b/packages/core/src/subagents/validation.test.ts
index 27db9595f..420483b11 100644
--- a/packages/core/src/subagents/validation.test.ts
+++ b/packages/core/src/subagents/validation.test.ts
@@ -22,6 +22,11 @@ describe('SubagentValidator', () => {
         'code_reviewer',
         'agent123',
         'my-helper',
+        '项目管理',
+        'コードレビュー',
+        '코드리뷰',
+        '项目-manager',
+        'проект_менеджер',
       ];
 
       for (const name of validNames) {
@@ -120,6 +125,14 @@ describe('SubagentValidator', () => {
       );
     });
 
+    it('should not warn about case for non-Latin names', () => {
+      const result = validator.validateName('项目管理');
+      expect(result.isValid).toBe(true);
+      expect(result.warnings).not.toContain(
+        'Consider using lowercase names for consistency',
+      );
+    });
+
     it('should warn about mixed separators', () => {
       const result = validator.validateName('test-agent_helper');
       expect(result.isValid).toBe(true);
diff --git a/packages/core/src/subagents/validation.ts b/packages/core/src/subagents/validation.ts
index abab2c72a..a885b14c4 100644
--- a/packages/core/src/subagents/validation.ts
+++ b/packages/core/src/subagents/validation.ts
@@ -116,8 +116,8 @@ export class SubagentValidator {
       errors.push('Name must be 50 characters or less');
     }
 
-    // Check valid characters (alphanumeric, hyphens, underscores)
-    const validNameRegex = /^[a-zA-Z0-9_-]+$/;
+    // Check valid characters (Unicode letters/numbers, hyphens, underscores)
+    const validNameRegex = /^[\p{L}\p{N}_-]+$/u;
     if (!validNameRegex.test(trimmedName)) {
       errors.push(
         'Name can only contain letters, numbers, hyphens, and underscores',
@@ -147,8 +147,11 @@ export class SubagentValidator {
       errors.push(`"${trimmedName}" is a reserved name and cannot be used`);
     }
 
-    // Warnings for naming conventions
-    if (trimmedName !== trimmedName.toLowerCase()) {
+    // Warnings for naming conventions (only for names that have case distinctions)
+    if (
+      trimmedName !== trimmedName.toLowerCase() &&
+      /[a-zA-Z]/.test(trimmedName)
+    ) {
       warnings.push('Consider using lowercase names for consistency');
     }