diff --git a/CLAUDE.md b/CLAUDE.md
index 798ae59..c8fdaac 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -68,4 +68,6 @@ src/
 
 ### Development Workflow Reminders
 - When you make changes to MCP server, you need to ask the user to reload it before you test
-- When the user asks to review issues, you should use GH CLI to get the issue and all the comments
\ No newline at end of file
+- When the user asks to review issues, you should use GH CLI to get the issue and all the comments
+- When the task can be divided into separated subtasks, you should spawn separate sub-agents to handle them in paralel
+- Use the best sub-agent for the task as per their descriptions
\ No newline at end of file
diff --git a/tests/unit/mcp/handlers-n8n-manager.test.ts b/tests/unit/mcp/handlers-n8n-manager.test.ts
index 8f54bb1..e5c0703 100644
--- a/tests/unit/mcp/handlers-n8n-manager.test.ts
+++ b/tests/unit/mcp/handlers-n8n-manager.test.ts
@@ -453,7 +453,7 @@ describe('handlers-n8n-manager', () => {
   describe('handleValidateWorkflow', () => {
     it('should validate workflow from n8n instance', async () => {
       const testWorkflow = createTestWorkflow();
-      const mockNodeRepository = new NodeRepository(':memory:');
+      const mockNodeRepository = {} as any; // Mock repository
 
       mockApiClient.getWorkflow.mockResolvedValue(testWorkflow);
       mockValidator.validateWorkflow.mockResolvedValue({
@@ -614,7 +614,7 @@ describe('handlers-n8n-manager', () => {
     });
 
     it('should handle rate limit errors', async () => {
-      const rateLimitError = new N8nRateLimitError('Too many requests', 60);
+      const rateLimitError = new N8nRateLimitError(60);
       mockApiClient.listWorkflows.mockRejectedValue(rateLimitError);
 
       const result = await handlers.handleListWorkflows({});
diff --git a/tests/unit/mcp/handlers-workflow-diff.test.ts b/tests/unit/mcp/handlers-workflow-diff.test.ts
index b894d02..013a5f9 100644
--- a/tests/unit/mcp/handlers-workflow-diff.test.ts
+++ b/tests/unit/mcp/handlers-workflow-diff.test.ts
@@ -351,7 +351,7 @@ describe('handlers-workflow-diff', () => {
       expect(result.success).toBe(false);
       expect(result.error).toBe('Invalid input');
       expect(result.details).toHaveProperty('errors');
-      expect(result.details.errors).toBeInstanceOf(Array);
+      expect(result.details?.errors).toBeInstanceOf(Array);
     });
 
     it('should handle complex operation types', async () => {
@@ -462,7 +462,7 @@ describe('handlers-workflow-diff', () => {
     });
 
     it('should handle rate limit errors', async () => {
-      const rateLimitError = new N8nRateLimitError('Too many requests', 60);
+      const rateLimitError = new N8nRateLimitError(60);
       mockApiClient.getWorkflow.mockRejectedValue(rateLimitError);
 
       const result = await handleUpdatePartialWorkflow({