diff --git a/data/nodes.db b/data/nodes.db
index 736d392..fe92ce1 100644
Binary files a/data/nodes.db and b/data/nodes.db differ
diff --git a/src/services/n8n-validation.ts b/src/services/n8n-validation.ts
index f52beb3..1163419 100644
--- a/src/services/n8n-validation.ts
+++ b/src/services/n8n-validation.ts
@@ -140,6 +140,7 @@ export function cleanWorkflowForUpdate(workflow: Workflow): Partial<Workflow> {
     // Remove fields that cause API errors
     pinData,
     tags,
+    description, // Issue #431: n8n returns this field but rejects it in updates
     // Remove additional fields that n8n API doesn't accept
     isArchived,
     usedCredentials,
diff --git a/src/types/n8n-api.ts b/src/types/n8n-api.ts
index 6b9d30b..be54d28 100644
--- a/src/types/n8n-api.ts
+++ b/src/types/n8n-api.ts
@@ -56,6 +56,7 @@ export interface WorkflowSettings {
 export interface Workflow {
   id?: string;
   name: string;
+  description?: string; // Returned by GET but must be excluded from PUT/PATCH (n8n API limitation, Issue #431)
   nodes: WorkflowNode[];
   connections: WorkflowConnection;
   active?: boolean; // Optional for creation as it's read-only
diff --git a/tests/unit/services/n8n-validation.test.ts b/tests/unit/services/n8n-validation.test.ts
index b0e5cdc..3e7c7f9 100644
--- a/tests/unit/services/n8n-validation.test.ts
+++ b/tests/unit/services/n8n-validation.test.ts
@@ -367,6 +367,22 @@ describe('n8n-validation', () => {
         expect(cleaned.name).toBe('Test Workflow');
       });
 
+      it('should exclude description field for n8n API compatibility (Issue #431)', () => {
+        const workflow = {
+          name: 'Test Workflow',
+          description: 'This is a test workflow description',
+          nodes: [],
+          connections: {},
+          versionId: 'v123',
+        } as any;
+
+        const cleaned = cleanWorkflowForUpdate(workflow);
+
+        expect(cleaned).not.toHaveProperty('description');
+        expect(cleaned).not.toHaveProperty('versionId');
+        expect(cleaned.name).toBe('Test Workflow');
+      });
+
       it('should omit settings property when no settings provided (Issue #431)', () => {
         const workflow = {
           name: 'Test Workflow',