✨ Fix webhook error handling with reliable error display

- API now properly detects N8N errors in 200 responses (OpenAI quota, etc.)
- Returns 400 status with simple "Agent unavailable" message for webhook failures
- Frontend shows errors in results container instead of disappearing toast notifications
- Users now see clear, persistent error messages when agents fail
- Keeps success toasts working, only fixes error display

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

agents/api_views.py

@@ -102,18 +102,35 @@ def execute_agent(request):
         # Store webhook response
         execution.webhook_response = response.json() if response.headers.get('content-type', '').startswith('application/json') else {'raw': response.text}
         
-        if response.status_code == 200:
+        # Check if response contains N8N error indicators
+        has_error = False
+        if response.status_code == 200 and execution.webhook_response:
+            # Check for N8N error patterns
+            if isinstance(execution.webhook_response, dict):
+                if 'errorMessage' in execution.webhook_response or 'error' in execution.webhook_response:
+                    has_error = True
+        
+        if response.status_code == 200 and not has_error:
             execution.status = 'completed'
             execution.output_data = execution.webhook_response
-        else:
-            execution.status = 'failed'
-            execution.error_message = f"Webhook returned {response.status_code}: {response.text[:500]}"
-        
             execution.completed_at = timezone.now()
             execution.save()
             
             serializer = AgentExecutionSerializer(execution)
             return Response(serializer.data, status=status.HTTP_201_CREATED)
+        else:
+            execution.status = 'failed'
+            if has_error:
+                error_msg = execution.webhook_response.get('errorMessage', 'Webhook execution failed')
+                execution.error_message = f"N8N Error: {error_msg[:500]}"
+            else:
+                execution.error_message = f"Webhook returned {response.status_code}: {response.text[:500]}"
+            execution.completed_at = timezone.now()
+            execution.save()
+            
+            return Response({
+                'error': 'Agent is temporarily unavailable. Please try again later.'
+            }, status=status.HTTP_400_BAD_REQUEST)
         
     except requests.RequestException as e:
         execution.status = 'failed'

static/js/agents-core.js

@@ -57,7 +57,7 @@ class AgentsCore extends WorkflowsCore {
         } catch (error) {
             console.error('Form submission error:', error);
             this.constructor.hideProcessing();
-            this.constructor.showToast('❌ Connection error. Please try again.', 'error');
+            this.showErrorMessage('❌ Agent is temporarily unavailable. Please try again later.');
             this.resetSubmitButton();
         }
     }
@@ -84,7 +84,7 @@ class AgentsCore extends WorkflowsCore {
         } catch (error) {
             console.error('Agent execution error:', error);
             this.constructor.hideProcessing();
-            this.constructor.showToast(`❌ ${error.message}`, 'error');
+            this.showErrorMessage('❌ Agent is temporarily unavailable. Please try again later.');
             this.resetSubmitButton();
         }
     }
@@ -545,6 +545,36 @@ class AgentsCore extends WorkflowsCore {
         }
     }
     
+    /**
+     * Show error message in results container
+     */
+    showErrorMessage(message) {
+        const resultsContainer = document.getElementById('resultsContainer');
+        const resultsContent = document.getElementById('resultsContent');
+        
+        if (resultsContainer && resultsContent) {
+            resultsContent.innerHTML = `
+                <div style="
+                    background: #fee2e2;
+                    border: 1px solid #fecaca;
+                    border-radius: 8px;
+                    padding: 20px;
+                    text-align: center;
+                    color: #dc2626;
+                    font-size: 16px;
+                    font-weight: 500;
+                    margin: 20px 0;
+                ">
+                    ${message}
+                </div>
+            `;
+            
+            // Show results container
+            resultsContainer.style.display = 'block';
+            resultsContainer.scrollIntoView({ behavior: 'smooth', block: 'start' });
+        }
+    }
+    
     /**
      * Reset submit button to original state
      */

static/js/workflows-core.js

@@ -32,8 +32,9 @@ class WorkflowsCore {
                 position: fixed;
                 top: 20px;
                 right: 20px;
-                z-index: 10000;
+                z-index: 99999;
                 max-width: 400px;
+                pointer-events: none;
             `;
             
             // Safely append to body
@@ -61,6 +62,9 @@ class WorkflowsCore {
             display: flex;
             align-items: center;
             animation: slideIn 0.3s ease-out;
+            pointer-events: auto;
+            position: relative;
+            z-index: 100000;
         `;
         
         // Add icon and message
@@ -94,12 +98,13 @@ class WorkflowsCore {
         
         toastContainer.appendChild(toast);
         
-        // Auto-remove after 5 seconds
+        // Auto-remove after longer time for errors
+        const timeout = type === 'error' ? 8000 : 5000; // 8 seconds for errors, 5 for others
         setTimeout(() => {
             if (toast.parentElement) {
                 toast.remove();
             }
-        }, 5000);
+        }, timeout);
     }
     
     /**