diff --git a/frontend/src/components/workflow/panels/ValidationPanel.jsx b/frontend/src/components/workflow/panels/ValidationPanel.jsx
new file mode 100644
index 0000000..804a3e4
--- /dev/null
+++ b/frontend/src/components/workflow/panels/ValidationPanel.jsx
@@ -0,0 +1,246 @@
+import { useState } from 'react'
+import { AlertCircle, AlertTriangle, ChevronDown, ChevronRight, X } from 'lucide-react'
+
+/**
+ * ValidationPanel - Zeigt Fehler und Warnungen mit Details
+ *
+ * Features:
+ * - Aufklappbar (collapsible)
+ * - Click-to-Jump zu betroffener Node
+ * - Gruppierung nach Severity
+ * - Klare visuelle Trennung
+ */
+export function ValidationPanel({ errors, warnings, onNodeClick, onClose }) {
+  const [isExpanded, setIsExpanded] = useState(true)
+  const [showErrors, setShowErrors] = useState(true)
+  const [showWarnings, setShowWarnings] = useState(true)
+
+  const totalCount = errors.length + warnings.length
+
+  if (totalCount === 0) return null
+
+  const handleItemClick = (item) => {
+    if (item.nodeId && onNodeClick) {
+      onNodeClick(item.nodeId)
+    }
+  }
+
+  return (
+    <div style={{
+      position: 'fixed',
+      bottom: 90,
+      right: 20,
+      width: 400,
+      maxHeight: '60vh',
+      background: 'var(--surface)',
+      border: '1px solid var(--border)',
+      borderRadius: 8,
+      boxShadow: '0 4px 12px rgba(0,0,0,0.15)',
+      display: 'flex',
+      flexDirection: 'column',
+      zIndex: 100
+    }}>
+      {/* Header */}
+      <div
+        onClick={() => setIsExpanded(!isExpanded)}
+        style={{
+          padding: '12px 16px',
+          borderBottom: isExpanded ? '1px solid var(--border)' : 'none',
+          display: 'flex',
+          alignItems: 'center',
+          justifyContent: 'space-between',
+          cursor: 'pointer',
+          userSelect: 'none',
+          background: errors.length > 0 ? 'rgba(216, 90, 48, 0.1)' : 'rgba(255, 193, 7, 0.1)'
+        }}
+      >
+        <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
+          {isExpanded ? <ChevronDown size={18} /> : <ChevronRight size={18} />}
+          <AlertCircle size={18} color={errors.length > 0 ? 'var(--danger)' : '#f59e0b'} />
+          <span style={{ fontWeight: 600, fontSize: 14 }}>
+            Validierung
+          </span>
+          <span style={{ fontSize: 12, color: 'var(--text3)' }}>
+            {errors.length > 0 && `${errors.length} Fehler`}
+            {errors.length > 0 && warnings.length > 0 && ', '}
+            {warnings.length > 0 && `${warnings.length} Warnung${warnings.length > 1 ? 'en' : ''}`}
+          </span>
+        </div>
+        <button
+          onClick={(e) => {
+            e.stopPropagation()
+            onClose && onClose()
+          }}
+          style={{
+            background: 'none',
+            border: 'none',
+            cursor: 'pointer',
+            padding: 4,
+            display: 'flex',
+            alignItems: 'center'
+          }}
+        >
+          <X size={16} color="var(--text3)" />
+        </button>
+      </div>
+
+      {/* Content */}
+      {isExpanded && (
+        <div style={{
+          overflowY: 'auto',
+          maxHeight: 'calc(60vh - 60px)'
+        }}>
+          {/* Errors */}
+          {errors.length > 0 && (
+            <div>
+              <div
+                onClick={() => setShowErrors(!showErrors)}
+                style={{
+                  padding: '8px 16px',
+                  background: 'rgba(216, 90, 48, 0.05)',
+                  display: 'flex',
+                  alignItems: 'center',
+                  gap: 8,
+                  cursor: 'pointer',
+                  userSelect: 'none',
+                  borderBottom: '1px solid var(--border)'
+                }}
+              >
+                {showErrors ? <ChevronDown size={16} /> : <ChevronRight size={16} />}
+                <AlertCircle size={16} color="var(--danger)" />
+                <span style={{ fontWeight: 600, fontSize: 13, color: 'var(--danger)' }}>
+                  Fehler ({errors.length})
+                </span>
+              </div>
+              {showErrors && (
+                <div>
+                  {errors.map((error, idx) => (
+                    <div
+                      key={idx}
+                      onClick={() => handleItemClick(error)}
+                      style={{
+                        padding: '10px 16px',
+                        borderBottom: idx < errors.length - 1 ? '1px solid var(--border)' : 'none',
+                        cursor: error.nodeId ? 'pointer' : 'default',
+                        background: error.nodeId ? 'transparent' : 'transparent',
+                        transition: 'background 0.15s',
+                      }}
+                      onMouseEnter={(e) => {
+                        if (error.nodeId) e.currentTarget.style.background = 'rgba(216, 90, 48, 0.05)'
+                      }}
+                      onMouseLeave={(e) => {
+                        e.currentTarget.style.background = 'transparent'
+                      }}
+                    >
+                      <div style={{
+                        fontSize: 13,
+                        color: 'var(--text1)',
+                        marginBottom: 4
+                      }}>
+                        {error.message}
+                      </div>
+                      {error.nodeId && (
+                        <div style={{
+                          fontSize: 11,
+                          color: 'var(--text3)',
+                          fontFamily: 'monospace'
+                        }}>
+                          → Klicken um zu Node zu springen
+                        </div>
+                      )}
+                      {error.type && (
+                        <div style={{
+                          fontSize: 10,
+                          color: 'var(--text3)',
+                          marginTop: 4,
+                          textTransform: 'uppercase'
+                        }}>
+                          {error.type}
+                        </div>
+                      )}
+                    </div>
+                  ))}
+                </div>
+              )}
+            </div>
+          )}
+
+          {/* Warnings */}
+          {warnings.length > 0 && (
+            <div>
+              <div
+                onClick={() => setShowWarnings(!showWarnings)}
+                style={{
+                  padding: '8px 16px',
+                  background: 'rgba(255, 193, 7, 0.05)',
+                  display: 'flex',
+                  alignItems: 'center',
+                  gap: 8,
+                  cursor: 'pointer',
+                  userSelect: 'none',
+                  borderBottom: '1px solid var(--border)'
+                }}
+              >
+                {showWarnings ? <ChevronDown size={16} /> : <ChevronRight size={16} />}
+                <AlertTriangle size={16} color="#f59e0b" />
+                <span style={{ fontWeight: 600, fontSize: 13, color: '#f59e0b' }}>
+                  Warnungen ({warnings.length})
+                </span>
+              </div>
+              {showWarnings && (
+                <div>
+                  {warnings.map((warning, idx) => (
+                    <div
+                      key={idx}
+                      onClick={() => handleItemClick(warning)}
+                      style={{
+                        padding: '10px 16px',
+                        borderBottom: idx < warnings.length - 1 ? '1px solid var(--border)' : 'none',
+                        cursor: warning.nodeId ? 'pointer' : 'default',
+                        background: 'transparent',
+                        transition: 'background 0.15s',
+                      }}
+                      onMouseEnter={(e) => {
+                        if (warning.nodeId) e.currentTarget.style.background = 'rgba(255, 193, 7, 0.05)'
+                      }}
+                      onMouseLeave={(e) => {
+                        e.currentTarget.style.background = 'transparent'
+                      }}
+                    >
+                      <div style={{
+                        fontSize: 13,
+                        color: 'var(--text1)',
+                        marginBottom: 4
+                      }}>
+                        {warning.message}
+                      </div>
+                      {warning.nodeId && (
+                        <div style={{
+                          fontSize: 11,
+                          color: 'var(--text3)',
+                          fontFamily: 'monospace'
+                        }}>
+                          → Klicken um zu Node zu springen
+                        </div>
+                      )}
+                      {warning.type && (
+                        <div style={{
+                          fontSize: 10,
+                          color: 'var(--text3)',
+                          marginTop: 4,
+                          textTransform: 'uppercase'
+                        }}>
+                          {warning.type}
+                        </div>
+                      )}
+                    </div>
+                  ))}
+                </div>
+              )}
+            </div>
+          )}
+        </div>
+      )}
+    </div>
+  )
+}
diff --git a/frontend/src/pages/WorkflowEditorPage.jsx b/frontend/src/pages/WorkflowEditorPage.jsx
index fb1f4a5..35392d8 100644
--- a/frontend/src/pages/WorkflowEditorPage.jsx
+++ b/frontend/src/pages/WorkflowEditorPage.jsx
@@ -19,6 +19,7 @@ import { PlaceholderPicker } from '../components/workflow/panels/PlaceholderPick
 import { WorkflowExecutePanel } from '../components/workflow/panels/WorkflowExecutePanel'
 import { WorkflowResultViewer } from '../components/workflow/panels/WorkflowResultViewer'
 import { InlineTemplateEditor } from '../components/workflow/panels/InlineTemplateEditor'
+import { ValidationPanel } from '../components/workflow/panels/ValidationPanel'
 import { Toast } from '../components/Toast'
 import { ConfirmDialog } from '../components/ConfirmDialog'
 import '../styles/workflowEditor.css'
@@ -78,6 +79,7 @@ export default function WorkflowEditorPage() {
   const endNodeTextareaRef = useRef(null)
   const inlineTemplateTextareaRef = useRef(null)
   const [hasUnsavedChanges, setHasUnsavedChanges] = useState(false)
+  const [showValidationPanel, setShowValidationPanel] = useState(true)
 
   // Toast & Confirm Dialog
   const [toast, setToast] = useState(null)
@@ -122,6 +124,11 @@ export default function WorkflowEditorPage() {
     const { errors, warnings } = validateWorkflowGraph(nodes, edges)
     setValidationErrors(errors)
     setValidationWarnings(warnings)
+
+    // Re-show validation panel if there are new errors/warnings
+    if (errors.length > 0 || warnings.length > 0) {
+      setShowValidationPanel(true)
+    }
   }, [nodes, edges])
 
   // Warn on browser back/refresh if unsaved changes
@@ -380,6 +387,15 @@ export default function WorkflowEditorPage() {
     navigate('/admin/prompts')
   }
 
+  const handleValidationNodeClick = (nodeId) => {
+    // Select the node to show its config panel
+    setSelectedNodeId(nodeId)
+
+    // TODO: Optional - scroll to node in canvas
+    // ReactFlow doesn't expose a direct scrollTo API, but we could use fitView
+    // or manual DOM manipulation if needed
+  }
+
   const handlePlaceholderSelect = (placeholderString) => {
     if (!selectedNode) return
 
@@ -870,6 +886,16 @@ export default function WorkflowEditorPage() {
         />
       )}
 
+      {/* Validation Panel */}
+      {showValidationPanel && (validationErrors.length > 0 || validationWarnings.length > 0) && (
+        <ValidationPanel
+          errors={validationErrors}
+          warnings={validationWarnings}
+          onNodeClick={handleValidationNodeClick}
+          onClose={() => setShowValidationPanel(false)}
+        />
+      )}
+
       {/* Toast Notification */}
       {toast && (
         <Toast