diff --git a/cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/DetailService.java b/cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/DetailService.java
index b3defe23..ed95514c 100644
--- a/cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/DetailService.java
+++ b/cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/DetailService.java
@@ -97,6 +97,7 @@ public class DetailService {
                     p.getRootCauseType(), p.getRootCauseMessage(),
                     p.getErrorHandlerType(), p.getCircuitBreakerState(),
                     p.getFallbackTriggered(),
+                    p.getFilterMatched(), p.getDuplicateMessage(),
                     hasTrace
             );
             for (ProcessorNode child : convertProcessors(p.getChildren())) {
@@ -132,6 +133,7 @@ public class DetailService {
                     p.rootCauseType(), p.rootCauseMessage(),
                     p.errorHandlerType(), p.circuitBreakerState(),
                     p.fallbackTriggered(),
+                    null, null, // filterMatched, duplicateMessage (not in flat DB records)
                     hasTrace
             ));
         }
diff --git a/cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/ProcessorNode.java b/cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/ProcessorNode.java
index 850c7cf7..8c7d41da 100644
--- a/cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/ProcessorNode.java
+++ b/cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/ProcessorNode.java
@@ -35,6 +35,8 @@ public final class ProcessorNode {
     private final String errorHandlerType;
     private final String circuitBreakerState;
     private final Boolean fallbackTriggered;
+    private final Boolean filterMatched;
+    private final Boolean duplicateMessage;
     private final boolean hasTraceData;
     private final List<ProcessorNode> children;
 
@@ -50,6 +52,7 @@ public final class ProcessorNode {
                          String rootCauseType, String rootCauseMessage,
                          String errorHandlerType, String circuitBreakerState,
                          Boolean fallbackTriggered,
+                         Boolean filterMatched, Boolean duplicateMessage,
                          boolean hasTraceData) {
         this.processorId = processorId;
         this.processorType = processorType;
@@ -73,6 +76,8 @@ public final class ProcessorNode {
         this.errorHandlerType = errorHandlerType;
         this.circuitBreakerState = circuitBreakerState;
         this.fallbackTriggered = fallbackTriggered;
+        this.filterMatched = filterMatched;
+        this.duplicateMessage = duplicateMessage;
         this.hasTraceData = hasTraceData;
         this.children = new ArrayList<>();
     }
@@ -103,6 +108,8 @@ public final class ProcessorNode {
     public String getErrorHandlerType() { return errorHandlerType; }
     public String getCircuitBreakerState() { return circuitBreakerState; }
     public Boolean getFallbackTriggered() { return fallbackTriggered; }
+    public Boolean getFilterMatched() { return filterMatched; }
+    public Boolean getDuplicateMessage() { return duplicateMessage; }
     public boolean isHasTraceData() { return hasTraceData; }
     public List<ProcessorNode> getChildren() { return List.copyOf(children); }
 }
diff --git a/ui/src/components/ExecutionDiagram/types.ts b/ui/src/components/ExecutionDiagram/types.ts
index 47db9b42..9404b88a 100644
--- a/ui/src/components/ExecutionDiagram/types.ts
+++ b/ui/src/components/ExecutionDiagram/types.ts
@@ -12,6 +12,10 @@ export interface NodeExecutionState {
   hasTraceData?: boolean;
   /** Runtime-resolved endpoint URI (for TO_DYNAMIC, etc.) */
   resolvedEndpointUri?: string;
+  /** Filter processor: true if predicate matched, false if message was rejected */
+  filterMatched?: boolean;
+  /** Idempotent consumer: true if duplicate message detected and children skipped */
+  duplicateMessage?: boolean;
 }
 
 export interface IterationInfo {
diff --git a/ui/src/components/ExecutionDiagram/useExecutionOverlay.ts b/ui/src/components/ExecutionDiagram/useExecutionOverlay.ts
index 5fa029d8..a734499a 100644
--- a/ui/src/components/ExecutionDiagram/useExecutionOverlay.ts
+++ b/ui/src/components/ExecutionDiagram/useExecutionOverlay.ts
@@ -61,6 +61,8 @@ function buildOverlay(
       subRouteFailed: subRouteFailed || undefined,
       hasTraceData: !!proc.hasTraceData,
       resolvedEndpointUri: proc.resolvedEndpointUri || undefined,
+      filterMatched: (proc as Record<string, unknown>).filterMatched as boolean | undefined,
+      duplicateMessage: (proc as Record<string, unknown>).duplicateMessage as boolean | undefined,
     });
 
     // Recurse into children
diff --git a/ui/src/components/ProcessDiagram/CompoundNode.tsx b/ui/src/components/ProcessDiagram/CompoundNode.tsx
index e6980d27..a34505d9 100644
--- a/ui/src/components/ProcessDiagram/CompoundNode.tsx
+++ b/ui/src/components/ProcessDiagram/CompoundNode.tsx
@@ -66,6 +66,12 @@ export function CompoundNode({
     onNodeClick, onNodeDoubleClick, onNodeEnter, onNodeLeave,
   };
 
+  // Gate state: filter rejected or idempotent duplicate → amber container
+  const ownState = node.id ? executionOverlay?.get(node.id) : undefined;
+  const isGated = ownState?.filterMatched === false || ownState?.duplicateMessage === true;
+  const GATE_COLOR = '#D97706'; // amber-600
+  const effectiveColor = isGated ? GATE_COLOR : color;
+
   // _TRY_BODY / _CB_MAIN: transparent wrapper — no header, no border, just layout
   if (node.type === '_TRY_BODY' || node.type === '_CB_MAIN') {
     return (
@@ -118,7 +124,8 @@ export function CompoundNode({
     );
   }
 
-  // Default compound rendering (DO_TRY, EIP_CHOICE, etc.)
+  // Default compound rendering (DO_TRY, EIP_CHOICE, EIP_FILTER, EIP_IDEMPOTENT_CONSUMER, etc.)
+  const containerFill = isGated ? '#FFFBEB' : 'white'; // amber-50 tint when gated
   return (
     <g data-node-id={node.id} transform={`translate(${x}, ${y})`}>
       {/* Container body */}
@@ -128,14 +135,14 @@ export function CompoundNode({
         width={w}
         height={h}
         rx={CORNER_RADIUS}
-        fill="white"
-        stroke={color}
-        strokeWidth={1.5}
+        fill={containerFill}
+        stroke={effectiveColor}
+        strokeWidth={isGated ? 2 : 1.5}
       />
 
       {/* Colored header bar */}
-      <rect x={0} y={0} width={w} height={HEADER_HEIGHT} rx={CORNER_RADIUS} fill={color} />
-      <rect x={CORNER_RADIUS} y={CORNER_RADIUS} width={w - CORNER_RADIUS * 2} height={HEADER_HEIGHT - CORNER_RADIUS} fill={color} />
+      <rect x={0} y={0} width={w} height={HEADER_HEIGHT} rx={CORNER_RADIUS} fill={effectiveColor} />
+      <rect x={CORNER_RADIUS} y={CORNER_RADIUS} width={w - CORNER_RADIUS * 2} height={HEADER_HEIGHT - CORNER_RADIUS} fill={effectiveColor} />
 
       {/* Header icon (left-aligned) */}
       <g transform={`translate(6, ${HEADER_HEIGHT / 2 - 5}) scale(0.417)`}>