diff --git a/dd-java-agent/agent-aiguard/src/main/java/com/datadog/aiguard/AIGuardInternal.java b/dd-java-agent/agent-aiguard/src/main/java/com/datadog/aiguard/AIGuardInternal.java
index 4ea7967a948..2057c1a4532 100644
--- a/dd-java-agent/agent-aiguard/src/main/java/com/datadog/aiguard/AIGuardInternal.java
+++ b/dd-java-agent/agent-aiguard/src/main/java/com/datadog/aiguard/AIGuardInternal.java
@@ -69,6 +69,7 @@ public BadConfigurationException(final String message) {
   static final String ACTION_TAG = "ai_guard.action";
   static final String REASON_TAG = "ai_guard.reason";
   static final String BLOCKED_TAG = "ai_guard.blocked";
+  static final String EVENT_TAG = "ai_guard.event";
   static final String META_STRUCT_TAG = "ai_guard";
   static final String META_STRUCT_MESSAGES = "messages";
   static final String META_STRUCT_CATEGORIES = "attack_categories";
@@ -227,6 +228,7 @@ public Evaluation evaluate(final List<Message> messages, final Options options)
     final AgentSpan localRootSpan = span.getLocalRootSpan();
     if (localRootSpan != null) {
       localRootSpan.setTag(Tags.AI_GUARD_KEEP, true);
+      localRootSpan.setTag(EVENT_TAG, true);
     }
     try (final AgentScope scope = tracer.activateSpan(span)) {
       final Message last = messages.get(messages.size() - 1);
diff --git a/dd-java-agent/agent-aiguard/src/test/groovy/com/datadog/aiguard/AIGuardInternalTests.groovy b/dd-java-agent/agent-aiguard/src/test/groovy/com/datadog/aiguard/AIGuardInternalTests.groovy
index dc5b7769e70..24ad23530c2 100644
--- a/dd-java-agent/agent-aiguard/src/test/groovy/com/datadog/aiguard/AIGuardInternalTests.groovy
+++ b/dd-java-agent/agent-aiguard/src/test/groovy/com/datadog/aiguard/AIGuardInternalTests.groovy
@@ -190,6 +190,7 @@ class AIGuardInternalTests extends DDSpecification {
     then:
     1 * span.setTag(AIGuardInternal.TARGET_TAG, suite.target)
     1 * localRootSpan.setTag(Tags.AI_GUARD_KEEP, true)
+    1 * localRootSpan.setTag(AIGuardInternal.EVENT_TAG, true)
     if (suite.target == 'tool') {
       1 * span.setTag(AIGuardInternal.TOOL_TAG, 'calc')
     }