diff --git a/dd-java-agent/instrumentation-testing/src/main/groovy/datadog/trace/agent/test/TrackingSpanDecorator.groovy b/dd-java-agent/instrumentation-testing/src/main/groovy/datadog/trace/agent/test/TrackingSpanDecorator.groovy
index b9de4adad0e..53d5ad5d9de 100644
--- a/dd-java-agent/instrumentation-testing/src/main/groovy/datadog/trace/agent/test/TrackingSpanDecorator.groovy
+++ b/dd-java-agent/instrumentation-testing/src/main/groovy/datadog/trace/agent/test/TrackingSpanDecorator.groovy
@@ -414,4 +414,9 @@ class TrackingSpanDecorator implements AgentSpan {
   boolean isOutbound() {
     return delegate.isOutbound()
   }
+
+  @Override
+  boolean isFinished() {
+    return delegate.isFinished()
+  }
 }
diff --git a/dd-trace-core/src/test/java/datadog/trace/core/DDSpanTest.java b/dd-trace-core/src/test/java/datadog/trace/core/DDSpanTest.java
index a05e9d982c4..b3103f7f161 100644
--- a/dd-trace-core/src/test/java/datadog/trace/core/DDSpanTest.java
+++ b/dd-trace-core/src/test/java/datadog/trace/core/DDSpanTest.java
@@ -26,6 +26,7 @@
 import datadog.trace.api.datastreams.NoopPathwayContext;
 import datadog.trace.api.gateway.RequestContextSlot;
 import datadog.trace.api.sampling.PrioritySampling;
+import datadog.trace.bootstrap.instrumentation.api.AgentSpan;
 import datadog.trace.bootstrap.instrumentation.api.AgentSpanContext;
 import datadog.trace.bootstrap.instrumentation.api.ErrorPriorities;
 import datadog.trace.bootstrap.instrumentation.api.TagContext;
@@ -61,6 +62,15 @@ void setup() {
     tracer = tracerBuilder().writer(writer).sampler(new RateByServiceTraceSampler()).build();
   }
 
+  @Test
+  void isFinishedReflectsSpanCompletion() {
+    // Exercised via the AgentSpan interface to prove the new default resolves to DDSpan's override.
+    AgentSpan span = tracer.buildSpan("datadog", "finishTest").start();
+    assertFalse(span.isFinished(), "span must not report finished before finish()");
+    span.finish();
+    assertTrue(span.isFinished(), "span must report finished after finish()");
+  }
+
   @Test
   void gettersAndSetters() {
     DDSpan span =
diff --git a/internal-api/src/main/java/datadog/trace/bootstrap/instrumentation/api/AgentSpan.java b/internal-api/src/main/java/datadog/trace/bootstrap/instrumentation/api/AgentSpan.java
index c42d98b5f3d..3fed5c481d0 100644
--- a/internal-api/src/main/java/datadog/trace/bootstrap/instrumentation/api/AgentSpan.java
+++ b/internal-api/src/main/java/datadog/trace/bootstrap/instrumentation/api/AgentSpan.java
@@ -222,6 +222,14 @@ default AgentSpan asAgentSpan() {
     return this;
   }
 
+  /**
+   * @return {@code true} once this span has finished (its duration is set). Implementations that do
+   *     not track finish state always return {@code false}.
+   */
+  default boolean isFinished() {
+    return false;
+  }
+
   default void copyPropagationAndBaggage(final AgentSpan source) {
     // no op default
   }