diff --git a/models/spring-ai-anthropic/src/main/java/org/springframework/ai/anthropic/api/StreamHelper.java b/models/spring-ai-anthropic/src/main/java/org/springframework/ai/anthropic/api/StreamHelper.java
index ae62eb0748c..cb469a50e47 100644
--- a/models/spring-ai-anthropic/src/main/java/org/springframework/ai/anthropic/api/StreamHelper.java
+++ b/models/spring-ai-anthropic/src/main/java/org/springframework/ai/anthropic/api/StreamHelper.java
@@ -54,18 +54,19 @@
 public class StreamHelper {
 
 	public boolean isToolUseStart(StreamEvent event) {
-		if (event == null || event.type() == null || event.type() != EventType.CONTENT_BLOCK_START) {
+		if (isInvalidEvent(event, EventType.CONTENT_BLOCK_START)) {
 			return false;
 		}
-		return ContentBlock.Type.TOOL_USE.getValue().equals(((ContentBlockStartEvent) event).contentBlock().type());
+		ContentBlockStartEvent contentBlockStartEvent = (ContentBlockStartEvent) event;
+		return ContentBlock.Type.TOOL_USE.getValue().equals(contentBlockStartEvent.contentBlock().type());
 	}
 
 	public boolean isToolUseFinish(StreamEvent event) {
+		return !isInvalidEvent(event, EventType.CONTENT_BLOCK_STOP);
+	}
 
-		if (event == null || event.type() == null || event.type() != EventType.CONTENT_BLOCK_STOP) {
-			return false;
-		}
-		return true;
+	private boolean isInvalidEvent(StreamEvent event, EventType expectedType) {
+		return event == null || event.type() == null || event.type() != expectedType;
 	}
 
 	public StreamEvent mergeToolUseEvents(StreamEvent previousEvent, StreamEvent event) {