feat: Allow max tokens to be customizable in Claude

PiperOrigin-RevId: 789658952

Author: shukladivyansh

core/src/main/java/com/google/adk/models/Claude.java

@@ -60,7 +60,7 @@
 public class Claude extends BaseLlm {
 
   private static final Logger logger = LoggerFactory.getLogger(Claude.class);
-  private static final int MAX_TOKEN = 8192;
+  private int maxTokens = 8192;
   private final AnthropicClient anthropicClient;
 
   /**
@@ -74,6 +74,12 @@ public Claude(String modelName, AnthropicClient anthropicClient) {
     this.anthropicClient = anthropicClient;
   }
 
+  public Claude(String modelName, AnthropicClient anthropicClient, int maxTokens) {
+    super(modelName);
+    this.anthropicClient = anthropicClient;
+    this.maxTokens = maxTokens;
+  }
+
   @Override
   public Flowable<LlmResponse> generateContent(LlmRequest llmRequest, boolean stream) {
     // TODO: Switch to streaming API.
@@ -125,7 +131,7 @@ public Flowable<LlmResponse> generateContent(LlmRequest llmRequest, boolean stre
                     .messages(messages)
                     .tools(tools)
                     .toolChoice(toolChoice)
-                    .maxTokens(MAX_TOKEN)
+                    .maxTokens(this.maxTokens)
                     .build());
 
     logger.debug("Claude response: {}", message);