diff --git a/src/main/java/org/opensearch/agent/tools/RCATool.java b/src/main/java/org/opensearch/agent/tools/RCATool.java
index 94d62ef5..fc0e3b80 100644
--- a/src/main/java/org/opensearch/agent/tools/RCATool.java
+++ b/src/main/java/org/opensearch/agent/tools/RCATool.java
@@ -7,7 +7,6 @@
 
 import static org.apache.commons.text.StringEscapeUtils.unescapeJson;
 
-import java.io.IOException;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -23,10 +22,9 @@
 import org.opensearch.action.admin.cluster.allocation.ClusterAllocationExplainResponse;
 import org.opensearch.agent.tools.utils.ClusterStatsUtil;
 import org.opensearch.client.Client;
-import org.opensearch.common.xcontent.XContentFactory;
+import org.opensearch.cluster.routing.allocation.NodeAllocationResult;
+import org.opensearch.cluster.routing.allocation.decider.Decision;
 import org.opensearch.core.action.ActionListener;
-import org.opensearch.core.xcontent.ToXContent;
-import org.opensearch.core.xcontent.XContentBuilder;
 import org.opensearch.ml.common.FunctionName;
 import org.opensearch.ml.common.dataset.remote.RemoteInferenceInputDataSet;
 import org.opensearch.ml.common.input.MLInput;
@@ -86,9 +84,12 @@ public boolean validate(Map<String, String> parameters) {
             + "Human: PHENOMENON\n"
             + "--------------------\n"
             + "${parameters.phenomenon} \n\n"
-            + "Human: POTENTIAL CAUSES AND RESPONSE\n"
+            + "Human: POTENTIAL CAUSES\n"
             + "--------------------\n"
             + "${parameters.causes} \n\n"
+            + "Human: API RESPONSES\n"
+            + "${parameters.responses} \n\n"
+            + "--------------------\n"
             + "Assistant: ";
 
     @SuppressWarnings("unchecked")
@@ -101,9 +102,16 @@ public <T> void runOption1(Map<String, String> parameters, ActionListener<T> lis
         ActionListener<Map<String, String>> apiListener = new ActionListener<>() {
             @Override
             public void onResponse(Map<String, String> apiToResponse) {
-                causes.forEach(cause -> cause.put("response", apiToResponse.get(cause.get(API_URL_FIELD))));
                 Map<String, String> LLMParams = new java.util.HashMap<>(
-                    Map.of("phenomenon", (String) knowledgeBase.get("phenomenon"), "causes", StringUtils.gson.toJson(causes))
+                    Map
+                        .of(
+                            "phenomenon",
+                            (String) knowledgeBase.get("phenomenon"),
+                            "causes",
+                            StringUtils.gson.toJson(causes),
+                            "responses",
+                            StringUtils.gson.toJson(apiToResponse)
+                        )
                 );
                 StringSubstitutor substitute = new StringSubstitutor(LLMParams, "${parameters.", "}");
                 String finalToolPrompt = substitute.replace(TOOL_PROMPT);
@@ -200,15 +208,19 @@ private void invokeAPI(String url, Map<String, String> parameters, ActionListene
                 ActionListener<ClusterAllocationExplainResponse> apiListener = new ActionListener<>() {
                     @Override
                     public void onResponse(ClusterAllocationExplainResponse allocationExplainResponse) {
-                        try {
-                            XContentBuilder xContentBuilder = allocationExplainResponse
-                                .getExplanation()
-                                .toXContent(XContentFactory.jsonBuilder(), ToXContent.EMPTY_PARAMS);
-                            listener.onResponse(xContentBuilder.toString());
-                        } catch (IOException e) {
-                            log.error("Failed to invoke api _cluster/allocation/explain due to exception:", e);
-                            listener.onFailure(e);
+                        List<NodeAllocationResult> nodeDecisions = allocationExplainResponse
+                            .getExplanation()
+                            .getShardAllocationDecision()
+                            .getAllocateDecision()
+                            .getNodeDecisions();
+                        StringBuilder stringBuilder = new StringBuilder();
+                        for (NodeAllocationResult nodeDecision : nodeDecisions) {
+                            List<Decision> decisions = nodeDecision.getCanAllocateDecision().getDecisions();
+                            for (Decision decision : decisions) {
+                                stringBuilder.append(decision.getExplanation());
+                            }
                         }
+                        listener.onResponse(stringBuilder.toString());
                     }
 
                     @Override