diff --git a/src/main/java/org/opensearch/agent/tools/PPLTool.java b/src/main/java/org/opensearch/agent/tools/PPLTool.java
index 5a4a8a21..337cb077 100644
--- a/src/main/java/org/opensearch/agent/tools/PPLTool.java
+++ b/src/main/java/org/opensearch/agent/tools/PPLTool.java
@@ -495,8 +495,7 @@ private String getIndexNameFromParameters(Map<String, String> parameters) {
         if (!StringUtils.isBlank(this.previousToolKey) && StringUtils.isBlank(indexName)) {
             indexName = parameters.getOrDefault(this.previousToolKey + ".output", ""); // read index name from previous key
         }
-        return indexName;
-
+        return indexName.trim();
     }
 
     private static Map<String, String> loadDefaultPromptDict() throws IOException {