diff --git a/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/agent/AgentUtils.java b/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/agent/AgentUtils.java
index f7493e31fc..8d01c59bf2 100644
--- a/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/agent/AgentUtils.java
+++ b/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/agent/AgentUtils.java
@@ -60,6 +60,7 @@ public class AgentUtils {
     public static final String PROMPT_CHAT_HISTORY_PREFIX = "prompt.chat_history_prefix";
     public static final String DISABLE_TRACE = "disable_trace";
     public static final String VERBOSE = "verbose";
+    public static final String LLM_GEN_INPUT = "llm_generated_input";
 
     public static String addExamplesToPrompt(Map<String, String> parameters, String prompt) {
         Map<String, String> examplesMap = new HashMap<>();
@@ -472,7 +473,7 @@ public static Map<String, String> constructToolParams(
         if (toolSpecConfigMap != null) {
             toolParams.putAll(toolSpecConfigMap);
         }
-        toolParams.put("llm_generated_action_input", actionInput);
+        toolParams.put(LLM_GEN_INPUT, actionInput);
         if (isJson(actionInput)) {
             Map<String, String> params = getParameterMap(gson.fromJson(actionInput, Map.class));
             toolParams.putAll(params);
diff --git a/ml-algorithms/src/test/java/org/opensearch/ml/engine/algorithms/agent/AgentUtilsTest.java b/ml-algorithms/src/test/java/org/opensearch/ml/engine/algorithms/agent/AgentUtilsTest.java
index 0227c77ed3..c2bf05205a 100644
--- a/ml-algorithms/src/test/java/org/opensearch/ml/engine/algorithms/agent/AgentUtilsTest.java
+++ b/ml-algorithms/src/test/java/org/opensearch/ml/engine/algorithms/agent/AgentUtilsTest.java
@@ -8,6 +8,7 @@
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertThrows;
 import static org.mockito.Mockito.when;
+import static org.opensearch.ml.engine.algorithms.agent.AgentUtils.LLM_GEN_INPUT;
 import static org.opensearch.ml.engine.algorithms.agent.AgentUtils.PROMPT_PREFIX;
 import static org.opensearch.ml.engine.algorithms.agent.AgentUtils.PROMPT_SUFFIX;
 import static org.opensearch.ml.engine.algorithms.agent.MLChatAgentRunner.ACTION;
@@ -608,7 +609,7 @@ public void testConstructToolParams() {
             Assert.assertEquals("abc", toolParams.get("detectorName"));
             Assert.assertEquals("sample-data", toolParams.get("indices"));
             Assert.assertEquals("value1", toolParams.get("key1"));
-            Assert.assertEquals(actionInput, toolParams.get("llm_generated_action_input"));
+            Assert.assertEquals(actionInput, toolParams.get(LLM_GEN_INPUT));
         });
     }
 
@@ -619,7 +620,7 @@ public void testConstructToolParamsNullActionInput() {
         verifyConstructToolParams(question, actionInput, (toolParams) -> {
             Assert.assertEquals(3, toolParams.size());
             Assert.assertEquals("value1", toolParams.get("key1"));
-            Assert.assertNull(toolParams.get("llm_generated_action_input"));
+            Assert.assertNull(toolParams.get(LLM_GEN_INPUT));
             Assert.assertNull(toolParams.get("input"));
         });
     }
@@ -633,7 +634,7 @@ public void testConstructToolParams_UseOriginalInput() {
             Assert.assertEquals(5, toolParams.size());
             Assert.assertEquals(question, toolParams.get("input"));
             Assert.assertEquals("value1", toolParams.get("key1"));
-            Assert.assertEquals(actionInput, toolParams.get("llm_generated_action_input"));
+            Assert.assertEquals(actionInput, toolParams.get(LLM_GEN_INPUT));
             Assert.assertEquals("sample-data", toolParams.get("indices"));
             Assert.assertEquals("abc", toolParams.get("detectorName"));
         });
@@ -652,7 +653,7 @@ public void testConstructToolParams_PlaceholderConfigInput() {
                     .builder()
                     .type("tool1")
                     .parameters(Map.of("key1", "value1"))
-                    .configMap(Map.of("input", preConfigInputStr + "${parameters.llm_generated_action_input}"))
+                    .configMap(Map.of("input", preConfigInputStr + "${parameters.llm_generated_input}"))
                     .build()
             );
         AtomicReference<String> lastActionInput = new AtomicReference<>();
@@ -661,7 +662,7 @@ public void testConstructToolParams_PlaceholderConfigInput() {
         Assert.assertEquals(3, toolParams.size());
         Assert.assertEquals(preConfigInputStr + actionInput, toolParams.get("input"));
         Assert.assertEquals("value1", toolParams.get("key1"));
-        Assert.assertEquals(actionInput, toolParams.get("llm_generated_action_input"));
+        Assert.assertEquals(actionInput, toolParams.get(LLM_GEN_INPUT));
     }
 
     @Test
@@ -686,7 +687,7 @@ public void testConstructToolParams_PlaceholderConfigInputJson() {
         Assert.assertEquals(5, toolParams.size());
         Assert.assertEquals(preConfigInputStr + "abc", toolParams.get("input"));
         Assert.assertEquals("value1", toolParams.get("key1"));
-        Assert.assertEquals(actionInput, toolParams.get("llm_generated_action_input"));
+        Assert.assertEquals(actionInput, toolParams.get(LLM_GEN_INPUT));
     }
 
     private void verifyConstructToolParams(String question, String actionInput, Consumer<Map<String, String>> verify) {