diff --git a/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/agent/MLChatAgentRunner.java b/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/agent/MLChatAgentRunner.java
index 4740565dd1..4b14f1af17 100644
--- a/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/agent/MLChatAgentRunner.java
+++ b/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/agent/MLChatAgentRunner.java
@@ -473,7 +473,10 @@ private static void runTool(
                     llmToolTmpParameters.put(MLAgentExecutor.QUESTION, actionInput);
                     tools.get(action).run(llmToolTmpParameters, toolListener); // run tool
                 } else {
-                    tools.get(action).run(toolParams, toolListener); // run tool
+                    Map<String, String> parameters = new HashMap<>();
+                    parameters.putAll(tmpParameters);
+                    parameters.putAll(toolParams);
+                    tools.get(action).run(parameters, toolListener); // run tool
                 }
             } catch (Exception e) {
                 nextStepListener
diff --git a/ml-algorithms/src/test/java/org/opensearch/ml/engine/algorithms/agent/MLChatAgentRunnerTest.java b/ml-algorithms/src/test/java/org/opensearch/ml/engine/algorithms/agent/MLChatAgentRunnerTest.java
index 760d9f9c06..0d7d24eddc 100644
--- a/ml-algorithms/src/test/java/org/opensearch/ml/engine/algorithms/agent/MLChatAgentRunnerTest.java
+++ b/ml-algorithms/src/test/java/org/opensearch/ml/engine/algorithms/agent/MLChatAgentRunnerTest.java
@@ -121,7 +121,7 @@ public class MLChatAgentRunnerTest {
     @Captor
     private ArgumentCaptor<ActionListener<UpdateResponse>> mlMemoryManagerCapture;
     @Captor
-    private ArgumentCaptor<Map<String, String>> ToolParamsCapture;
+    private ArgumentCaptor<Map<String, String>> toolParamsCapture;
 
     @Before
     @SuppressWarnings("unchecked")
@@ -706,7 +706,7 @@ public void testToolParameters() {
         // Verify the size of parameters passed in the tool run method.
         ArgumentCaptor argumentCaptor = ArgumentCaptor.forClass(Map.class);
         verify(firstTool).run((Map<String, String>) argumentCaptor.capture(), any());
-        assertEquals(3, ((Map) argumentCaptor.getValue()).size());
+        assertEquals(14, ((Map) argumentCaptor.getValue()).size());
 
         Mockito.verify(agentActionListener).onResponse(objectCaptor.capture());
         ModelTensorOutput modelTensorOutput = (ModelTensorOutput) objectCaptor.getValue();
@@ -734,7 +734,7 @@ public void testToolUseOriginalInput() {
         // Verify the size of parameters passed in the tool run method.
         ArgumentCaptor argumentCaptor = ArgumentCaptor.forClass(Map.class);
         verify(firstTool).run((Map<String, String>) argumentCaptor.capture(), any());
-        assertEquals(3, ((Map) argumentCaptor.getValue()).size());
+        assertEquals(15, ((Map) argumentCaptor.getValue()).size());
         assertEquals("raw input", ((Map<?, ?>) argumentCaptor.getValue()).get("input"));
 
         Mockito.verify(agentActionListener).onResponse(objectCaptor.capture());
@@ -767,6 +767,58 @@ public void testSaveLastTraceFailure() {
         Mockito.verify(agentActionListener).onFailure(any(IllegalArgumentException.class));
     }
 
+    @Test
+    public void testToolExecutionWithChatHistoryParameter() {
+        LLMSpec llmSpec = LLMSpec.builder().modelId("MODEL_ID").parameters(Map.of("max_iteration", "1")).build();
+        MLToolSpec firstToolSpec = MLToolSpec
+            .builder()
+            .name(FIRST_TOOL)
+            .parameters(Map.of("firsttoolspec", "firsttoolspec"))
+            .description("first tool spec")
+            .type(FIRST_TOOL)
+            .includeOutputInAgentResponse(false)
+            .build();
+        MLToolSpec secondToolSpec = MLToolSpec
+            .builder()
+            .name(SECOND_TOOL)
+            .parameters(Map.of("secondtoolspec", "secondtoolspec"))
+            .description("second tool spec")
+            .type(SECOND_TOOL)
+            .includeOutputInAgentResponse(true)
+            .build();
+        final MLAgent mlAgent = MLAgent
+            .builder()
+            .name("TestAgent")
+            .type(MLAgentType.CONVERSATIONAL.name())
+            .memory(mlMemorySpec)
+            .llm(llmSpec)
+            .description("mlagent description")
+            .tools(Arrays.asList(firstToolSpec, secondToolSpec))
+            .build();
+
+        doAnswer(invocation -> {
+            ActionListener<List<Interaction>> listener = invocation.getArgument(0);
+            List<Interaction> interactionList = generateInteractions(2);
+            Interaction inProgressInteraction = Interaction.builder().id("interaction-99").input("input-99").response(null).build();
+            interactionList.add(inProgressInteraction);
+            listener.onResponse(interactionList);
+            return null;
+        }).when(conversationIndexMemory).getMessages(memoryInteractionCapture.capture(), messageHistoryLimitCapture.capture());
+
+        doAnswer(generateToolResponse("First tool response"))
+            .when(firstTool)
+            .run(toolParamsCapture.capture(), toolListenerCaptor.capture());
+
+        HashMap<String, String> params = new HashMap<>();
+        params.put(MESSAGE_HISTORY_LIMIT, "5");
+        mlChatAgentRunner.run(mlAgent, params, agentActionListener);
+        Mockito.verify(agentActionListener).onResponse(objectCaptor.capture());
+        String chatHistory = params.get(MLChatAgentRunner.CHAT_HISTORY);
+        Assert.assertFalse(chatHistory.contains("input-99"));
+        Assert.assertEquals(5, messageHistoryLimitCapture.getValue().intValue());
+        Assert.assertTrue(toolParamsCapture.getValue().containsKey(MLChatAgentRunner.CHAT_HISTORY));
+    }
+
     // Helper methods to create MLAgent and parameters
     private MLAgent createMLAgentWithTools() {
         LLMSpec llmSpec = LLMSpec.builder().modelId("MODEL_ID").build();