diff --git a/src/main/java/org/opensearch/agent/tools/RAGTool.java b/src/main/java/org/opensearch/agent/tools/RAGTool.java
index a88930fd..e3670bd0 100644
--- a/src/main/java/org/opensearch/agent/tools/RAGTool.java
+++ b/src/main/java/org/opensearch/agent/tools/RAGTool.java
@@ -90,7 +90,6 @@ public RAGTool(
         this.docSize = docSize == null ? DEFAULT_DOC_SIZE : docSize;
         this.k = k == null ? DEFAULT_K : k;
         this.inferenceModelId = inferenceModelId;
-
         outputParser = new Parser() {
             @Override
             public Object parse(Object o) {
@@ -115,8 +114,7 @@ public <T> void run(Map<String, String> parameters, ActionListener<T> listener)
         }
 
         try {
-            String question = parameters.get(INPUT_FIELD);
-            input = gson.fromJson(question, String.class);
+            input = parameters.get(INPUT_FIELD);
         } catch (Exception e) {
             log.error("Failed to read question from " + INPUT_FIELD, e);
             listener.onFailure(new IllegalArgumentException("Failed to read question from " + INPUT_FIELD));
diff --git a/src/main/java/org/opensearch/agent/tools/VectorDBTool.java b/src/main/java/org/opensearch/agent/tools/VectorDBTool.java
index aea3a01c..dfbbed26 100644
--- a/src/main/java/org/opensearch/agent/tools/VectorDBTool.java
+++ b/src/main/java/org/opensearch/agent/tools/VectorDBTool.java
@@ -28,6 +28,9 @@
 @ToolAnnotation(VectorDBTool.TYPE)
 public class VectorDBTool extends AbstractRetrieverTool {
     public static final String TYPE = "VectorDBTool";
+
+    public static String DEFAULT_DESCRIPTION =
+        "Use this tool to performs knn-based dense retrieval. It takes 1 argument named input which is a string query for dense retrieval. The tool returns the dense retrieval results for the query.";
     public static final String MODEL_ID_FIELD = "model_id";
     public static final String EMBEDDING_FIELD = "embedding_field";
     public static final String K_FIELD = "k";
diff --git a/src/test/java/org/opensearch/agent/tools/RAGToolTests.java b/src/test/java/org/opensearch/agent/tools/RAGToolTests.java
index 79bfcebf..8ef43468 100644
--- a/src/test/java/org/opensearch/agent/tools/RAGToolTests.java
+++ b/src/test/java/org/opensearch/agent/tools/RAGToolTests.java
@@ -203,6 +203,36 @@ public void testRunWithEmptySearchResponse() throws IOException {
         verify(client).execute(any(), any(), any());
     }
 
+    @Test
+    public void testRunWithQuestionJson() throws IOException {
+        NamedXContentRegistry mockNamedXContentRegistry = getNeuralQueryNamedXContentRegistry();
+        ragTool.setXContentRegistry(mockNamedXContentRegistry);
+
+        ModelTensorOutput mlModelTensorOutput = getMlModelTensorOutput();
+        SearchResponse mockedEmptySearchResponse = SearchResponse
+            .fromXContent(
+                JsonXContent.jsonXContent
+                    .createParser(NamedXContentRegistry.EMPTY, DeprecationHandler.IGNORE_DEPRECATIONS, mockedEmptySearchResponseString)
+            );
+
+        doAnswer(invocation -> {
+            SearchRequest searchRequest = invocation.getArgument(0);
+            assertEquals((long) TEST_DOC_SIZE, (long) searchRequest.source().size());
+            ActionListener<SearchResponse> listener = invocation.getArgument(1);
+            listener.onResponse(mockedEmptySearchResponse);
+            return null;
+        }).when(client).search(any(), any());
+
+        doAnswer(invocation -> {
+            ActionListener<MLTaskResponse> actionListener = invocation.getArgument(2);
+            actionListener.onResponse(MLTaskResponse.builder().output(mlModelTensorOutput).build());
+            return null;
+        }).when(client).execute(eq(MLPredictionTaskAction.INSTANCE), any(), any());
+        ragTool.run(Map.of(INPUT_FIELD, "{question:'what is the population in seattle?'}"), listener);
+        verify(client).search(any(), any());
+        verify(client).execute(any(), any(), any());
+    }
+
     @Test
     @SneakyThrows
     public void testRunWithRuntimeExceptionDuringSearch() {
@@ -261,17 +291,6 @@ public void testRunWithEmptyInput() {
         ragTool.run(Map.of(INPUT_FIELD, ""), listener);
     }
 
-    @Test
-    public void testRunWithMalformedInput() throws IOException {
-        ActionListener listener = mock(ActionListener.class);
-        ragTool.run(Map.of(INPUT_FIELD, "{hello?"), listener);
-        verify(listener).onFailure(any(RuntimeException.class));
-        ArgumentCaptor<Exception> argumentCaptor = ArgumentCaptor.forClass(Exception.class);
-        verify(listener).onFailure(argumentCaptor.capture());
-        assertEquals("Failed to read question from " + INPUT_FIELD, argumentCaptor.getValue().getMessage());
-
-    }
-
     @Test
     public void testFactory() {
         RAGTool.Factory factoryMock = new RAGTool.Factory();