diff --git a/axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/guardrail/GuardrailService.java b/axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/guardrail/GuardrailService.java
index 61db40a..ab3e274 100644
--- a/axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/guardrail/GuardrailService.java
+++ b/axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/guardrail/GuardrailService.java
@@ -20,6 +20,11 @@ public class GuardrailService {
      * ToolMetadata에 정의된 required/allowed arguments 기준으로 요청 인자를 검증합니다.
      */
     public void validate(ToolMetadata metadata, ObjectNode arguments) {
+        if (metadata.getParametersSchema() == null) {
+            // 스키마 정보가 없으면(Fallback 툴 등) 검증을 생략합니다.
+            return;
+        }
+
         Iterator<String> fieldNames = arguments.fieldNames();
         while (fieldNames.hasNext()) {
             String fieldName = fieldNames.next();
diff --git a/axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/service/ExecuteService.java b/axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/service/ExecuteService.java
index cf914a8..d5079c4 100644
--- a/axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/service/ExecuteService.java
+++ b/axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/service/ExecuteService.java
@@ -121,6 +121,11 @@ public class ExecuteService {
             }
 
             Object result = executeWithResilience(context, metadata, argumentsNode, payload);
+            
+            if (result instanceof com.fasterxml.jackson.databind.JsonNode) {
+                result = objectMapper.convertValue(result, Object.class);
+            }
+            
             long elapsedMillis = elapsedMillis(startedAt);
             
             String responseText = "";
diff --git a/axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/service/ToolPlanner.java b/axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/service/ToolPlanner.java
index 84e2f02..e3b7fda 100644
--- a/axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/service/ToolPlanner.java
+++ b/axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/service/ToolPlanner.java
@@ -74,6 +74,7 @@ public class ToolPlanner {
 
             toolMetadata = ToolMetadata.builder()
                 .uid(toolName)
+                .name(toolName)
                 .integrationType("DIRECT")
                 .podUrl(fallbackPodUrl)
                 .build();