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 dab3f77..1e7d3a3 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
@@ -2,6 +2,7 @@ package io.shinhanlife.axhub.biz.mcp.gateway.service;
 
 import io.shinhanlife.axhub.common.mcp.security.SecurityProperties;
 import io.shinhanlife.axhub.biz.mcp.gateway.registry.RedisRegistryService;
+import io.shinhanlife.axhub.biz.mcp.gateway.dto.ToolMetadata;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Component;
@@ -36,8 +37,17 @@ public class ToolPlanner {
         var toolMetadata = redisRegistryService.getTool(toolName);
 
         if (toolMetadata == null) {
-            log.warn(" [Planner] 등록되지 않은 툴 요청: {}", toolName);
-            throw new RuntimeException("해당 툴(" + toolName + ")이 레지스트리에 존재하지 않습니다.");
+            log.warn(" [Planner] 등록되지 않은 툴 요청: {}. 레지스트리를 참조하지 않고 강제 연동 모드로 전환합니다.", toolName);
+            // 히든 툴(register=false)에 대한 강제 라우팅 폴백
+            String fallbackPodUrl = "http://tool-other:8084"; // 기본값 (get_template_file_url 등)
+            if (toolName.contains("email")) fallbackPodUrl = "http://tool-email:8083";
+            else if (toolName.contains("sms")) fallbackPodUrl = "http://tool-sms:8082";
+
+            toolMetadata = ToolMetadata.builder()
+                .toolName(toolName)
+                .integrationType("DIRECT")
+                .podUrl(fallbackPodUrl)
+                .build();
         }
 
         // 2-1. [신규] 도메인 그룹핑 기반 권한 검증
diff --git a/axhub-gateway/src/main/resources/static/playground.html b/axhub-gateway/src/main/resources/static/playground.html
index 93522f3..fcfeb8b 100644
--- a/axhub-gateway/src/main/resources/static/playground.html
+++ b/axhub-gateway/src/main/resources/static/playground.html
@@ -234,6 +234,21 @@
                     <!-- Fields will be dynamically injected here -->
                 </div>
 
+                <!-- NEW: Manual Input Container for Hidden Tools -->
+                <div id="manualInputContainer" class="grid grid-cols-1 gap-4 mt-4 p-5 bg-slate-900/40 rounded-xl border border-rose-500/30 hidden">
+                    <div class="col-span-full">
+                        <h3 class="text-sm font-bold text-rose-400 mb-2 border-b border-rose-500/20 pb-2">히든 툴 직접 입력 (Manual Override)</h3>
+                    </div>
+                    <div class="group">
+                        <label class="block text-xs font-bold text-slate-400 mb-2">실행할 툴 이름 (Tool Name)</label>
+                        <input type="text" id="manualToolName" class="input-premium block w-full py-2 px-3 text-sm rounded-lg" value="get_template_file_url" placeholder="예: get_template_file_url">
+                    </div>
+                    <div class="group">
+                        <label class="block text-xs font-bold text-slate-400 mb-2">파라미터 (JSON 형식)</label>
+                        <textarea id="manualToolArgs" rows="3" class="input-premium block w-full py-2 px-3 text-sm rounded-lg font-mono" placeholder='{"templateId": "test"}'>{"templateId": "test_excel"}</textarea>
+                    </div>
+                </div>
+
                 <div class="group pt-2">
                     <label for="userPrompt" class="flex items-center text-xs font-bold text-slate-400 mb-2 uppercase tracking-widest transition-colors group-focus-within:text-brand-400">
                         <svg class="w-3.5 h-3.5 mr-1.5" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 10h.01M12 10h.01M16 10h.01M9 16H5a2 2 0 01-2-2V6a2 2 0 012-2h14a2 2 0 012 2v8a2 2 0 01-2 2h-5l-5 5v-5z"></path></svg>
@@ -297,11 +312,6 @@
 
                 const tools = data.result?.tools || [];
                 
-                if (tools.length === 0) {
-                    toolSelect.innerHTML = '<option value="">등록된 툴이 없습니다</option>';
-                    return;
-                }
-
                 const groupedTools = {};
                 tools.forEach(tool => {
                     const group = tool.domainGroup || '기타 그룹';
@@ -327,6 +337,17 @@
                     });
                     toolSelect.appendChild(optgroup);
                 });
+
+                // Add Manual Input Option
+                const optgroupManual = document.createElement('optgroup');
+                optgroupManual.label = '고급 (Advanced)';
+                const optionManual = document.createElement('option');
+                optionManual.value = 'MANUAL_INPUT';
+                optionManual.textContent = '🛠️ 비공개 툴 직접 입력 (Hidden Tool Test)';
+                optionManual.dataset.schema = "null";
+                optgroupManual.appendChild(optionManual);
+                toolSelect.appendChild(optgroupManual);
+
             } catch (err) {
                 toolSelect.innerHTML = '<option value="">데이터 로드 실패</option>';
             }
@@ -398,8 +419,15 @@
         }
 
         toolSelect.addEventListener('change', () => {
-            updatePrompt();
-            renderDynamicForm();
+            if (toolSelect.value === 'MANUAL_INPUT') {
+                document.getElementById('manualInputContainer').classList.remove('hidden');
+                dynamicFormContainer.classList.add('hidden');
+                document.getElementById('userPrompt').value = "숨겨진 툴 강제 호출 테스트";
+            } else {
+                document.getElementById('manualInputContainer').classList.add('hidden');
+                updatePrompt();
+                renderDynamicForm();
+            }
         });
 
         document.addEventListener('DOMContentLoaded', fetchTools);
@@ -429,6 +457,26 @@
                 return;
             }
             
+            let finalToolName = toolSelect.value;
+            let finalArguments = {};
+
+            if (finalToolName === 'MANUAL_INPUT') {
+                finalToolName = document.getElementById('manualToolName').value.trim();
+                if (!finalToolName) {
+                    alert("실행할 히든 툴의 이름을 입력해주세요.");
+                    return;
+                }
+                try {
+                    const argsVal = document.getElementById('manualToolArgs').value.trim();
+                    finalArguments = argsVal ? JSON.parse(argsVal) : {};
+                } catch(err) {
+                    alert("JSON 파라미터 형식이 올바르지 않습니다.");
+                    return;
+                }
+            } else {
+                finalArguments = collectArguments();
+            }
+
             const loadingOverlay = document.getElementById('loadingOverlay');
             const resultContainer = document.getElementById('resultContainer');
             const jsonResponse = document.getElementById('jsonResponse');
@@ -439,14 +487,12 @@
 
             loadingOverlay.classList.add('active');
             
-            const actualArguments = collectArguments();
-
             const payload = {
                 jsonrpc: "2.0",
                 method: "tools/call",
                 params: {
-                    name: toolSelect.value,
-                    arguments: actualArguments
+                    name: finalToolName,
+                    arguments: finalArguments
                 },
                 id: Math.floor(Math.random() * 10000)
             };
diff --git a/axhub-tool-core/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/controller/BusinessToolController.java b/axhub-tool-core/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/controller/BusinessToolController.java
index c35cc84..87d9de6 100644
--- a/axhub-tool-core/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/controller/BusinessToolController.java
+++ b/axhub-tool-core/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/controller/BusinessToolController.java
@@ -82,21 +82,8 @@ public class BusinessToolController {
             return error;
         }
 
-        // --- 비공개 툴(register=false)에 대한 강제 실행 접근 원천 차단 로직 ---
-        McpProperties.FunctionProp prop = null;
-        if (mcpProperties != null && mcpProperties.getFunctions() != null) {
-            prop = mcpProperties.getFunctions().get(targetFunctionAnnotation.name());
-        }
-        boolean isRegister = prop != null && prop.getRegister() != null ? prop.getRegister() : targetFunctionAnnotation.register();
-
-        if (!isRegister) {
-            log.warn("[Tool] 비공개 툴에 대한 강제 접근 시도 차단: {}", functionName);
-            Map<String, Object> error = new HashMap<>();
-            error.put("jsonrpc", "2.0");
-            error.put("error", Map.of("code", -32001, "message", "접근이 차단된 비공개 툴입니다: " + functionName));
-            error.put("id", payload != null ? payload.get("id") : null);
-            return error;
-        }
+        // --- 비공개 툴(register=false)은 외부 노출(Redis)만 제외하고, 직접 실행은 허용하도록 변경 ---
+        // (기존 차단 로직 제거됨)
 
         // 2. 파라미터 유효성 검증 (JSON Schema)
         if (targetMethod.getParameterCount() > 0) {
diff --git a/axhub-tool-other/src/main/resources/application.properties b/axhub-tool-other/src/main/resources/application.properties
index 4f0d492..dca90a4 100644
--- a/axhub-tool-other/src/main/resources/application.properties
+++ b/axhub-tool-other/src/main/resources/application.properties
@@ -5,6 +5,3 @@ spring.profiles.active=local
 
 # Suppress Kafka Connection Logs
 logging.level.org.apache.kafka=ERROR
-
-# MCP Function Register overrides
-mcp.functions.get_template_file_url.register=true