diff --git a/apps/api/src/plugins/mcp/providers/k8s_provider.py b/apps/api/src/plugins/mcp/providers/k8s_provider.py
index d904a426..f8ea4222 100644
--- a/apps/api/src/plugins/mcp/providers/k8s_provider.py
+++ b/apps/api/src/plugins/mcp/providers/k8s_provider.py
@@ -336,6 +336,13 @@ class K8sProvider(MCPToolProvider):
         if not deployment:
             return {"error": "Missing 'deployment' parameter"}
 
+        # 2026-04-27 ogt + Claude Sonnet 4.6: 補 dry-run 驗證，與 _kubectl_restart 對齊
+        # 根因：_kubectl_scale 缺 validate_deployment_exists → gitea（docker-compose 服務）
+        #       直接被 kubectl scale → K8s not found 執行失敗（INC-20260425-3B6C39 事故）
+        dry_run = await executor.validate_deployment_exists(deployment, namespace)
+        if not dry_run.passed:
+            return {"error": dry_run.message, "dry_run": False}
+
         cmd = f"kubectl scale deployment/{deployment} --replicas={replicas} -n {namespace}"
         result = await executor.execute_kubectl_command(cmd)