diff --git a/web/app/components/tools/mcp/modal.tsx b/web/app/components/tools/mcp/modal.tsx
index 0e57cb149..88e831bc3 100644
--- a/web/app/components/tools/mcp/modal.tsx
+++ b/web/app/components/tools/mcp/modal.tsx
@@ -70,7 +70,7 @@ const MCPModal = ({
 
   const isValidUrl = (string: string) => {
     try {
-      const urlPattern = /^(https?:\/\/)((([a-z\d]([a-z\d-]*[a-z\d])*)\.)+[a-z]{2,}|((\d{1,3}\.){3}\d{1,3}))(\:\d+)?(\/[-a-z\d%_.~+]*)*(\?[;&a-z\d%_.~+=-]*)?/i
+      const urlPattern = /^(https?:\/\/)((([a-z\d]([a-z\d-]*[a-z\d])*)\.)+[a-z]{2,}|((\d{1,3}\.){3}\d{1,3})|localhost)(\:\d+)?(\/[-a-z\d%_.~+]*)*(\?[;&a-z\d%_.~+=-]*)?/i
       return urlPattern.test(string)
     }
     catch (e) {