Omit optional fields with empty strings from tool calls

client/src/App.tsx

@@ -22,6 +22,7 @@ import { SESSION_KEYS, getServerSpecificKey } from "./lib/constants";
 import { AuthDebuggerState, EMPTY_DEBUGGER_STATE } from "./lib/auth-types";
 import { OAuthStateMachine } from "./lib/oauth-state-machine";
 import { cacheToolOutputSchemas } from "./utils/schemaUtils";
+import { cleanParams } from "./utils/paramUtils";
 import React, {
   Suspense,
   useCallback,
@@ -777,12 +778,18 @@ const App = () => {
     lastToolCallOriginTabRef.current = currentTabRef.current;
 
     try {
+      // Find the tool schema to clean parameters properly
+      const tool = tools.find(t => t.name === name);
+      const cleanedParams = tool?.inputSchema 
+        ? cleanParams(params, tool.inputSchema as any)
+        : params;
+
       const response = await sendMCPRequest(
         {
           method: "tools/call" as const,
           params: {
             name,
-            arguments: params,
+            arguments: cleanedParams,
             _meta: {
               progressToken: progressTokenRef.current++,
             },