diff --git a/neode-ui/mock-backend.js b/neode-ui/mock-backend.js
index 397896b7..0a9877b8 100755
--- a/neode-ui/mock-backend.js
+++ b/neode-ui/mock-backend.js
@@ -1031,10 +1031,14 @@ app.post('/aiui/api/claude/*', (req, res) => {
 
   const apiPath = '/' + req.params[0]
 
-  // Ensure max_tokens is set — Claude API requires it but AIUI may omit it
+  // Clean request body for Anthropic API
   const body = req.body
-  if (body && !body.max_tokens) {
-    body.max_tokens = 4096
+  if (body) {
+    if (!body.max_tokens) body.max_tokens = 4096
+    // Strip AIUI-specific fields that Anthropic API rejects
+    delete body.webSearch
+    delete body.webResults
+    delete body.context
   }
 
   const bodyStr = JSON.stringify(body)