diff --git a/scripts/src/hwlab-node-web-observe-runner-source.ts b/scripts/src/hwlab-node-web-observe-runner-source.ts
index 7c380872..ef30cc2d 100644
--- a/scripts/src/hwlab-node-web-observe-runner-source.ts
+++ b/scripts/src/hwlab-node-web-observe-runner-source.ts
@@ -369,7 +369,13 @@ async function sendPrompt(text) {
   if (chatStatus < 200 || chatStatus >= 300) {
     throw new Error("sendPrompt observed POST /v1/agent/chat HTTP " + chatStatus + " " + chatResponse.statusText());
   }
-  return { beforeUrl, afterUrl: currentPageUrl(), textHash: sha256Text(text), textBytes: Buffer.byteLength(text), chatSubmit: { status: chatStatus, statusText: chatResponse.statusText(), urlPath: urlPath(chatResponse.url()) }, pageId };
+  let chatUrlPath = "/v1/agent/chat";
+  try {
+    chatUrlPath = new URL(chatResponse.url()).pathname;
+  } catch {
+    chatUrlPath = "/v1/agent/chat";
+  }
+  return { beforeUrl, afterUrl: currentPageUrl(), textHash: sha256Text(text), textBytes: Buffer.byteLength(text), chatSubmit: { status: chatStatus, statusText: chatResponse.statusText(), urlPath: chatUrlPath }, pageId };
 }
 
 async function selectProvider(provider) {