diff --git a/scripts/src/hwlab-node-web-observe-runner-source.ts b/scripts/src/hwlab-node-web-observe-runner-source.ts
index 9cad5419..7751d977 100644
--- a/scripts/src/hwlab-node-web-observe-runner-source.ts
+++ b/scripts/src/hwlab-node-web-observe-runner-source.ts
@@ -541,7 +541,7 @@ async function sendPrompt(text) {
     chatUrlPath = "/v1/agent/chat";
   }
   const payloadText = chatPayload ? JSON.stringify(chatPayload) : "";
-  const traceId = firstTraceId([payloadText]);
+  const traceId = payloadText.match(/\btrc_[A-Za-z0-9_-]+\b/u)?.[0] || null;
   const otelTraceId = typeof chatPayload?.otelTrace?.traceId === "string" && /^[0-9a-f]{32}$/u.test(chatPayload.otelTrace.traceId)
     ? chatPayload.otelTrace.traceId
     : null;