diff --git a/vision_agent/tools/tool_utils.py b/vision_agent/tools/tool_utils.py
index 1b85446b..605f5511 100644
--- a/vision_agent/tools/tool_utils.py
+++ b/vision_agent/tools/tool_utils.py
@@ -208,19 +208,25 @@ def _call_post(
     if files:
         files_in_b64 = [(file[0], b64encode(file[1]).decode("utf-8")) for file in files]
     try:
+        if files is not None:
+            response = session.post(url, data=payload, files=files)
+        else:
+            response = session.post(url, json=payload)
+
+        # make sure function_name is in the payload so we can display it
+        tool_call_trace_payload = (
+            payload
+            if "function_name" in payload
+            else {**payload, **{"function_name": function_name}}
+        )
         tool_call_trace = ToolCallTrace(
             endpoint_url=url,
-            request=payload,
+            request=tool_call_trace_payload,
             response={},
             error=None,
             files=files_in_b64,
         )
 
-        if files is not None:
-            response = session.post(url, data=payload, files=files)
-        else:
-            response = session.post(url, json=payload)
-
         if response.status_code != 200:
             tool_call_trace.error = Error(
                 name="RemoteToolCallFailed",