From 0912f984d12b440a3a811ba0d6523adddb54f34d Mon Sep 17 00:00:00 2001
From: Oxygen56 <1391083091@qq.com>
Date: Tue, 2 Jun 2026 02:03:01 +0800
Subject: [PATCH] fix(evaluation): skip invocations without user events to
 prevent ValidationError

Change user_content initialization from Content(parts=[]) to None and
skip invocations that have no user-authored events. This prevents
ValidationError from semantically incorrect empty Content objects.

Fixes #3760
---
 src/google/adk/evaluation/evaluation_generator.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/google/adk/evaluation/evaluation_generator.py b/src/google/adk/evaluation/evaluation_generator.py
index 5b0100818c..4f37d6b31e 100644
--- a/src/google/adk/evaluation/evaluation_generator.py
+++ b/src/google/adk/evaluation/evaluation_generator.py
@@ -627,7 +627,7 @@ def convert_events_to_eval_invocations(
     for invocation_id, events in events_by_invocation_id.items():
       final_response = None
       final_event = None
-      user_content = Content(parts=[])
+      user_content = None
       invocation_timestamp = 0
       app_details = None
       if (
@@ -663,6 +663,9 @@ def convert_events_to_eval_invocations(
               events_to_add.append(event)
               break
 
+      if user_content is None:
+        continue
+
       invocation_events = [
           InvocationEvent(author=e.author, content=e.content)
           for e in events_to_add