From f64190446c154fe4aa82743db639793608bc4186 Mon Sep 17 00:00:00 2001
From: perseus <51974392+tcconnally@users.noreply.github.com>
Date: Mon, 15 Jun 2026 15:21:36 -0500
Subject: [PATCH 1/2] fix: skip eval invocations without user content to
 prevent ValidationError

When a session contains invocations without user-authored events,
convert_events_to_eval_invocations() created an Invocation with an
empty Content(parts=[]). This caused a Pydantic ValidationError because
Invocation.user_content is typed as genai_types.Content (non-optional)
and an empty Content with no parts triggered validation failure.

Fix: skip invocations entirely when no user event is found in the
event list, since evaluations without user input are not meaningful.

Closes #3760
---
 src/google/adk/evaluation/evaluation_generator.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/google/adk/evaluation/evaluation_generator.py b/src/google/adk/evaluation/evaluation_generator.py
index e0e61fe758..7264c9dad6 100644
--- a/src/google/adk/evaluation/evaluation_generator.py
+++ b/src/google/adk/evaluation/evaluation_generator.py
@@ -672,6 +672,12 @@ def convert_events_to_eval_invocations(
               events_to_add.append(event)
               break
 
+      # Skip invocations without user content — evaluations without
+      # user input are not meaningful and would cause a Pydantic
+      # ValidationError on Invocation.user_content.
+      if not user_content.parts:
+        continue
+
       invocation_events = [
           InvocationEvent(author=e.author, content=e.content)
           for e in events_to_add

From 9352f628df47473ce6bb9c008140e645900fe022 Mon Sep 17 00:00:00 2001
From: perseus <51974392+tcconnally@users.noreply.github.com>
Date: Wed, 17 Jun 2026 18:39:59 +0000
Subject: [PATCH 2/2] fix: add None guard for user_content in eval event
 processing

---
 src/google/adk/evaluation/evaluation_generator.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/google/adk/evaluation/evaluation_generator.py b/src/google/adk/evaluation/evaluation_generator.py
index 7264c9dad6..c1e3227a29 100644
--- a/src/google/adk/evaluation/evaluation_generator.py
+++ b/src/google/adk/evaluation/evaluation_generator.py
@@ -675,7 +675,7 @@ def convert_events_to_eval_invocations(
       # Skip invocations without user content — evaluations without
       # user input are not meaningful and would cause a Pydantic
       # ValidationError on Invocation.user_content.
-      if not user_content.parts:
+      if not (user_content and user_content.parts):
         continue
 
       invocation_events = [