diff --git a/src/google/adk/flows/llm_flows/contents.py b/src/google/adk/flows/llm_flows/contents.py
index e5f58490..ae1bd44a 100644
--- a/src/google/adk/flows/llm_flows/contents.py
+++ b/src/google/adk/flows/llm_flows/contents.py
@@ -322,7 +322,8 @@ def _convert_foreign_event(event: Event) -> Event:
   content.role = 'user'
   content.parts = [types.Part(text='For context:')]
   for part in event.content.parts:
-    if part.text:
+    # Exclude thoughts from the context.
+    if part.text and not part.thought:
       content.parts.append(
           types.Part(text=f'[{event.author}] said: {part.text}')
       )