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fix: null-pointer when message send configuration is provided with no history limit #536

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fix: null-pointer when message send configuration is provided with no history limit #536

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f89c339
fix null pointer
yarolegovich Nov 7, 2025
d5d1332
reformat
yarolegovich Nov 7, 2025
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5 changes: 4 additions & 1 deletion src/a2a/server/request_handlers/default_request_handler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -346,7 +346,10 @@ async def push_notification_callback() -> None:

if isinstance(result, Task):
self._validate_task_id_match(task_id, result.id)
if params.configuration:
if (
params.configuration
and params.configuration.history_length is not None
):
result = apply_history_length(
result, params.configuration.history_length
)
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39 changes: 39 additions & 0 deletions tests/server/request_handlers/test_default_request_handler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -875,6 +875,45 @@ async def test_on_message_send_limit_history():
assert task.history is not None and len(task.history) > 0


@pytest.mark.asyncio
async def test_on_message_send_limit_history_non_as_no_limit():
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@gemini-code-assist gemini-code-assist bot Nov 7, 2025

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low

This is a great test case to ensure that a None value for history_length doesn't truncate the history. For better readability, consider renaming the test to be more descriptive of its purpose. For example: test_on_message_send_with_none_history_length_is_not_limited.

Suggested change
async def test_on_message_send_limit_history_non_as_no_limit():
async def test_on_message_send_with_none_history_length_is_not_limited():

task_store = InMemoryTaskStore()
push_store = InMemoryPushNotificationConfigStore()

request_handler = DefaultRequestHandler(
agent_executor=HelloAgentExecutor(),
task_store=task_store,
push_config_store=push_store,
)
params = MessageSendParams(
message=Message(
role=Role.user,
message_id='msg_push',
parts=[Part(root=TextPart(text='Hi'))],
),
configuration=MessageSendConfiguration(
blocking=True,
accepted_output_modes=['text/plain'],
history_length=None,
),
)

result = await request_handler.on_message_send(
params, create_server_call_context()
)

# verify that history_length is honored
assert result is not None
assert isinstance(result, Task)
assert result.history is not None and len(result.history) > 0
assert result.status.state == TaskState.completed

# verify that history is still persisted to the store
task = await task_store.get(result.id)
assert task is not None
assert task.history is not None and len(task.history) > 0


@pytest.mark.asyncio
async def test_on_task_get_limit_history():
task_store = InMemoryTaskStore()
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