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Fails to save agent state: _SignInState is not JSON serializable #262
Description
Using Authorization and BlobStorage at the same time results in serialization errors. The _SignInState includes a Pydantic model of Activity which cannot be serialized with json.dumps.
Issue is with this line offering an Activity to be serialized by storage implementations:
I initialized the AgentApplication like in the auto-signin sample, except storage is a BlobStorage.
STORAGE = BlobStorage(
BlobStorageConfig(...)
)
CONNECTION_MANAGER = MsalConnectionManager(**agents_sdk_config)
ADAPTER = CloudAdapter(connection_manager=CONNECTION_MANAGER)
AUTHORIZATION = Authorization(
storage=STORAGE, connection_manager=CONNECTION_MANAGER, **agents_sdk_config
)
AGENT_APP = AgentApplication[TurnState](
storage=STORAGE, adapter=ADAPTER, authorization=AUTHORIZATION, **agents_sdk_config
)
@AGENT_APP.activity(ActivityTypes.message, auth_handlers=["GRAPH"])
async def on_message(context: TurnContext, state: TurnState) -> None:
...Stack trace when a message activity is received.
Traceback (most recent call last):
File ".venv/lib/python3.13/site-packages/microsoft_agents/hosting/core/channel_adapter.py", line 242, in run_pipeline
return await self.middleware_set.receive_activity_with_status(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
context, callback
^^^^^^^^^^^^^^^^^
)
^
File ".venv/lib/python3.13/site-packages/microsoft_agents/hosting/core/middleware_set.py", line 56, in receive_activity_with_status
return await self.receive_activity_internal(context, callback)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File ".venv/lib/python3.13/site-packages/microsoft_agents/hosting/core/middleware_set.py", line 66, in receive_activity_internal
return await callback(context)
^^^^^^^^^^^^^^^^^^^^^^^
File ".venv/lib/python3.13/site-packages/microsoft_agents/hosting/core/app/agent_application.py", line 679, in on_turn
await self._start_long_running_call(context, self._on_turn)
File ".venv/lib/python3.13/site-packages/microsoft_agents/hosting/core/app/agent_application.py", line 865, in _start_long_running_call
return await func(context)
^^^^^^^^^^^^^^^^^^^
File ".venv/lib/python3.13/site-packages/microsoft_agents/hosting/core/app/agent_application.py", line 701, in _on_turn
) = await self._auth._on_turn_auth_intercept(context, turn_state)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File ".venv/lib/python3.13/site-packages/microsoft_agents/hosting/core/app/oauth/authorization.py", line 302, in _on_turn_auth_intercept
sign_in_response = await self._start_or_continue_sign_in(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
context, state, auth_handler_id
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
)
^
File ".venv/lib/python3.13/site-packages/microsoft_agents/hosting/core/app/oauth/authorization.py", line 259, in _start_or_continue_sign_in
await self._save_sign_in_state(context, sign_in_state)
File ".venv/lib/python3.13/site-packages/microsoft_agents/hosting/core/app/oauth/authorization.py", line 157, in _save_sign_in_state
await self._storage.write({key: state})
File ".venv/lib/python3.13/site-packages/microsoft_agents/hosting/core/storage/storage.py", line 91, in write
await gather(*[self._write_item(key, value) for key, value in changes.items()])
File ".venv/lib/python3.13/site-packages/microsoft_agents/storage/blob/blob_storage.py", line 90, in _write_item
item_rep_bytes = json.dumps(item_JSON).encode("utf-8")
~~~~~~~~~~^^^^^^^^^^^
File "~/.local/share/uv/python/cpython-3.13.7-linux-x86_64-gnu/lib/python3.13/json/__init__.py", line 231, in dumps
return _default_encoder.encode(obj)
~~~~~~~~~~~~~~~~~~~~~~~^^^^^
File "~/.local/share/uv/python/cpython-3.13.7-linux-x86_64-gnu/lib/python3.13/json/encoder.py", line 200, in encode
chunks = self.iterencode(o, _one_shot=True)
File "~/.local/share/uv/python/cpython-3.13.7-linux-x86_64-gnu/lib/python3.13/json/encoder.py", line 261, in iterencode
return _iterencode(o, 0)
File "~/.local/share/uv/python/cpython-3.13.7-linux-x86_64-gnu/lib/python3.13/json/encoder.py", line 180, in default
raise TypeError(f'Object of type {o.__class__.__name__} '
f'is not JSON serializable')
TypeError: Object of type Activity is not JSON serializable
"microsoft-agents-authentication-msal>=0.6.0",
"microsoft-agents-hosting-aiohttp>=0.6.0",
"microsoft-agents-hosting-teams>=0.6.0",
"microsoft-agents-storage-blob>=0.6.0",
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rodrigobr-msft commentedon Dec 1, 2025
Please try version 0.6.1 that includes a fix for this. Thank you for your time!