# Description
Introduces support for Database backed Push Notification Config Store.

Push Notification Config persisted to the database table gets encrypted
when encryption_key param is set for the
DatabasePushNotificationConfigStore.

Usage:

```py
httpx_client = httpx.AsyncClient()
 engine = create_async_engine(
            "sqlite+aiosqlite:///file::memory:?cache=shared",
            echo=False
        )

push_config_store = DatabasePushNotificationConfigStore(engine=engine,
                    encryption_key=Fernet.generate_key()) 
push_sender = BasePushNotificationSender(
    httpx_client=httpx_client,
    config_store=push_config_store)

 request_handler = DefaultRequestHandler(
            agent_executor=CurrencyAgentExecutor(),
            task_store=DatabaseTaskStore(engine=engine),
            push_config_store=push_config_store,
            push_sender=push_sender)
```

Fixes #249

This update addresses an issue where the `completed_task` function in
`a2a/utils/task.py` did not perform any validation on the `artifacts`
list. This could lead to unexpected behavior if an empty or invalid list
was provided.

This change introduces a validation check to ensure that the `artifacts`
list is a non-empty list of `Artifact` objects, raising a `ValueError`
if the validation fails.

**Changes:**

- Modified `a2a/utils/task.py` to add a validation check for the
`artifacts` parameter in the `completed_task` function.
- Updated `tests/utils/test_task.py` to include tests for the new
validation logic, covering cases with empty lists and lists containing
invalid items.

Previously, the `TaskManager` class in
`a2a/server/tasks/task_manager.py` did not perform any validation on the
`task_id` during initialization. This could lead to silent failures or
inconsistencies in task storage if an invalid ID (such as an empty
string) was provided.

### Impact

Adding this validation improves the robustness of the `TaskManager` and
prevents downstream errors in task management, especially for database
or in-memory stores.

### Fix

In `a2a/server/tasks/task_manager.py`, a check has been added to the
`__init__` method of the `TaskManager` to validate the `task_id`. It now
ensures that if a `task_id` is provided, it is a non-empty string. If
the validation fails, a `ValueError` is raised.

A corresponding unit test has been added to
`tests/server/tasks/test_task_manager.py` to verify that the validation
works as expected.

# Description

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Before submitting your PR, there are a few things you can do to make
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Fixes #<issue_number_goes_here> 🦕

)

Fixes #311 🦕

This PR updates `src/a2a/types.py` based on the latest
`specification/json/a2a.json` from
[a2aproject/A2A](a2aproject/A2A@6f1d17b).

---------

Co-authored-by: Holt Skinner <holtskinner@google.com>

🤖 I have created a release *beep* *boop*
---


##
[0.2.13](v0.2.12...v0.2.13)
(2025-07-17)


### Features

* Add `get_data_parts()` and `get_file_parts()` helper methods
([#312](#312))
([5b98c32](5b98c32))
* Support for Database based Push Config Store
([#299](#299))
([e5d99ee](e5d99ee))
* Update A2A types from specification 🤖
([#319](#319))
([18506a4](18506a4))


### Bug Fixes

* Add Input Validation for Task IDs in TaskManager
([#310](#310))
([a38d438](a38d438))
* Add validation for empty artifact lists in `completed_task`
([#308](#308))
([c4a324d](c4a324d))
* Handle readtimeout errors.
([#305](#305))
([b94b8f5](b94b8f5)),
closes [#249](#249)


### Documentation

* Update Documentation Site Link
([#315](#315))
([edf392c](edf392c))

---
This PR was generated with [Release
Please](https://github.com/googleapis/release-please). See
[documentation](https://github.com/googleapis/release-please#release-please).

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>