chore(1.0-dev): release 1.0.0-alpha.3 (#986)

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


##
[1.0.0-alpha.3](v1.0.0-alpha.2...v1.0.0-alpha.3)
(2026-04-17)


### Bug Fixes

* update `with_a2a_extensions` to append instead of overwriting
([#985](#985))
([e1d0e7a](e1d0e7a))

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

chore(1.0-dev): release 1.0.0-alpha.2 (#971)

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


##
[1.0.0-alpha.2](v1.0.0-alpha.1...v1.0.0-alpha.2)
(2026-04-17)


### ⚠ BREAKING CHANGES

* clean helpers and utils folders structure
([#983](#983))
* Raise errors on invalid AgentExecutor behavior.
([#979](#979))
* extract developer helpers in helpers folder
([#978](#978))

### Features

* Raise errors on invalid AgentExecutor behavior.
([#979](#979))
([f4a0bcd](f4a0bcd))
* **utils:** add `display_agent_card()` utility for human-readable
AgentCard inspection
([#972](#972))
([3468180](3468180))


### Bug Fixes

* Don't generate empty metadata change events in VertexTaskStore
([#974](#974))
([b58b03e](b58b03e)),
closes [#802](#802)
* **extensions:** support both header names and remove "activation"
concept ([#984](#984))
([b8df210](b8df210))


### Documentation

* AgentExecutor interface documentation
([#976](#976))
([d667e4f](d667e4f))
* move `ai_learnings.md` to local-only and update `GEMINI.md`
([#982](#982))
([f6610fa](f6610fa))


### Code Refactoring

* clean helpers and utils folders structure
([#983](#983))
([c87e87c](c87e87c))
* extract developer helpers in helpers folder
([#978](#978))
([5f3ea29](5f3ea29))

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

chore(1.0-dev): release 1.0.0-alpha.1 (#861)

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


##
[1.0.0-alpha.1](v1.0.0-alpha.0...v1.0.0-alpha.1)
(2026-04-10)


### ⚠ BREAKING CHANGES

* **client:** make ClientConfig.push_notification_config singular
([#955](#955))
* **client:** reorganize ClientFactory API
([#947](#947))
* **server:** add build_user function to DefaultContextBuilder to allow
A2A user creation customization
([#925](#925))
* **client:** remove `ClientTaskManager` and `Consumers` from client
([#916](#916))
* **server:** migrate from Application wrappers to Starlette route-based
endpoints for rest
([#892](#892))
* **server:** migrate from Application wrappers to Starlette route-based
endpoints for jsonrpc
([#873](#873))

### Features

* A2A Version Header validation on server side.
([#865](#865))
([b261ceb](b261ceb))
* Add GetExtendedAgentCard Support to RequestHandlers
([#919](#919))
([2159140](2159140))
* Add support for more Task Message and Artifact fields in the Vertex
Task Store ([#936](#936))
([605fa49](605fa49))
* Create EventQueue interface and make tap() async.
([#914](#914))
([9ccf99c](9ccf99c)),
closes [#869](#869)
* EventQueue - unify implementation between python versions
([#877](#877))
([7437b88](7437b88)),
closes [#869](#869)
* EventQueue is now a simple interface with single enqueue_event method.
([#944](#944))
([f0e1d74](f0e1d74))
* Implementation of DefaultRequestHandlerV2
([#933](#933))
([462eb3c](462eb3c)),
closes [#869](#869)
* InMemoryTaskStore creates a copy of Task by default to make it
consistent with database task stores
([#887](#887))
([8c65e84](8c65e84)),
closes [#869](#869)
* merge metadata of new and old artifact when append=True
([#945](#945))
([cc094aa](cc094aa))
* **server:** add async context manager support to EventQueue
([#743](#743))
([f68b22f](f68b22f))
* **server:** validate presence according to `google.api.field_behavior`
annotations
([#870](#870))
([4586c3e](4586c3e))
* Simplify ActiveTask.subscribe()
([#958](#958))
([62e5e59](62e5e59))
* Support AgentExectuor enqueue of a Task object.
([#960](#960))
([12ce017](12ce017))
* Support Message-only simplified execution without creating Task
([#956](#956))
([354fdfb](354fdfb))
* Unhandled exception in AgentExecutor marks task as failed
([#943](#943))
([4fc6b54](4fc6b54))


### Bug Fixes

* Add `packaging` to base dependencies
([#897](#897))
([7a9aec7](7a9aec7))
* **client:** do not mutate SendMessageRequest in
BaseClient.send_message
([#949](#949))
([94537c3](94537c3))
* fix `athrow()` RuntimeError on streaming responses
([#912](#912))
([ca7edc3](ca7edc3))
* fix docstrings related to `CallContextBuilder` args in constructors
and make ServerCallContext mandatory in `compat` folder
([#907](#907))
([9cade9b](9cade9b))
* fix error handling for gRPC and SSE streaming
([#879](#879))
([2b323d0](2b323d0))
* fix JSONRPC error handling
([#957](#957))
([6c807d5](6c807d5))
* fix REST error handling
([#893](#893))
([405be3f](405be3f))
* handle SSE errors occurred after stream started
([#894](#894))
([3a68d8f](3a68d8f))
* remove the use of deprecated types from VertexTaskStore
([#889](#889))
([6d49122](6d49122))
* Remove unconditional SQLAlchemy dependency from SDK core
([#898](#898))
([ab762f0](ab762f0)),
closes [#883](#883)
* remove unused import and request for FastAPI in pyproject
([#934](#934))
([fe5de77](fe5de77))
* replace stale entry in a2a.types.__all__ with actual import name
([#902](#902))
([05cd5e9](05cd5e9))
* wrong method name for ExtendedAgentCard endpoint in JsonRpc compat
version ([#931](#931))
([5d22186](5d22186))


### Documentation

* add Database Migration Documentation
([#864](#864))
([fd12dff](fd12dff))


### Miscellaneous Chores

* release 1.0.0-alpha.1
([a61f6d4](a61f6d4))


### Code Refactoring

* **client:** make ClientConfig.push_notification_config singular
([#955](#955))
([be4c5ff](be4c5ff))
* **client:** remove `ClientTaskManager` and `Consumers` from client
([#916](#916))
([97058bb](97058bb)),
closes [#734](#734)
* **client:** reorganize ClientFactory API
([#947](#947))
([01b3b2c](01b3b2c))
* **server:** add build_user function to DefaultContextBuilder to allow
A2A user creation customization
([#925](#925))
([2648c5e](2648c5e))
* **server:** migrate from Application wrappers to Starlette route-based
endpoints for jsonrpc
([#873](#873))
([734d062](734d062))
* **server:** migrate from Application wrappers to Starlette route-based
endpoints for rest
([#892](#892))
([4be2064](4be2064))

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

chore(main): release 0.3.26 (#935)

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


##
[0.3.26](v0.3.25...v0.3.26)
(2026-04-09)


### Features

* Add support for more Task Message and Artifact fields in the Vertex
Task Store ([#908](#908))
([5e0dcd7](5e0dcd7))


### Bug Fixes

* remove the use of deprecated types from VertexTaskStore
([#889](#889))
([6d49122](6d49122))

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

chore(1.0-dev): release 1.0.0-alpha.0 (#828)

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


### ⚠ BREAKING CHANGES

* **spec**: upgrade SDK to A2A 1.0 spec and use proto-based types
([#572](#572),
[#665](#665),
[#804](#804),
[#765](#765))
* **client:** introduce ServiceParameters for extensions and include it
in ClientCallContext
([#784](#784))
* **client:** rename "callback" -> "push_notification_config"
([#749](#749))
* **client:** transport agnostic interceptors
([#796](#796))
([a910cbc](a910cbc))
* add `protocol_version` column to Task and PushNotificationConfig
models and create a migration
([#789](#789))
([2e2d431](2e2d431))
* **server:** implement `Resource Scoping` for tasks and push
notifications
([#709](#709))
([f0d4669](f0d4669))

### Features

* add GetExtendedAgentCardRequest as input parameter to
GetExtendedAgentCard method
([#767](#767))
([13a092f](13a092f))
* add validation for the JSON-RPC version
([#808](#808))
([6eb7e41](6eb7e41))
* **client:** expose close() and async context manager support on
abstract Client
([#719](#719))
([e25ba7b](e25ba7b))
* **compat:** AgentCard backward compatibility helpers and tests
([#760](#760))
([81f3494](81f3494))
* **compat:** GRPC client compatible with 0.3 server
([#779](#779))
([0ebca93](0ebca93))
* **compat:** GRPC server compatible with 0.3 client
([#772](#772))
([80d827a](80d827a))
* **compat:** legacy v0.3 protocol models, conversion logic and
utilities ([#754](#754))
([26835ad](26835ad))
* **compat:** REST and JSONRPC clients compatible with 0.3 servers
([#798](#798))
([08794f7](08794f7))
* **compat:** REST and JSONRPC servers compatible with 0.3 clients
([#795](#795))
([9856054](9856054))
* **compat:** set a2a-version header to 1.0.0
([#764](#764))
([4cb68aa](4cb68aa))
* **compat:** unify v0.3 REST url prefix and expand cross-version tests
([#820](#820))
([0925f0a](0925f0a))
* database forward compatibility: make `owner` field optional
([#812](#812))
([cc29d1f](cc29d1f))
* handle tenant in Client
([#758](#758))
([5b354e4](5b354e4))
* implement missing push notifications related methods
([#711](#711))
([041f0f5](041f0f5))
* implement rich gRPC error details per A2A v1.0 spec
([#790](#790))
([245eca3](245eca3))
* **rest:** add tenant support to rest
([#773](#773))
([4771b5a](4771b5a))
* send task as a first subscribe event
([#716](#716))
([e71ac62](e71ac62))
* **server, grpc:** Implement tenant context propagation for gRPC
requests. ([#781](#781))
([164f919](164f919))
* **server, json-rpc:** Implement tenant context propagation for
JSON-RPC requests.
([#778](#778))
([72a330d](72a330d))
* **server:** add v0.3 legacy compatibility for database models
([#783](#783))
([08c491e](08c491e))
* **spec:** add `tasks/list` method with filtering and pagination to the
specification
([#511](#511))
([d5818e5](d5818e5))
* use StreamResponse as push notifications payload
([#724](#724))
([a149a09](a149a09))
* **rest:** update REST error handling to use `google.rpc.Status`
([#838](#838))
([ea7d3ad](ea7d3ad))


### Bug Fixes

* add history length and page size validations
([#726](#726))
([e67934b](e67934b))
* allign error codes with the latest spec
([#826](#826))
([709b1ff](709b1ff))
* **client:** align send_message signature with BaseClient
([#740](#740))
([57cb529](57cb529))
* get_agent_card trailing slash when agent_card_path=""
([#799](#799))
([#800](#800))
([a55c97e](a55c97e))
* handle parsing error in REST
([#806](#806))
([bbd09f2](bbd09f2))
* Improve error handling for Timeout exceptions on REST and JSON-RPC
clients ([#690](#690))
([2acd838](2acd838))
* Improve streaming errors handling
([#576](#576))
([7ea7475](7ea7475))
* properly handle unset and zero history length
([#717](#717))
([72a1007](72a1007))
* return entire history when history_length=0
([#537](#537))
([acdc0de](acdc0de))
* return mandatory fields from list_tasks
([#710](#710))
([6132053](6132053))
* taskslist error on invalid page token and response serialization
([#814](#814))
([a102d31](a102d31))
* use correct REST path for Get Extended Agent Card operation
([#769](#769))
([ced3f99](ced3f99))
* Use POST method for REST endpoint /tasks/{id}:subscribe
([#843](#843))
([a0827d0](a0827d0))

---
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: Ivan Shymko <ishymko@google.com>

chore(main): release 0.3.25 (#730)

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


##
[0.3.25](v0.3.24...v0.3.25)
(2026-03-10)


### Features

* Implement a vertex based task store
([#752](#752))
([fa14dbf](fa14dbf))


### Bug Fixes

* return background task from consume_and_break_on_interrupt to prevent
GC ([#775](#775))
([a236d4d](a236d4d))
* use default_factory for mutable field defaults in ServerCallContext
([#744](#744))
([22b25d6](22b25d6))

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

chore(main): release 0.3.24 (#708)

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


##
[0.3.24](v0.3.23...v0.3.24)
(2026-02-20)


### Bug Fixes

* **core:** preserve legitimate falsy values in _clean_empty
([#713](#713))
([7632f55](7632f55))
* **deps:** `DeprecationWarning` on `HTTP_413_REQUEST_ENTITY_TOO_LARGE`
([#693](#693))
([9968f9c](9968f9c))

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

chore(main): release 0.3.23 (#641)

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


##
[0.3.23](v0.3.22...v0.3.23)
(2026-02-13)


### Features

* add async context manager support to BaseClient
([#688](#688))
([ae9dc88](ae9dc88))
* add async context manager support to ClientTransport
([#682](#682))
([2e45c0d](2e45c0d))
* support async card modifiers
([#654](#654))
([a802500](a802500))
* support disabling OTel instrumentation via env var
([#611](#611))
([72216b9](72216b9))


### Bug Fixes

* do not crash on SSE comment line
([#636](#636))
([3dcb847](3dcb847))
* gRPC metadata header casing and invocation_metadata() call
([#676](#676))
([390b763](390b763))
* Improve error handling for Timeout exceptions on REST and JSON-RPC
clients ([#690](#690))
([2acd838](2acd838))
* map rejected task state in proto converters
([#668](#668))
([957e92b](957e92b)),
closes [#625](#625)
* **server:** fix deadlocks on agent execution failure in non-streaming
([#614](#614))
([d3c973f](d3c973f))


### Documentation

* explicitly mention supported spec version and transports in readme
([#681](#681))
([c91d4fb](c91d4fb)),
closes [#677](#677)
* Update README to include Code Wiki badge
([2698cc0](2698cc0))

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

chore(main): release 0.3.22 (#599)

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


##
[0.3.22](v0.3.21...v0.3.22)
(2025-12-16)


### Features

* Add custom ID generators to `SimpleRequestContextBuilder`
([#594](#594))
([04bcafc](04bcafc))


### Code Refactoring

* Move agent card signature verification into `A2ACardResolver`
([6fa6a6c](6fa6a6c))

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

chore(main): release 0.3.21 (#587)

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


##
[0.3.21](v0.3.20...v0.3.21)
(2025-12-12)


### Documentation

* Fixing typos
([#586](#586))
([5fea21f](5fea21f))

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