v1.0.0-alpha.1

1.0.0-alpha.1 (2026-04-10)

⚠ BREAKING CHANGES

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

Features

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

Bug Fixes

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

Documentation

• add Database Migration Documentation (#864) (fd12dff)

Miscellaneous Chores

• release 1.0.0-alpha.1 (a61f6d4)

Code Refactoring

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

v0.3.26

0.3.26 (2026-04-09)

Features

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

Bug Fixes

• remove the use of deprecated types from VertexTaskStore (#889) (6d49122)

v1.0.0-alpha.0

1.0.0-alpha.0 (2026-03-17)

⚠ BREAKING CHANGES

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

Features

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

Bug Fixes

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

v0.3.25

0.3.25 (2026-03-10)

Features

• Implement a vertex based task store (#752) (fa14dbf)

Bug Fixes

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

v0.3.24

0.3.24 (2026-02-20)

Bug Fixes

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

v0.3.23

0.3.23 (2026-02-13)

Features

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

Bug Fixes

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

Documentation

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

v0.3.22

0.3.22 (2025-12-16)

Features

• Add custom ID generators to SimpleRequestContextBuilder (#594) (04bcafc)

Code Refactoring

• Move agent card signature verification into A2ACardResolver (6fa6a6c)

v0.3.21

0.3.21 (2025-12-12)

Documentation

• Fixing typos (#586) (5fea21f)

v0.3.20

0.3.20 (2025-12-03)

Bug Fixes

• Improve streaming errors handling (#576) (7ea7475)

v0.3.19

0.3.19 (2025-11-25)

Bug Fixes

• jsonrpc, rest: extensions support in get_card methods in json-rpc and rest transports (#564) (847f18e)