fix(spec): Clarify versioning strategy and client responsibilities in protocol specification by darrelmiller · Pull Request #1259 · a2aproject/A2A

darrelmiller · 2025-11-30T21:11:00Z

High level summary of changes:

protocolVersion in AgentCard is now an array called protocolVersions
Servers are expected to return UnsupportedVersionError if they get a request with an A2A-Version header higher than they support.
Clients are expected to fallback to a supported version if that is acceptable to them. Tooling should help here.
Not every minor version needs to be enumerated in the protocolVersions array. 2.2 infers support for 2.1 and 2.0.

… protocol specification

gemini-code-assist · 2025-11-30T21:11:12Z

Summary of Changes

Hello @darrelmiller, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the A2A protocol specification by providing a more detailed and structured explanation of its versioning strategy. It clearly delineates the responsibilities of clients and servers regarding protocol version negotiation, error handling, and introduces guidance for client fallback mechanisms and tooling support to enhance compatibility and robustness across different protocol versions.

Highlights

Versioning Strategy Clarification: The specification now explicitly clarifies that patch version numbers should not be used in requests, responses, or Agent Cards, and should not be considered during protocol version negotiation.
Structured Responsibilities: The versioning section has been reorganized into distinct sub-sections: Client Responsibilities, Server Responsibilities, Client Fallback, and Tooling Support, providing a clearer delineation of roles.
Client Guidance: Detailed recommendations for clients on sending the A2A-Version header and handling VersionNotSupportedError have been added, including options for retrying with earlier versions.
Server Requirements: Specific requirements for agents (servers) on processing requests with a supported A2A-Version and returning VersionNotSupportedError for unsupported versions are now defined.
Tooling Support Recommendations: New guidance for tooling libraries and SDKs is included, suggesting mechanisms to help clients manage protocol versioning, such as automatic fallback configuration.

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Code Review

This pull request significantly clarifies the A2A protocol's versioning strategy by restructuring the documentation and adding explicit responsibilities for clients and servers, as well as guidance on client fallback and tooling support. The changes are a great improvement to the specification. I've added a couple of minor suggestions to further improve the clarity of the wording in the new sections.

docs/specification.md

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

docs/specification.md

darrelmiller · 2025-12-01T19:23:04Z

/vote

git-vote · 2025-12-01T19:23:07Z

DEPRECATED
#1259 (comment) has the vote

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@darrelmiller has called for a vote on fix(spec): Clarify versioning strategy and client responsibilities in protocol specification (#1259).

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git-vote · 2025-12-02T19:27:58Z

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geneknit	In favor	2025-12-02 17:59:14.0 +00:00:00
muscariello	In favor	2025-12-02 7:40:23.0 +00:00:00
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docs/specification.md

git-vote · 2025-12-03T19:29:30Z

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geneknit	In favor	2025-12-02 17:59:14.0 +00:00:00
muscariello	In favor	2025-12-02 7:40:23.0 +00:00:00
@darrelmiller	Pending
@lerhaupt	Pending
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git-vote · 2025-12-04T19:57:58Z

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geneknit	In favor	2025-12-02 17:59:14.0 +00:00:00
muscariello	In favor	2025-12-02 7:40:23.0 +00:00:00
@darrelmiller	Pending
@lerhaupt	Pending
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docs/specification.md

git-vote · 2025-12-05T19:59:30Z

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geneknit	In favor	2025-12-02 17:59:14.0 +00:00:00
muscariello	In favor	2025-12-02 7:40:23.0 +00:00:00
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git-vote · 2025-12-06T20:27:58Z

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geneknit	In favor	2025-12-02 17:59:14.0 +00:00:00
muscariello	In favor	2025-12-02 7:40:23.0 +00:00:00
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git-vote · 2025-12-07T20:29:31Z

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geneknit	In favor	2025-12-02 17:59:14.0 +00:00:00
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git-vote · 2025-12-08T19:23:16Z

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User	Vote	Timestamp
@geneknit	In favor	2025-12-02 17:59:14.0 +00:00:00
@muscariello	In favor	2025-12-02 7:40:23.0 +00:00:00

amye · 2025-12-09T17:37:04Z

/vote

git-vote · 2025-12-09T17:37:07Z

Vote created

@amye has called for a vote on fix(spec): Clarify versioning strategy and client responsibilities in protocol specification (#1259).

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git-vote · 2025-12-31T22:49:52Z

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User	Vote	Timestamp
ToddSegal	In favor	2025-12-22 20:03:30.0 +00:00:00
darrelmiller	In favor	2025-12-24 22:22:43.0 +00:00:00
geneknit	In favor	2025-12-10 17:23:04.0 +00:00:00
muscariello	In favor	2025-12-11 9:41:23.0 +00:00:00
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git-vote · 2026-01-01T23:10:35Z

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User	Vote	Timestamp
ToddSegal	In favor	2025-12-22 20:03:30.0 +00:00:00
darrelmiller	In favor	2025-12-24 22:22:43.0 +00:00:00
geneknit	In favor	2025-12-10 17:23:04.0 +00:00:00
muscariello	In favor	2025-12-11 9:41:23.0 +00:00:00
@lerhaupt	Pending
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git-vote · 2026-01-02T23:19:53Z

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Binding votes (4)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-22 20:03:30.0 +00:00:00
darrelmiller	In favor	2025-12-24 22:22:43.0 +00:00:00
geneknit	In favor	2025-12-10 17:23:04.0 +00:00:00
muscariello	In favor	2025-12-11 9:41:23.0 +00:00:00
@lerhaupt	Pending
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git-vote · 2026-01-03T23:40:35Z

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User	Vote	Timestamp
ToddSegal	In favor	2025-12-22 20:03:30.0 +00:00:00
darrelmiller	In favor	2025-12-24 22:22:43.0 +00:00:00
geneknit	In favor	2025-12-10 17:23:04.0 +00:00:00
muscariello	In favor	2025-12-11 9:41:23.0 +00:00:00
@lerhaupt	Pending
@hughesthe1st	Pending
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git-vote · 2026-01-04T23:49:53Z

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User	Vote	Timestamp
ToddSegal	In favor	2025-12-22 20:03:30.0 +00:00:00
darrelmiller	In favor	2025-12-24 22:22:43.0 +00:00:00
geneknit	In favor	2025-12-10 17:23:04.0 +00:00:00
muscariello	In favor	2025-12-11 9:41:23.0 +00:00:00
@lerhaupt	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
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docs/specification.md

Co-authored-by: Sam Betts <1769706+Tehsmash@users.noreply.github.com>

git-vote · 2026-01-06T00:10:35Z

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User	Vote	Timestamp
ToddSegal	In favor	2025-12-22 20:03:30.0 +00:00:00
darrelmiller	In favor	2025-12-24 22:22:43.0 +00:00:00
geneknit	In favor	2025-12-10 17:23:04.0 +00:00:00
muscariello	In favor	2025-12-11 9:41:23.0 +00:00:00
@lerhaupt	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2026-01-05 13:18:59.0 +00:00:00

git-vote · 2026-01-07T00:19:53Z

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Binding votes (4)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-22 20:03:30.0 +00:00:00
darrelmiller	In favor	2025-12-24 22:22:43.0 +00:00:00
geneknit	In favor	2025-12-10 17:23:04.0 +00:00:00
muscariello	In favor	2025-12-11 9:41:23.0 +00:00:00
@lerhaupt	Pending
@hughesthe1st	Pending
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User	Vote	Timestamp
Tehsmash	In favor	2026-01-05 13:18:59.0 +00:00:00

git-vote · 2026-01-08T00:40:36Z

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User	Vote	Timestamp
ToddSegal	In favor	2025-12-22 20:03:30.0 +00:00:00
darrelmiller	In favor	2025-12-24 22:22:43.0 +00:00:00
geneknit	In favor	2025-12-10 17:23:04.0 +00:00:00
muscariello	In favor	2025-12-11 9:41:23.0 +00:00:00
@lerhaupt	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2026-01-05 13:18:59.0 +00:00:00

git-vote · 2026-01-09T00:49:54Z

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Binding votes (4)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-22 20:03:30.0 +00:00:00
darrelmiller	In favor	2025-12-24 22:22:43.0 +00:00:00
geneknit	In favor	2025-12-10 17:23:04.0 +00:00:00
muscariello	In favor	2025-12-11 9:41:23.0 +00:00:00
@lerhaupt	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2026-01-05 13:18:59.0 +00:00:00

git-vote · 2026-01-10T01:10:36Z

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Binding votes (4)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-22 20:03:30.0 +00:00:00
darrelmiller	In favor	2025-12-24 22:22:43.0 +00:00:00
geneknit	In favor	2025-12-10 17:23:04.0 +00:00:00
muscariello	In favor	2025-12-11 9:41:23.0 +00:00:00
@lerhaupt	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2026-01-05 13:18:59.0 +00:00:00

git-vote · 2026-01-11T01:19:54Z

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Binding votes (4)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-22 20:03:30.0 +00:00:00
darrelmiller	In favor	2025-12-24 22:22:43.0 +00:00:00
geneknit	In favor	2025-12-10 17:23:04.0 +00:00:00
muscariello	In favor	2025-12-11 9:41:23.0 +00:00:00
@lerhaupt	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2026-01-05 13:18:59.0 +00:00:00

git-vote · 2026-01-12T01:40:37Z

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Binding votes (4)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-22 20:03:30.0 +00:00:00
darrelmiller	In favor	2025-12-24 22:22:43.0 +00:00:00
geneknit	In favor	2025-12-10 17:23:04.0 +00:00:00
muscariello	In favor	2025-12-11 9:41:23.0 +00:00:00
@lerhaupt	Pending
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@000-000-000-000-000	Pending
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User	Vote	Timestamp
Tehsmash	In favor	2026-01-05 13:18:59.0 +00:00:00

git-vote · 2026-01-13T01:49:54Z

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User	Vote	Timestamp
ToddSegal	In favor	2025-12-22 20:03:30.0 +00:00:00
darrelmiller	In favor	2025-12-24 22:22:43.0 +00:00:00
geneknit	In favor	2025-12-10 17:23:04.0 +00:00:00
muscariello	In favor	2025-12-11 9:41:23.0 +00:00:00
@lerhaupt	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
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User	Vote	Timestamp
Tehsmash	In favor	2026-01-05 13:18:59.0 +00:00:00

git-vote · 2026-01-13T19:13:04Z

Vote closed

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Binding votes (5)

User	Vote	Timestamp
@SivaNSAP	In favor	2026-01-13 16:14:34.0 +00:00:00
@ToddSegal	In favor	2025-12-22 20:03:30.0 +00:00:00
@darrelmiller	In favor	2025-12-24 22:22:43.0 +00:00:00
@geneknit	In favor	2025-12-10 17:23:04.0 +00:00:00
@muscariello	In favor	2025-12-11 9:41:23.0 +00:00:00

Non-binding votes (1)

User	Vote	Timestamp
@Tehsmash	In favor	2026-01-05 13:18:59.0 +00:00:00

I addressed the issue raised.

🤖 I have created a release *beep* *boop* --- ## [1.0.0](v0.3.0...v1.0.0) (2026-03-12) ### ⚠ BREAKING CHANGES * **spec:** Combine `TaskPushNotificationConfig` and `PushNotificationConfig` ([#1500](#1500)) * **spec:** remove duplicated ID from the create task push config request ([#1487](#1487)) * **spec:** pluralize configs in `ListTaskPushNotificationConfigs` ([#1486](#1486)) * **spec:** Add LF prefix to the package. ([#1474](#1474)) * **spec:** Switch to non-complex IDs in requests ([#1389](#1389)) * **spec:** Standardize spelling of "canceled" to use American Spelling throughout ([#1283](#1283)) * **spec:** Align enum format with ADR-001 ProtoJSON specification ([#1384](#1384)) * **spec:** Remove redundant `final` field from `TaskStatusUpdateEvent` ([#1308](#1308)) * **spec:** Move `extendedAgentCard` field to `AgentCapabilities` ([#1307](#1307)) * **spec:** Fixes for the last_updated_after field ([#1358](#1358)) * **spec:** modernize oauth 2.0 flows - remove implicit/password, add device code / pkce ([#1303](#1303)) * **spec:** Make "message" field name consistent between protocol bindings ([#1302](#1302)) * **spec:** Remove deprecated fields from a2a.proto for v1.0 release ([#1301](#1301)) * **spec:** Rename `supportsAuthenticatedExtendedCard` to `supportsExtendedAgentCard` ([#1222](#1222)) * **spec:** Remove v1s from a2a url http bindings * **spec:** Large refactor of specification to separate application protocol definition from mapping to transports ### Features * **spec:** Add `tasks/list` method with filtering and pagination to the specification ([0a9f629](0a9f629)) * **spec:** modernize oauth 2.0 flows - remove implicit/password, add device code / pkce ([#1303](#1303)) ([525ff38](525ff38)) * **spec:** Natively Support Multi-tenancy on gRPC through an additional scope field on the request. ([#1195](#1195)) ([cfbce32](cfbce32)), closes [#1148](#1148) * **spec:** Provide ability for SDKs to be backwards compatible. ([#1401](#1401)) ([227e249](227e249)) * **spec:** Remove v1s from a2a url http bindings ([1bd263f](1bd263f)) ### Bug Fixes * Add missing metadata field to Part message in gRPC specification ([#1019](#1019)) ([b3b266d](b3b266d)), closes [#1005](#1005) * Add name field to FilePart protobuf message ([#983](#983)) ([2b7cb6f](2b7cb6f)), closes [#984](#984) * Clarify blocking calls return on interrupted states ([#1403](#1403)) ([0655ff3](0655ff3)) * **doc:** Makes JSON-RPC SendMessage response clearer ([#1241](#1241)) ([5792804](5792804)) * **docs:** Clearer wording around context id. ([#1588](#1588)) ([dec790a](dec790a)) * **grpc:** Fix inconsistent property name between gRPC and JSON-RPC in Message object ([#1100](#1100)) ([2a1f819](2a1f819)) * **grpc:** missing field in gRPC spec - state_transition_history ([#1138](#1138)) ([a2de798](a2de798)), closes [#1139](#1139) * **grpc:** Update `CreateTaskPushNotificationConfig` endpoint to `/v1/{parent=tasks/*/pushNotificationConfigs}` ([#979](#979)) ([911f9b0](911f9b0)) * **proto:** Add icon_url to a2a.proto ([#986](#986)) ([17e7f62](17e7f62)) * **proto:** Adds metadata field to A2A DataPart proto ([#1004](#1004)) ([a8b45dc](a8b45dc)) * Remove unimplemented state_transition_history capability field ([#1396](#1396)) ([c768a44](c768a44)), closes [#1228](#1228) * Restore CreateTaskPushNotificationConfig method naming ([#1402](#1402)) ([d14f410](d14f410)) * Revert "chore(gRPC): Update a2a.proto to include metadata on GetTaskRequest" ([#1000](#1000)) ([e6b8c65](e6b8c65)) * Simplify Part message structure by flattening FilePart and DataPart ([#1411](#1411)) ([bfae8f7](bfae8f7)) * **spec:** Add LF prefix to the package. ([#1474](#1474)) ([a54e809](a54e809)) * **spec:** add metadata to `CancelTaskRequest` ([#1485](#1485)) ([c441b91](c441b91)), closes [#1484](#1484) * **spec:** Added clarification on timestamps in HTTP query params ([#1425](#1425)) ([6292104](6292104)) * **spec:** Added clarifying text around messages and artifacts ([#1424](#1424)) ([b03d141](b03d141)) * **spec:** Adjust field number for `ListTasksRequest.tenant` to prevent missing number ([#1470](#1470)) ([cd16c52](cd16c52)) * **spec:** Clarify contextId behavior when message is sent with taskId but without contextId ([#1309](#1309)) ([a336a5a](a336a5a)) * **spec:** Clarify versioning strategy and client responsibilities in protocol specification ([#1259](#1259)) ([a4afeea](a4afeea)) * **spec:** Fix/1251 clarify authentication scheme ([#1256](#1256)) ([3e6c7db](3e6c7db)) * **spec:** Fixes for the last_updated_after field ([#1358](#1358)) ([0e204bf](0e204bf)) * **spec:** Make "message" field name consistent between protocol bindings ([#1302](#1302)) ([1e5f462](1e5f462)), closes [#1230](#1230) * **spec:** make `history_length` optional ([#1071](#1071)) ([0572953](0572953)) * **spec:** pluralize configs in `ListTaskPushNotificationConfigs` ([#1486](#1486)) ([cf735cb](cf735cb)) * **spec:** Remove config from binding. ([#1587](#1587)) ([010b9cc](010b9cc)) * **spec:** Remove deprecated fields from a2a.proto for v1.0 release ([#1301](#1301)) ([60f83c3](60f83c3)), closes [#1227](#1227) * **spec:** remove duplicated ID from the create task push config request ([#1487](#1487)) ([393898d](393898d)) * **spec:** Remove metadata field from ListTasksRequest ([#1235](#1235)) ([b6ef9ee](b6ef9ee)) * **spec:** Remove reserved and fix tags ordering ([#1494](#1494)) ([1997c9d](1997c9d)) * **spec:** Rename `supportsAuthenticatedExtendedCard` to `supportsExtendedAgentCard` ([#1222](#1222)) ([c196824](c196824)), closes [#1215](#1215) * **spec:** Standardize spelling of "canceled" to use American Spelling throughout ([#1283](#1283)) ([4dd980f](4dd980f)) * **spec:** Suggest Unique Identifier fields to be UUID ([#966](#966)) ([00cf76e](00cf76e)) * **spec:** Switch to non-complex IDs in requests ([#1389](#1389)) ([2596c1c](2596c1c)), closes [#1390](#1390) * **spec:** Update security schemes example ([#1364](#1364)) ([f9a8f5b](f9a8f5b)) * Update the Java tutorials and descriptions ([#1181](#1181)) ([202aa06](202aa06)) ### Documentation * **spec:** Align enum format with ADR-001 ProtoJSON specification ([#1384](#1384)) ([810eaa1](810eaa1)), closes [#1344](#1344) ### Code Refactoring * **spec:** Combine `TaskPushNotificationConfig` and `PushNotificationConfig` ([#1500](#1500)) ([d1ed0da](d1ed0da)) * **spec:** Large refactor of specification to separate application protocol definition from mapping to transports ([b078419](b078419)) * **spec:** Move `extendedAgentCard` field to `AgentCapabilities` ([#1307](#1307)) ([40d6286](40d6286)) * **spec:** Remove redundant `final` field from `TaskStatusUpdateEvent` ([#1308](#1308)) ([5b101cc](5b101cc)) --- 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: Amye Scavarda Perrin <amye@amye.org> Co-authored-by: Holt Skinner <13262395+holtskinner@users.noreply.github.com>

fix(spec): Clarify versioning strategy and client responsibilities in…

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[Bug]: patch releases for the spec repo should only be for non-functional changes #1357

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[Bug]: Clarify client version fallback strategy #1258

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chore(main): release 1.0.0 #1221

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