fix(spec): Clarify `contextId` behavior when message is sent with `taskId` but without `contextId` by herczyn · Pull Request #1309 · a2aproject/A2A

herczyn · 2025-12-12T09:46:54Z

gemini-code-assist · 2025-12-12T09:47:12Z

Summary of Changes

Hello @herczyn, 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 clearer guidelines on how contextId should be handled, particularly in scenarios where messages include a taskId but omit an explicit contextId. The updates ensure consistent behavior across agents by specifying rules for contextId inference, validation, and the acceptance of client-provided context identifiers, thereby improving the robustness and predictability of multi-turn interactions. These changes address the ambiguity identified in issue #1249.

Highlights

Context ID Origin Clarification: The specification has been updated to clarify that contextId is not exclusively server-generated, allowing for client-provided values.
Client-Provided Context ID Handling: Agents are now explicitly required to accept and preserve client-provided contextId values more broadly, removing the previous limitation to 'subsequent messages within the same conversation'.
Context ID Inference for Agents: New rules mandate that agents MUST infer the contextId from a taskId if a message provides only a taskId.
Context ID Mismatch Validation: Agents are now required to MUST reject messages where a provided contextId does not match the contextId associated with the given taskId.
Updated Message Proto Definition: The gRPC Message proto comment has been significantly rewritten to detail the precise rules for context_id and task_id usage for both server and client messages, incorporating the new inference and validation logic.

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Code Review

This pull request clarifies the behavior of contextId when a message is sent with a taskId but without a contextId. The changes update the specification document and the gRPC proto file to reflect that agents must infer the contextId from the task in this scenario, and must reject messages with mismatching contextId and taskId. The changes are clear and improve the specification. I've added a couple of minor suggestions to improve the wording in the documentation for better clarity and grammatical correctness.

docs/specification.md

specification/grpc/a2a.proto

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

docs/specification.md

muscariello · 2025-12-16T12:42:23Z

/vote

git-vote · 2025-12-16T12:42:26Z

Vote created

@muscariello has called for a vote on fix(spec): Clarify contextId behavior when message is sent with taskId but without contextId (#1309).

The members of the following teams have binding votes:

Team
@a2aproject/a2a-tsc

Non-binding votes are also appreciated as a sign of support!

How to vote

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The vote will be open for 11months 29days 3h 50m 24s. It will pass if at least 51% of the users with binding votes vote In favor 👍. Once it's closed, results will be published here as a new comment.

geneknit · 2025-12-16T17:14:13Z

@darrelmiller recommends a conversation as to whether contextId should be client provided.

muscariello · 2025-12-16T21:25:35Z

As @herczyn has updated the PR based on the TSC meeting this PR should be merged and a new issue opened for future discussion about if contextId should be client provided.

herczyn · 2025-12-16T21:32:22Z

As @herczyn has updated the PR based on the TSC meeting this PR should be merged and a new issue opened for future discussion about if contextId should be client provided.

new issue created and PR proposed: #1317

git-vote · 2025-12-17T12:59:33Z

Vote status

So far 12.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
1	0	0	7

Binding votes (1)

User	Vote	Timestamp
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@darrelmiller	Pending
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@ToddSegal	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2025-12-18T13:18:30Z

Vote status

So far 12.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
1	0	0	7

Binding votes (1)

User	Vote	Timestamp
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@darrelmiller	Pending
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@ToddSegal	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2025-12-25T14:49:51Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2025-12-26T15:10:33Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2025-12-27T15:19:51Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2025-12-28T15:40:34Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2025-12-29T15:49:52Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2025-12-30T16:10:34Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2025-12-31T16:19:52Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2026-01-01T16:40:35Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2026-01-02T16:49:53Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2026-01-03T17:10:35Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2026-01-04T17:19:53Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2026-01-05T17:40:35Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2026-01-06T17:49:53Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2026-01-07T18:10:36Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2026-01-08T18:19:54Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2026-01-09T18:40:36Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2026-01-10T18:49:54Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2026-01-11T19:10:37Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2026-01-12T19:19:55Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2026-01-13T19:40:37Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@lerhaupt	Pending
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2026-01-14T19:49:55Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending
@spetschulatSFDC	Pending

Non-binding votes (1)

User	Vote	Timestamp
Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2026-01-15T20:10:37Z

Vote status

So far 37.50% of the users with binding vote are in favor and 0.00% are against (passing threshold: 51%).

Summary

In favor	Against	Abstain	Not voted
3	0	0	5

Binding votes (3)

User	Vote	Timestamp
ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@geneknit	Pending
@hughesthe1st	Pending
@000-000-000-000-000	Pending
@SivaNSAP	Pending
@spetschulatSFDC	Pending

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Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

git-vote · 2026-01-16T19:13:04Z

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Binding votes (5)

User	Vote	Timestamp
@ToddSegal	In favor	2025-12-19 19:26:40.0 +00:00:00
@darrelmiller	In favor	2025-12-24 16:33:40.0 +00:00:00
@geneknit	In favor	2026-01-16 19:00:49.0 +00:00:00
@muscariello	In favor	2025-12-16 12:43:01.0 +00:00:00
@spetschulatSFDC	In favor	2026-01-15 23:52:49.0 +00:00:00

Non-binding votes (1)

User	Vote	Timestamp
@Tehsmash	In favor	2025-12-16 17:09:37.0 +00:00:00

🤖 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>

herczyn requested a review from a team as a code owner December 12, 2025 09:46

Specify context_id/task_id requirements.

739c22e

herczyn force-pushed the context_id_task_id_mismatch branch from 3d29b19 to 739c22e Compare December 12, 2025 09:47

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herczyn and others added 2 commits December 12, 2025 10:55

Update docs/specification.md

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

Update specification/grpc/a2a.proto

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

herczyn enabled auto-merge (squash) December 12, 2025 09:56

Wording fix.

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lkawka approved these changes Dec 12, 2025

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Small fix.

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Tehsmash approved these changes Dec 15, 2025

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herczyn added the TSC Review To be reviewed by the Technical Steering Committee label Dec 15, 2025

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Merge branch 'main' into context_id_task_id_mismatch

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herczyn disabled auto-merge December 16, 2025 17:18

Readd context id being server generated.

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herczyn enabled auto-merge (squash) December 16, 2025 17:44

holtskinner changed the title ~~fix(spec): Clarify contextId behavior when message is sent with taskId but without contextId~~ fix(spec): Clarify contextId behavior when message is sent with taskId but without contextId Dec 16, 2025

github-project-automation bot moved this from In Voting to Done in TSC Review Dec 24, 2025

a2a-bot mentioned this pull request Dec 18, 2025

chore(main): release 1.0.0 #1221

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herczyn deleted the context_id_task_id_mismatch branch February 3, 2026 10:23

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