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fix(spec): Remove metadata field from ListTasksRequest#1235

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herczyn merged 7 commits intoa2aproject:mainfrom
iliesicatrinel:spec-list-fix
Nov 29, 2025
Merged

fix(spec): Remove metadata field from ListTasksRequest#1235
herczyn merged 7 commits intoa2aproject:mainfrom
iliesicatrinel:spec-list-fix

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@iliesicatrinel
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@iliesicatrinel iliesicatrinel commented Nov 24, 2025

The ListTasksRequest message includes a google.protobuf.Struct metadata field, which cannot be represented as simple URL query parameter required by HTTP GET requests. This causes service config generation to fail with http: map field 'google.protobuf.Struct.fields' referred to by message 'a2a.v1.ListTasksRequest.

Since it's unclear whether metadata will be useful for ListTasks, I propose to remove it at least for now to fix the specification.

Fixes #1236 🦕

@iliesicatrinel iliesicatrinel requested a review from a team as a code owner November 24, 2025 09:28
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Summary of Changes

Hello @iliesicatrinel, 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 addresses a critical limitation in the ListTasks RPC method where its request message, containing a google.protobuf.Struct field, was incompatible with HTTP GET requests. The change reconfigures the method to utilize an HTTP POST request, enabling the full request payload to be transmitted as JSON in the request body. This ensures proper data handling and functionality for the ListTasks operation, allowing complex request structures to be sent reliably.

Highlights

  • RPC Method Change: The ListTasks RPC method has been updated from using an HTTP GET request to an HTTP POST request.
  • Reason for Change: This modification is necessary because the ListTasksRequest message includes a google.protobuf.Struct field, which cannot be properly serialized into URL query parameters for a GET request.
  • Payload Handling: By switching to POST, the entire request message can now be sent as a JSON payload within the request body, resolving the data serialization issue.
  • Endpoint Update: The HTTP endpoint for the ListTasks method has been changed from /v1/tasks to /v1/tasks:list.
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Code Review

This pull request correctly changes the ListTasks RPC from using HTTP GET to POST. This is a necessary change to support the google.protobuf.Struct field in the request message, which cannot be passed as a URL parameter. The new implementation with post: "/v1/tasks:list" and body: "*" aligns with established API design patterns for such cases. I've added one minor suggestion to improve code documentation for future clarity.

@iliesicatrinel iliesicatrinel changed the title Change ListTasks from GET to POST rpc fix(spec): Change ListTasks from GET to POST rpc Nov 24, 2025
@iliesicatrinel iliesicatrinel changed the title fix(spec): Change ListTasks from GET to POST rpc fix(spec): Remove metadata field from ListTasksRequest Nov 25, 2025
@herczyn herczyn added the TSC Review To be reviewed by the Technical Steering Committee label Nov 26, 2025
@github-project-automation github-project-automation bot moved this to Backlog in TSC Review Nov 26, 2025
@herczyn herczyn merged commit b6ef9ee into a2aproject:main Nov 29, 2025
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@github-project-automation github-project-automation bot moved this from Backlog to Done in TSC Review Nov 29, 2025
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@herczyn Technically we are currently supposed to have two TSC reviews to sign off on small changes and a full vote for more significant decisions. Maybe @amye can change the branch protection rules to enforce the two sign offs.

I think this change is fine. We can always add it back once we figure out how to do the automatic translation. We may have to declare it as a string in the proto and then define the serialization rules to create the metadata as a string.

darrelmiller pushed a commit that referenced this pull request Mar 12, 2026
🤖 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>
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[Bug]: ListTasks doesn't support passing 'google.protobuf.Struct' via GET

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