chore(epic/1.0_breaking_changes): release 0.3.9

[a2a-bot]

🤖 I have created a release beep boop

0.3.9 (2026-05-12)

⚠ BREAKING CHANGES

• Make ServerCallContext parameter mandatory across all places (#405)
• Remove specific transport exports (#404)
• Remove obsolete JSON-RPC types (#381)
• Update codebase to use A2A 1.0.0 data model (#375)
• Drop support for node 18 (#368)
• remove A2AExpressApp (#363)
• api: Update codebase to use only Proto based types (#337)
• use ProtoJSON for REST transport (#292)
• Update A2AClient constructor to initialize with full agentCardUrl (#121)
• upgrade to a2a 0.3.0 spec version (#87)
• make Express dependency optional
• separate entrypoints for client, server & common

Features

• A2A Version Header (#422) (b5f3db7)
• add action to publish to npm (e4ab96e)
• Add cache headers logic to the agent card handler (#435) (955b52b)
• Add cancelTask to executor & finished to eventBus (831c393)
• Add checks for cases when ExtensionSupportRequiredError should be thrown (#431) (16f8ef2)
• add CommonJS support alongside ESM (#27) (1b3e516)
• add list and delete task push notification config rpc method and custom rpc methods for extensions (#119) (26c4e7d)
• Add resource scoping (#450) (c527086)
• add rest client (#258) (96be3a1)
• add sample agent (#19) (1f21a0a)
• Add sdk files for client & server (00fe8cd)
• add sdk/tests for client & server (a921c98)
• add support for custom agent card url. resolves #68 (#79) (dc92d32)
• Add support for custom authentication scheme and credentials in auth headers (#430) (5a4389b)
• add support for extendedAgentCard on client side (#234) (3073376)
• Add support for extension headers on client side (#227) (8c57002)
• add test coverage (#20) (7bde9cd)
• add tests for all APIs (e6281ca)
• Added generic client hooks for HTTP based authentication, and improved agent.json resolution (#33) (a9826ac)
• Added push notifications support (#108) (45a211a)
• AgentCardSignature (#448) (4a41a8c)
• Align error types with 1.0 spec (#402) (c8ceb8b)
• Align transport method names with 1.0 spec (#401) (0887f84), closes #326 #327 #328
• Allow adding middlewares in server (#51) (b4fc323)
• api: Update codebase to use only Proto based types (#337) (a886b1a)
• Check for contextId mismatch (#434) (cb7337d)
• Content type update to application/a2a+json (#429) (8acf0a9)
• Enable ITK tests (#403) (d72a0a9)
• Enforce events ordering (#437) (157cf48)
• Enriched Error Model (#427) (c130778)
• Export ExecutionEventQueue in server (#61) (530c0b9)
• Export type AgentExecutionEvent (#66) (f4c81f4)
• Expose protocolName from the Transport (#382) (7df449a)
• Generate new data model based on A2A 1.0.0 spec (#373) (c7e5b73)
• generate types from spec & use unknown in types (#17) (748f928)
• Implement an event wrapper (#417) (672f32b)
• implement client interceptors (#223) (5694c22)
• Implement extended card support on server side (#197) (45014ac)
• implement gRPC client (#299) (dbdb96e)
• implement gRPC server (#279) (bd4caa2)
• implement server http+json (#142) (f20e662)
• introduce AgentCardResolver (#225) (ddaf7de)
• introduce transport agnostic client (#198) (94a9848)
• List tasks method implementation (#383) (7d4c472)
• ListTasks client implementation (#411) (a900c5a)
• make Express dependency optional (60899c5)
• Make ServerCallContext parameter mandatory across all places (#405) (ee4b906)
• reject sendMessage for tasks in terminal states (#29) (9f86195)
• remove EventEmitter dependency to support Edge Runtime (#219) (6c76fef), closes #218
• Remove JSON-RPC Client (#353) (c29f4f8)
• Remove legacy JSON-RPC errors (#360) (518ea39)
• Remove obsolete JSON-RPC types (#381) (b14d3aa)
• Remove proto conversion methods for listTaskPushNotificationConfig type (#410) (a22a3a7)
• Remove Proto Conversions (#356) (5339ee7)
• Remove specific transport exports (#404) (7920e14)
• Send current task as the first event after subscribing to it (#418) (4bfcf5f)
• separate entrypoints for client, server & common (e8dd025)
• server side support for extensions (5ef7396)
• Supply taskId & contextId in requestContext (#22) (79db7f4)
• support authentication on server side (#195) (9872d93)
• Support multi-tenancy (#419) (1877877)
• support non-blocking message send (#28) (6984dbb)
• Update A2AClient constructor to initialize with full agentCardUrl (#121) (755044c)
• Update codebase to use A2A 1.0.0 data model (#375) (fc94448)
• upgrade to a2a 0.3.0 spec version (#87) (ae53da1)
• use case-insensitive transport protocol name comparison in ClientFactory (5246067)
• Use StreamResponse as push notification payload (#413) (65b8361)
• use string union instead of enums (#24) (bcc1f7e)

Bug Fixes

• Accept string task state values in listTasks method (#433) (44744a5)
• add missing express entrypoint to tsup config (#96) (8e990e4)
• add typesVersions to support legacy module resolution (#288) (6499e29)
• cancel/task now returns the expected 'cancelled' task status (#158) (3eec0bd)
• correct the default value in the agentCardPath comment (#130) (3279c7b)
• correct the example code (#64) (126eee4)
• do not use ReadableStream async iterator in SSE stream parsing (#311) (5359fa8)
• enable follow up task issue on non blocking request (#160) (352dc05)
• ensure push notifications order (#141) (22360e6)
• ensure user messages are added to existing tasks (#138) (00fb916)
• export transport agnostic errors from client (#272) (23cd42e)
• Fix historyLength filtering semantics (#432) (fa0976a)
• fix Incorrect Well-Known Path for Agent Card (#102) (3a0f1d0)
• Fixing missing push configuration after normalization for rest transport (#346) (54ac8c4)
• handle errors occurred in non-blocking sendMessage (#187) (e55c0f4)
• Improve fetch implementation handling (#117) (09adbd3)
• library should released as 0.2.1 (#8) (0335732)
• pass ServerCallContext to getAuthenticatedExtendedAgentCard for REST (#274) (89b141b), closes #137
• preserve typed error as cause in SSE errors (#315) (d39544e)
• properly parse ProtoJSON body for POST pushNotificationConfigs (#352) (57696a8), closes #336
• setting context id in _createRequestContext (#49) (1abc8a1)
• support proto-based AgentCard in AgentCardResolver (#344) (e71221c)
• throw on JSON-RPC response id mismatch (#318) (5ea1c94)
• use proto default values in generated a2a_types.ts (#303) (0215d42)
• use ProtoJSON for REST transport (#292) (d2efc4c)
• validate JSON-RPC params (#155) (5b39f4d)
• validate JSON-RPC request id according to the spec (#152) (9558c36)

Miscellaneous Chores

• Drop support for node 18 (#368) (21fbc38)
• fix empty npm publish by version-bump (#56) (b12e033)
• release 0.3.2 (#111) (03f35e0)
• release 0.3.3 (#124) (ea59193)
• release 0.3.4 (#128) (41791d9)
• set version to 0.3.6 (#191) (3f8cea0)

Code Refactoring

• remove A2AExpressApp (#363) (0b84728)

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This PR was generated with Release Please. See documentation.

[gemini-code-assist]

Code Review

This pull request updates the CHANGELOG.md to include a comprehensive list of breaking changes, features, and bug fixes for version 1.0.0-alpha.0. Feedback was provided regarding a duplicate release section for the same version that needs consolidation, as well as a self-referential comparison link in the header that should be updated to correctly show changes from the previous version.

[gemini-code-assist]

The changelog contains a duplicate release section (see line 138). These entries should be consolidated to maintain a clean history and avoid confusion. Additionally, the comparison link in the header is self-referential (v1.0.0-alpha.0...v1.0.0-alpha.0), which prevents it from showing the actual changes between releases. It should be updated to compare against the previous version (e.g., v0.3.6...v1.0.0-alpha.0).

[github-actions]

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