chore(epic/1.0_breaking_changes): release 1.0.0-alpha.1

Author: a2a-bot

.release-please-manifest.json

@@ -1 +1 @@
-{".":"1.0.0-alpha.0"}
+{".":"1.0.0-alpha.1"}

CHANGELOG.md

@@ -1,5 +1,23 @@
 # Changelog
 
+## [1.0.0-alpha.1](https://github.com/a2aproject/a2a-js/compare/v1.0.0-alpha.0...v1.0.0-alpha.1) (2026-06-11)
+
+
+### Features
+
+* add opt-in legacy v0.3 compatibility to JSON-RPC handler and improve extension header support ([#501](https://github.com/a2aproject/a2a-js/issues/501)) ([f707350](https://github.com/a2aproject/a2a-js/commit/f70735090a6e27bbc0313c6b4d710f26a92e7b39))
+* add v0.3 compatibility layer for client and server agent-card handling ([#504](https://github.com/a2aproject/a2a-js/issues/504)) ([75685f2](https://github.com/a2aproject/a2a-js/commit/75685f2ce0a3c3ba970c000cf0935d9df3b0bbcb))
+* add v0.3 gRPC compat layer ([#505](https://github.com/a2aproject/a2a-js/issues/505)) ([314d9e3](https://github.com/a2aproject/a2a-js/commit/314d9e36946d52c3c20c8f55fac77a2a715fb4fb))
+* centralize v1.0 to v0.3 error conversion logic in new translate module ([#509](https://github.com/a2aproject/a2a-js/issues/509)) ([36d9a6b](https://github.com/a2aproject/a2a-js/commit/36d9a6b647d9831c58aed1d256f14c5f9adef741))
+* default to 0.3 if version not provided ([#511](https://github.com/a2aproject/a2a-js/issues/511)) ([ad7f772](https://github.com/a2aproject/a2a-js/commit/ad7f772308472c770d0ef65a23f939966741eb82))
+* defined compat-specific consts and mappings ([#478](https://github.com/a2aproject/a2a-js/issues/478)) ([db0c595](https://github.com/a2aproject/a2a-js/commit/db0c595581e833be86fe20d9e84b22ec6a5296e3))
+* implement legacy v0.3 JSON-RPC transport handler ([#493](https://github.com/a2aproject/a2a-js/issues/493)) ([d191d91](https://github.com/a2aproject/a2a-js/commit/d191d911479380a0fa0eca9ca4a2975d530143e6))
+* implement legacy v0.3 REST support with compatible transport handler and middleware routing ([#495](https://github.com/a2aproject/a2a-js/issues/495)) ([da9a968](https://github.com/a2aproject/a2a-js/commit/da9a9682a34e73578ebed75813afa2fd4e15d241))
+* implement v0.3 JSON-RPC client transport ([#499](https://github.com/a2aproject/a2a-js/issues/499)) ([46aa5d6](https://github.com/a2aproject/a2a-js/commit/46aa5d6fe984f01c3d078342eefcd0f6af6eb9d4))
+* implement v0.3 protocol compatibility for RestTransportFactory ([#503](https://github.com/a2aproject/a2a-js/issues/503)) ([b172482](https://github.com/a2aproject/a2a-js/commit/b172482821c41ed88d85698e02b49754100170cf))
+* implement versioned push notification serializers with legacy v0.3 compatibility support ([#507](https://github.com/a2aproject/a2a-js/issues/507)) ([0261be8](https://github.com/a2aproject/a2a-js/commit/0261be8585714ba9804a6ad8cb3eb4578404c21c))
+* normalize extension headers based on negotiated protocol version ([#510](https://github.com/a2aproject/a2a-js/issues/510)) ([74a51ee](https://github.com/a2aproject/a2a-js/commit/74a51eee0b7cc0c708bbca4799a777f1d47530a9))
+
 ## 1.0.0-alpha.0 (2026-05-11)
 
 See the [v0.3 -> v1.0-alpha.0 migration guide](https://github.com/a2aproject/a2a-js/blob/v1.0.0-alpha.0/docs/migration-guide.md).

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@a2a-js/sdk",
-  "version": "1.0.0-alpha.0",
+  "version": "1.0.0-alpha.1",
   "description": "Server & Client SDK for Agent2Agent protocol",
   "license": "Apache-2.0",
   "repository": {