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Changelog

All notable changes to this project will be documented in this file.

[Unreleased]

[0.1.1] - 2026-02-08

Added

  • Client auth challenge/retry flow: both REST and JSON-RPC transports automatically handle 401 responses by invoking a configurable on_auth_challenge callback, merging the resulting headers, and retrying the request.
  • Push notification config CRUD endpoints on both transports and server plugs (set, get, list, delete) with version-aware method names and field mappings.
  • Extended agent card endpoint (GET /extendedAgentCard for latest, GET /card for v0.3) on REST and corresponding JSON-RPC methods.
  • Compatibility setting for non-standard v0.3 REST message wire format used by the official JS and Python SDKs (wire_format: :proto_json). Handles differing field names (parts vs content, role enums, push notification config keys).
  • A2A.Types module with wire_format and version type definitions and wire_format_from_opts/1 helper for version-based defaults.
  • A2A.Server.ExecutorRunner for arity-aware executor invocation, supporting both {Module, opts} and bare Module patterns with optional config injection.
  • Content-Type validation on server plugs accepting application/json and application/a2a+json.
  • www-authenticate header support on 401 error responses from server plugs.
  • Subscribe verb configuration (:get, :post, or :both) on the REST server plug.
  • Stream task-first ordering: server plugs buffer non-task events until the first task event is emitted to ensure correct event ordering.
  • Request and stream timeout configuration on server plugs.
  • Resume/resubscribe support with flexible cursor field name handling (cursor, lastEventId, last_event_id).
  • JS SDK compatibility mode for JSON-RPC push notification field names (jsonrpc_push_compat: :js_sdk).
  • Cross-SDK end-to-end test suites (Elixir client/JS server and JS client/Elixir server).
  • Extensive new unit and integration tests covering transport auth retry, wire format matrix, client-server parity, push notifications, JSON-RPC extensions, and server handler edge cases.

Fixed

  • REST decoder now accepts JSON arrays in addition to JSON objects.
  • Push config set request body shape corrected to match spec.
  • Push config list response shape corrected to match spec.
  • Agent card endpoint path corrected (/.well-known/agent-card.json and /card).
  • JSON-RPC push notification parameter parsing accepts both taskId/configId and id/pushNotificationConfigId for cross-SDK compatibility.

[0.1.0] - 2026-01-29

Added

  • REST and JSON-RPC transports with SSE streaming.
  • Plug-based server handlers with request ID passthrough and timeout handling.
  • Task store behavior and ETS adapter with cursor pagination.
  • Push notification delivery and webhook validation.
  • Extension negotiation helpers and version compatibility options.
  • SSE reconnection utilities and artifact merge helpers.
  • gRPC transport placeholder returning unsupported operation errors.