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Changelog

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

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

Added

  • A2A.Plug task-level authorization hook for tasks/get, tasks/cancel, and tasks/list
  • A2A v1.0 wire format on encode: flat Part (no kind, with text / data / raw / url / mediaType / filename); Task, Message, and Artifact no longer carry a kind field; AgentCard top-level url and protocolVersion removed (now per-interface under supportedInterfaces[]). Decoder accepts both v1.0 and the legacy v0.3 nested-file form, so v0.3 clients keep working.
  • Message.reference_task_ids, Artifact.extensions, and AgentCard.signatures struct fields for v1.0 data carriage.
  • A2A v1.0 extension mechanism: A2A.Extension behaviour with declaration/1, activate/3, handle_request/3, and handle_response/3 callbacks; A2A.AgentExtension struct for declarations; A2A-Extensions header negotiation in A2A.Plug and A2A.Client; merge of declared extensions into the agent card's capabilities.extensions; context.extensions map for agents to read per-request activations; A2A.Extension.Timestamp as a reference implementation.
  • A2A v1.0 A2A-Version header negotiation: A2A.Version helper module; A2A.Plug :versions option (defaults to ["0.3", "1.0"]) validates the request header and returns VersionNotSupportedError (-32009) for unsupported versions; negotiated version echoed in the response header. A2A.Client :version option (defaults to "1.0") sets the request header on every call; A2A.Client.version/1 reads the server's echoed value. Missing/empty headers are interpreted as "0.3" (spec §3.6.2) and only Major.Minor is significant.

Changed

  • TaskStatus.timestamp is now serialized with a Z suffix (UTC) per the v1.0 schema timestamp regex.
  • A2A.Client now sends v1.0 PascalCase JSON-RPC method names (SendMessage, SendStreamingMessage, GetTask, CancelTask). The server continues to accept both v1.0 PascalCase and the legacy v0.3 slash-style names. Pointing the client at a strict v0.3-only server that doesn't accept PascalCase is a breaking change.

[0.2.0] - 2026-03-06

Added

  • Telemetry instrumentation for call, message, cancel, and task transitions
  • Security scheme data modeling (A2A.SecurityScheme.* structs) on AgentCard
  • Auth middleware (A2A.Plug.Auth) — Bearer, Basic, API key, OAuth2, OpenID Connect
  • TCK compliance across all categories (mandatory, capabilities, quality, features)
  • TCK results posted as PR comments in CI

Fixed

  • Accept v1.0 field names (bytes/uri) in FileContent decoding
  • Reject messages with missing messageId or empty parts per spec
  • Reject negative historyLength on all methods
  • Reject cancel on tasks in terminal states (completed/canceled/failed)

Changed

  • CI runs full TCK suite (bin/tck all) instead of mandatory only

[0.1.1] - 2026-03-03

Added

  • Automated Hex publishing to actioncard org on GitHub releases
  • Dependabot configuration for Mix deps and GitHub Actions
  • Issue and PR templates

Fixed

  • Minor doc cleanups: internal module references, typespec refinement

[0.1.0] - 2026-03-03

Added

  • A2A protocol types: Task, Message, Part, Artifact, Event, FileContent
  • Agent behaviour (A2A.Agent) with runtime and state management
  • Agent card discovery (A2A.AgentCard) with full wire-format support
  • JSON-RPC 2.0 transport layer (A2A.JSONRPC) with request/response/error types
  • Plug-based HTTP server (A2A.Plug) with SSE streaming support
  • HTTP client (A2A.Client) with SSE streaming via Req
  • Task store behaviour (A2A.TaskStore) with ETS implementation
  • Agent registry and supervisor for multi-agent deployments
  • Comprehensive JSON encoding/decoding with A2A.JSON
  • A2A TCK (Technology Compatibility Kit) compliance