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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.

0.5.0 (2026-02-15)

Features

A2A spec-compliant wire format — client sends standard method names (message/send, message/stream, tasks/get, tasks/cancel, tasks/resubscribe, tasks/list)
Outgoing message parts automatically converted to wire format (type → kind) with auto-generated messageId
SSE stream parser unwraps JSON-RPC envelopes and normalizes kind-based events (status-update, artifact-update, task) to internal format
discoverAgent() now accepts auth and headers options for authenticated agent card discovery
New examples/ directory with echo server (pnpm echo) for quick A2A Inspector testing, OpenAI dual-protocol server (pnpm agent), and LangSmith client test (pnpm test-langsmith)

Fixes

LangSmith A2A compatibility — handle both contextId (camelCase) and context_id (snake_case) in task responses

Improvements

Examples reorganized from example/ to examples/ with client/ and server/ subdirectories

0.4.0 (2026-02-15)

Features

Task state transition validation via VALID_TASK_TRANSITIONS map and canTransitionTask() helper
Retryable error metadata — internal server errors include { retryable: true } in error data
A2AError.retryable getter for clients to check if a failed operation can be retried

Improvements

handleCancelTask() returns INVALID_PARAMS error when attempting to cancel a task in a terminal state
Promise-based message handlers now correctly transition through working before completed
createJsonRpcError() accepts optional data parameter for richer error responses