* a2a: conform to external A2A clients — well-known path + spec SSE events
The A2A gateway interoperated go-micro-to-go-micro but a real external
client (ADK, LangGraph, a2a-SDK) would not:
- Discovery: served the Agent Card at /.well-known/agent.json, but A2A
0.3.0 discovers it at /.well-known/agent-card.json. Serve both, with
agent-card.json canonical and agent.json a legacy alias — per-agent,
per-skill, and at the single-agent top level.
- message/stream emitted repeated full Task snapshots. External SSE
clients parse by `kind` and stop on `final:true`; a Task snapshot has
neither, so they never terminate. Emit spec-shaped TaskArtifactUpdate
(append) chunks and close with a TaskStatusUpdate final:true. The
non-streaming and resubscribe paths also close with a terminal marker.
- A streaming error set both `result` and `error` in one JSON-RPC
response (strict clients reject it). Emit a failed status-update
instead — never result and error together.
Tests assert the canonical card path, the status-update/artifact-update
event shapes ending in final:true, and that no response carries both
result and error.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CmdEY7pYmV5zzwCjNJ4ykL
* harness: update a2a-streaming to the spec-shaped stream events
The A2A gateway now emits artifact-update deltas and a terminal
status-update (final:true) instead of repeated full Task snapshots, so
the conformance harness must reassemble the answer from the append
artifact-update chunks and assert the final:true marker. This makes the
harness a stronger spec check rather than a snapshot-shape check.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CmdEY7pYmV5zzwCjNJ4ykL
* agent: update a2a stream test to spec-shaped events
TestA2AStreamUsesAgentChatPathWithTools decoded the last SSE event as a
completed Task snapshot with artifacts. The gateway now closes the stream
with a status-update (final:true) and carries the answer as append
artifact-update deltas, so reassemble the answer from those deltas and
assert the terminal completed status-update instead.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CmdEY7pYmV5zzwCjNJ4ykL
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Co-authored-by: Claude <noreply@anthropic.com>
Asim Aslam