Why architecture matters here
A2A fails on capability mismatch + auth gaps. Architecture matters because discovery + envelope + trust compose.
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The architecture: every piece explained
The top strip is discovery. Orchestrator. Registry. Discover. Task graph.
The middle row is execution. Delegate. Executor agent. Result payload. Merge + reduce.
The lower rows are ops. Trust + auth. Metrics. Ops — versioning + fallback + cost.
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End-to-end flow
End-to-end: user request. Orchestrator plans 3-subtask DAG. Registry lookup finds A, B, C agents. Signed envelopes sent parallel. Each returns typed result. Orchestrator merges into final answer.