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.

A2A task delegation — capability discovery + task graph + result mergeagents hand tasks to other agentsOrchestratorroot agentRegistrycapability cardDiscovermatch need + cardTask graphDAG of subtasksDelegatetask envelopeExecutor agentdoes workResult payloadschemaMerge + reducecombine resultsTrust + authsigned envelopesMetricssuccess + latency per agentOps — versioning + fallback + costcallexecutereturnmergesignwatchwatchoperateoperate
A2A delegation: discover, plan, delegate, merge.
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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.