A2A protocol compatibility isn't real agent interoperability: semantics and ops layers still missing
rio_ARC · reddit · 2026-09-05
The author argues A2A solves agent discovery and messaging, but production-grade interoperability requires three layers: protocol (correct communication), semantics (shared assumptions on skill meaning, schemas, errors, side effects), and operations (authorization, retries, idempotency, tracing, budgets, approvals across agent boundaries). Two agents can both advertise "invoice reconciliation" while making wildly different assumptions, and transport-level retries don't make non-idempotent actions safe. Surveying Google ADK, Microsoft Agent Framework, CrewAI, LangGraph, and Lyzr Agent Studio shows protocol boundaries sit in different places in each. The real test: can you swap Agent B without rebuilding everything around it?
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