A2A protocol compatibility isn't true agent interoperability — semantics and ops layers are missing
rio_ARC · reddit · 2026-09-05
The author argues A2A is a big step toward agent interoperability, but protocol compatibility alone doesn't deliver it. Production interoperability needs three layers:
- Protocol: can agents communicate correctly (Messages, Tasks, Parts, Artifacts)?
- Semantics: do agents agree on what a skill means, input/output schemas, errors, partial results, and side effects?
- Operations: do authorization, retries, idempotency, tracing, budgets, evaluations, and approvals survive across the agent boundary?
Two agents can both advertise "invoice reconciliation" under A2A while making completely different assumptions; transport-level retries don't make non-idempotent actions safe. Current implementations (Google ADK, Microsoft Agent Framework, CrewAI, LangGraph/LangSmith, Lyzr Agent Studio) all support A2A but place the protocol boundary in different spots — remote agent, delegation tool, deployed graph, orchestration node. The post calls for a real A2A substitutability/conformance test beyond schema and protocol checks.
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