ADK and A2A validator pattern

Google's ADK and Agent2Agent example splits a multi-agent workflow between a Gemini extraction agent and a deterministic validation agent written in Go. Why it matters: Reliable agent systems often need deterministic checks around probabilistic model outputs. Separating extraction from validation creates a clearer boundary for testing and review.

Try this: For one extraction workflow, put model output through a separate validator that checks schema, required fields, and unacceptable values before any downstream action runs.