Mastering Agentic AI: When Agents Talk to Other Agents (A2A)

mail@carlosprados.com (Carlos Prados) — Tue, 18 Aug 2026 00:00:00 +0000

In my previous post, we tackled Knowledge Retrieval (RAG) — giving a single agent access to facts it wasn’t trained on. That makes one agent smarter. But a lot of real systems aren’t one agent with better knowledge; they’re several agents, each owning a slice of the problem, that need to work together.

The moment you have more than one agent, you have a communication problem. How does Agent A address Agent B? How do they agree on the shape of a message? And what happens when Agent B doesn’t live inside your process at all — it’s a service some other team (or some other company) runs behind an HTTP endpoint?

A2a on EnRedAndo Me - Carlos Prados

Mastering Agentic AI: When Agents Talk to Other Agents (A2A)