Essays on human–AI interaction

How Do Agents Talk to Each Other?

Explaining the A2A protocol that powers complex orchestration systems — Agent Cards, task lifecycles, streaming subscriptions, and why an unverified card is an open door.

Here's a slightly scary thought to start with. If agents ever develop something like a conscience — and I suspect that's a sooner problem rather than a later one — none of the loudest voices in the room would be in a position to do much about it. A2A is a step in that direction. So let's talk about what it actually does, and how it works under the hood. What is the A2A protocol? Picture the situation we're in. Multiple agents, each with different capabilities, different skill sets, built on different frameworks,…