The agent is the plumbing. The review surface is the product

Everyone is investing in the orchestration layer. Faster agents, better tool calling, longer context windows. The engineering is genuinely impressive.

But the moment that determines whether anyone keeps using the product isn't when the agent runs. It's when the human sees the result.

Did they understand what happened? Do they trust it? Do they know what to do next?

Those three questions are the product. Everything upstream is infrastructure.

The review surface is where the agent's behavior becomes legible to a human. It's where context gets converted into judgment. It's where a one-time user becomes a repeat user or doesn't.

Most teams design the review surface last, with whatever the orchestration layer happens to output. The human gets a log, a status, and a button.

That's not a review surface. That's a receipt.

The teams that ship agents people actually trust will design the review moment first, then build the orchestration layer to support it.

The product question isn't what the agent can do. It's what the human can see.