New workflow builder now supported in Sandboxes

What it is

Sandboxes will support workflows built with the new Agent Hub workflow builder. Those workflows will copy to your sandbox when you create or resync it, the same way workflows built with the legacy builder already do. HubSpot lists it as In Development, expected November 19, 2026.

Why it matters

Sandboxes are where you test changes safely before they reach production. Until this lands, a workflow built in the new builder does not come along into a sandbox, so this is the piece that lets you test new-builder workflows the way you already test legacy ones.