# HumanLayer **HumanLayer is human-in-the-loop as a product: an API and inbox that routes agent decisions to people for approval, over Slack, email, or their app.** Agents request permission, humans grant it, everything is logged. Approval gates built as an entire company: evidence that human-in-the-loop UX is a product category of its own. ## References - https://humanlayer.dev ## Related