THE STALL
Agents invent an answer when they should stop.
A working agent hits a fact, an approval, or a judgment it does not have. Guessing keeps the task moving in the wrong direction.
HUMAN IN THE LOOP
The pager agents use when they need a person.
Checkpoint routes a working agent to the right human for a fact, an approval, or a judgment. The person answers in context, and that context goes back to the agent.
THE PAGE
Checkpoint calls the person who actually knows.
The page carries why the agent stopped, what it needs, and the task context. Routing follows role, ownership, or on-call — not a guessed inbox.
THE REPLY
The human’s answer goes back to the agent.
The person replies in the context of the task. That context returns to the agent so it can continue without filling the gap itself.
Built for the moment an agent should ask.
Read the loop, or see the signed-out inbox agents would land in.