About Ringback
When your agent hits a wall, your phone gets the question.
Why it exists
An unattended agent reaches a decision it isn't allowed to make (delete this branch? email this prospect? use staging or prod? this contract clause is ambiguous) and there is no path to the human. It either freezes and burns the window, or guesses and produces work that has to be thrown away. Today the workaround is 'have the agent post in Slack and hope I look', which is not blocking, not filtered, and not answerable in one tap.
Who it is for
Ringback targets solo developers, founding engineers, and small AI-native teams at startups and indie studios who are actively deploying autonomous agents (coding agents, SDR loops, LangGraph/n8n workflows) and stepping away from their desk while those agents run. These are hands-on builders who already feel the pain of returning to a stalled or wrong-direction agent loop and have enough autonomy to adopt a new tool without procurement approval. They skew toward early-adopter AI engineers and technical founders in the US/UK/Canada who live in the agent loop daily.
When I leave an autonomous agent running and walk away from my desk, I want it to reach me on my phone the second it hits a decision it can't make, so I can unblock it in a few taps instead of coming back to hours of stalled or wrong work.
What it does
- The Line: copy-paste wiring + blocking ask endpoint
- Pocket Inbox: answer in two taps, see the agent resume
- Ring: push that reaches your pocket, plus an escalation ladder
- Ring Rules: what's worth your pocket buzzing
- Standing Answers: decisions your agent stops asking about
What makes it different
Everyone else gives the agent a way to SEND a message. Ringback gives the agent a way to WAIT for an answer and then resume. It is a blocking human-in-the-loop call: the agent posts a question, holds, gets your decision, continues, and the whole round trip is logged with its latency. And because the founder lives in the agent loop, Ringback filters hard by default: quiet hours and urgency rules decide whether your pocket buzzes, and Standing Answers resolve the questions you've already answered before before they ever reach you.
Who runs it
Ringback is operated by Matias Szarfer.