rig acp serve runs OpenRig as an ACP agent over stdio. A prompt becomes a queue row to the receiver named by --to, attributed to the caller (--as, the seat environment, or the default person) with the session's follow-up lineage in its body; the turn follows the row and its handoffs, including handoff-and-complete's done/handed_off_to form, and ends with the team's result, naming the closer from the row's closing transition. The row ID is chosen before the create: when a create gets no answer, a readback that finds the row carries on, and one that doesn't keeps the ID as unconfirmed in the session's lineage; an answered 4xx is a plain refusal and a 5xx stays unknown. The JSON-RPC peer splits into the existing client end and a new stream end over stdin and stdout, with no protocol SDK dependency. The queue is the only store, and a 2 s poll follows open turns.
Mike Schwarz
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