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The agent side sends a claim token on every write; this side rejected the field outright, so every state report and every ticket publish answered 400. Both bodies now take it. Underneath that, nothing compared a holder. A run was reachable by any caller on the right machine, and a box names exactly one machine — so two attempts polling the same job presented identical credentials and were told apart only by which one's select landed first. That is timing, not a rule, and no caller could be told which case it was in. The row now remembers which attempt holds it. Taking a claim requires there to be no holder; every write after it requires the caller to be the holder. The same state reported by a different attempt is a lost race and not a retry, and is refused whatever the state is - which is the only thing that separates the two 200s from the 409s. The ticket is held to the claim too, for a worse reason than a double start: the client re-reads the address rather than keeping the first, so a ticket written by a losing attempt produces a client that connects, successfully, to a machine running nothing. The holder is never cleared, including on a terminal state, so a settled claim cannot be replayed and a finished run still records which attempt ran it. It is not in what goes out - holding one permits writing to a run, and the owner reading their own session is not the holder.