Anchorage API reference
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    RUNTIME_DRIVEN_AGENT: unique symbol = ...

    Brand marking an agent as runtime-driven. The thread Durable Object requires it before its message, signal, schedule, or notification-dispatch wake seam may start a run. Queue and state persist rather than wake on idle. Non-owner notifications are recorded for the trusted dispatcher and never send a signal directly. An unbranded agent reports degraded: 'not-runtime-driven' on state and owner-notification responses that reach the sender, regardless of thread state. Skipped state and memory-unavailable responses return earlier and carry no marker.

    Direct core sender calls that mint a run still reach the durable runner, which fails them terminally without executing. Structural so a test double can opt in without constructing a real durable agent.