Worker-bus boot rules (set TAI_BUS_REDIS_URL to enable the bus):
- more than one worker is refused without the bus — sibling workers would serve stale config after a reload with no channel to converge on;
- a non-file TAI_CONFIG_MODE is refused without the bus — an external config provider serves shared config and one instance cannot see its sibling count;
- a manifest that registers a task backend is refused without the bus — the backend-runtime and server processes must converge on reloads. The workers rule lives in this CLI only: an external process manager driving the ASGI factory with its own —workers bypasses it, so set TAI_BUS_REDIS_URL in any multi-process deployment.