ARCCHR0010 — Raw Guid response does not set the event source id

For a keyless @command(), tuple(Guid.parse('...'), new Created()) sends the Guid to the caller as an ordinary response. Chronicle still chooses a fallback event source ID. If the ID should identify the new stream, return tuple(eventSourceIdResponse(id), new Created()) or supply the command key through @key(), getKey(), or getEventSourceId().

This type-checked rule recognizes fundamentals Guid values including Guid.create(), Guid.parse(...), and variables, beside a direct new event decorated with @eventType() from @cratis/chronicle or @cratis/chronicle/events. It does not guess from string responses, event factories, indirect return values, or inherited command keys or event-type decorators; an ordinary Guid response may be intentional. See Resolving the event source ID.