the event as delivered by the subscription
the parsed event, or null when it is malformed
The MJ: AI Agent Sessions ID the event is addressed to.
ISO-8601 instant the server emitted the event.
Type-specific data.
Discriminator. Clients ignore types they do not recognise.
Parses a wire event into a typed event, validating instead of casting.
null(a malformed event is dropped, never delivered half-trusted).null.