OptionaldeferredIds of functions referenced in the system message that were marked as
deferred (~{?functionId}). Providers that support deferred tool
loading can use this to set the appropriate flag on the tool definition
and include the tool search tool in the request.
OptionalfunctionAll functions references in the system message.
OptionalisWhether the prompt variant is customized
OptionalpromptThe prompt variant ID used
System message content, enriched with function descriptions.