instructions property
Instructions is the agent's system prompt, verbatim, up to 32 KiB. It is the one field the list read withholds, because it is the agent's whole behaviour and a page of them would be a page of prompts.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? instructions;