OptionalbotmessageContextInfo.botMetadata.botResponseId (when present)
OptionalrawOptionalresponseunified response_id (when present)
Optionalsocialconvenience: every social-entity embed (addSocialEntity / GenAISocialEntityItem) found in the card
convenience: texts of every suggestion pill
flat text rendering of the whole card (headings, text, fenced code, tables)
Result of readRichMessage().
found: falsemeans the input is not a rich response.