ai_score, ai_text, ai_number, ai_boolean) or a contact_collection field. Create custom fields via the Custom Fields API first.company_ids, list_id, or advanced_search; companies beyond this limit are not processed. Split larger selections across multiple jobs.advanced_search to enrich the companies matching a search query without listing their ids yourself. You control the selection with sort (which matches to prefer), page.size (how many to enrich), and excluded_company_ids (matches to skip). Add a list_id alongside advanced_search to also save the matched companies to that list before they are enriched.enrichment_strategy: "preview" with a prompt and an output_type — no custom_field_id needed — to dry-run the prompt against a sample of up to 100 of the targeted companies. Nothing is written: no custom field values, no list changes. The per-company results are returned on the job resource once it completes. contact_collection fields cannot be previewed.companies:read OAuth2 scope.