Optionalitem_OptionalkeyFilter items by their exact key (object key / filename). Keys are unique
per source, so combine with source to disambiguate across data sources.
Optionalmetadata_JSON-encoded Vectorize filter for metadata filtering.
OptionalpageOptionalper_OptionalsearchSearch items by key name.
Optionalsort_Sort order for results.
OptionalsourceFilter items by source (e.g. "builtin" or "web-crawler:https://example.com").
OptionalstatusFilter items by processing status.
Filter items by their unique ID. Returns at most one item.