List creative folders for the authenticated tenant, optionally scoped to a single parent_id (omit for top-level). Each folder carries `creative_count`. Zero folders is not an empty library — root creatives_list still returns READY_LOCAL files with folder_id=null. Inspect coverage.empty_reason before telling the operator the material library is empty.
NOTE: `updated_at` = "row last touched", NOT "content changed". Bulk maintenance bumps it without content change — to detect content changes, cache the specific field(s) you care about and diff yourself.
REQUIRED: none. Optional: parent_id (str — UUID of parent folder).
EXAMPLE: creatives_list_folders({})
Returns uploaded folders and the account's read-only Google Drive cloud folders. A cloud folder has library_source='cloud' (folder_id gdrive-folder:... where ids are shown); browse it with creatives_list(folder_name=...). Cloud folders cannot be renamed or deleted here, and nothing can be uploaded into them.
ConnectorOAuth