List supported voices
Returns currently supported public choices. agent_id resolves the supported catalogue for that agent. Without agent_id, it returns the catalogue of the voice model that createAgent gives a new agent, so a voice_id can be chosen for initial_draft.voice before the first agent exists. An empty page means no voice model is ready for that agent or for new agents; service-unavailable is not an empty catalogue.
Authentication
Create and manage workspace-owned keys through the existing app session routes, outside this public API. Creator and manager identities are audit actors only. Key validity follows workspace policy, expiry and explicit revocation, independently of creator membership. Do not include a workspace-selection header.
Query parameters
Page size; 50 by default, at most 200.