Voice agent multilingual language list is now server-driven
GET /v1/agents/voices now returns a multilingual_languages field listing every language an agent may declare in additional_languages, so language pickers render from the live set instead of a hard-coded list that drifts out of date.
The answer to “which languages can my agent speak?” is now an API call, not a doc table.
GET /v1/agents/voices returned voices. It now also returns multilingual_languages — every language an agent may declare in additional_languages. Render a language picker from this list rather than hard-coding one, because the supported set grows as the voice catalogue expands and a stale client list would offer languages the server rejects on save.
This extends the multilingual agents support introduced on 2026-07-24. The shape of additional_languages is unchanged.
See the docs changelog for the full details.