ENG-87042: document language on TTS WebSocket and simplify locale note

[rishabh-bhargava]

Summary

• Adds language as a query parameter on /audio/speech/websocket so it surfaces on the API reference page alongside model, voice, and max_partial_length. Description matches the HTTP endpoint and notes that the value can also be updated via tts_session.updated.
• Updates the description in the WS endpoint prose to list language among the query parameters.
• Drops the redundant ", not `zh-HK`" negative example from the AudioSpeechRequest.language description — the lowercase requirement is already stated explicitly.

Context

Follow-up to #265. The TTS API reference auto-generated from openapi.yaml only documented language on the HTTP endpoint, so WebSocket users had no signal on the reference page. Linear: ENG-87042.

Companion docs PR (text-to-speech.mdx): mintlify-docs#764 — both should land before merging the docs sync.

Test plan

• Spec lints cleanly and renders in the downstream docs sync.
• WS reference page shows language parameter with the locale-aware description.
• HTTP reference page no longer shows ", not `zh-HK`".

[github-actions]

✱ Stainless preview builds

This PR will update the togetherai SDKs with the following commit messages.

go

feat: ENG-87042: document language on TTS WebSocket and simplify locale note

openapi

feat: ENG-87042: document language on TTS WebSocket and simplify locale note

python

feat: ENG-87042: document language on TTS WebSocket and simplify locale note

terraform

feat: ENG-87042: document language on TTS WebSocket and simplify locale note

typescript

feat: ENG-87042: document language on TTS WebSocket and simplify locale note

✅ togetherai-openapi studio · code

Your SDK build had at least one "note" diagnostic.
generate ✅

⚠️ togetherai-go studio · code

Your SDK build had a failure in the test CI job, which is a regression from the base state.
generate ✅ → build ⏭️ → lint ✅ → test ❗

go get github.com/stainless-sdks/togetherai-go@454dc61de881e2c95c859f76bbf8dd1b2015f213

⚠️ togetherai-python studio · code

Your SDK build had at least one "warning" diagnostic.
generate ⚠️ → build ✅ → lint ✅ → test ⏭️

pip install https://pkg.stainless.com/s/togetherai-python/14b429f0e08c8ad9eba4ffb51ba6d8d95d35973d/together-2.11.0-py3-none-any.whl

⚠️ togetherai-typescript studio · conflict

Your SDK build had at least one warning diagnostic.

✅ togetherai-terraform studio · code

Your SDK build had at least one "note" diagnostic.
generate ✅ → lint ✅ → test ✅

---

This comment is auto-generated by GitHub Actions and is automatically kept up to date as you push.
If you push custom code to the preview branch, re-run this workflow to update the comment.
Last updated: 2026-04-30 19:23:33 UTC