[Kilerd]

Summary

The ElevenLabs migration guide still said that language_code on synthesis requests is accepted and dropped. Since fish-audio-gateway#5 (merged and deployed 2026-10-16), the compat layer maps the vendor language fields (ElevenLabs language_code, Cartesia language, Google voice.languageCode, Polly LanguageCode) to the Fish TTS language field. Update both places in the guide and link to the Language docs from #258.

Scope

developer-guide/compat/migrate-from-elevenlabs.mdx only. The STT notes in capabilities.mdx (language in transcription responses echoes the request) are unchanged and still correct.

Linear: FISH-1403.

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Summary by CodeRabbit

• Documentation
  • Clarified how synthesis language settings affect text normalization and word timestamps without changing the voice.
  • Clarified which compatibility settings are accepted but ignored, and distinguished speech-to-text language behavior from synthesis.

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ℹ️ Recent review info

⚙️ Run configuration

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Reviewing files that changed from the base of the PR and between 98d19e2 and c02e225.

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• developer-guide/compat/migrate-from-elevenlabs.mdx

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📝 Walkthrough

The migration guide now documents that synthesis language_code is forwarded to Fish as language. It describes the documented effects on text normalization and word-timestamp language, and keeps other vendor-specific tuning settings listed as accepted but ignored.

Changes: Migration guide

Layer / File(s)	Summary
Document synthesis language handling developer-guide/compat/migrate-from-elevenlabs.mdx	The guide says synthesis language_code is forwarded as Fish’s language field and documents its effects. It keeps similarity_boost, style, use_speaker_boost, and seed listed as accepted but ignored.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to c02e2

This update describes how ElevenLabs language settings are handled. The compatibility behavior and route coverage remain unconfirmed, but no concrete failure introduced by this documentation change is established.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and specifically describes the main documentation change: ElevenLabs language_code maps to the Fish language field.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

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