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Generate speech audio from text using HeyGen's Starfish TTS model.
Passed 20 of 21 test cases with the skill, and 11 of 21 without it.
and 12 more in the full report
10 fixed11 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 9 test cases the skill fixed. Same model, same prompt, with and without the skill.
We want to pass a locale code like 'en-US' to a voice during audio synthesis on HeyGen. What attribute on the voice object must be checked first?
| Checked | Without skill | With skill |
|---|---|---|
| Verifies that support_locale is true on the target voice record | Missed | Passed |
The instructions your model reads when the skill loads.
Generate speech audio files from text using HeyGen's in-house Starfish TTS model. This skill is for standalone audio generation — separate from video creation.
All requests require the X-Api-Key header. Set the HEYGEN_API_KEY environment variable.
curl -X GET "https://api.heygen.com/v1/audio/voices" \
-H "X-Api-Key: $HEYGEN_API_KEY"
If HeyGen MCP tools are available (mcp__heygen__*), prefer them over direct HTTP API calls.
| Task | MCP Tool | Fallback (Direct API) |
|---|---|---|
| List TTS voices | mcp__heygen__list_audio_voices | GET /v1/audio/voices |
| Generate speech audio | mcp__heygen__text_to_speech | POST /v1/audio/text_to_speech |
mcp__heygen__list_audio_voices (or GET /v1/audio/voices)mcp__heygen__text_to_speech (or POST /v1/audio/text_to_speech) with text and voice_idaudio_url to download or play the audioRetrieve voices compatible with the Starfish TTS model.
Note: This uses
GET /v1/audio/voices— a different endpoint from the video voices API (GET /v2/voices). Not all video voices support Starfish TTS.
curl -X GET "https://api.heygen.com/v1/audio/voices" \
-H "X-Api-Key: $HEYGEN_API_KEY"
test cases passed, vs 11 / 21 without
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