music-gen

name	music-gen
description	Generate songs, instrumental music, or cover versions with MiniMax Music through Zditor Native Agent's http_request tool. Use when the user asks to create or generate music, a song, background music, an instrumental track, lyrics-to-song audio, or a cover, including requests that call this skill music_gen or music-gen.

MiniMax Music Generation

Generate music according to the user's requirements. Preserve requested lyrics, language, genre, mood, instrumentation, vocal style, structure, and intended use. Do not rewrite user-provided lyrics unless requested. Do not imitate a living artist's voice; translate that request into non-identifying musical traits.

Configure

This skill reads its endpoint and credential from the skill's .env file:

MINIMAX_MUSIC_API_URL=https://api.minimaxi.com/v1/music_generation
MINIMAX_API_KEY=<your MiniMax API key or sk-cp subscription key>

Never read, print, or place MINIMAX_API_KEY directly in tool arguments or chat. If it is not configured, ask the user to set it in this skill's .env file. Advise users not to paste API keys into chat.

Choose A Mode

• Song with supplied lyrics: use music-3.0, set lyrics exactly as supplied, lyrics_optimizer: false, and is_instrumental: false.
• Song with generated lyrics: use music-3.0, omit lyrics, set lyrics_optimizer: true, and use the user's subject, language, structure, and musical direction in prompt.
• Instrumental: use music-3.0, omit lyrics, set lyrics_optimizer: false, and set is_instrumental: true. The prompt is required.
• Cover: use music-cover, set a 10–300 character target-style prompt, and provide exactly one of audio_url, audio_base64, or cover_feature_id. Do not send is_instrumental or lyrics_optimizer for cover models.
• Use a -free model only when the user explicitly requests the free tier or lacks paid/Token Plan access. Free models are limited to 3 RPM; paid models are limited to 120 RPM.

For non-instrumental generation, add useful supported structure labels when generating lyrics, such as [Intro], [Verse], [Pre Chorus], [Chorus], [Bridge], [Outro], [Hook], [Build Up], [Inst], or [Solo]. Keep supplied structure labels unchanged.

Generate

Use non-streaming URL output so the completed audio can be downloaded and presented. Default to MP3 at 44.1 kHz and 256 kbps unless the user requests a supported alternative.

Call http_request with this shape, including only fields relevant to the selected mode:

{
  "method": "POST",
  "url_skill_env": {
    "skill": "music-gen",
    "key": "MINIMAX_MUSIC_API_URL"
  },
  "header_skill_env": {
    "Authorization": {
      "skill": "music-gen",
      "key": "MINIMAX_API_KEY",
      "prefix": "Bearer "
    }
  },
  "headers": {
    "Content-Type": "application/json"
  },
  "body": {
    "type": "json",
    "value": {
      "model": "music-3.0"
       
       
       
       
       
         
         
         
      
       
       
       
    
  
   
   

Parameter constraints:

• prompt: up to 2,000 characters. It is required for instrumental music and must be 10–300 characters for covers.
• lyrics: 1–3,500 characters for normal songs; 10–1,000 characters for covers.
• audio_setting.sample_rate: 16000, 24000, 32000, or 44100.
• audio_setting.bitrate: 32000, 64000, 128000, or 256000.
• audio_setting.format: mp3, wav, or pcm.
• Cover reference audio must be 6 seconds to 6 minutes, no larger than 50 MB, and in a common format such as MP3, WAV, or FLAC.

Confirm API success only when the HTTP request succeeds, base_resp.status_code is 0, and data.status is 2. With output_format: "url", read the temporary audio URL from data.audio. The URL expires after 24 hours.

Download And Present

Immediately download data.audio with a second http_request. Use a concise, collision-resistant workspace filename under generated/music/ and an extension matching audio_setting.format.

{
  "method": "GET",
  "url": "<data.audio URL from the generation response>",
  "save_to": "generated/music/<descriptive-name>-<timestamp>.mp3",
  "timeout_ms": 300000,
  "max_response_bytes": 67108864
}

After the download succeeds, call present_artifact with the saved workspace path. Report the model, mode, output format, and file path. Do not claim the exact duration, sample rate, bitrate, or file size unless verified from the response or file metadata.

If the download URL redirects, allow same-origin redirects. If the API returns a URL on a different public HTTPS origin, it is safe to make the second request directly to that returned URL. Never expose the temporary URL when a local artifact has been saved successfully.

Errors And Retries

• 1002: rate limited. Retry at most twice with a delay; respect 3 RPM for free models and 120 RPM for paid models.
• 1004 or 2049: authentication failed. Do not retry; ask the user to verify the configured key.
• 1008: insufficient balance or unavailable entitlement. Do not silently change billing mode or model; explain the issue and ask whether to use a free model.
• 1026: sensitive content. Do not retry unchanged; ask the user to revise the request.
• 2013: invalid parameters. Fix only clear schema violations, then retry once.
• Do not automatically retry a timeout because the service may already have generated the track.

Do not report success if audio generation succeeded but the download failed. In that case, state that generation completed but local saving failed, and offer one download retry while the 24-hour URL remains valid.