music-and-singing-studio

Generates instrumental music or songs with sung vocals. OpenRouter can help draft original lyrics, structure prompts, or translate style notes, but audio generation must use music_generate or song_generate.

Request triage

Before calling tools, extract these fields from the user request:

• task type: instrumental BGM, jingle, short demo, loop, full song, or sung lyrics
• whether lyrics are user-provided, newly original, or a prohibited copyrighted cover request
• target language, target locale/accent, vocal traits, backing style, mood, tempo, and desired duration
• quota posture: short demo first, full generation, or user-specified duration
• output expectation: one playable take, multiple variants, or background bed

OpenRouter can draft original lyrics and prompts, but it is not an audio provider. Do not imply OpenRouter created the audio.

Choose the tool

• Use music_generate for BGM, loopable beds, intro/outro, ads, transitions, and instrumental moods.
• Use song_generate when the user provides lyrics or asks for singing, vocals, chorus, verse, jingle with words, or 唱歌.

Required workflow

1. Confirm whether the user wants instrumental music or sung vocals.
2. Create only original lyrics unless the user provides rights to existing lyrics.
3. Avoid "in the style of" living artists, bands, copyrighted songs, game themes, film scores, or franchise music.
4. Call audio_provider_capabilities if music/singing availability is uncertain.
5. For music_generate, pass a concise prompt, optional style, duration, and output path.
6. For song_generate, pass original lyrics, vocal style, backing style, duration, and output path.
7. Return the result as a playable audio artifact.

Preview-first

For unspecified song length, generate a short demo first instead of a full song. Use 8-15 seconds for sung demos and 10-20 seconds for instrumental BGM unless the user explicitly asks for a longer duration.

For singing, keep first-pass lyrics compact: one hook plus one short verse is usually enough to test vocal language, accent, melody feel, and quota behavior. If the user asks for a complete song, generate or present the full lyrics, but send a short demo to song_generate first and then scale up after approval or after confirming key quota.

If the provider returns quota_retry.strategy=short_preview, treat that as a successful short demo, not as a failed generation.

Tool-result handling

• If music_generate or song_generate returns status=ok, put the playable artifact/path first, then duration, style, and rights summary.
• If song_generate returns quota_retry.strategy=short_preview, say a short demo was generated because the full request exceeded the API key quota.
• If a provider error occurs, quote the note and distinguish account credits, API key quota, feature gating, duration, format, content policy, and network failures.
• If no tool was called, do not speculate about credits or availability. Call the relevant tool or say generation was not attempted.

Availability and credits handling

• Do not claim credits are insufficient unless music_generate, song_generate, or audio_provider_capabilities(probe_live=true) returned that exact provider error.
• If a provider error occurs, quote the tool's note / provider message and distinguish account credits from feature gating, duration limits, output format restrictions, API key quota, and content-policy rejection.
• If song_generate returns status=ok with quota_retry.strategy=short_preview, the song was generated as a shorter playable demo after an API key quota retry. Do not say generation failed; explain that a short version was produced and include the playable artifact.
• If no tool was called, do not speculate about credits. Call the relevant audio tool first or say the generation was not attempted.

Copyright and authorization guard

• Copyright / 版权: do not reproduce protected lyrics, melodies, arrangements, backing tracks, or recognizable artist styles.
• 授权: if the user gives existing lyrics, ask for or record that they own or have permission to use them.
• Public figure policy: do not request a singer, actor, public figure, or band imitation. Use generic traits like "clear warm Mandarin pop vocal".
• If the user asks for a cover, explain that this skill can create an original song inspired by non-identifying mood/tempo/instrumentation instead.

Locale and accent singing notes

For singing, first identify the target language and desired accent. The final vocal should use a locale-appropriate accent. Lyrics, vocal style, and pronunciation notes should match that target.

• Chinese lyrics: keep lyrics in natural Chinese and avoid unnecessary translation through OpenRouter. Use 普通话 phrasing unless the user asks for a dialect.
• English lyrics: preserve requested accent or locale, such as en-US, en-GB, en-AU, en-IN, or en-SG.
• Spanish/Portuguese/French and other languages: keep regional variants explicit when requested.
• If the vocal sounds like the wrong accent, simplify lyrics, reduce code-switching, add punctuation at phrase boundaries, and try a shorter sample before generating the full song.

Output contract

Return:

• provider
• tool used
• duration
• output path
• playable audio artifact status
• copyright/rights summary
• target language / locale assumption
• whether this is a preview or full asset