Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add ouzlifaneyassine1-dot/onyx-engine --skill music-trackgit clone --depth 1 https://github.com/ouzlifaneyassine1-dot/onyx-engineWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/ouzlifaneyassine1-dot/onyx-engine/music-track)<a href="https://agentmods.dev/skills/ouzlifaneyassine1-dot/onyx-engine/music-track"><img src="https://agentmods.dev/badge/skills/ouzlifaneyassine1-dot/onyx-engine/music-track/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/ouzlifaneyassine1-dot/onyx-engine/music-track"><img src="https://agentmods.dev/badge/skills/ouzlifaneyassine1-dot/onyx-engine/music-track.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00070 | $0.03262 |
| Opus 5 | $0.00035 | $0.01631 |
| Sonnet 5 | $0.00014 | $0.00652 |
| Haiku 4.5 | $0.00007 | $0.00326 |
Grade A, and why
music-track scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 269 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/music-track — Generate a Loop or Cinematic Music Track
Overview
ElevenLabs Music renders 10–300 seconds of music from a prompt. The output quality depends entirely on prompt specificity: tempo (BPM), key, instrumentation, mood, structural cue. "Epic orchestral" returns generic stock music. "85 BPM, D minor, solo cello and detuned upright piano, sparse, melancholic, no drums, 4/4" returns a usable score for a melancholic exploration scene.
This skill produces one track aligned with the audio bible's music style and dynamic music plan, then wires it as an AudioStreamPlayer on the Music bus with a marked loop point if it's a loop, or as a linear cinematic stream if it's a one-shot.
When to use
- Looped track for a level, biome, menu, or game state (calm / tension / combat).
- Cinematic linear track for an intro, ending, boss reveal, or cutscene.
- Replacing a placeholder loop with on-bible music.
When NOT to use
- Short stings / event punctuation (<5s) → use
audio/sound-effectwith classStinger. - Adaptive layered stems with state-driven crossfades →
audio/adaptive-music. - Ambient bed with no melody →
audio/ambient-bed.
Steps
1. Read the audio bible
Read .onyx/audio-bible.md
The bible names the primary style, tempo range, key center, time signature, and the dynamic music model. This skill writes prompts that respect those numbers.
If no bible exists:
No
.onyx/audio-bible.md. Music without an audio bible drifts into stock-library territory. Run/audio-directionfirst, or I can ship a one-off with explicit defaults — your call.
2. Identify the track's role
Ask if not obvious:
Which slot in the dynamic music plan? Calm exploration, tension, combat, boss, victory, menu, ending, or one-off cutscene?
Each slot has different rules:
| Slot | Tempo | Energy | Instrumentation density | Loop or linear |
|---|---|---|---|---|
| Calm exploration | bible low end (e.g. 70–90) | Low | Sparse | Loop, ≥45s |
| Tension | mid (e.g. 90–110) | Medium, no drums or sparse pulse | Adds one instrument | Loop, ≥45s |
| Combat | high (e.g. 120–150) | High, full drums | Full | Loop, ≥45s |
| Boss | high or low-and-menacing | Distinct from combat | Distinct, named instrument | Loop, ≥60s |
| Victory sting | n/a | Resolution | n/a | Linear, 4–8s (use SFX skill instead) |
| Menu / title | bible mid | Atmospheric | Anchor instrument | Loop, ≥30s |
| Cutscene | varies | Linear arc | Varies | Linear, 60–180s |
| Ending | varies | Linear arc with resolution | Varies | Linear, 60–300s |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 269 lines · 70 tokens per session scan A 3c721853607d
music-track is a skill published in the GitHub repository ouzlifaneyassine1-dot/onyx-engine (0 stars, last pushed 3mo ago), licensed MIT. It adds 70 tokens to every session and 3,262 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other skills, from other repositories
metasounds
Create and modify MetaSound Source assets — add/connect nodes, wire pins, set input defaults, and play procedurally (MetaSoundService). Use when the user asks to create a MetaSound, build or edit a MetaSound graph, add operator/input/output nodes, or generate procedural audio.
adaptive-music
Use when wiring music stems to game state — combat / explore / boss / tension crossfades on a shared bus. Pairs generated stems with a state machine and AudioBus structure. Trigger on "adaptive music", "dynamic music", "music changes when combat starts", "layered music", "vertical music", "wire stems".
voice-line
Use when generating TTS voice lines — NPC barks, narrator, dialogue. Covers where voice ids come from, a character-to-voice decision tree, stability/style/similarity guidance, and the multi-line dialogue case via texttodialogue. Trigger on "make a voice line", "narrator", "NPC says", "voice for the merchant", "TTS…
ambient-bed
Use when generating a long looping location ambience — forest at dawn, dungeon air, city street, spaceship hum, cave drip. Non-melodic, low-energy, never draws attention. Wires as a looping AudioStreamPlayer on the Ambient bus with a marked seamless loop. Trigger on "ambient bed", "room tone", "background ambience"…
audio-direction
Use when defining the sonic identity — music style, instruments, SFX vocabulary, dynamic music plan. Outputs an audio bible at .summer/audio-bible.md. Trigger on "audio direction", "audio bible", "music style", "sound design", "what should it sound like", "dynamic music".
music-track
Use when generating a looped or cinematic music track. Loops are authored at >=30s with a marked loop point; cinematic tracks at >=60s linear. Trigger on "generate music", "make a calm track", "boss music", "title screen music", "main theme", "exploration loop", "combat track".