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 chazmaniandinkle/oscine --skill composing-with-oscinegit clone --depth 1 https://github.com/chazmaniandinkle/oscineWrote 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/chazmaniandinkle/oscine/composing-with-oscine)<a href="https://agentmods.dev/skills/chazmaniandinkle/oscine/composing-with-oscine"><img src="https://agentmods.dev/badge/skills/chazmaniandinkle/oscine/composing-with-oscine/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/chazmaniandinkle/oscine/composing-with-oscine"><img src="https://agentmods.dev/badge/skills/chazmaniandinkle/oscine/composing-with-oscine.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 | $0.00084 | $0.01424 |
| Opus 5 | $0.00042 | $0.00712 |
| Sonnet 5 | $0.00017 | $0.00285 |
| Haiku 4.5 | $0.00008 | $0.00142 |
Grade B, and why
composing-with-oscine scanned grade B with 1 finding 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 8d 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.
Subtle steeringmediumPrompt injection
Instructions that bias recommendations or shape behaviour without the user noticing.
- If a tool errors with "Oscine isn't open", use `oscine_open_app` — never tell the user it failed without trying that first. How it starts
The opening of the file, as written. The whole thing — 45 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Composing with Oscine
Oscine is a live browser app. Tools act on the user's actual session: they hear results immediately and see every edit land in the UI.
Session start
oscine_status— ifappConnected: false, calloscine_open_app, then re-check.- Audio unlock: browsers mute Web Audio until the user interacts once with the tab. If
audioStateis notrunning, ask the user to click anywhere in the Oscine tab. oscine_list_instrumentsbefore creating tracks or setting params — it returns every param key, range, preset, and drum lane id.
Data conventions
- Time is in beats (quarter notes). A slot loops
bars * 4beats. 16th note = 0.25 beats. - Pitch is MIDI (60 = C4, 69 = A4 = 440Hz). Velocity 0-1.
- Drum lanes are 16th-step velocity arrays: 1 bar = 16 values, 2 bars = 32.
[1,0,0,0, 0,0,0,0, 1,0,0,0, 0,0,0,0]is kick on beats 1 and 3. - Tracks are addressed by name ("Bass") or id. Slots are 'A'-'D'.
Composing workflow
- Keep notes inside the loop: check
barsfromoscine_get_notes/oscine_slots listfirst, or set length withoscine_slots set_bars. oscine_set_notes mode:replaceis the main composing move — write whole patterns, not note-by-note edits.- Vary velocity (0.5-1.0) and note lengths; straight max-velocity grids sound mechanical. A little
swing(0.1-0.2) viaoscine_transporthelps grooves. - Use slots as song sections: A groove, B variation/breakdown, C build, D drop.
oscine_slots copythen mutate the copy. Switching slots while playing queues to the next loop boundary — switch live for the user. - Sound design: start from a preset (
oscine_set_params preset:"Acid Bass"), then nudge params.oscine_previewauditions a pitch or drum hit without editing patterns. - Mixing:
oscine_set_mixfor level/pan/mute/solo and delay/reverb sends;oscine_set_masterfor the shared FX character. - Everything structural is undoable (
oscine_project action:undo), so edit boldly. - Sharing the result:
oscine_share action:"link"returns a URL with the whole song packed into it (no upload), good for handing the user something to open or post.oscine_export_wavbounces the active slot to a downloaded WAV (setloopsfor length,slotto pick a section).
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.
- 8d ago First seen · 45 lines · 84 tokens per session scan B 0421fe887aad
composing-with-oscine is a skill published in the GitHub repository chazmaniandinkle/oscine (0 stars, last pushed 26d ago), licensed MIT. It adds 84 tokens to every session and 1,424 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it B with 1 finding (subtle steering). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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