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 kunitoki/sonic-skills --skill audio-numerics-reviewgit clone --depth 1 https://github.com/kunitoki/sonic-skillsWrote 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/kunitoki/sonic-skills/audio-numerics-review)<a href="https://agentmods.dev/skills/kunitoki/sonic-skills/audio-numerics-review"><img src="https://agentmods.dev/badge/skills/kunitoki/sonic-skills/audio-numerics-review/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/kunitoki/sonic-skills/audio-numerics-review"><img src="https://agentmods.dev/badge/skills/kunitoki/sonic-skills/audio-numerics-review.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 | $0.00110 | $0.00821 |
| Opus 5 | $0.00055 | $0.00411 |
| Sonnet 5 | $0.00022 | $0.00164 |
| Haiku 4.5 | $0.00011 | $0.00082 |
Grade A, and why
audio-numerics-review 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 10d 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 — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Audio Numerics Review
Floating-point is not real math. IEEE 754 edge cases — denormals, NaN propagation, catastrophic cancellation, precision loss — silently produce wrong audio output without crashing. You won't find them with a debugger; you find them by knowing where to look.
Step 1 — Find numeric-critical paths
Locate every function doing floating-point or integer DSP: filter state loops, feedback delay lines, envelope followers, RMS/energy accumulators, pitch detectors, fixed-point paths (CMSIS-DSP, SIMD int16/int32), any division whose denominator may be zero.
Step 2 — Scan for violations
| Violation | Where to look | Symptom |
|---|---|---|
| Denormal floats | IIR state vars, reverb tanks, delay feedback | Sudden 100× CPU spike when signal decays |
| NaN / Inf | Divisions, sqrt, acos/asin, peak normalizers |
Silence or noise that can't be traced |
| Catastrophic cancellation | DC-blocking filters, near-Nyquist biquads, first-order diff | Noise floor jumps, loss of precision |
| Fixed-point overflow | Q15/Q31 multiply, CMSIS paths, SIMD int16 | Audible distortion / wrapping |
| Precision loss | RMS/energy sums, mixing buses, long loops | Accumulated DC offset, incorrect levels |
| FTZ/DAZ absent | prepareToPlay/stream-open — no mode setup |
Denormals hit on some hosts but not others |
For code examples and platform-specific notes see references/numerics-pitfalls.md.
Step 3 — Write the review
## Audio Numerics Review: `[file / function]`
### Verdict
[Safe | Has critical violations | Warnings only] — one sentence summary
### Critical Violations
**[Category]: [description]**
`file:line` — `offending code`
Why: one sentence on the numeric risk
Fix: concrete suggestion
### Warnings
[same format]
### What's Done Well
[guarded divisions, double accumulators, FTZ setup, etc.]
### Recommended Fixes (priority order)
1. ...
Quick fix table
| Violation | Safe alternative |
|---|---|
| Denormal in feedback | ScopedNoDenormals; FTZ+DAZ in prepareToPlay; DC-offset clamp |
| Division by zero | (denom > 1e-6f) ? num/denom : fallback |
sqrt/acos/asin unclamped |
std::sqrt(std::max(0.f, x)), std::clamp inputs |
| NaN propagating silently | assert(!std::isnan(y)) in debug; validate at entry points |
| Cancellation in coefficients | Compute coefficients in double; use numerically stable forms |
| Fixed-point overflow | Promote to wider type before multiply; __SSAT, CMSIS saturating ops |
| Precision loss in long sum | double accumulator or Kahan compensated summation |
| FTZ/DAZ absent | Set explicitly in prepareToPlay; use ScopedNoDenormals per-block |
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 10d ago First seen · 73 lines · 110 tokens per session scan A 1959446555f9
audio-numerics-review is a skill published in the GitHub repository kunitoki/sonic-skills (19 stars, last pushed 3mo ago), licensed Unlicense. It adds 110 tokens to every session and 821 once invoked, about $0.0006 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 2026-08-30.
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