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 GuitarAlchemist/ga --skill transposegit clone --depth 1 https://github.com/GuitarAlchemist/gaWrote 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/guitaralchemist/ga/transpose)<a href="https://agentmods.dev/skills/guitaralchemist/ga/transpose"><img src="https://agentmods.dev/badge/skills/guitaralchemist/ga/transpose/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/guitaralchemist/ga/transpose"><img src="https://agentmods.dev/badge/skills/guitaralchemist/ga/transpose.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 | $0.00077 | $0.01564 |
| Opus 5 | $0.00039 | $0.00782 |
| Sonnet 5 | $0.00015 | $0.00313 |
| Haiku 4.5 | $0.00008 | $0.00156 |
Grade A, and why
transpose 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 9d 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 — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Transpose a Chord
When a user asks to transpose a chord by an interval (or to move it into a different key), call ga_dsl_eval with closure name domain.transposeChord. Do NOT compute the transposition mentally — for less-common keys (Gb major, C# minor) the LLM will confidently flip enharmonics and produce wrong spellings.
Why this skill uses ga_dsl_eval (not a keyhole tool)
This is the first canary for the DSL-eval pattern. Instead of one MCP tool per gap, we call the existing domain.transposeChord closure through the universal ga_dsl_eval entry point. The closure is registered in GaClosureRegistry and exposed only because its category is Domain (per docs/contracts/2026-05-06-ga-dsl-eval-contract.md v0.1).
Calling the tool
Method: ga_dsl_eval
Args (flat key-value, all values as strings):
closureName="domain.transposeChord"args.symbol— the chord symbol, e.g."Cmaj7","F#m","Bb7".args.semitones— integer string. Positive = up, negative = down. Convert from interval names using the table below.
Example invocation:
ga_dsl_eval(closureName: "domain.transposeChord",
args: { "symbol": "Cmaj7", "semitones": "5" })
Returns a DslEvalResult. Read Result for the new chord symbol (e.g. "Fmaj7"); on failure, read Error.Code and Error.Message.
Interval → semitones table
Use this to convert the user's phrasing into the semitones arg. Direction "up" = positive; "down" = negative.
| Interval | Semitones | Common phrasings |
|---|---|---|
| unison / P1 | 0 | "no change", "same root" |
| minor 2nd / m2 / half step | 1 | "up a half step", "by a semitone" |
| major 2nd / M2 / whole step | 2 | "up a whole step", "by two semitones" |
| minor 3rd / m3 | 3 | "up a minor third", "by three semitones" |
| major 3rd / M3 | 4 | "up a major third" |
| perfect 4th / P4 | 5 | "up a perfect fourth", "by a fourth" |
| tritone / TT / dim 5 / aug 4 | 6 | "by a tritone" |
| perfect 5th / P5 | 7 | "up a perfect fifth", "by a fifth" |
| minor 6th / m6 | 8 | "up a minor sixth" |
| major 6th / M6 | 9 | "up a major sixth" |
| minor 7th / m7 | 10 | "up a minor seventh" |
| major 7th / M7 | 11 | "up a major seventh" |
| octave / P8 | 12 | "up an octave" |
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.
- 9d ago First seen · 111 lines · 77 tokens per session scan A e4c661255b95
transpose is a skill published in the GitHub repository GuitarAlchemist/ga (2 stars, last pushed today), licensed MIT. It adds 77 tokens to every session and 1,564 once invoked, about $0.0004 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 2026-09-03.
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