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 circle-of-fifthsgit 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/circle-of-fifths)<a href="https://agentmods.dev/skills/guitaralchemist/ga/circle-of-fifths"><img src="https://agentmods.dev/badge/skills/guitaralchemist/ga/circle-of-fifths/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/circle-of-fifths"><img src="https://agentmods.dev/badge/skills/guitaralchemist/ga/circle-of-fifths.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 | $0.00078 | $0.01376 |
| Opus 5 | $0.00039 | $0.00688 |
| Sonnet 5 | $0.00016 | $0.00275 |
| Haiku 4.5 | $0.00008 | $0.00138 |
Grade A, and why
circle-of-fifths 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 — 120 lines — stays where its author put it; the contents beside it link to each section on GitHub.
The Circle of Fifths
Reproduce the catalog below verbatim when a user asks about the circle of fifths. Pure pedagogy — the layout is fixed and doesn't need a tool call.
What it is
Twelve major keys arranged so each step clockwise is a perfect fifth up (and each step counter-clockwise is a perfect fourth up, equivalently a perfect fifth down). Adjacent keys differ by exactly one accidental in their key signature.
Clockwise (sharps): adding sharps
Start at C (no sharps), each clockwise step adds one sharp:
| Position | Key | Key Signature |
|---|---|---|
| 12 (top) | C major | (none) |
| 1 | G major | F# |
| 2 | D major | F# C# |
| 3 | A major | F# C# G# |
| 4 | E major | F# C# G# D# |
| 5 | B major | F# C# G# D# A# |
| 6 | F# major | F# C# G# D# A# E# |
| 7 | C# major | F# C# G# D# A# E# B# (all 7 sharps) |
Order of added sharps: F – C – G – D – A – E – B (mnemonic: Father Charles Goes Down And Ends Battle).
Counter-clockwise (flats): adding flats
From C counter-clockwise, each step adds one flat:
| Position | Key | Key Signature |
|---|---|---|
| 11 | F major | Bb |
| 10 | Bb major | Bb Eb |
| 9 | Eb major | Bb Eb Ab |
| 8 | Ab major | Bb Eb Ab Db |
| 7 | Db major | Bb Eb Ab Db Gb |
| 6 | Gb major | Bb Eb Ab Db Gb Cb |
| 5 (≡ C# major) | Cb major | Bb Eb Ab Db Gb Cb Fb (all 7 flats) |
Order of added flats: B – E – A – D – G – C – F (mnemonic: Battle Ends And Down Goes Charles' Father — reverse of the sharps order).
Each major key's relative minor (inner circle)
Each major key shares its key signature with its relative minor — three semitones down (or a minor third), same notes:
Sharp side:
- C major ↔ A minor
- G major ↔ E minor
- D major ↔ B minor
- A major ↔ F# minor
- E major ↔ C# minor
- B major ↔ G# minor
- F# major ↔ D# minor
- C# major ↔ A# minor
Flat side:
- F major ↔ D minor
- Bb major ↔ G minor
- Eb major ↔ C minor
- Ab major ↔ F minor
- Db major ↔ Bb minor
- Gb major ↔ Eb minor
- Cb major ↔ Ab minor
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 · 120 lines · 78 tokens per session scan A 31c2ac5b381a
circle-of-fifths is a skill published in the GitHub repository GuitarAlchemist/ga (2 stars, last pushed today), licensed MIT. It adds 78 tokens to every session and 1,376 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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