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 music-theory-validatorgit 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/music-theory-validator)<a href="https://agentmods.dev/skills/guitaralchemist/ga/music-theory-validator"><img src="https://agentmods.dev/badge/skills/guitaralchemist/ga/music-theory-validator/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/music-theory-validator"><img src="https://agentmods.dev/badge/skills/guitaralchemist/ga/music-theory-validator.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 | $0.00038 | $0.00582 |
| Opus 5 | $0.00019 | $0.00291 |
| Sonnet 5 | $0.00008 | $0.00116 |
| Haiku 4.5 | $0.00004 | $0.00058 |
Grade A, and why
Music Theory Validator 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 12d 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.
What it actually says
Music Theory Validator
This skill provides the logical constraints and musical axioms for the Guitar Alchemist domain. Use this when implementing new musical objects or validating generated content.
1. Core Musical Axioms
- Octave Equivalence: All pitch classes are calculated modulo 12.
- Minimal Chord: A chord MUST have at least 2 notes (dyad), though 3+ is the standard for triads.
- Root Prominence: A chord always has a
Rootwhich defines its identity and formula.
2. Chord Quality Rules
The following semitone offsets from the root define triad qualities:
| Quality | Interval 1 (Semitones) | Interval 2 (Semitones) |
|---|---|---|
| Major | 4 (Major 3rd) | 7 (Perfect 5th) |
| Minor | 3 (Minor 3rd) | 7 (Perfect 5th) |
| Diminished | 3 (Minor 3rd) | 6 (Diminished 5th) |
| Augmented | 4 (Major 3rd) | 8 (Augmented 5th) |
3. Extension Logic
Extensions depend on the presence of specific interval classes:
- 7th: Requires semitone 10 (m7) or 11 (M7).
- 9th: Requires semitone 2 (or 14).
- 11th: Requires semitone 5 (or 17).
- 13th: Requires semitone 9 (or 21).
4. Scale Validation
- A scale is defined by its
PitchClassSet. - Common scales like Prometheus (0, 2, 4, 6, 9, 10) or Diatonic (7 notes) have fixed interval patterns.
- Always check consistency via
IntervalClassVector.
5. Domain Invariants
A chord must have a root note and a pitch class set.PitchClassSetis a tonal realization of the notes.- Inversion indices start at 0 (Root Position).
6. Verification Steps for AntiGravity
Before committing a new musical definition:
- Calculate the semitone array.
- Match against the quality rules in Section 2.
- Check the
Symbolgeneration logic to ensure it matchesGenerateSymbol()inChord.cs.
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.
- 12d ago First seen · 47 lines · 38 tokens per session scan A a13615833fbd
Music Theory Validator is a skill published in the GitHub repository GuitarAlchemist/ga (2 stars, last pushed today), licensed MIT. It adds 38 tokens to every session and 582 once invoked, about $0.0002 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.
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